JP4619933B2 - Paging method - Google Patents

Description

  The present invention relates to a paging method and a location registration method used in a communication network, and in particular, a paging method for transmitting a paging request message to a mobile device existing in a specific location registration area in the communication network. , And a location registration method that is executed as the mobile device moves.

  In recent years, in so-called third generation (3G) cellular systems, it has become possible to relatively easily perform not only voice communication but also non-voice data communication such as Internet communication and transmission / reception of electronic mail. Yes. In the future, more people will communicate using the cellular system, and traffic is expected to increase.

  Therefore, the standardization study of the technical specifications that realize the traffic reduction of the cellular system and the high speed / large capacity of data transmission is underway. As the technical specifications that realize such a traffic reduction, for example, the following non-patent documents 1 and 2 are present.

  According to the following Non-Patent Document 1, a paging request message is transmitted to a mobile device (UE: User Equipment) existing in a specific location registration area including a plurality of base stations forming a network (cellular system) (paging). The core network (CN) transmits a paging request message to a radio network controller (RNC) that forms a location registration area in which the mobile device exists. Then, the RNC transmits the paging request message received from the core network to the mobile communication terminal via all the radio base stations forming the location registration area.

  According to Non-Patent Document 2, the communication network dynamically reduces the size of the location registration area, thereby reducing signal traffic during location registration. Also, when paging a mobile device, the location registration area is divided into smaller areas, and the traffic used for paging request signal (message) transmission is obtained by sequentially calling each divided area. Reduce.

3GPP Technical Report `` UTRAN functions, examples, on signaling procedures '' TR 25.931, v6.2.0, p.22, Figure 5, June 2005 The Institute of Electronics, Information and Communication Engineers, IEICE Technical Report "A Study on Adaptive Location Registration Control Method for Mobile Communications" RCS2001-314, p.15-22, March 2002

  However, in order to reduce the connection delay caused by transmitting the paging request message via the RNC, when the network in which the RNC is excluded from the conventional system is constructed, the core network forms all the location registration areas. There is a need to individually distribute a paging request message to each wireless base station. For this reason, there is a problem that the processing load on the core network side at the time of transmitting the paging request message becomes large. In addition, there is a problem that connection delay occurs when the above sequential calls are performed.

  Furthermore, although it has been shown that the location registration area is dynamically changed, how to efficiently transfer the paging signal to the location registration area that changes dynamically is a method. There was a problem that it was not shown.

  The present invention has been made in view of the above, and an object of the present invention is to realize a paging method that reduces a processing load when a device corresponding to a subscriber node of the core network transmits a paging signal.

  It is another object of the present invention to realize a paging method that efficiently transfers a paging request message to a dynamically changing location registration area and reduces connection delay after paging.

  It is another object of the present invention to obtain a location registration method for registering information necessary for executing the paging method to a network.

  In order to solve the above-described problems and achieve the object, a paging method according to the present invention is a paging method when a paging request message is transmitted to a mobile device, in which a subscriber node is assigned to a specific mobile device. A base station that receives a paging request message addressed to the mobile device from a plurality of base stations forming a camping location registration area and forwards the paging request message to another base station in the location registration area (Destination base station), a base station search step for searching, a message transmission step in which the subscriber node transmits a paging request message addressed to the mobile device to the destination base station, and the destination base The received paging request message is received so that the station reaches all the base stations forming the location registration area. It characterized in that it comprises a message transfer step of transferring over di-, the.

  According to the present invention, it is possible to reduce the processing load on the subscriber node when transmitting a paging request.

  Hereinafter, embodiments of a paging method and a location registration method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a configuration example of a first embodiment of a communication system including a communication network that implements a paging method and a location registration method according to the present invention. This communication system includes a mobile network 61 forming a communication network for realizing the paging method and location registration method according to the present invention, location registration areas (radio access networks) 51 to 55, and a gateway node serving as a gateway between the communication networks. 41 and 42, mobile devices 11 and 12, and a communication network 71 connected to the mobile network 61 via gateway nodes 41 and 42. Note that the communication network 71 is formed of, for example, a radio access network and a mobile network, and is provided by an operator different from the operator that provides the mobile network 61 and the location registration areas 51 to 55.

  The mobile network 61 includes subscriber nodes 31 to 33 for controlling a plurality of identical or different radio access networks (location registration areas), tracking and exchanging a plurality of mobile devices, session management, and the like. Further, the location registration areas 51 to 55 include radio base stations (hereinafter referred to as base stations), and indicate areas in which, when an incoming call to a mobile device occurs, the mobile device performs simultaneous calling (simultaneous paging). In the present embodiment, base stations 21 to 29 form location registration areas 51 to 55. Each base station is connected to a surrounding base station (not limited to a base station in the same location registration area) by a control signal transmission path. In addition, the mobile device performs location registration when detecting a periodic or area change in the standby state.

  Hereinafter, the operation (paging method) when an incoming call addressed to the mobile device 11 occurs will be described with reference to FIGS. FIG. 2 is a sequence diagram illustrating an example of the paging method according to the first embodiment. Further, the mobile device 11 completes location registration in the location registration area 51 whose location registration area identifier (location registration area ID) is “01 00 00 00”, and the base station 22 forming the location registration area 51 Assume that you are located (camped).

  The gateway node 41 of the mobile network 61 describes a session initialization request message (hereinafter referred to as “session initialization request message”) for application communication such as VoIP (Voice over Internet Protocol) addressed to the mobile device 11. Is received), a routing destination is searched according to the management information of the location registration area registered by each mobile device (step S101). Then, the gateway node 41 transfers the received session initialization request message to the subscriber node 32 that is the location registration destination of the mobile device 11 (step S102). When the subscriber node 32 receives the session initialization request message, the subscriber node 32 searches for a location registration area in which the mobile device 11 is registered (step S103). Next, the subscriber node 32 searches for a base station that is a starting point for transferring a paging request message in the location registration area 51 that is the search result of step S103 (step S104). Then, the subscriber node 32 transmits a paging request message to the base station 23 that is the search result of Step S104 (Step S105).

  The base station 23 that has received the paging request message so that the received paging request message reaches all the base stations in the location registration area (location registration area 51) where the own station exists (so as to be distributed). Then, the message is transferred through the control signal transmission line (step S106). This transfer procedure uses a method in which messages are efficiently distributed according to the configuration of the communication network. For example, base station 23 forwards a paging request message to neighboring base stations 22 and 24, and base stations 22 and 24 forward the received message to neighboring base stations 21 and 25, respectively. . Then, the base stations 21 to 25 that have received the paging request message perform paging according to the procedure defined by the wireless interface (step S107). In the example shown in FIG. 2, the base station 23 that is the starting point first transfers the message to two base stations. However, the message is not limited to this and is transferred to three or more base stations. Also good. Further, the base station that has received the message transferred from the starting base station may further transfer the message to a plurality of base stations.

  The mobile station 11 that has received the paging request message under the control of the base station 22 (via the base station 22) transmits a paging response message (Paging Response) to the subscriber node 32 via the base station 22 (step S108). ). The subscriber node 32 that has received the paging response message executes authentication processing of the mobile device 11 as necessary (step S109), and then forwards the session initialization request message received in step S102 to the mobile device 11 (step S109). Step S110). Upon receiving the session initialization request message, the mobile device 11 sends an initialization response (Session Initiation Response) message to the subscriber node 32 via the base station 22 in order to start a session for application communication such as VoIP. Transmit (step S111).

  The subscriber node 32 transfers the session initialization request message received from the mobile device 11 via the base station 22 to the gateway node 41. When the gateway node 41 returns the received session initialization request message to the transmission source of the session initialization request message received in step S101, the session is established end-to-end (step S112). When the subscriber node 32 receives the session initialization request message in step S111, the subscriber node 32 sets a radio access bearer for application communication such as VoIP communication with the mobile station 11 via the base station 22 (step S111). S113).

  In the present embodiment, one base station that is the starting point of the transfer of the paging request message is selected from the same location registration area. However, the present invention is not limited to this, depending on the size of the location registration area, etc. A plurality of base stations may be selected as starting points, and a subscriber node may transmit a paging request message to these base stations.

  Thus, in the present embodiment, among the plurality of base stations forming the location registration area, the base station selected as the starting point when distributing the paging request message to the base stations in the location registration area, The paging request message transmitted from the subscriber node of the mobile network is directly received, and the message is transferred to other base stations forming the location registration area. As a result, the processing of the subscriber node transmitting the paging request message to all base stations is reduced, and the processing load on the subscriber node when transmitting the paging request can be reduced.

Embodiment 2. FIG.
Next, the second embodiment will be described. The configuration of the communication system of the present embodiment is the same as that of the communication system of the first embodiment described above. In the present embodiment, the operation of a subscriber node when a system failure occurs in a base station selected as a starting point for transferring a paging request message will be described.

