JP4971263B2 - Mobile communication method, mobile station, and radio access network apparatus - Google Patents

Description

  The present invention relates to a mobile communication method, a mobile station, and a radio access network apparatus.

In a general mobile communication system, a mobile station is configured to select a cell with optimal radio quality based on the reception quality of received broadcast information and perform location registration processing (attach processing) in the cell. Yes.
JP 2004-187104 A

  However, for example, when a home cell radio base station is arranged immediately below an outdoor macro cell radio base station, the mobile station autonomously and preferentially waits in a macro cell with good radio quality, so it is quite difficult. There was a problem that it was not possible to wait in the home cell.

For example, by including the home cell in the neighboring cell information in the broadcast information of the macro cell and adjusting the offset value Q _offset related to the home cell, it is possible to facilitate standby in the home cell. Also, there is a problem that a mobile station that does not have access rights to the home cell is guided to the home cell.

  Further, when a large number of home cells exist in the macro cell, the signal becomes redundant by including the large number of home cells in the neighboring cell information in the broadcast information, and the consumption due to performing redundant measurement in the mobile station There was a problem that concerns such as power reduction occurred.

  Therefore, the present invention has been made in view of the above-described problem, and when the home cell exists in the macro cell and the home cell is not included in the neighboring cell information in the broadcast information, or An object of the present invention is to provide a mobile communication method, a mobile station, and a radio access network apparatus that can perform standby in a home cell even when a normal broadcast information search means by a mobile station cannot search a home cell. .

  A first feature of the present invention is a mobile communication method, in which a mobile station waiting in a macro cell establishes a connection with a radio access network device when a predetermined trigger is detected, and A step B in which a radio access network device notifies the mobile station of a home cell to which an access right is granted to the mobile station via the connection; and And a step C of measuring reception quality of broadcast information in the home cell.

  A second feature of the present invention is a mobile station, and when a predetermined trigger is detected while waiting in a macro cell, the mobile station transmits a connection setting request including predetermined information to the radio access network device. A connection setting processing unit configured to establish a connection with the radio access network device, and measuring the reception quality of the broadcast information in the home cell included in the measurement control information received from the radio access network device, The measurement unit configured to notify the wireless access network device of the measurement result, and the connection is disconnected in response to the standby cell change instruction and the connection disconnection instruction received from the wireless access network device. When waiting in the home cell And summarized in that comprises a standby processor is configured so that.

  According to a third aspect of the present invention, there is provided a wireless access network apparatus configured to establish a connection with a mobile station in response to a connection setting request including predetermined information received from the mobile station. A connection setting processing unit and measurement control configured to transmit measurement control information including a home cell to which an access right is granted to the mobile station to the mobile station via the connection The connection setting processing unit disconnects the connection to the mobile station when receiving a measurement result including reception quality of broadcast information in the home cell from the mobile station. It is configured to transmit a standby cell change instruction and a connection disconnection instruction instructing to start standby in the home cell. The gist.

  As described above, according to the present invention, when the home cell exists in the macro cell, the home cell is not included in the neighboring cell information in the broadcast information, or when the mobile station A mobile communication method, a mobile station, and a radio access network apparatus that can perform standby in the home cell even when the broadcast information search means cannot search the home cell can be provided.

(Configuration of mobile communication system according to the first embodiment of the present invention)
The configuration of the mobile communication system according to the first embodiment of the present invention will be described with reference to FIG. 1 to FIG.

  As shown in FIG. 1, the mobile communication system according to the present embodiment includes a core network device 20, a radio access network device 10, a macrocell radio base station #A that manages a macrocell #A, and a home cell # a1. A macro cell radio base station # a1 to be managed and a home cell radio base station # a2 to manage the home cell # a2 are provided.

  As illustrated in FIG. 2, the mobile station UE # 1 includes a trigger detection unit 11, a location registration processing unit 12, a standby processing unit 13, an RRC connection setting processing unit 14, and a measurement unit 15. .

  The trigger detection unit 11 is configured to detect a predetermined trigger. For example, the trigger detection unit 11 performs, as a predetermined trigger, a predetermined operation by the user (power ON, pressing a predetermined button, etc.), the mobile station UE # 1 performing a location registration process (attach process) for the macro cell #A, etc. Configured to detect.

  The location registration processing unit 12 is configured to perform location registration processing (attach processing) on the location registration area including the standby cell. For example, the location registration processing unit 12 is configured to perform location registration processing when the standby cell of the mobile station UE # 1 is switched between “macro cell #A” and “home cell # a1”. .

