JP6468564B2 - Wireless communication system and communication control method thereof - Google Patents

Description

  The present invention relates to a wireless communication system using a plurality of wireless technologies.

  In recent years, mobile communication has spread rapidly, and smart phones and tablet terminals equipped with cellular wireless communication and wireless LAN (Local Area Network) such as 3G (3rd Generation) and LTE (Long Term Evolution) are used. . Mobile communication will be further developed in the future, and one of the directions is HetNet (Heterogeneous Network) (see Non-Patent Document 1). This HetNet is not a single technology, but a system that forms a network by combining different technologies, wireless cells of various sizes, and various bands. Combining a plurality of radio technologies to form a HetNet is also called a Multi-RAT (Radio Access Technology) environment. FIG. 1 shows a state of a cell in a multi-RAT environment. In a macro cell 10, a small cell 20, a cell 30 using Wi-Fi (registered trademark), and a cell (millimeter wave or the like) 40 using a high frequency RAT are shown. An example is shown. In such an environment, the mainstream is that terminals and base stations use a plurality of radio technologies (RATs) and bands simultaneously to integrate communications.

  In order to integrate and use the traffic of a plurality of RATs, it is necessary to provide an integration point on the network, but a plurality of integration points can be considered. As shown in FIG. 2, as a method and technology for integration on the network, a form (FIG. 2 (c)) in which MPTCP (MultiPath Transmission Control Protocol) that integrates using a transport layer protocol is deployed in the server, An EPC on the network defined by MPGP Proxy for integration on the network (Fig. 2 (d)) or 3GPP (Third Generation Partnership Project), which is a standard technology for mobile communication (Evolved Packet Core) ePDG (evolved Packet Data Gateway), which is a seamless connection / integration technology of multiple RATs, a form of integration with SaMOG (S2a Mobility based on GTP) (FIG. 2 (c)), or a base station Dual Connectivity technology that integrates at the PDCP (Packet Data Convergence Protocol) layer is shown in FIG. a)) there.

  In these network integrations, an IP (Internet Protocol) packet to be transmitted to a plurality of RATs in an integration point node / protocol on the network is distributed by an internal scheduling function. FIG. 3 shows an operation image of the integration function unit implemented in a general integration node / protocol. The integrated function unit 50 has a transmission buffer 51, and transmission packets are temporarily stored in this buffer. In accordance with instructions from the scheduler 52, the packet control unit 53 distributes the transmission packets to the transmission paths, and the packets are transmitted to the transmission buffers 54 of the respective paths. Migrated. The remaining amount of the transmission buffer 54 corresponding to each path, that is, each RAT, network, or flow is monitored, and for the RAT (or network, flow) having a small remaining buffer amount, the distribution amount of 54 to the subsequent transmission buffer For example, the scheduler 52 determines the distribution amount, for example, by reducing the number of times. In addition, when a packet stored in the transmission buffer 54 is not transmitted for a certain period of time, control is performed to retransmit the packet in another RAT (or network or flow).

  When the scheduler of a node on the network controls the distribution amount, a specific problem occurs when wireless communication is used. Since the environment of wireless communication changes every moment unlike wired communication, it is necessary to allocate a distribution amount that follows the change. However, nodes on the network usually have no way of knowing changes in the wireless environment. Especially in the future HetNet environment, since the user moves, it becomes an environment where wireless cells having different characteristics (communication speed, cell size, frequency, etc.) are integrated and used while being added / deleted. Following this change is extremely important. If it is not possible to keep up with the change, it is necessary to perform control such that transmission does not proceed in a RAT that has been assigned with an inappropriate allocation, and re-transmission must be performed in another RAT. This leads to an increase in delay and jitter, and depending on the application, the user's QoE (Quality of Experience) is significantly deteriorated.

  As a means for a node on the network to acquire a change in the wireless environment, there are the following as conventional techniques. A method of extending the protocol of the transport layer and adding the predicted wireless throughput to the option field has been proposed as an IETF (Internet Engineering Task Force) Draft (see Non-Patent Document 2). Similarly, the applicant also extends the transport layer protocol to add information such as the RAT cell size to the packet, and adds the RAT request from the application to the transport layer option field. We are proposing a technology to communicate to the nodes of the network.