  FIG. 3 is a sequence diagram showing an operation example of the subscriber node when a system failure occurs in the base station that is the starting point for transferring the paging request message. Here, it is assumed that the base station 23 is the starting point for transferring the paging request message, and the operation of the subscriber node when a system failure occurs in the base station 23 will be described with reference to FIGS.

  When the periodic wake-up timer times out, the subscriber node 32 sends a health check request for confirming whether the base station 23 is operating normally to the base station 23 selected as the starting point of the paging request message transfer. Transmit (step S201). Then, the subscriber node 32 wakes up a response waiting timer for the health check request (step S202). When the normal operation is performed, the base station 23 transmits a health check response to the subscriber node 32 (step S203). Then, the subscriber node 32 that has received the health check response stops the response waiting timer and wakes up a timer for periodically transmitting the health check request. Thereafter, the subscriber node 32 periodically performs a health check (corresponding to steps S201 to 203) with the base station 23.

Thereafter, when a system failure occurs in the base station 23, the subscriber node 32 wakes up a response waiting timer for the health check request after transmitting the health check request (step S204). If the health check response from the base station 23 cannot be received before the response wait timer corresponding to the health check request times out, the subscriber node 32 retransmits the health check request to the base station 23 N _R max times. (N _R max is a system constant of the subscriber node 32). Then, the subscriber node 32 determines that a system failure has occurred in the base station 23 when the health check response from the base station 23 cannot be received even though the health check request has been retransmitted N _R max times. Then, the starting point of the transfer of the paging request message is changed to the base station 22 (step S206).

  Thereafter, the subscriber node 32 performs the same operation as that of the first embodiment described above with the base station 22 that is the starting point of transfer of the changed paging request message. Specifically, when a session initialization request message addressed to the mobile device 11 is received from the gateway node 41, a paging request message is transmitted to the base station 22. Then, the base station 22 transfers the received paging request message to the base stations in the same location registration area. Thereafter, the same processing as in the first embodiment described above is executed.

  As described above, in the present embodiment, when a system failure occurrence of a base station selected as a starting point for transferring a paging request message is periodically monitored and the occurrence of the system failure is detected, the subscriber node The base station that is the starting point for message transfer is selected again, and thereafter, a paging request message is transmitted to the selected base station. As a result, the processing load on the subscriber node when transmitting the paging request message can be reduced, and paging can be performed even when a system failure occurs in the base station that is the starting point for transferring the paging request message.

Embodiment 3 FIG.
Next, Embodiment 3 will be described. The configuration of the communication system of the present embodiment is the same as that of the communication system of the first embodiment described above. In the present embodiment, the base station that is the starting point for the transfer of the paging request message transfers the received paging request message and performs the paging of the mobile device (the operation corresponding to step S106 in the first embodiment described above). ).

  FIG. 4 is a sequence diagram illustrating an operation example in which base stations included in the same location registration area transfer a paging request message. FIG. 5 is a diagram illustrating a configuration example of a paging request message transmitted from the subscriber node to the base station. In FIG. 5, CRC (Cyclic Redundancy Check) is a checksum for examining the header part (Header) of a message. FT (Frame Type) indicates a message type, and is “1” (fixed) in the case of a paging request message. CFN (Connection Frame Number) indicates the timing at which the base station transmits a paging request message addressed to the mobile device stored in Payload 2 to the radio interface. PI (Paging Indicator) indicates presence / absence of payload 1 (Payload 1 (PI-Bitmap area)) (0: none, 1: presence) TFI (Transport Format Indicator) indicates presence / absence of payload 2 (Payload 2) (0 : No, 1: Yes) The hop limit is information for determining whether or not to transfer the received message to another base station. If “1” is subtracted from the set hop limit and the subtraction result is “0”, no message is transferred, and the payload 2 contains a paging request (Paging Request) for the mobile device that performs paging. In addition, when paging requests for a plurality of mobile devices existing in the same location registration area overlap, the paging requests for the plurality of mobile devices are combined into one paging request message. It is possible to transmit the constant to. Therefore, the area for storing information indicating the number of paging request that has been set in the payload 2 (multiplex number) is provided.

  Hereinafter, an operation in which the base station transfers the received paging request message and performs paging of the mobile device will be described with reference to FIG. 1 and FIG. Here, an operation when paging is performed on the mobile device 11 camping in the location registration area 51 will be described. In the location registration area 51, it is assumed that the base station 23 is the starting point for transferring the paging request message.

  When the subscriber node 32 receives a session initialization request message addressed to the mobile device 11 from the gateway node 41, the subscriber node 32 searches for a location registration area in which the mobile device 11 is registered (step S301). Next, the subscriber node 32 searches the location registration area 51, which is the search result of step S101, the base station that is the starting point of the transfer of the paging request message and the hop limit set in the paging request message (Hop Limit) ( Step S302). Then, the subscriber node 32 transmits a paging request message in which the hop limit which is the search result of step S302 is set to the base station 23 which is the search result of step S302 (step S303).

  Depending on the network configuration, etc., the hop limit may be used in multiple ways, such as the hop limit used when transferring messages in the first direction and the hop limit used when transferring messages in the second direction. Good. As a result, the subscriber node can individually specify the hop limit for each transfer direction when the base station that is the starting point for message transfer transfers messages in multiple directions. The message can be prevented from being transferred. In this example, it is assumed that a hop limit for two directions is used, and a base station that is a starting point for message transfer transfers a message to two adjacent base stations.

  The base station 23 that has received the paging request message from the subscriber node 32 subtracts “1” from the hop limit set in the message (step S304), and is the hop limit after execution of the subtraction process “0”? It is determined whether or not (step S305). When the hop limit after execution of the subtraction process is not “0” (step S305, No), the base station 23 sends the received paging request message to the adjacent base stations 22 and 24 via the control signal transmission path. Forward. If the hop limit after execution of the subtraction process is “0” (step S305, Yes), the base station 23 does not transfer the received paging request message.

  Similarly, the base stations 22 and 24 that have received the paging request message from the base station 23 subtract “1” from the hop limit set in the received message (steps S306 and S307). Next, the base stations 22 and 24 determine whether or not the hop limit after execution of the subtraction process is “0” (steps S308 and S309). When the hop limit after execution of the subtraction process is not “0” (No at Step S308, Step S309, No), the base stations 22 and 24 transfer the received paging request messages to the adjacent base stations 21 and 25, respectively. To do. If the hop limit after execution of the subtraction process is “0” (Yes at Step S308, Yes at Step S309), the base stations 22 and 24 do not transfer the received paging request message.

  Further, the base stations 21 and 25 that have received the paging request message subtract “1” from the hop limit set in each received message (steps S310 and S311). Next, the base stations 21 and 25 determine whether or not the hop limit after execution of the subtraction process is “0” (steps S308 and S309), and when the hop limit after execution of the subtraction process is “0”, The received paging request message is not transferred (step S308, Yes, step S309, Yes).

  Note that, in the same way as the above-described subscriber node of the second embodiment, the subscriber node of the present embodiment selects the base station that is the starting point when a failure occurs in the base station that is the starting point of the paging request message transfer. It may be reselected.

  Thus, in this embodiment, a hop limit is provided in the information element of the paging request message, and the subscriber node of the mobile network transfers the paging request message to a plurality of base stations in the same location registration area. The paging request message in which the hop limit is set is transmitted to the base station that is the starting point of the transfer, and the base station that has received the paging request message, based on the hop limit set in the paging request message, It was decided to determine whether or not to forward the paging request message. As a result, the processing load on the subscriber node when transmitting the paging request can be reduced, and the paging request message can be easily distributed to a predetermined location registration area.

Embodiment 4 FIG.
Next, the fourth embodiment will be described. The configuration of the communication system of the present embodiment is the same as that of the communication system of the first embodiment described above. In the present embodiment, a mobile device that detects a change in its own moving speed selects a location registration area for camping based on the detection result, and performs location registration for the selected area (location registration). The operation of the subscriber node to obtain information on the mobile device that is requesting is described.

Hereinafter, the operation in which the mobile device 11 performs location registration with respect to the subscriber node 32 will be described with reference to FIG. 1, FIG. 6, and FIG. FIG. 6 is a sequence diagram illustrating an example of the location registration method according to the fourth embodiment. FIG. 7 is a diagram illustrating a configuration example of a location registration area for realizing the location registration method according to the fourth embodiment. In FIG. 7, the location registration area of the lowest hierarchy (tier 1) is configured in units of cells or sectors of one base station, and the location registration area of the widest hierarchy (tier 4) is , A configuration in which eight lowermost layers are combined. In the present embodiment, the number of location registration areas in each layer is 2 ^N (N = 3, 2, 1, 0) from the lowest level, but N (subtracts “1” from the number of layers). And the relationship between each layer (in this embodiment, the number of lower and upper areas is uniformly 2: 1 between each layer) is the number of users accommodated (number of mobile devices) Set in consideration of various conditions such as the number of base stations. In addition, in FIG. 7, the part described as “xx” in the numerical value indicating the example of the location registration area ID of the hierarchy 2 to 4 is handled by masking the part (referred to as Don't Care). Is shown. Therefore, the location registration area of the upper hierarchy is formed by combining a plurality of location registration areas of the hierarchy 1 that share a part of the location registration area ID.