  The standby processing unit 13 is configured to perform standby processing in a cell that satisfies a predetermined condition. For example, when the RRC connection is disconnected in response to the standby cell change instruction and the connection disconnection instruction (RRC Connection Release / Reject) received from the radio access network device 10, the standby processing unit 13 performs the standby cell change instruction and It is configured to start waiting in the home cell # a1 designated by the connection disconnection instruction.

  Here, the home cell # a1 designated as the standby cell by the standby cell change instruction and the connection disconnection instruction is a home cell to which an access right is given to the mobile station UE # 1.

  The RRC connection setting processing unit 14 is configured to set an RRC connection with the radio access network device 10.

  Specifically, when a predetermined trigger is detected by the trigger detection unit 11 while the mobile station UE # 1 is waiting in the macro cell #A, the RRC connection setting processing unit 14 instructs the radio access network device 10 to It is configured to establish an RRC connection with the radio access network device 10 by transmitting a connection setting request (RRC Connection Request) including predetermined information.

  Here, the predetermined information is an information element included in the connection setting request (RRC Connection Request), and is an information element such as “Cause: home cell change”, for example.

  Instead of notifying the radio access network device 10 of the predetermined information by the connection setting request (RRC Connection Request), the RRC connection setting processing unit 14 does not send the location registration processing unit 14 to the location registration request (Initial Direct Transfer). ) May notify the predetermined information.

  In addition, the RRC connection setting processing unit 14 is configured to disconnect the RRC connection in response to a connection disconnection instruction (RRC Connection Release) received from the radio access network device 10.

  The measurement unit 15 measures the reception quality of the broadcast information in the home cell # a1 included in the measurement control information (Measurement Control) received from the radio access network apparatus 10, and notifies the radio access network apparatus 10 of the measurement result. It is configured as follows.

  Note that the measurement unit 15 starts the standby in the home cell # a1, and after the predetermined period has elapsed or after a predetermined operation by the user has been performed, notification information in cells other than the home cell # a1 The reception quality may not be measured.

  As shown in FIG. 3, the radio access network device 10 includes an RRC connection setting processing unit 21 and a measurement control unit 22. For example, the radio access network device 10 is configured by a radio control device such as a radio network controller RNC or a radio base station accommodating device.

  The RRC connection setup processing unit 21 is configured to establish an RRC connection with the mobile station UE # 1 in response to a connection setup request (RRC Connection Request) transmitted by the mobile station UE # 1. Yes.

  In addition, when the RRC connection setup processing unit 21 receives a measurement result (Measurement Report) including the reception quality of broadcast information in the home cell # a1 from the mobile station UE # 1, the RRC connection setup processing unit 21 It is configured to transmit a standby cell change instruction and a connection disconnection instruction (RRC Connection Release) instructing to disconnect the RRC connection and start standby in the home cell # a1.

  The measurement control unit 22 sends measurement control information (Measurement Control) including the home cell # a1 to which the mobile station UE # 1 has access rights to the mobile station UE # 1 via the RRC connection. Configured to send.

  For example, when receiving a connection setting request (RRC Connection Request) including predetermined information or a location registration request (Initial Direct Transfer) including predetermined information, the measurement control unit 22 receives a mobile station UE # from the core network device 20. 1 is acquired, information related to the home cell # a1 to which the access right is given is acquired, and measurement control information (Measurement Control) including the acquired home cell # a1 is transmitted.

  Here, the radio access network apparatus 10 gives the access right to the mobile station UE # 1 via the RRC connection by a method other than the measurement control information (Measurement Control) to the mobile station UE # 1. The home cell # a1 may be notified.

  As shown in FIG. 4, the core network device 20 includes an access information management unit 31 and a location registration processing unit 32. For example, the core network device 20 is configured by an exchange SGSN or the like.

  The access information management unit 31 is configured to manage a home cell (home cell radio base station) to which an access right is given to each mobile station UE. For example, as shown in FIG. 5, the access information management unit 31 uses “mobile station ID” that is identification information of each mobile station and identification information of a home cell to which the access right is given to the mobile station. A certain “access-permitted home cell ID” is associated and stored.

  Here, the home cell (home cell radio base station) to which the access right is given to each mobile station UE may be managed in the radio access network 10 instead of the core network device 20.