Jeanette Wannstrom, 1 other, "Heterogeneous Networks in LTE", [online], [searched January 6, 2016], Internet <URL: http: //www.3gpp.org/technologies/keywords-acronyms/1576 -hetnet> A. Jain, 5 others, "Mobile Throughput Guidance Inband Signaling Protocol", IETF, draft-flinck-mobile-throughput-guidance-03.txt, September 7, 2015, online], [January 6, 2016 Day search], Internet <URL: https: //tools.ietf.org/html/draft-flinck-mobile-throughput-guidance-03>

  The prior art enables the network node to acquire the wireless speed, cell radius, and wireless technology type in the HetNet environment, and to acquire the application transmission RAT request and perform scheduling. However, that alone is insufficient for optimal scheduling. That is, since the terminal communicates while moving, depending on the moving speed of the terminal, there is a possibility that even if the radio cell has a stable quality, the cell may go out of the cell relatively early if the cell radius is small. In this case, if traffic scheduling is performed for the RAT, retransmission is necessary and a delay occurs.

  For this reason, knowing the moving speed of the terminal and the estimated stay time of the discovered cell in advance, and determining the allocation allocation of the RAT based on the information leads to improvement in the quality of the user experience. However, at present, a node on the network is generally impossible unless a special communication path or means is set.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a radio communication system capable of performing optimal traffic integration in a Multi-RAT environment and a control method thereof.

  In order to achieve the above object, the present invention provides a plurality of radio base stations each forming a radio cell in a predetermined area, and a plurality of traffics routed through the plurality of radio cells formed by the plurality of radio base stations. In a wireless communication system including a wireless terminal device including a first integrated function unit that integrates and a second integrated function unit that integrates a plurality of traffics between the wireless terminal devices, the wireless terminal device includes a first wireless device. An expected stay time information calculating means for calculating expected stay time information of the wireless communication terminal in the second wireless cell when the second wireless cell is in the second area while being in the cell; The integrated function unit and the second integrated function unit calculate a distribution amount of transmission packets to each traffic based on the expected stay time information calculated by the expected stay time information calculating unit, and And performing allocation of transmission packets to each traffic based on the amount.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to improve a user's bodily sensation quality by controlling the allocation of the traffic between several RAT based on the estimated stay time information of a radio | wireless communication terminal. For example, when a small cell is found that moves at high speed, and the application has characteristics that hate delay and jitter, fine control such as not allocating a flow to the RAT becomes possible. .

Diagram explaining the Multi-RAT environment Diagram explaining traffic integration Integrated function block diagram The block diagram of the radio | wireless communications system which concerns on the 1st Embodiment of this invention The figure explaining an example of a functional structure of RAT DB which concerns on 1st Embodiment The figure explaining an example of the function structure of UE which concerns on 1st Embodiment The figure explaining an example of the function structure of the integration node which concerns on 1st Embodiment (example of the server which supported MPTCP) The figure explaining an example of a function structure of the integration node which concerns on 1st Embodiment (an example of MPTCP Proxy and a way apparatus) The figure explaining an example of the sequence in the radio | wireless communications system which concerns on 1st Embodiment The figure explaining the other example of the sequence in the radio | wireless communications system which concerns on 1st Embodiment Configuration example of MPTCP packet according to the first embodiment (when adding location information and wireless cell ID information) Configuration example of MPTCP packet according to the first embodiment (when expected stay time information is added to an MPTCP packet) The figure explaining an example of the sequence which UE which concerns on 1st Embodiment registers the result of stay time The flowchart explaining an example of the provision process of the expected stay time information which concerns on 1st Embodiment. The flowchart explaining an example of the update process of the expected stay time information which concerns on 1st Embodiment The figure explaining an example of the database structure of the data storage part which concerns on 1st Embodiment The figure explaining an example of the function structure of UE which concerns on 2nd Embodiment The figure explaining an example of a function structure of the radio base station which concerns on 2nd Embodiment The figure explaining an example of the sequence in the radio | wireless communications system which concerns on 2nd Embodiment The flowchart explaining an example of operation | movement of the wireless base station which concerns on 2nd Embodiment. The figure explaining an example of the database structure of the data storage part which concerns on 2nd Embodiment The figure explaining the radio | wireless communications system which concerns on 3rd Embodiment. The figure explaining an example of the function structure of UE which concerns on 4th Embodiment Configuration example of transport layer packet according to fourth embodiment (when moving speed information is added to option field)

(First embodiment)
A radio communication system according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a configuration diagram of the radio communication system according to the first embodiment.