  In the standby state, the mobile device 11 monitors, for example, whether or not its own moving speed has changed by monitoring the speed sensor at a constant cycle (step S401, step S402, No). When a change in speed is detected (step S402, Yes), the mobile device 11 determines increase / decrease in speed (step S403). If it is determined that the speed has increased (step S403, Yes), the mobile device 11 selects a location registration area in a higher hierarchy than the currently selected location registration area (step S404). On the other hand, when it is determined that the speed has decreased (No in step S403), the mobile device 11 selects a position registration area in a lower hierarchy than the currently selected position registration area (step S405). Next, the mobile device 11 uses the location registration area ID (uses the ID of the lowest hierarchy, which is the lowest hierarchy, regardless of the selected hierarchy) and information on the hierarchy of the location registration area selected in step S404 or S405 above ( A location registration update request (Routing Area Update Request) message (a location registration update request message in which information related to the reselected location registration area is set) is transmitted to the subscriber node 32. (Step S406). The location registration update request message includes the identifier (ID) of the subscriber node that manages the location registration area in which the mobile device 11 has been registered.

  The subscriber node 32 determines the location registration area ID based on the location registration area ID set in the received location registration update request message (tier 1 ID which is the lowest layer) and layer information (layer identifier). A part is masked, and the ID of the location registration area selected by the mobile device 11 is extracted. Next, the subscriber node 32 updates a database that manages information related to the location registration area where the mobile device 11 camps based on the extracted ID (step S407). Next, the subscriber node 32 requests that the message received from the mobile device 11 be a new registration or update based on the contents of a database that manages information related to the location registration area where the mobile device 11 camps. One of them is determined (step S408). When the mobile device 11 requests a new registration (step S408, Yes), the subscriber node 32 receives context information about the mobile device 11 from the old subscriber node from which the mobile device 11 has moved (temporarily sent to the mobile device 11). The identifier of the allocated mobile device is acquired (step S409). Then, a location update (Update Location) message is transmitted to the gateway node 41 (step S410).

  When receiving the location update message, the gateway node 41 requests the old subscriber node that is the source of the mobile device 11 to delete the location registration information (step S411). Next, the gateway node 41 transmits a subscriber information registration (Insert Subscriber Data) message to notify the subscriber node 32 of the subscriber information of the mobile device 11 (step S412). When the subscriber node 32 acquires the subscriber information of the mobile device 11 from the gateway node 41 (step S413), the subscriber node 32 transmits a response (Insert Subscriber Data Acknowledge) message to the gateway node 41 (step S414).

  When receiving the response message, the gateway node 41 transmits a response (Update Location Acknowledge) message to the subscriber node 32 in response to the location update message received in step S410 (step S415). The subscriber node 32 transmits a location registration update acceptance message (Routing Area Update Accept) in which the identifier of the mobile device is set to the mobile device 11 via the base station 23 in order to update the identifier of the mobile device to be temporarily assigned. (Step S416). Then, when the mobile device 11 transmits a completion message (Routing Area Accept Complete) to the location update acceptance message to the subscriber node 32 via the base station 23 (step S417), the location registration area update operation is completed. Note that the subscriber node 32 executes steps S416 and S417 when it is determined in step S407 that the mobile device 11 does not request new registration (step S408, No). Thereafter, when the subscriber node 32 performs paging for the mobile device 11, the paging request message is distributed to the reselected location registration area using the paging method of the first or third embodiment. To do.

  Note that, in the same way as the above-described subscriber node of the second embodiment, the subscriber node of the present embodiment selects the base station that is the starting point when a failure occurs in the base station that is the starting point of the paging request message transfer. It may be reselected.

  As described above, in the present embodiment, the mobile station selects a hierarchical location registration area based on its own moving speed, and information about the identifier of the selected location registration area and the location registration area hierarchy ( The location registration update request message in which the hierarchy identifier) is set is transmitted to the subscriber node via the base station, and the subscriber node is based on the location registration area identifier and the information on the hierarchy set in the location registration update request message. Thus, the location registration area in which the mobile device performs location registration is selected. Thereby, it is possible to suppress an increase in the number of executions of location registration as the mobile device moves, and to reduce the amount of signal used for the location registration update process.

  Further, the location registration area constitutes a location registration area that is hierarchized for each base station or sector in which a part of the identifier of the location registration area is common. Thereby, the location registration area can be easily hierarchized.

Embodiment 5 FIG.
Next, the fifth embodiment will be described. The configuration of the communication system of the present embodiment is the same as that of the communication system of the first embodiment described above. In this embodiment, a position registration operation that is periodically executed, a position registration operation that is executed in accordance with a change in geographical conditions, and a change in movement speed (a change in hierarchical location registration area) is executed. The mutual relationship of the location registration operation (the location registration operation of the fourth embodiment described above) will be described based on FIG. 1 and FIG. FIG. 8 is a flowchart illustrating an operation example of the mobile device 11 that executes the location registration method according to the fifth embodiment. Further, the mobile device 11 performs location registration with respect to the subscriber node 32.

  When the mobile device 11 is waiting (step S501) and receives a time-out notification of a timer for notifying the timing of monitoring its own speed (step S502), it acquires its own speed information (step S503). Then, the mobile device 11 compares the speed information acquired in step S503 with the history of speed information acquired before that time, and determines whether there is a speed change (step S504). If it is determined in step S504 that there is no speed change (No in step S505), the mobile device 11 is on standby without changing the state (step S513).

  On the other hand, when it is determined in step S504 that there is a speed change (step S505, Yes), the mobile device 11 selects a hierarchical location registration area based on the speed information acquired in step S503. Then, “update location registration area” is selected as the location registration update reason set in the location registration update request message (step S506). Next, the mobile station 11 assembles a location registration update request message including the ID of the location registration area selected in step S506 and the reason for updating (update of the location registration area), and sends it to the subscriber node 32 via the base station 23. Transmit (step S515). Then, the mobile device 11 transitions to a location registration updating state (step S516) and waits for a response (Routing Area Update Accept) message to be transmitted from the subscriber node 32 via the base station 23. The details of the location registration operation shown in steps S502 to S504, S505, Yes, S506, S515, and S516 are the same as the location registration operation of the fourth embodiment described above.

  In addition, when receiving the notification information reception (step S507) while waiting (step S501), the mobile device 11 acquires the identifier of the location registration area from the notification information received (step S508), and registers the location. It is determined whether or not there is an area change (step S509). If it is determined that there is no change in the location registration area (No in step S509), the mobile device 11 is on standby without changing the state (step S513). On the other hand, when it is determined that the location registration area has changed (step S509, Yes), the mobile device 11 selects “update location registration area” as the location registration update reason set in the location registration update request message. (Step S510). The mobile device 11 then sends a location registration update request message (a location where information related to a new location registration area is set) including the reason for the update (update of the location registration area) and the identifier (ID) of the location registration area acquired in step S508. Registration update request message) is assembled and transmitted to the subscriber node 32 via the base station 23 (step S515). Then, the mobile device 11 transitions to a location registration updating state (step S516) and waits for a response message transmitted from the subscriber node 32 via the base station 23.

  In addition, when the mobile device 11 is waiting (step S501) and receives a time-out notification of a timer for notifying the timing for transmitting a periodic location registration update request message (step S511), the location registration update request message “Periodic update” is selected as the location registration update reason to be set to (step S512). Next, the mobile device 11 receives a location registration update request message (location registration update with information on the current location registration area) including the reason for the update and the ID of the location registration area (location registration area during camping) that has not changed. Request message) is assembled and transmitted to the subscriber node 32 via the base station 23 (step S515). Then, the mobile device 11 transitions to a location registration updating state (step S516) and waits for a response message transmitted from the subscriber node 32 via the base station 23.

  After the location registration is completed, when the subscriber node 32 performs paging on the mobile device 11, the subscriber node 32 performs paging on the re-selected location registration area using the above-described paging method of the first or third embodiment. Distribute the request message.

  Note that, in the same way as the above-described subscriber node of the second embodiment, the subscriber node of the present embodiment selects the base station that is the starting point when a failure occurs in the base station that is the starting point of the paging request message transfer. It may be reselected.

  As described above, in this embodiment, the mobile network joins both in the periodic and geographical location registration area changes and in the hierarchical location registration area change based on the moving speed. The location registration update request message is transmitted to the person node. As a result, the mobile device updates the hierarchical location registration area according to the present invention without affecting the location registration operation associated with the change in the periodic and geographical location registration area, which is a conventional location registration execution condition. The location registration is executed following the above, and the subscriber node can manage the location in the standby state.