(Operation of the mobile communication system according to the first embodiment of the present invention)
With reference to FIG.6 and FIG.7, operation | movement of the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  First, with reference to FIG. 6, an operation when the mobile communication system according to the present embodiment successfully starts standby in the home cell will be described.

  As illustrated in FIG. 6, when the mobile station UE # 1 detects a predetermined trigger while waiting in the macro cell #A in step S1000, the mobile station UE # 1 notifies the radio access network apparatus 10 in “Cause: home cell” in step S1001. “RRC Connection Request” including the information element “change” is transmitted.

  In step S1002, the radio access network apparatus 10 transmits “RRC Connection Setup” to the mobile station UE # 1 in response to the received “RRC Connection Request”.

  In step S1003, the mobile station UE # 1 transmits “RRC Connection Setup Complete” to the radio access network device 10 in response to the received “RRC Connection Setup”. Here, an RRC connection is established between the mobile station UE and the radio access network apparatus 10.

  Thereafter, in step S1004, the mobile station UE # 1 transmits “Initial Direct Transfer” to the core network device 20 via the established RRC connection.

  In response to “Initial Direct Transfer”, the core network device 20 transmits “Downlink Direct Transfer” to the mobile station UE # 1 in step S1005, and accesses the mobile station UE # 1 in step S1006. The home cell # a1 to which the right is granted is searched, and the searched home cell # a1 is notified to the radio access network apparatus 10 by “Location Reporting Control”.

  In step S1007, the radio access network device 10 transmits “Measurement Control” including the home cell # a1 notified by the core network device 20 to the mobile station UE # 1.

  Here, when the radio access network 10 manages a home cell to which an access right is given to each mobile station UE, the radio access network 10 is replaced with the home cell # a1 notified by the core network device 20. “Measurement Control” including the home cell # a1 to which the access right is given to the managed mobile station UE # 1 is transmitted to the mobile station UE # 1.

  In step S1008, the mobile station UE # 1 measures the reception quality of the broadcast information in the home cell # a1 included in the “Measurement Control” and includes the “Measurement Report” including the measurement result (detection of the home cell # a1). Is transmitted to the radio access network device 10.

  In step S <b> 1009, when receiving the “Measurement Report”, the radio access network device 10 transmits “Location Report” to the core network device 20.

  In step S1010, when the core network device 20 receives “Location Report”, the core network device 20 transmits “Iu Release Command” to the radio access network device 10.

  In step S1011, when receiving the “Iu Release Command”, the radio access network apparatus 10 transmits “RRC Connection Release” to the mobile station UE # 1.

  In step S1012, the mobile station UE # 1 transmits “RRC Connection Release Complete” to the radio access network device 10 in response to the received “RRC Connection Release”.

  In step S <b> 1013, the radio access network device 10 transmits “Iu Release Complete” to the core network device 20 in response to the received “RRC Connection Release Complete”.

  Thereafter, in step S1014, the mobile station UE # 1 starts standby processing in the home cell # a1, and performs location registration processing for the location registration area including the home cell # a1.

  2ndly, with reference to FIG. 7, the operation | movement when the start of the standby in a home cell fails in the mobile communication system which concerns on this embodiment is demonstrated.

  As shown in FIG. 7, the operations in steps S1001 to S1007 are the same as those shown in FIG.

  In step S2001, the core network device 20 has not received the “Location Report” within the predetermined period after transmitting the “Location Reporting Control”, or has received the “Location Report” indicating failure in home cell search. In step S2002, “Iu Release Command” is transmitted to the wireless access network device 10.

  In step S2003, when receiving the “Iu Release Command”, the radio access network apparatus 10 transmits “RRC Connection Release” to the mobile station UE # 1.

  In step S2004, the mobile station UE # 1 transmits “RRC Connection Release Complete” to the radio access network device 10 in accordance with the received “RRC Connection Release”.

  In step S2005, the radio access network device 10 transmits “Iu Release Complete” to the core network device 20 in response to the received “RRC Connection Release Complete”.

  In this case, the mobile station UE # 1 does not change the standby cell from “macrocell #A”, and therefore does not perform the location registration process.

  The characteristics of the present embodiment described above may be expressed as follows.

  A first feature of the present embodiment is a mobile communication method, in which a mobile station UE # 1 waiting in a macro cell #A detects a predetermined trigger and connects with the radio access network apparatus 10 ( RRC connection) is established in step A (steps S1001 to S1003), and the radio access network device 10 grants access rights to the mobile station UE # 1 via the connection to the mobile station UE # 1. A process B (step S1007) for notifying the home cell # a1 that is being notified, and a process C (step S1008) for the mobile station UE # 1 to measure the reception quality of the broadcast information in the notified home cell # a1 Is the gist.

