JP5825664B2 - Relay device and relay method - Google Patents

Description

  The present invention relates to a relay apparatus and a relay method used in a mobile communication system, and more particularly to a relay apparatus and a relay method for relaying data from a mobile station to a base station while maintaining communication quality.

  In mobile communication systems, development of technology that can maintain a connection state with a base station even during high-speed movement is underway.

  Here, in a situation where there are many mobile stations that move together in the same direction, if the base station individually performs management control with each mobile station, the control signal from the mobile station will be instantaneous when the cell boundary is exceeded. There is a problem of increasing it.

  As a technique for solving such a problem, there is a mobile communication control system disclosed in Patent Document 1. In this communication method, a relay device is placed on a moving medium such as a bus or train, and the subscriber number of the mobile station possessed by the subscriber whose relay device appears in the moving medium when passing through the boundary of the location registration zone Are collectively reported to the control station via the base station. As described above, when the relay apparatuses collectively perform location registration, it is not necessary for the base station to perform location registration processing individually with each mobile station, and thus it is possible to prevent the control signal from increasing instantaneously.

JP-A-6-244780

  When a relay device is mounted on a mobile medium, it is preferable that the relay device relays not only control information but also normal communication data such as a call from the viewpoint of reducing power consumption of the mobile station and effective use of radio resources. .

  However, the transmission path quality between the relay apparatus and each mobile station is relatively stable because the relative position does not change, whereas the transmission path quality between the relay apparatus and the base station varies greatly.

  Here, when a large amount of data is sent from multiple mobile stations in a situation where radio resource allocation to the relay device is insufficient, the relay device cannot properly process the data and the call is interrupted. There was a possibility to do.

  In view of the above problems, an object of the present invention is to provide a relay apparatus and a relay method capable of relaying data from a mobile station while maintaining good communication quality in a mobile communication system.

  The relay device according to the present invention is a relay device that relays communication between a base station device and a plurality of mobile station devices, and includes a first communication unit that communicates with the plurality of mobile station devices, and the first communication unit. Determining means for determining priorities of a plurality of data received from the plurality of mobile station apparatuses; storage means for temporarily storing the plurality of data; and transmitting the plurality of data based on the determined priorities Determining means for determining an order; and second communication means for extracting data from the storage means according to the determined transmission order and transmitting the data to a base station.

  The relay method of the present invention is a relay method executed by a relay device that relays communication between a base station device and a plurality of mobile station devices, and is a first communication that communicates with the plurality of mobile station devices. A determination step for determining priorities of a plurality of data received from the plurality of mobile station apparatuses in the first communication step, a storage step for temporarily storing the plurality of data in a storage medium, and the determination A determination step of determining a transmission order of the plurality of data based on priority; and a second communication step of extracting data from the storage medium according to the determined transmission order and transmitting the data to a base station.

  ADVANTAGE OF THE INVENTION According to this invention, the relay station apparatus and the relay method which can relay the data from a mobile station, maintaining favorable communication quality in a mobile communication system can be provided.

1 is a conceptual diagram showing a configuration of a mobile communication system according to a first exemplary embodiment. 1 is a block diagram illustrating a specific configuration of a relay device according to a first embodiment; FIG. 6 is a block diagram illustrating a specific configuration of a relay device according to a second embodiment; It is a figure explaining the mode of the up direction encapsulation concerning Embodiment 2. FIG. It is a figure explaining the mode of the encapsulation of the down direction concerning Embodiment 2. FIG. FIG. 10 is a sequence diagram illustrating an upstream processing operation according to the second embodiment; FIG. 6 is a conceptual diagram showing a configuration of a mobile communication system according to a modification of the second embodiment. FIG. 10 is a sequence diagram showing a flow of processing at the time of position registration according to the second embodiment.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of mobile communication system 1000 according to the first embodiment.

  The mobile communication system 1000 includes a base station 100, a relay station 200, and a plurality of mobile stations 300a to 300m. Note that the relay station 200 is mounted on the mobile medium 10, and the mobile stations 300 a to 300 m are moving together with the mobile medium 10. Here, the moving medium 10 is specifically a vehicle such as a bus or a train. In addition to the relay station 200, the base station 100 performs direct wireless communication with the mobile station 300n under its control.

  FIG. 2 is a block diagram showing a specific configuration of relay station 200. The relay station 200 includes a mobile station communication unit 210, a priority determination unit 220, a storage unit 230, a communication control unit 240, and a base station communication unit 250.