Embodiment 6 FIG.
Next, the sixth embodiment will be described. The configuration of the communication system of the present embodiment is the same as that of the communication system of the first embodiment described above. In the present embodiment, the mobile station that has been notified from the base station of information regarding the number of hierarchized location registration areas from the base station performs location registration based on the notified information (reselecting the location registration area) The operation of registering the position of the reselected area) will be described with reference to FIGS. FIG. 9 is a sequence diagram illustrating an operation example in which the base station according to the sixth embodiment notifies the mobile device of information related to the number of layers in the location registration area. The operation example which notifies the information regarding a location registration area is shown.

  The subscriber node 32 includes an information element including information on the number of hierarchized location registration areas (information on the number of hierarchies of location registration areas that can be selected by the mobile device, hereinafter referred to as hierarchy number information). A system information update request message in which is set is transmitted to the base station 23 (step S601). The base station 23 that has received the broadcast information update request message transmits a response (System Information Update Response) message to the subscriber node 32 (step S602). Further, the base station 23 stores the information element set in the broadcast information update request message (step S603). Next, the base station 23 assembles broadcast information (System Information) including the information elements (including hierarchy number information) stored in Step S603, and determines scheduling (Step S604). Then, the base station 23 periodically transmits the broadcast information using the broadcast channel on the radio interface according to the scheduling determined in step 604 (step S605).

  Note that transmission of broadcast information needs to be performed by all base stations. Therefore, when there are base stations that are managed and controlled in addition to the base station 23, the subscriber node 32 transmits the notification information update request to the base station 23 described above (steps described above). The operation similar to S601 and S602) is performed, and a broadcast information update request is transmitted. Then, the base station that has received the broadcast information update request periodically transmits broadcast information included in the broadcast information update request according to scheduling.

  When receiving the broadcast information from the base station 23 (step S606), the mobile device 11 acquires the number of layers information included in the broadcast information (step S607). Thereafter, when the mobile device 11 detects a change in the moving speed and changes (reselects) the hierarchical location registration area, the number of layers information acquired in step S607 and the state of the change in its own moving speed are detected. An appropriate location registration area is selected based on the above. Note that the operation of selecting a hierarchical location registration area is the same as that in the above-described fourth embodiment, and thus description thereof is omitted here. When the position registration area is reselected, the mobile device 11 performs the same operation as that of the above-described fourth embodiment, and performs position registration for the reselected position registration area.

  After the location registration is completed, when the subscriber node 32 performs paging on the mobile device 11, the subscriber node 32 performs paging on the re-selected location registration area using the above-described paging method of the first or third embodiment. Distribute the request message.

  Note that, in the same way as the above-described subscriber node of the second embodiment, the subscriber node of the present embodiment selects the base station that is the starting point when a failure occurs in the base station that is the starting point of the paging request message transfer. It may be reselected.

  Thus, in this embodiment, the base station periodically transmits broadcast information in which information related to the number of layers in the location registration area that can be selected by the mobile device (layer number information) is set. , When a change in the moving speed is detected, based on the number-of-layers information set in the broadcast information, re-select the hierarchical location registration area and send a location registration update request message to the subscriber node; (Location registration is to be executed). Thereby, the mobile device can appropriately select the hierarchized location registration area according to the change state of its own moving speed.

Embodiment 7 FIG.
Next, Embodiment 7 will be described. The configuration of the communication system of the present embodiment is the same as that of the communication system of the first embodiment described above. In the present embodiment, the mobile station notified from the base station using the broadcast information message for “information for selecting a hierarchized location registration area” indicates which of the hierarchized location registration areas. An operation of determining (selecting) whether to camp on an area and performing location registration for the selected area will be described. Here, “information for selecting a hierarchical location registration area” means “information on the number of hierarchy of location registration areas that can be selected by the mobile device (hierarchy number information)” and “information depending on the moving speed” "Threshold value for determining whether to camp in the location registration area of the hierarchy".

  In performing the location registration method according to the present embodiment, the base station performs the same operation as in Embodiment 6 described above, thereby “relating to the number of location registration area hierarchies that can be selected by the mobile device”. Information that sets information of “information (number of layers information)” and “threshold for determining which layer location registration area to camp according to moving speed” (hereinafter referred to as speed threshold) Are sent periodically. Specifically, in the operation corresponding to steps S605 and 606 (see FIG. 9) of the sixth embodiment described above, broadcast information in which the number of layers information and the speed threshold are set is transmitted.

  In addition, the mobile device that executes the location registration method according to the present embodiment acquires the number-of-layers information and the speed threshold in the operation corresponding to step S607 (see FIG. 9) of the above-described sixth embodiment, A location registration operation is executed based on the acquired information. Hereinafter, the location registration operation of the mobile device will be described in detail based on FIG. 1 and FIG. Here, FIG. 10 is a flowchart illustrating an operation example of the mobile device that executes the location registration method according to the seventh embodiment. Here, description will be made assuming that the mobile device 11 performs location registration in the location registration area managed by the subscriber node 32. In FIG. 10, processes similar to those of the mobile device of the fifth embodiment described above are given the same reference numerals and description thereof is omitted.

  When the mobile device 11 is waiting (step S501) and receives a time-out notification of a timer for notifying the timing of monitoring its own speed (step S502), as in the case of the above-described fifth embodiment, Step S504 is executed. In step S504, when it is determined that there is a speed change (step S505, Yes), the mobile device 11 uses the hierarchical number information and the speed threshold value acquired in advance from the base station, and hierarchized positions. The registration area is determined (reselected) (step S706). Specifically, when a change in movement speed is detected, the mobile device 11 compares the detected movement speed with a speed threshold value and determines that a position registration area different from the current position registration area should be selected. , Reselect the location registration area. Then, the mobile device 11 selects “update location registration area” as the location registration update reason set in the location registration update request message (step S707).

  Further, when receiving notification information notification (step S507) during standby (step S501), the mobile device 11 executes step S508 as in the case of the fifth embodiment described above. Next, the mobile device 11 stores the number-of-hierarchy information and the speed threshold value included in the notification information (step S710). In addition, the mobile device 11 executes the process of step S706 based on the information stored in step S710.

  When the mobile device 11 detects a change in the moving speed, the mobile device 11 reselects an appropriate location registration area based on the number-of-hierarchy information acquired in step S710, the speed threshold value, and the change state of the own moving speed. To do. The operation of reselecting the hierarchized location registration area is the same as in the fourth embodiment described above. When the position registration area is reselected, the mobile device 11 performs the same operation as that of the above-described fourth embodiment, and performs position registration for the reselected position registration area.

  After the location registration is completed, when the subscriber node 32 performs paging on the mobile device 11, the subscriber node 32 performs paging on the re-selected location registration area using the above-described paging method of the first or third embodiment. Distribute the request message.

  In the present embodiment, the subscriber node notifies the hierarchy number information and the speed threshold value as “information for selecting a hierarchized location registration area”. Similarly to the sixth embodiment described above, only the number-of-hierarchy information may be notified, and the location registration area hierarchized in the procedure of the fourth embodiment may be reselected. Similarly to the subscriber node of the second embodiment, the subscriber node reselects the base station that is the starting point when a failure occurs in the base station that is the starting point of the paging request message transfer. Also good.

  As described above, in this embodiment, the base station performs the number-of-layers information (information on the number of layers in the position registration area that can be selected by the mobile device) and the threshold value (which layer position registration according to the moving speed). The broadcast information in which information on a threshold value for determining whether to camp in the area) is periodically transmitted, and when the mobile station detects a change in the moving speed, the number-of-hierarchy information set in the broadcast information Based on the speed threshold, the hierarchized location registration area is selected again, and location registration is performed on the reselected area. Thereby, the mobile device can appropriately select the hierarchized location registration area according to the change state of its own moving speed.

Embodiment 8 FIG.
Next, an eighth embodiment will be described. The configuration of the communication system of the present embodiment is the same as that of the communication system of the first embodiment described above. In the present embodiment, the subscriber node that has received the location registration update request message from the mobile station transmits a response message to the message, thereby “information for selecting a hierarchical location registration area” ( The operation of notifying the mobile device of the number-of-hierarchy information and the threshold value will be described. Hereinafter, the operation of the subscriber node will be described with reference to FIG. 1 and FIG. FIG. 11 is a flowchart illustrating an example of an operation in which the subscriber node according to the eighth embodiment updates the location registration area of the mobile device. Here, it is assumed that the subscriber node 32 notifies the mobile device 11 of the “information for selecting a hierarchical location registration area” via the base station 23.