  In the first feature of the present embodiment, in step A, the mobile station establishes a connection by transmitting a connection setting request (RRC Connection Request) including predetermined information (Cause: home cell change), and in step B Then, the radio access network device 10 may notify the mobile station UE # 1 of the home cell # a1 via the connection in response to the connection setting request.

  In the first feature of the present embodiment, in step B, the radio access network device 10 transmits measurement control information (Measurement Control) including the home cell # a1 to the mobile station UE # 1, and in step C, The mobile station UE measures the reception quality of the broadcast information in the home cell # a1 based on the measurement control information, and the mobile station UE # 1 sends a measurement result (Measurement Report) to the radio access network device 10. The notification process D (step S1008) and the radio access network device 10 instruct the mobile station UE # 1 to disconnect the connection according to the measurement result, and the standby cell change instruction and the connection disconnection instruction (RRC) A process to send Connection Release) E (step S1011), the mobile station UE, according to the cell change instruction and disconnection instruction waiting to disconnect the connection, may further include a step F to start the standby in the home cell # a1.

  In the first feature of the present embodiment, in step B, the mobile station UE # 1 may transmit a connection setting request including predetermined information in response to a predetermined operation by the user.

  In the first feature of the present embodiment, in step B, the mobile station UE # 1 may transmit a connection setting request including predetermined information when performing a location registration process for the macro cell #A.

  In the first feature of the present embodiment, in step F, the mobile station UE # 1 starts waiting in the home cell # a1, and then after a predetermined period of time or after a predetermined operation by the user is performed. If not, the reception quality of broadcast information in cells other than home cell # a1 need not be measured.

  The second feature of the present embodiment is the mobile station UE # 1, and when a predetermined trigger is detected while waiting in the macro cell #A, a connection setting request including predetermined information is sent to the radio access network device 10. And a connection setting processing unit 14 configured to establish a connection with the radio access network apparatus 10 and a home cell # a1 included in the measurement control information received from the radio access network apparatus 10 Measuring unit 15 configured to measure the reception quality of broadcast information and notify the radio access network device 10 of the measurement result, and the standby cell change instruction and connection disconnection instruction received from the radio access network device 10 Depending on the And summarized in that comprises a standby section 13 is configured to start camping on the cell.

  In the second feature of the present embodiment, the connection setting processing unit 14 may be configured to transmit a connection setting request including predetermined information in response to a predetermined operation by the user.

  In the second feature of the present embodiment, the connection setting processing unit 14 may be configured to transmit a connection setting request including predetermined information when performing a location registration process for the macro cell #A.

  A third feature of the present embodiment is the radio access network apparatus 10, which establishes a connection with the mobile station UE # 1 in response to a connection setting request including predetermined information received from the mobile station UE # 1 Measurement including the connection setting processing unit 21 configured to perform and the home cell # a1 to which the access right is granted to the mobile station UE # 1 via the connection to the mobile station UE # 1 The connection setting processing unit 21 receives a measurement result including the reception quality of broadcast information in the home cell # a1 from the mobile station UE # 1. The measurement control unit 22 is configured to transmit control information. In this case, the mobile station UE # 1 instructs the mobile station UE # 1 to disconnect the connection and start standby in the home cell # a1, and And summarized in that it is configured to transmit the Nekushon disconnection instruction.

(Operations and effects of the mobile communication system according to the first embodiment of the present invention)
According to the mobile communication system according to the first embodiment of the present invention, when a large number of home cells # a1 and # a2 exist in the macro cell #A, a large number of home cells are included in the neighboring cell information in the broadcast information. Even if the cells # a1 and # a2 are not included, the standby in the home cell # a1 can be performed.

  That is, according to the mobile communication system according to the first embodiment of the present invention, when a large number of home cells # a1 and # a2 exist in the macro cell #A, the macro cell #A has a large influence. The effective guidance to the home cell # a1 can be realized.

  Moreover, according to the mobile communication system which concerns on the 1st Embodiment of this invention, mobile station UE # 1 can be guide | induced to home cell # a1 by a minor function addition using the existing procedure.

(Example of change)
In the above embodiment, the W-CDMA mobile communication system has been described as an example. However, the present invention is not limited to such a mobile communication system. For example, the LTE (Long Term Evolution) system is used. The present invention can also be applied to other mobile communication systems.