  As shown in FIG. 4, the radio communication system according to the present embodiment includes a radio terminal (UE) 100, a plurality of radio base stations 200a and 200b, and networks 300a and 300b that accommodate the radio base stations 200a and 200b, respectively. And an integrated node 400 arranged at a location accessible from either network 300a, 300b. The wireless communication system according to the present embodiment further includes RAT DB 500 connected to integrated node 400.

  In the following description of the present application, when the plurality of radio base stations are collectively referred to, the suffix is simply omitted as “radio base station 200”. The same applies to other components (for example, a network).

  The radio base stations 200a and 200b form radio cells 201a and 201b by RAT, respectively. Here, the radio base station 200a and the radio base station 200b have different types and characteristics of RAT, and at least the sizes of the radio cells 201a and 201b formed by the radio base station 200a and the radio base station 200b are different. . Specifically, the radio cell 201a formed by RAT1 of the radio base station 200a includes part or all of the radio cell b formed by RAT2 of the radio base station 200b. Each wireless cell 201 can be identified by an ID (identification information). In the present embodiment, the case where there are two radio base stations 200 is illustrated, but the number is not limited to two, and more radio base stations 200 and radio cells 201 can be assumed.

  As the integration node 400, for example, a server supporting MPTCP, MPTCP Proxy, a GW (Gateway) device that integrates Wi-Fi (registered trademark) and mobile communication in a system such as ePDG or SaMOG defined by 3GPP, and Dual Connectivity are provided. There is an example of a base station device to perform. The integration node 400 is connected to the Internet 401 that is an external network.

  FIG. 5 shows an example of the functional configuration of the RAT DB. As shown in FIG. 5, the RAT DB 500 provides the expected stay time information of the UE 100 in each radio cell 201, and a data storage for storing the communication unit 510 and the expected stay time information of the UE 100 in each radio cell 201. Unit 520, and an expected stay time information management unit 530 that manages the update and acquisition of the expected stay time information of the storage unit 520. The expected stay time information includes an average value of connection times of UEs 100 connected to the radio base station 200 related to the radio cell 201 in the past, and a statistical value represented by a dispersion value of connection times. A storage form of the expected stay time information stored in the data storage unit 520 and a method of calculating the expected stay time information in the expected stay time information management unit 530 will be described later.

  FIG. 6 shows an example of the functional configuration of the UE. As shown in FIG. 6, the UE 100 includes a plurality of RAT I / F units 110a, 110b... Corresponding to different RATs, a communication protocol unit 120 located in an upper layer of the RAT I / F unit 110, and a communication protocol unit 120. An application unit 130 that is located in a higher layer and is a main communication body, and a location information acquisition unit 140 that acquires location information of the UE 100. The communication protocol unit 120 includes an integration function unit 121 that performs integrated control of a plurality of RAT traffic. As described above with reference to FIG. 3, the integration function unit 121 includes at least a scheduler (not illustrated) that performs scheduling of transmission packets. Examples of means by which the position information acquisition unit 140 acquires position information include satellite positioning systems such as GPS (Global Positioning System), and three-point surveying based on radio field intensity.

  FIG. 7 shows a configuration example of the integration node. FIG. 7 shows an example of a server that supports MPTCP. In this case, the integration node 400 includes an application unit 410, a communication protocol unit 420 located in a lower layer of the application unit 410, and a communication I / F unit 430 located in a lower layer of the communication protocol unit 420. The communication protocol unit 420 includes an integration function unit 421 that performs integrated control of traffic of a plurality of RATs, and a plurality of subflow management units 422a, 422b,. As described above with reference to FIG. 3, the integration function unit 421 includes at least a scheduler (not illustrated) that performs scheduling of transmission packets.