  The subscriber node 32 monitors the standby state of the mobile device existing in the location registration area managed by itself (step S801). When the subscriber node 32 receives a location registration update request message from the mobile station 11 via the base station 23 (step S802), the update reason set in the location registration update request message is the location registration. It is determined whether or not the area is updated (step S803). When the reason for the update is an update of the location registration area (step S803, Yes), the subscriber node 32 is a new update, that is, an update accompanying moving from the location registration area managed by another subscriber node. It is determined whether the update is due to movement between location registration areas managed by the user (step S804). If it is determined that the update is a new update (step S804, Yes), the subscriber node 32 uses the subscriber node identifier (ID) included in the location registration update request message to determine the old subscription of the source of the mobile station 11 The user node is specified, and context information of the mobile device 11 (such as an identifier of the mobile device temporarily assigned to the mobile device 11) is acquired (step S805).

  Next, the subscriber node 32 notifies the gateway node 41 of the update of the location registration area, and acquires the subscriber information of the mobile device 11 from the gateway node 41 (step S806). Next, the subscriber node 32 updates the location registration area of the mobile device 11 (step S807), and restarts a timer that monitors the standby state of the mobile device 11 (step S808). Next, the subscriber node 32, based on the identifier (ID) of the location registration area included in the location registration update request message, “information for selecting a hierarchical location registration area” (hierarchy number information and (Speed threshold) is determined, and a location registration update acceptance message (Routing Area Update Accept) in which the information is set is assembled and transmitted to the mobile device 11 (steps S809 and S810). Then, the subscriber node 32 waits for a location registration complete (Routing Area Update Complete) message transmitted from the mobile device 11 via the base station 23 (step S811).

  If it is determined in step S804 that the update is not new (step S804, No), the relationship between the subscriber node 32 and the gateway node 41 is not changed. Therefore, the subscriber node 32 executes the processes of steps S807 to S811 described above without executing the processes of steps S805 and S806.

  If it is determined in step S803 that the update reason is not an update of the location registration area (Yes in step S803), the subscriber node 32 determines whether the update reason is a periodic update (step S803). S812). If it is determined that the reason for the update is a periodic update (step S812, Yes), the subscriber node 32 further checks whether there is a change in the identifier of the location registration area notified from the mobile device 11 (in the location registration area). It is determined whether there is any change (step S813). If it is determined that there is no change in the location registration area (step S813, Yes), the subscriber node 32 executes the processes of steps S808 to S811 described above.

  On the other hand, when it is determined in step S812 that the update reason is not a periodic update (step S812, No), or when it is determined in step S813 that there is a change in the location registration area (step S813, No). The subscriber node 32 determines that the content of the location registration update request message received in step S802 is not correct. Then, the subscriber node 32 assembles a location registration update rejection message, transmits the rejection message to the mobile device 11 (step S814), and transitions to a standby state monitoring state (step S815).

  In addition, when the location registration update acceptance message transmitted in step S810 is received, the mobile station 11 thereafter changes the information (hierarchy number information and speed threshold value) included in the message and the change state of its own movement speed. Based on, re-select the appropriate location registration area. The operation of reselecting the hierarchized location registration area is the same as that in the seventh embodiment. When the position registration area is reselected, the mobile device 11 performs the same operation as that of the above-described fourth embodiment, and performs position registration for the reselected position registration area.

  After the location registration is completed, when the subscriber node 32 performs paging on the mobile device 11, the subscriber node 32 performs paging on the re-selected location registration area using the above-described paging method of the first or third embodiment. Distribute the request message.

  In the present embodiment, the subscriber node notifies the hierarchy number information and the speed threshold value as “information for selecting a hierarchized location registration area”. Similarly to the sixth embodiment described above, only the number-of-hierarchy information may be notified, and the location registration area hierarchized in the procedure of the fourth embodiment may be reselected. Similarly to the subscriber node of the second embodiment, the subscriber node reselects the base station that is the starting point when a failure occurs in the base station that is the starting point of the paging request message transfer. Also good.

  Thus, in this embodiment, when a subscriber node receives a location registration update request message from a mobile device via a base station, the number of layers information (number of location registration area layers that the mobile device can select) Information) and a speed threshold (threshold for deciding which location registration area to camp according to the moving speed) is sent to the mobile device, and then the mobile device Decided to re-select the hierarchized location registration area based on the number-of-hierarchy information and the speed threshold set in the response message, and perform location registration for the selected area. Thereby, the mobile device can appropriately select the hierarchized location registration area according to the change state of its own moving speed.

Embodiment 9 FIG.
Subsequently, Embodiment 9 will be described. The configuration of the communication system of the present embodiment is the same as that of the communication system of the first embodiment described above. In the present embodiment, based on the history of the contents of the location registration update request message received from the mobile device, the subscriber node forms a location registration area that is dynamically expanded by combining location registration areas as necessary. The operation and the operation of solving the combination and reducing the location registration area will be described. Further, an operation for notifying the mobile station of information on the location registration area changed (expanded or reduced) by the subscriber node via the base station will be described. Hereinafter, the operation will be described in detail based on FIG. 1, FIG. 12, and FIG.

  FIG. 12 illustrates an example of an operation in which a subscriber node changes a location registration area, which is an operation according to the ninth embodiment, and an operation in which information regarding the location registration area after the change is notified to a mobile device via a base station. It is a flowchart which shows. In FIG. 12, the same processes as those of the above-described subscriber node of the eighth embodiment are denoted by the same reference numerals, and the description thereof is omitted. FIG. 13 is a diagram illustrating a configuration example of a location registration area hierarchized in accordance with the location registration area changing operation according to the ninth embodiment. Note that the hierarchy 3 and the hierarchy 4 indicated by dotted lines are location registration areas that do not normally exist as location registration areas but are expanded (added) as necessary. In FIG. 13, the part described as “xx” in the numerical value indicating the example of the location registration area ID indicates that the part is masked and treated (Don't Care). Here, it is assumed that the subscriber node 32 changes the location registration area and notifies the mobile device 11 of information regarding the changed area via the base station 23.

  When the subscriber node 32 receives a normal location registration update request message from the mobile device 11 via the base station 23, the processing from step S803 to step S807 in the above-described eighth embodiment (see FIG. 11). The same process is executed, and the location registration area of the mobile device 11 is updated. Then, the subscriber node 32 executes the process shown in FIG. 12 following the process of step S807.

  The subscriber node 32 updates statistical information (history information of the contents of the location registration update request message) that manages how the mobile device 11 has moved in the location registration area (step S901). Then, if the analysis result of the statistical information updated in step S901 indicates that, for example, the mobile station 11 frequently moves between the location registration areas of the hierarchy 2 shown in FIG. 13, the subscriber node 32 and the mobile station 11 The number of transmission / reception of control messages accompanying the location registration update increases. Therefore, the subscriber node 32 needs to add the hierarchy 3 (need to increase the number of stages of the hierarchical structure) and change the hierarchy number of the hierarchical location registration area shown in FIG. If it is determined that the mobile station 11 is to be used for notification (Yes in step S902), the expanded number of layers (number of layers information after change) and speed threshold for each base station managed by itself. A broadcast information update request message in which a value (threshold for deciding in which location registration area to camp according to the moving speed) is set is transmitted to the base station (step S903). The base station periodically transmits the broadcast information in which the information about the expanded number of layers and the speed threshold is set by performing the same operation as in the above-described sixth embodiment.

  Then, the subscriber node 32 restarts a monitoring timer that monitors the standby state of the mobile device 11 (step S904). Note that the subscriber node 32 determines in step S902 that the addition of the layer 3 is not necessary or the change in the number of layers is not notified to the mobile device 11 using the notification information (No in step S902). ), The monitoring timer for monitoring the standby state of the mobile device 11 is restarted (step S904). The base station 23 that has received the broadcast information update request message performs the same operation as that of the base station of the sixth embodiment described above, and transmits broadcast information (System Information).

  Further, the subscriber node 32 needs to add the hierarchy 3 and change the number of hierarchized location registration areas shown in FIG. 13 to the mobile device 11 using the location registration update acceptance message. If it is determined to be notified (step S905, Yes), the location registration update acceptance message in which the expanded number of layers (layer number information after change) and the movement threshold value are set is assembled, and the subscriber node of the above-described eighth embodiment In the same manner as above, the data is transmitted to the mobile device 11 via the base station 23 (steps S907 and S810). Then, the subscriber node 32 waits for a location registration completion message transmitted from the mobile device 11 via the base station 23 (step S909).

  On the other hand, when the subscriber node 32 determines in step S905 that the addition of the layer 3 is unnecessary or the change of the number of layers in the location registration area is not notified by the location registration update acceptance message (No in step S905). A location registration update acceptance message in which the number of hierarchies not changed (hierarchy number information) and a speed threshold is set is assembled and transmitted to the mobile device 11 via the base station 23 (steps S809 and S810).

  When receiving the information (the expanded number of hierarchies and the speed threshold value) included in the message transmitted in step S903 or S907, the mobile station 11 determines the area based on the received information as in the seventh embodiment. Is selected again, and location registration is executed by the same procedure as in the fourth embodiment.