  In this case, the function of the above-described radio access network apparatus 10 is mounted on the macro cell radio base station #A and the home cell radio base stations # a1 and # a2.

  The operations of the radio access network device 10, the core network device 20, and the mobile station UE described above may be implemented by hardware, may be implemented by a software module executed by a processor, or a combination of both. May be implemented.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a Hard Disk, a Registered ROM, a Hard Disk Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the radio access network device 10, the core network device 20, or the mobile station UE. Further, the storage medium and the processor may be provided as a discrete component in the radio access network device 10, the core network device 20, or the mobile station UE.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. FIG. 3 is a functional block diagram of a mobile station according to the first embodiment of the present invention. 1 is a functional block diagram of a radio access network device according to a first embodiment of the present invention. It is a functional block diagram of the core network apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the access information managed by the core network apparatus which concerns on the 1st Embodiment of this invention. FIG. 3 is a sequence diagram showing an operation of the mobile communication system according to the first embodiment of the present invention. FIG. 3 is a sequence diagram showing an operation of the mobile communication system according to the first embodiment of the present invention.

Explanation of symbols

UE ... mobile station 11 ... trigger detection unit 12, 32 ... location registration processing unit 13 ... standby processing unit 14, 21 ... RRC connection setting processing unit 15 ... measurement unit 10 ... radio access network device 22 ... measurement control unit 20 ... core network Device 31 ... Access information management unit

Claims (10)

When the mobile station waiting in the macro cell detects a predetermined trigger, the process A establishes a connection with the radio access network device via the macro cell;
Step B in which the radio access network device notifies the mobile station of a home cell to which an access right is granted to the mobile station via the connection;
The mobile communication method comprising: a step C in which the mobile station measures reception quality of broadcast information in the notified home cell. In the step A, the mobile station establishes the connection by transmitting a connection setting request including predetermined information,
2. The radio access network apparatus according to claim 1, wherein, in the step B, the radio access network apparatus notifies the home cell to the mobile station via the connection in response to the connection setting request. Mobile communication method. In the step B, the radio access network device transmits measurement control information including the home cell to the mobile station,
In the step C, the mobile station measures the reception quality of broadcast information in the home cell based on the measurement control information,
Step D in which the mobile station notifies the radio access network device of the measurement result;
The wireless access network device transmits a standby cell change instruction and a connection disconnection instruction to the mobile station according to the measurement result; and
The mobile communication according to claim 1, further comprising: a step F in which the mobile station disconnects the connection and starts standby in the home cell in response to a standby cell change instruction and a connection disconnection instruction. Method.   The mobile communication method according to claim 2, wherein in the step B, the mobile station transmits a connection setting request including the predetermined information in response to a predetermined operation by a user.   The mobile communication method according to claim 2, wherein, in the step B, the mobile station autonomously transmits a connection setting request including the predetermined information when performing a location registration process for a macro cell.   In the step F, after the mobile station starts waiting in the home cell, it is broadcast information in a cell other than the home cell unless a predetermined period has elapsed or a predetermined operation is performed by the user. 4. The mobile communication method according to claim 3, wherein the reception quality is not measured. When a predetermined trigger is detected while waiting in the macro cell, a connection is established with the radio access network apparatus by transmitting a connection setting request including predetermined information to the radio access network apparatus. Connection setting processing unit,
A measurement unit configured to measure reception quality of broadcast information in a home cell included in measurement control information received from the radio access network device, and to notify the measurement result to the radio access network device;
A standby processing unit configured to start standby in the home cell when the connection is disconnected in response to a standby cell change instruction and a connection disconnection instruction received from the radio access network device. A mobile station characterized by that.   The mobile station according to claim 7, wherein the connection setting processing unit is configured to transmit a connection setting request including the predetermined information in response to a predetermined operation by a user.   The mobile station according to claim 7, wherein the connection setting processing unit is configured to transmit a connection setting request including the predetermined information when performing a location registration process for a macro cell. A connection setting processing unit configured to establish a connection with the mobile station in response to a connection setting request including predetermined information received from the mobile station;
A measurement control unit configured to transmit to the mobile station, via the connection, measurement control information including a home cell to which an access right is granted to the mobile station; and
When the connection setting processing unit receives a measurement result including reception quality of broadcast information in the home cell from the mobile station, the connection setting processing unit disconnects the connection and waits in the home cell. A radio access network apparatus configured to transmit a standby cell change instruction and a connection disconnection instruction instructing to start.

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