  FIG. 8 shows an example of an integration node using an example of MPTCP Proxy or a GW apparatus. In this case, the integrated node 400 includes a higher-level communication I / F unit 460, a communication protocol unit 420, and a plurality of lower-level communication I / F units 470a, 470b,. Here, the communication protocol unit 420 has the same function as the integration node 400 of FIG. In addition, although the case where there are a plurality of communication I / F units 470 on the lower side is illustrated, there may be a case where they are independent.

  Next, an example of the operation of the wireless communication system according to the present embodiment will be described with reference to the sequence diagrams of FIGS. 4 and 9 described above. Here, as shown in FIG. 4, the UE 100 is connected to a radio base station 200a related to RAT1 that forms a wide-area radio cell 201a, and communicates with the Internet 401 via the integration node 400. It is assumed that the UE 100 enters the area of another RAT2 radio cell 201b while moving.

  As shown in FIG. 9, in a situation where communication with the radio base station 200a forming the radio cell 201a is established (step S1), the UE 100 detects other broadcast signals related to RAT2 from the radio base station 200b. When the wireless cell 201b is found (steps S2 and S3), a wireless connection with the wireless base station 200b related to RAT2 is established, and flow integration is established with the integrated node 400 by integrating traffic from a plurality of RATs ( Steps S4 and S5).

  Next, the UE 100 acquires the current location information, and uses the acquired location information and the ID information of the discovered radio cell 201b as a radio channel (in this case, a communication channel with the radio base station 200a). ) To the integration node 400 (step S6). The integrated node 400 that has received the information transmits the ID information and location information to the RAT DB 500, and inquires about expected stay time information (step S7). Based on the location information of the terminal, the RAT DB 500 obtains expected stay time information when connected to the cell of the ID information from the data storage unit 520 (step S8), and replies to the integration node 400 (step S9). The integration node 400 transmits the acquired expected stay time information to the UE 100. The scheduler of the integrated node 400 uses the acquired expected stay time information to calculate a distribution amount (distribution ratio) for distributing the transmission packet to the UE 100 to each radio cell 201, and determines each transmission packet based on the calculated distribution amount. It controls to transmit to the radio base station 200 related to the radio cell 201 (step S10). Further, the integration node 400 transmits the expected stay time information to the UE 100 (step S11), and the UE 100 performs the same processing as the integration node 400 in the scheduler (step S12). In the present embodiment, the calculation of the allocation amount by obtaining the expected stay time information is performed when the radio cell 201 is discovered (substantially synonymous with the connection to the radio base station 200 related to the radio cell 201). It is a feature.

  The above processing can be applied regardless of the form of flow integration described above with reference to FIG. Next, an example in which MPTCP is used as a flow integration protocol will be described with reference to FIG.

  In this case, in the sequence of FIG. 9, as the flow integration establishment process in step S5, the MP_JOIN subtype packet is transmitted to start the flow integration (step 25). In this example, the location information and the ID information of the wireless cell 201 are added to the MP_JOIN subtype packet and transmitted. In addition, it is conceivable that the expected stay time information response is added to the ACK subtype packet and transmitted (step S30). FIG. 11 shows an example of a packet configuration when position information and ID information of the wireless cell 201 are added to an MPTCP packet. FIG. 12 shows an example of a packet configuration when expected stay time information is added to an MPTCP packet.

  Next, the procedure in which the UE registers the result of the stay time will be described with reference to FIG. As shown in FIG. 13, when the UE 100 leaves the radio cell 201b (step S41), at the timing when the integration node 400 finishes the flow integration (step S42), the location information at the start of connection of the UE 100, the radio cell 201b ID information and the staying time in the wireless cell 201b are reported to the RAT DB 500 (step S43). The expected stay time information management unit 530 of the RAT DB 500 calculates a statistical value such as an average stay time based on the acquired information, and updates the expected stay time information stored in the data storage unit 520 with the calculation result (step S44). ).