  Note that the subscriber node 32 detects that the mobile device 11 frequently moves between the location registration areas of the hierarchy 3 after adding the location registration area of the hierarchy 3, and further adds the hierarchy 4 location registration area. The process is similar. In addition, after the subscriber node 32 adds the location registration area of the hierarchy 3 or 4, it detects a decrease in the movement frequency between the location registration areas of the mobile device 11 and deletes the location registration area of the hierarchy 3 or 4. The process in this case (the process of notifying the expanded number of layers and the speed threshold value to the mobile device) is the same procedure.

  After the location registration is completed, when the subscriber node 32 performs paging on the mobile device 11, the subscriber node 32 performs paging on the re-selected location registration area using the above-described paging method of the first or third embodiment. Distribute the request message.

  In the present embodiment, the subscriber node notifies the hierarchy number information and the speed threshold value as “information for selecting a hierarchized location registration area”. Similarly to the sixth embodiment described above, only the number-of-hierarchy information may be notified, and the location registration area hierarchized in the procedure of the fourth embodiment may be reselected. Similarly to the subscriber node of the second embodiment, the subscriber node reselects the base station that is the starting point when a failure occurs in the base station that is the starting point of the paging request message transfer. Also good.

  Thus, in this embodiment, when a location registration update request is received from a mobile device via a base station, the subscriber node operates based on the history of the contents of the received location registration update request message. The location registration area is changed, and information indicating the change result (hierarchical number information after change) is notified using broadcast information transmitted via the base station or a response message to the location registration update request message. It was decided to. Thereby, the subscriber node can flexibly increase / decrease the hierarchized location registration area as necessary, and the mobile station can change the hierarchized location registration area according to the change state of its own moving speed. Can be selected appropriately.

Embodiment 10 FIG.
Subsequently, Embodiment 10 will be described. The configuration of the communication system of the present embodiment is the same as that of the communication system of the first embodiment described above. In this embodiment, when a subscriber node performs paging on a mobile device, the paging request message is transferred to all base stations forming the location registration area where the mobile device is camping. An operation for transmitting a paging request message by setting such a hop limit value and an operation for the base station to transfer the received paging request message will be described.

  Hereinafter, based on FIG. 1 and FIG. 14, an operation in which the subscriber node performs paging on the mobile device will be described in detail. Here, FIG. 14 is a sequence diagram illustrating an example of operations of the subscriber node and the base station that execute the paging method according to the tenth embodiment.

  First, location registration is executed according to the procedure described in any of the above-described fourth to ninth embodiments, and a mobile device camping in a location registration area whose ID is “01 00 00 01” and whose hierarchy is “1” 11 will be described when the subscriber node 32 performs paging. In the location registration area, it is assumed that the base station 22 is selected as the starting point for transferring the paging request message.

  When paging for the mobile device 11 in the standby state, the subscriber node 32 first searches for a location registration area where the mobile device 11 is registered (step S1001). Next, based on the location registration area (ID: 01 00 00 01, layer: 1) obtained by the search, the subscriber node 32 determines the base station that is the starting point of the transfer of the paging request message and the paging request message. A hop limit to be set is searched (step S1002). Depending on the network configuration, etc., the hop limit may be used in multiple ways, such as the hop limit used when transferring messages in the first direction and the hop limit used when transferring messages in the second direction. Good. As a result, the subscriber node can individually specify the hop limit for each transfer direction when the base station that is the starting point for message transfer transfers messages in multiple directions. The message can be prevented from being transferred. In this example, it is assumed that a hop limit for two directions is used, and a base station that is a starting point for message transfer transfers a message to two adjacent base stations. In addition, the search result in step S1002 shows that the origin of transfer is “base station 22”, the hop limit when transferring in the first direction (hop limit # 1), and the hop limit when transferring in the second direction (hop limit) Both # 2) are "2".

  Next, the subscriber node 32 transmits a paging request message in which the hop limit of the search result in step S1002 is set to the base station 22 (step S1003). Thereafter, the same processing as in the third embodiment described above is executed, and the paging request message transmitted to the base station 22 is distributed within the location registration area where the mobile device 11 is camping. Specifically, the base station 22 transfers the paging request message to the adjacent base stations 21 and 23 according to the hop limit set in the received paging request message (step S1004). When transferring the paging request message, each base station subtracts the hop limit set in the paging request message by performing the same processing as in the fourth embodiment. In this example, the hop limit set in the paging request message transferred from the base station 22 to the base stations 21 and 23 is “1”.

  Receiving the paging request message, the base stations 21 and 23 confirm the hop limit set in the message and determine whether to transfer the paging request message. In this example, since the hop limit set in the paging request message received by the base stations 21 and 23 is “1”, the base stations 21 and 23 do not transfer the received message (step S1005, S1006).

  After that, by reselecting the location registration area of the higher hierarchy and performing location registration for the reselected location registration area, the location registration area whose ID is “01 00 00 01” and the hierarchy is “2” The operation when the subscriber node 32 performs paging on the mobile device 11 that has been camping will be described with reference to FIGS. In the location registration area, it is assumed that the base station 23 is selected as the starting point for transferring the paging request message. In addition, the base station 23 serving as the transfer start point determines a hop limit to be set in the paging request message to be transferred to the base station 22 based on the hop limit # 1 and transfers the paging request message to the base station 24. Assume that the hop limit to be set is determined based on hop limit # 2.

  First, the subscriber node 32 searches for a location registration area in which the mobile device 11 is registered (step S1007). Next, the subscriber node 32 makes a paging request based on the location registration area (ID: 01 00 00 01, hierarchy: 2 because the lowest level is masked and ID: 01 00 00 xx) obtained by the search. The base station that is the starting point of the message transfer and the hop limit set in the paging request message are searched (step S1008). Note that the search result in step S1008 is that the transfer start point is “base station 23”, and the search results for hop limit # 1 and # 2 are “3” and “4”, respectively.

  Next, the subscriber node 32 transmits a paging request message in which the hop limit of the search result in step S1008 is set to the base station 23 (step S1009). The base station 23 transfers the paging request message to the adjacent base stations 22 and 24 according to the hop limit set in the received paging request message (step S1010). In this example, the hop limits set in the paging request message transferred from the base station 23 to the base stations 22 and 24 are “2” and “3”, respectively.

  Receiving the paging request message, the base stations 22 and 24 confirm the hop limit set in the message and forward the message to the base stations 21 and 25, respectively (steps S1011 and S1012). The base station 21 confirms the hop limit set in the received paging request message, and does not transfer the message because the hop limit is “1” (step S1013). On the other hand, the base station 25 confirms the hop limit set in the received paging request message, and further transfers the message to the base station 26 (step S1014). The base station 26 confirms the hop limit set in the received paging request message, and does not transfer the message because the hop limit is “1” (step S1015).

  Note that, in the same way as the above-described subscriber node of the second embodiment, the subscriber node of the present embodiment selects the base station that is the starting point when a failure occurs in the base station that is the starting point of the paging request message transfer. It may be reselected.

  Thus, in the present embodiment, when a subscriber node performs paging on a mobile device, a location registration area in which the mobile device is camping (last location registration) is formed. The hop limit value is set and transmitted so that the paging request message is transferred to each base station. As a result, even when the mobile device re-registers a location in a location registration area of a different hierarchy, the subscriber node can connect each base station that forms the location registration area where the mobile device re-registers the location. On the other hand, the paging request message can be easily distributed.

Embodiment 11 FIG.
Next, Embodiment 11 will be described. The configuration of the communication system of the present embodiment is the same as that of the communication system of the first embodiment described above. In the present embodiment, each time a subscriber node transmits a paging request message, the base station that is the starting point for transferring the paging request message is changed, and further, the base station that is the starting point for the hop limit set in the message An operation for paging an arbitrary mobile device while adjusting each time will be described.

  Hereinafter, based on FIG. 1 and FIG. 15, the operation in which the subscriber node performs paging on the mobile device will be described in detail. Here, FIG. 15 is a sequence diagram illustrating an example of operations of the subscriber node and the base station that execute the paging method according to the eleventh embodiment.

  Here, location registration is executed according to the procedure described in any of Embodiments 4 to 9, and the mobile device 11 camping in the location registration area whose ID is “01 00 00 00” An operation in which the subscriber node 32 performs paging will be described. In the location registration area, it is assumed that the base station 23 is selected as the starting point for transferring the paging request message. The base station that transfers the paging request message determines the hop limit set in the message to be transferred to the base station to which a code smaller than that of the own station is assigned based on the hop limit # 1 and A hop limit set in a message to be transferred to a base station to which a large code is assigned is determined based on hop limit # 2.

  When the subscriber node 32 performs paging on the mobile device 11 in the standby state, the subscriber node 32 searches for a location registration area where the mobile device 11 is registered (step S1101). Next, the subscriber node 32, based on the location registration area (ID: 01 00 00 00) obtained by the search, the base station that is the starting point of the transfer of the paging request message and the hop limit set in the paging request message Is searched (step S1102). The search result in step S1102 is “base station 23” as the transfer start point, and “3” as the search results for both hop limits # 1 and # 2. Next, the subscriber node 32 transmits a paging request message in which the hop limit of the search result in step S1102 is set to the base station 23 (step S1103). Further, after transmitting the paging request message, the subscriber node 32 changes the starting point of the paging request message transfer from the base station 23 to the base station 24 in preparation for the next paging for the same location registration area.