  FIG. 14 illustrates a flowchart of a process for providing expected stay time information in the expected stay time information management unit of the RAT DB. FIG. 15 illustrates a flow of updating the expected stay time information in the expected stay time information management unit 530 of the RAT DB.

  By the operation as described above, the UE 100 and the integration node 400 can acquire the expected stay time information based on the history of the UE 100 that has used the radio cell 201 in the past from the position at the location where the radio cell 201 was found. Further, when the use of the wireless cell 201 is finished, the history can be added to the RAT DB 500 and the data can be updated. There are places where the user's movement route has a high correlation with the history depending on the geographical position and the building to some extent, and the accuracy with which the expected stay time is hit is high in such a place.

  Based on such expected stay time information, the schedulers of the integration function units 121 and 421 in the integration node 400 and the UE 100 can change the packet distribution algorithm. As an example, if the expected stay time is equal to or less than a predetermined value, a scheduler implementation characterized by not distributing packets to the route to the RAT can be considered.

  FIG. 16 shows an example of the database structure of the data storage unit 520 of the RAT DB 500. A certain geographical range centering on the radio base station 200 is divided into a grid by latitude and longitude. For each grid, the expected stay time information such as average stay time and dispersion value when connection is started in the wireless cell is stored. For example, the grid size may be several meters. The RAT DB 500 uses this database to answer the expected stay time from the average stay time. The variance value is used to determine the data bias of the average stay time. For example, when the variance value is higher than a certain value, it is considered that the stay time of the wireless cell is highly random, and the RAT DB may reply with special data indicating that the expected stay time cannot be predicted.

(Second Embodiment)
A radio communication system according to a second embodiment of the present invention will be described with reference to the drawings. This embodiment is different from the first embodiment in that UE location information is not used and in the past, UE connection time information is collected from a radio base station, not a UE. The overall configuration of the radio communication system according to the present embodiment is the same as that of the first embodiment described above with reference to FIG.

  As shown in FIG. 17, the UE 100 is equivalent to the UE 100 obtained by removing the location information acquisition unit 140 from the UE 100 according to the first embodiment. The configuration example of the integration node 400 is the same as that of the first embodiment.

  FIG. 18 shows a functional configuration of the radio base station. As illustrated in FIG. 18, the radio base station 200 includes a network function unit 210, a connection management unit 220 that corresponds to layer 3 and performs C-Plane processing, and a packet processing unit that corresponds to layer 3 and performs U-Plane processing. 230, a MAC unit 240 corresponding to layer 2, a wireless transmission unit 250 and transmission antenna 251 corresponding to layer 1, and a wireless reception unit 260 and reception antenna 261. In the present embodiment, the connection management unit 220 that performs C-Plane processing has a function of managing the connection time of the UE 100.

  Next, an example of the operation of the radio communication system according to the present embodiment will be described with reference to the sequence diagrams of FIG. 4 and FIG. Here, as shown in FIG. 4, the UE 100 is connected to a radio base station 200a related to RAT1 that forms a wide-area radio cell 201a, and communicates with the Internet 401 via the integration node 400. It is assumed that the UE 100 enters the area of another RAT2 radio cell 201b while moving.

  As shown in FIG. 19, in a situation where communication with the radio base station 200a forming the radio cell 201a is established (step S51), the UE 100 detects other broadcast signals related to RAT2 from the radio base station 200b. When the wireless cell 201b is found (steps S65 and S53), a wireless connection with the wireless base station 200b related to RAT2 is established, and flow integration is established with the integrated node 400 by integrating traffic from a plurality of RATs ( Steps S54 and S55).

  Next, the UE 100 transmits the ID information of the discovered radio cell 201b to the integration node 400 via the already established radio channel (in this case, the communication channel with the radio base station 200a) (step S56). ). The integrated node 400 that has received the information transmits the ID information to the RAT DB 500 and inquires about expected staying time information (step S57). The RAT DB 500 acquires the expected stay time information when connected to the cell of the ID information from the data storage unit 520 (step S58), and replies to the integration node 400 (step S59). The integration node 400 transmits the acquired expected stay time information to the UE 100. The scheduler of the integrated node 400 uses the acquired expected stay time information to calculate a distribution amount (distribution ratio) for distributing the transmission packet to the UE 100 to each radio cell 201, and determines each transmission packet based on the calculated distribution amount. It controls to transmit to the radio base station 200 related to the radio cell 201 (step S60). In addition, the integration node 400 transmits the expected staying time information to the UE 100 (Step S61), and the UE 100 performs the same processing as that of the integration node 400 (Step S62). In the present embodiment, the calculation of the allocation amount by obtaining the expected stay time information is performed when the radio cell 201 is discovered (substantially synonymous with the connection to the radio base station 200 related to the radio cell 201). It is a feature.