  Thereafter, the same processing as in the third embodiment described above is executed, and the paging request message transmitted to the base station 22 is distributed within the location registration area where the mobile device 11 is camping. Specifically, the base station 23 transfers the paging request message to the adjacent base stations 22 and 24 according to the hop limit set in the received paging request message (step S1104). When transferring the paging request message, each base station subtracts the hop limit set in the paging request message by performing the same processing as in the fourth embodiment.

  Receiving the paging request message, the base stations 22 and 24 confirm the hop limit set in the message and forward the message to the base stations 21 and 25, respectively (steps S1105 and S1106). The base stations 21 and 25 confirm the hop limit set in the received paging request message. Since both the hop limits set in the paging request messages received by the base stations 21 and 25 are “1”, the base stations 21 and 25 do not transfer the received messages (steps S1107 and S1108).

  Thereafter, when paging is performed again on the mobile device 11, the subscriber node 32 searches for a location registration area where the mobile device 11 is registered (step S1109). Next, the subscriber node 32, based on the location registration area (ID: 01 00 00 00) obtained by the search, the base station that is the starting point of the transfer of the paging request message and the hop limit set in the paging request message Is searched (step S1110). Note that the search results in step S1110 are “base station 24” for the transfer start point, and “4” and “2” for the search results for hop limit # 1 and # 2, respectively. Next, the subscriber node 32 transmits a paging request message in which the hop limit of the search result in step S1110 is set to the base station 24 (step S1111). Further, after transmitting the paging request message, the subscriber node 32 changes the starting point of the transfer of the paging request message from the base station 24 to the base station 25 in preparation for the next paging for the same location registration area.

  The base station 24 transfers the paging request message to the adjacent base stations 23 and 25 according to the hop limit set in the received paging request message (step S1112). In this example, the hop limits set in the paging request message transferred from the base station 24 to the base stations 23 and 25 are “3” and “1”, respectively.

  The base station 25 confirms the hop limit set in the received paging request message, and does not transfer the message because the hop limit is “1” (step S1114). On the other hand, the base station 23 confirms the hop limit set in the received paging request message, and further transfers the message to the base station 22 (step S1113). The base station 22 confirms the hop limit set in the received paging request message, and further transfers the message to the base station 21 (step S1115). The base station 21 confirms the hop limit set in the received paging request message, and does not transfer the message because the hop limit is “1” (step S1116).

  Note that the paging operation (paging method) of the present embodiment is the paging operation for the above-described location registration areas (non-hierarchical location registration areas) of Embodiments 1 to 3, and the location registration of Embodiments 4 to 10. This can be applied to any of paging operations for areas (hierarchical location registration areas).

  Similarly to the subscriber node of the second embodiment described above, the subscriber node of the present embodiment is the base station that is the starting point even when a failure occurs in the base station that is the starting point of the paging request message transfer. The station may be reselected.

  As described above, in this embodiment, each time a paging occurs, a subscriber node starts a base station that is a starting point for transferring a paging request message when distributing the paging request message to base stations in the location registration area. In addition, the hop limit set in the paging request message is adjusted for each base station that is the starting point of the message transfer. Thereby, the burden given to the base station by the occurrence of paging can be distributed among base stations forming the same location registration area.

Embodiment 12 FIG.
Next, the twelfth embodiment will be described. The configuration of the communication system of the present embodiment is the same as that of the communication system of the first embodiment described above. In the present embodiment, a subscriber node superimposes a control message of a session control protocol that is originally transmitted independently on a paging request message and transmits it to the mobile device. In addition, the mobile device superimposes a response message that is originally transmitted independently of the received control message on the paging response message and transmits it to the subscriber node.

  Hereinafter, an operation in which the subscriber node performs paging with respect to the mobile device will be described with reference to FIG. 1, FIG. 16, and FIG. Here, FIG. 16 is a sequence diagram illustrating an example of operations of the subscriber node and the base station that execute the paging method according to the twelfth embodiment. FIG. 17 is a diagram illustrating a configuration example of a paging request message transmitted from the base station to the mobile device. The configuration of the paging request message (hereinafter referred to as paging request MSG # 1) transmitted from the subscriber node to the base station is the same as that described in the third embodiment (see FIG. 17), the paging request message (hereinafter referred to as paging request MSG # 2) shown in FIG. 17 is a part of the paging request for each mobile station of paging request MSG # 1 (each “included in payload 2 in FIG. 5). Paging Request (x) ”(x: 1, 2, 3,..., N)).

  In FIG. 17, MT (Message Type) indicates the type of message, and ICI (Integrity Check Information) is an area for storing information for confirming the validity of the message itself. Paging Cause indicates the reason for paging, and IMSI (International Mobile Subscriber Identifier) indicates the identifier of the mobile device that is the target of paging. As an option, a session initialization request message that is a control message of the session control protocol is superimposed.

  Here, an operation in which the subscriber node 32 performs paging on the mobile device 11 camping in the location registration area with the ID “01 00 00 00” will be described. In the location registration area, it is assumed that the base station 23 is selected as the starting point for transferring the paging request message.

  When the gateway node 41 of the mobile network 61 receives a session initialization request message (Session Initiation Request) addressed to the mobile device 11, it searches for a routing destination according to the management information of the location registration area registered by each mobile device ( Step S1201). Then, the gateway node 41 transfers the received session initialization request message to the subscriber node 32 that is the location registration destination of the mobile device 11 that is the destination of the message (step S1202). When the subscriber node 32 receives the session initialization request message, the subscriber node 32 searches for a location registration area in which the mobile device 11 is registered (step S1203). Next, the subscriber node 32 searches for a base station that is the starting point of the transfer of the paging request message in the location registration area 51 that is the search result of step S1203 (step S1204). Then, the subscriber node 32 transmits the paging request MSG # 1 in which the session initialization request message is superimposed to the base station 23 that is the search result of step S1204 (step S1205).

  The base station 23 that has received the paging request MSG # 1 moves in the paging request MSG # 1 via the control signal transmission path so as to reach all the base stations in the location registration area where the own station exists. The paging request MSG # 2 addressed to the machine 11 is transferred (step S1206). For example, the base station 23 forwards the paging request MSG # 2 to the adjacent base stations 22 and 24, and the base stations 22 and 24 transmit the received message to the adjacent base stations 21 and 25, respectively. Forward. The base stations 21 to 25 that have received the paging request MSG # 2 perform paging by performing the same operation as the base station of the third embodiment described above (step S1207).

  The mobile station 11 that has received the paging request MSG # 2 addressed to itself under the control of the base station 22 (via the base station 22) transmits an initialization response (Session Initiation) to the session initialization request message via the base station 22. A paging response message (Paging Response) on which Response is superimposed is transmitted to the subscriber node 32 (S1208). The subscriber node 32 that has received the paging response message extracts the initialization response included in the message, and transmits an initialization response message in which the initialization response is set to the gateway node 41 (step S1209). Further, the subscriber node 32 executes authentication processing of the mobile device 11 as necessary (S1210), and then sets a radio access bearer for application communication with the mobile device 11 (step S1211).

  Note that the paging operation (paging method) of the present embodiment is the paging operation for the above-described location registration areas (non-hierarchical location registration areas) of Embodiments 1 to 3, and the location registration of Embodiments 4 to 11. This can be applied to any of paging operations for areas (hierarchical location registration areas).

  In addition to the paging method according to the present invention described in the first embodiment (a method of transmitting a paging request message to a base station serving as a transfer start point), the session initialization is performed in the paging method according to the conventional method. It is also possible to superimpose the request message on the paging request message and superimpose the response message on the session initialization request message on the paging response message.

  Similarly to the subscriber node of the second embodiment described above, the subscriber node of the present embodiment sets the base station that is the starting point when a failure occurs in the base station that is the starting point of the paging request message transfer. It may be reselected. Further, as with the subscriber node of the eleventh embodiment, the base station that is the starting point may be sequentially changed every time paging occurs.

  Thus, in this embodiment, when a subscriber node performs paging for a mobile device whose location is registered, the control message of the session control protocol is superimposed and transmitted. A paging response message in which a response message to the control message is superimposed is transmitted to the subscriber node. As a result, messages exchanged between the base station and the subscriber node can be reduced, connection delay at the time of session activation can be reduced, and the amount of signal used by the subscriber node for paging of the mobile device Can be reduced.

  As described above, the paging method and the location registration method according to the present invention are useful for a communication network, and in particular, location registration processing associated with movement of a mobile device and paging processing for a mobile device existing in a specific location registration area. It is suitable for a node device and a mobile device that execute.

It is a figure which shows the structural example of Embodiment 1 of the communication system containing the mobile network which implement | achieves the paging method and location registration method concerning this invention. 6 is a sequence diagram illustrating an example of a paging method according to Embodiment 1. FIG. It is a sequence diagram which shows the operation example of a subscriber node when a system failure generate | occur | produces in the base station which is the starting point of transfer of a paging request message. It is a sequence diagram which shows the operation example which the base station contained in the same location registration area transfers a paging request message. It is a figure which shows the structural example of the paging request message which a subscriber node transmits with respect to a base station. It is a sequence diagram which shows an example of the position registration method concerning Embodiment 4. It is a figure which shows the structural example of the position registration area which implement | achieves the position registration method concerning Embodiment 4. FIG. 10 is a flowchart illustrating an operation example of a mobile device that executes a location registration method according to a fifth exemplary embodiment; FIG. 15 is a sequence diagram illustrating an operation example in which the base station according to the sixth embodiment transmits information on a location registration area to a mobile device. 15 is a flowchart illustrating an operation example of a mobile device that executes a location registration method according to a seventh embodiment; It is a flowchart which shows an example of the operation | movement in which the subscriber node of Embodiment 8 updates the location registration area of a mobile device. 20 is a flowchart illustrating an example of a location registration area changing operation according to the ninth embodiment; It is a figure which shows the structural example of the location registration area hierarchized with the change operation of the location registration area concerning Embodiment 9. FIG. FIG. 23 is a sequence diagram illustrating an example of operations of a subscriber node and a base station that execute a paging method according to a tenth embodiment; FIG. 23 is a sequence diagram illustrating an example of operations of a subscriber node and a base station that execute the paging method according to the eleventh embodiment; FIG. 23 is a sequence diagram illustrating an example of operations of a subscriber node and a base station that execute a paging method according to a twelfth embodiment; It is a figure which shows the structural example of the paging request message which a base station transmits with respect to a mobile device.

Explanation of symbols

11, 12 Mobile device 21, 22, 23, 24, 25, 26, 27, 28, 29 Radio base station 31, 32, 33 Subscriber node 41, 42 Gateway node 51, 52, 53, 54, 55 Location registration area (Wireless access network)
61 Mobile network 71 Communication network

Claims (15)

A paging method for transmitting a paging request message to a mobile device,
The subscriber node receives a paging request message addressed to the mobile device from a plurality of base stations forming a location registration area where the specific mobile device is located (camped), and the paging request message A base station search step for searching for a base station (destination base station) that transfers to another base station in the location registration area;
A message transmission step in which the subscriber node transmits a paging request message addressed to the mobile device to the destination base station;
A message transfer step of transferring the received paging request message so that the destination base station reaches all the base stations forming the location registration area; and
Only including,
Each time the subscriber node executes the message transmission step, the subscriber node changes the destination base station to another base station in the location registration area where the destination base station exists, A paging method characterized in that the base stations are controlled in order to operate as transmission destination base stations . Paging method for transmitting a paging request message to a mobile device camping on one of a plurality of location registration areas (hierarchical location registration areas) whose size is hierarchically set according to the moving speed Because
A subscriber node receives a paging request message addressed to the mobile device from a plurality of base stations forming the location registration area and forwards the paging request message to another base station in the location registration area. A base station search step of searching for a base station (destination base station),
A message transmission step in which the subscriber node transmits a paging request message addressed to the mobile device to the destination base station;
A message transfer step of transferring the received paging request message so that the destination base station reaches all the base stations forming the location registration area; and
Only including,
Each time the subscriber node executes the message transmission step, the subscriber node changes the destination base station to another base station in the location registration area where the destination base station exists, A paging method characterized in that a base station is controlled so as to operate as a transmission destination base station in order . further,
The mobile device reselects one location registration area from the plurality of location registration areas according to a change in moving speed, and subscribes information on the reselected location registration area (location registration area information). An area reselection process to be sent to the sender node;
An area information update step in which the subscriber node updates information (camping area information) related to a location registration area where the mobile device is camping based on the location registration area information;
Including
The paging method according to claim 2, wherein when the subscriber node updates the camp area information, the subscriber node transmits a paging request message to the mobile device based on the updated camp area information.   In the area reselection step, when an increase in movement speed is detected, a position registration area wider than the current position registration area is selected again. 4. The paging method according to claim 3, wherein a narrow position registration area is reselected. further,
A change area information transmission step for transmitting information on a new location registration area (location registration area information) to the subscriber node when the mobile station detects a change in the location registration area;
A periodic area information transmission step in which the mobile station periodically transmits information on the current location registration area (location registration area information) to the subscriber node;
Including
In the area information update step, the camping area information of the mobile device is further updated based on the location registration area information transmitted in the change area information transmission step and the periodic area information transmission step. Item 5. A paging method according to Item 3 or 4. further,
The subscriber node sends a broadcast information update request message including information on the number of layers (location registration area) that can be selected by the mobile device (layer number information) to the base station that communicates with the mobile device. And the base station obtains the number of layers information from the received broadcast information update request message and notifies the mobile device of the number of layers information,
Including
6. The paging method according to claim 3, 4 or 5, wherein, in the area reselecting step, a position registration area is reselected based on the number-of-hierarchy information and its own moving speed. In the step of notifying the number of hierarchies, the subscriber node further includes information (speed) on a threshold for determining which location registration area to camp in the broadcast information update request message according to the moving speed. Including the threshold), and the base station acquires the layer number information and the speed threshold from the received broadcast information update request message and notifies the mobile device,
7. The paging method according to claim 6, wherein, in the area reselecting step, a position registration area is reselected based on the number-of-hierarchy information, its own moving speed, and the speed threshold value. further,
After the processing of the area information update process is completed, the subscriber node can select a hierarchy (selectable by the mobile device) in a location registration update acceptance message for notifying that the process of the area information update process is completed. Including information on the number of location registration areas) (hierarchical number information), and transmitting the hierarchical area information to the mobile device;
Including
6. The paging method according to claim 3, 4 or 5, wherein, in the area reselecting step, a position registration area is reselected based on the number-of-hierarchy information and its own moving speed. In the hierarchical area information transmission step, the subscriber node further includes information on a threshold value for determining in which location registration area to camp in the location registration update acceptance message and in accordance with a moving speed. Speed threshold), and the base station acquires the number of layers information and the speed threshold from the received location registration update acceptance message and notifies the mobile device,
9. The paging method according to claim 8, wherein, in the area reselecting step, a position registration area is reselected based on the number-of-hierarchy information, its own moving speed, and the speed threshold value. further,
A history information update step in which the subscriber node updates the history information of the location registration area information that is selected and notified in the area reselection step;
A step of changing the number of hierarchies, wherein the subscriber node changes the number of hierarchies information based on the updated history information;
Including
In the layer number notification step, the subscriber node transmits the broadcast information update request message including the changed layer number information, and the base station has changed the received broadcast information update request message from the received broadcast information update request message. The paging method according to claim 6 or 7, wherein the number-of-hierarchy information is acquired and notified to the mobile device. further,
A history information update step in which the subscriber node updates the history information of the location registration area information that is selected and notified in the area reselection step;
A step of changing the number of hierarchies, wherein the subscriber node changes the number of hierarchies information based on the updated history information;
Including
In the hierarchical area information transmission step, the subscriber node transmits the location registration update acceptance message including the changed hierarchy number information, and the base station changes the received location registration update acceptance message from the received location registration update acceptance message. The paging method according to claim 8 or 9, wherein the information on the number of hierarchies obtained is acquired and notified to the mobile device. further,
When the subscriber node detects a failure of the destination base station, a paging addressed to the mobile station is assigned to a base station other than the destination base station that forms a location registration area where the destination base station exists. A base station reselection step of selecting as a new destination base station to receive the request message;
Including
The said new transmission destination base station transfers the received paging request message so that a paging request message may reach | attain all the base stations which form the said location registration area. The paging method according to any one of the above.   In the base station reselection step, an inquiry is periodically made to confirm whether the transmission destination base station is operating normally. If there is a response within a specified time, the base station operates normally. 13. The paging method according to claim 12, wherein if there is no response within a specified time, it is determined that a failure has occurred. In the message transmission step, a hop limit for determining whether to transfer a paging request message is set in the paging request message,
In the message transfer step, based on the hop limit set in the paging request message, the paging request message is transferred to surrounding base stations, and thereafter, the base station that has received the transferred paging request message receives The paging method according to any one of claims 1 to 13, wherein the paging request message is further transferred to surrounding base stations based on the hop limit set in the paging request message. In the message transmission step, a paging request message in which information included in the session initialization request message is set is transmitted,
The mobile device that has received the paging request message sets information included in a response message to the session initialization request message in a response message to the paging request message and returns the information to the subscriber node. Item 15. The paging method according to any one of Items 1 to 14 .

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