  Next, a procedure for the wireless base station to calculate, hold, and report to the RAT DB the average stay time that is the expected stay time information will be described with reference to FIG. When the UE 100 leaves the radio cell 201b (step S71), when the radio communication of the radio base station 200 is terminated, the connection management unit 220 of the radio base station 200 determines the average stay time of the UE 100 of the radio base station 200, The variance value is updated and held (step S72). The radio base station periodically reports the average stay time and the variance value to the RAT DB 500 (step S73). The expected stay time information management unit 530 of the RAT DB 500 updates the expected stay time information stored in the data storage unit 520 based on the acquired information (step S44).

  Through the operation as described above, the UE 100 and the integration node 400 can acquire the expected stay time information based on the history of the UE 100 at the position where the radio cell 201 is found. Further, when the use of the wireless cell 201 is finished, the history can be added to the RAT DB 500 and the data can be updated.

  Based on such expected stay time information, the schedulers of the integration function units 121 and 141 in the integration node 400 and the UE 100 can change the packet distribution algorithm. As an example, if the expected stay time is equal to or less than a predetermined value, a scheduler implementation characterized by not distributing packets to the route to the RAT can be considered.

  FIG. 21 shows an example of the database structure of the RAT DB in this embodiment. The average stay time and the variance value are stored in a table for each ID of each wireless cell 201. The RAT DB uses this database to answer the expected stay time from the average stay time. The variance value is used to determine the data bias of the average stay time. For example, when the variance value is higher than a certain value, it is considered that the stay time of the wireless cell is highly random, and the RAT DB 500 may reply with special data indicating that the expected stay time cannot be predicted. Although this embodiment is inferior in accuracy compared to the first embodiment, it is possible to reduce signaling without the need for acquisition of location information by the UE 100, and management of expected stay time information for each location information also in the RAT DB 500 There is an advantage that there is no need.

(Third embodiment)
A radio communication system according to a third embodiment of the present invention will be described with reference to the drawings. The difference between the present embodiment and the first embodiment is that the moving speed is used instead of the UE position information. The overall configuration of the radio communication system according to the present embodiment is the same as that obtained by removing RAT DB 500 from the first embodiment described above with reference to FIG.

  As shown in FIG. 23, the UE 100 is the same as that having the moving speed acquisition unit 190 while removing the position information acquisition unit 140 from the UE 100 of the first embodiment. The configuration example of the integration node 400 is the same as that of the first embodiment.

  An operation image of the radio communication system according to the present embodiment will be described with reference to FIG. The UE 100 measures its own moving speed internally and notifies the integrated node 400 of the moving speed information. As a notification method, a method of notifying by dedicated signaling or a method of adding movement speed information to an option field of a transport layer of a packet transmitted from the UE 100 to the integration node 400 and transmitting the information is read by the integration node 400. The method of notifying by this is mentioned. FIG. 24 shows a configuration example of a packet when moving speed information is added to the option field of the transport layer. The scheduler of the integrated node 400 calculates the expected stay time by using the moving speed information and the separately obtained size information of the radio cell, and uses this expected stay time to send a transmission packet to the UE 100 to each radio cell 201. A distribution amount (distribution ratio) to be distributed to the wireless base station 200 is calculated, and transmission packets are controlled to be transmitted to the radio base station 200 related to each radio cell 201 based on the calculated distribution amount. In addition, as a method for acquiring the radio cell size information, for example, a method in which the radio cell size information is described in a header portion of a transport layer packet can be cited.

  As mentioned above, although the 1st-3rd embodiment of this invention was explained in full detail, this invention is not limited to this. For example, the mounting position and mounting form of each means (including the acquisition position of information necessary for calculation) necessary for the calculation process of the expected stay time information, the communication path used for exchanging various information including the expected stay time information, etc. Various modifications are conceivable depending on the network configuration and traffic integration mode. That is, as long as the expected staying time information can be acquired by the integrated processing unit that performs the traffic integrating process, the mounting form is not limited.

  Moreover, in the said embodiment, although average stay time, a variance value, etc. were illustrated as expected stay time information, other statistical values, such as another median and mode value, may be used, and also geographical information The calculation method and algorithm are not required, such as calculating the expected stay time taking into account the time characteristics and the like.

100 ... UE (wireless terminal)
121 ... Integrated function unit 200 ... Radio base station 201 ... Wireless cell 300 ... Network 400 ... Integrated node 421 ... Integrated function unit 500 ... RAT DB
520 ... Data storage unit 530 ... Expected stay time information management unit

Claims (7)

A radio terminal comprising a plurality of radio base stations each forming a radio cell in a predetermined area and a first integration function unit for integrating a plurality of traffics routed through a plurality of radio cells formed by the plurality of radio base stations In a wireless communication system comprising a device and a second integration function unit that integrates a plurality of traffics between the wireless terminal device,
Expected stay time information calculating means for calculating expected stay time information of the wireless communication terminal in the second wireless cell when the wireless terminal device is in the second wireless cell while being in the first wireless cell. ,
The first integrated function unit and the second integrated function unit of the wireless terminal device calculate a distribution amount of transmission packets to each traffic based on the expected stay time information calculated by the expected stay time information calculating unit, and A wireless communication system, characterized in that transmission packets are distributed to each traffic based on a distribution amount. The first integrated function unit and the second integrated function unit of the wireless terminal device pass through the second wireless cell when the expected stay time information calculated by the expected stay time information calculating unit is equal to or less than a predetermined threshold. The wireless communication system according to claim 1, wherein an amount of transmission packets allocated to traffic to be transmitted is set to zero. The expected stay time information calculating means includes storage means for storing the expected stay time information at each position in the radio cell for each radio cell,
The wireless terminal device includes position information acquisition means for acquiring current position information, and the position information and the identification information of the second wireless cell are detected as expected stay time information calculation means upon detection of being located in the second wireless cell. Send
3. The wireless communication according to claim 1, wherein the expected stay time information calculating unit calculates expected stay time information based on position information acquired from the wireless terminal device and identification information of a second wireless cell. system. 4. The wireless communication according to claim 3, wherein a predetermined area in the wireless cell centered on the wireless base station is geographically divided into grids, and predicted staying time information is stored in a storage unit for each grid. 5. system. The expected stay time information calculating means includes storage means for storing the expected stay time information for each radio cell,
The wireless communication system according to claim 1, wherein the expected stay time information calculating unit calculates expected stay time information based on identification information of the second wireless cell acquired from the wireless terminal device. The wireless terminal device includes a traveling speed acquisition unit that acquires the traveling speed of the wireless terminal device, and transmits the traveling speed to the expected staying time information calculating unit while being in the second wireless cell;
The wireless communication system according to claim 1, wherein the expected stay time information calculating unit calculates expected stay time information based on a moving speed acquired from the wireless terminal device. A radio terminal comprising a plurality of radio base stations each forming a radio cell in a predetermined area and a first integration function unit for integrating a plurality of traffics routed through a plurality of radio cells formed by the plurality of radio base stations A communication control method in a wireless communication system comprising a device and a second integration function unit that integrates a plurality of traffics between the wireless terminal device,
The expected staying time information calculating means calculates the expected staying time information of the wireless communication terminal in the second wireless cell when the wireless terminal device is in the first wireless cell and further in the second wireless cell. ,
The first integrated function unit and the second integrated function unit of the wireless terminal device calculate the distribution amount of transmission packets to each traffic based on the expected stay time information calculated by the expected stay time information calculating unit, and A communication control method in a radio communication system, characterized in that a transmission packet is allocated to each traffic based on a distribution amount.

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