  The mobile station communication unit 210 performs wireless communication with subordinate mobile stations 300a to 300m. When receiving the signal transmitted from the mobile station via the antenna, the mobile station communication unit 210 performs general reception processing such as matching processing, amplification processing, and filtering processing on the received signal, and then performs demodulation processing. And decryption processing. The decrypted data is output to the priority determination unit 220. Further, the mobile station communication unit 210 reads mobile station data temporarily stored in the storage unit 230 in accordance with control from the communication control unit 240, performs up-conversion after performing encoding processing and modulation processing on the data, General transmission processing such as amplification processing is performed, and wireless transmission is performed to the mobile station via the antenna.

  The priority determination unit 220 determines the priority of data input from the mobile station communication unit 210. Specifically, with reference to the priority information included in the header of the decoded data packet, the transmission order is determined so that the data transmitted from each mobile station is transmitted from data indicating a high priority. As the priority information, information such as TOS (Type of service) and DSCP (Differentiated services code point) included in the IP header can be used. The priority determination unit 220 determines the transmission order for a plurality of data transmitted from a plurality of mobile stations in the same frame using the priority information. The priority determination unit 220 outputs and stores the data to the storage unit 230 and notifies the communication control unit 240 of the transmission order. Similarly, the priority determination unit 220 refers to the priority information for the data packet addressed to the mobile station input from the base station communication unit 250 and determines the transmission order. The priority determination unit 220 notifies the communication control unit 240 of the determined transmission order and outputs each data to the storage unit 230.

  The storage unit 230 temporarily stores the data addressed to the base station and the data addressed to the mobile station output from the priority determination unit 220. The storage unit 230 is a so-called buffer, and the data addressed to the base station and the data addressed to the mobile station are extracted according to control from the communication control unit 250 and output to the base station communication unit 250 and the mobile station communication unit 210, respectively.

  The communication control unit 240 takes out the data temporarily stored in the storage unit 230 based on the transmission order notified from the priority determination unit 220, and performs control so as to transmit from the data with high priority. The communication control unit 240 outputs the extracted data to the base station communication unit 250 and the mobile station communication unit 210, respectively.

  Further, the communication control unit 240 receives a connection request from the mobile station and performs scheduling for assigning radio resources to each mobile station. Further, the base station is requested to allocate a necessary amount of radio resources according to the amount of data received from the mobile station or the amount of data waiting to be transmitted temporarily stored in the storage unit 230. In this way, when the amount of data stored in the storage unit 240 serving as a buffer exceeds a certain threshold, the communication control unit 240 transmits a radio resource allocation request, and the base station that has received the radio resource allocation request The used bandwidth is increased for the relay station in preference to the station.

  The base station communication unit 250 performs encoding processing and modulation processing on the data received from the communication control unit 240, and then performs transmission processing such as up-conversion and amplification processing, and the base station 100 transmits to the own station. And wirelessly transmit data using the assigned carrier. Here, when the mobile communication system adopts the adaptive modulation scheme, the communication unit 250 with respect to the base station performs coding processing and modulation processing at the coding rate and modulation scheme notified from the base station 100, respectively. .

  As described above, when receiving data from a plurality of mobile stations, the relay station apparatus according to Embodiment 1 of the present invention once decodes the data and confirms the priority of the data, and then transmits the data with high priority to the base station. . Therefore, even when the radio resources allocated from the base station 100 are not sufficient to transmit all data, the priority determination unit 220 determines the priority of each data, and the data is transmitted in an appropriate transmission order. Therefore, the required QoS can be satisfied.

  The priority determination unit 220 may calculate the allowable delay time of the data based on the received priority of each data, and notify the communication control unit 240 of the allowable delay time in addition to the transmission order. The communication control unit 240 may perform control so that data is extracted from the storage unit 230 and transmitted from the base station communication unit 250 so as to satisfy the permissible delay time. If the allowable delay time is written in the priority information included in the packet, the priority determination unit 220 may perform the control based on the allowable delay time. Further, the communication control unit 240 may determine the allowable delay time by specifying the data type from the priority information and referring to the allowable delay time management table in which the allowable delay time is summarized for each data type. .

  Here, when the frequency band allocated from the base station 100 is small, or when adaptive modulation is performed, the transmission path quality is poor, and the encoding process or the modulation process cannot be performed with a high encoding rate or a multi-level modulation scheme. In some cases, data cannot be sent within the allowable delay time. In this case, the communication control unit 240 may perform control to discard data that could not be transmitted within the allowable delay time. Since data exceeding the allowable delay time, such as call data, can be finally discarded even if it is transmitted, the radio resources between the base station 100 and the relay station 200 are effectively utilized by discarding within the relay station. can do.

  Further, the priority determination unit 220 determines the priority of the data based on the transmission source IP address, the transmission destination IP address, the used protocol, the port number, etc. of the data input from the mobile station communication unit 210. The transmission order may be determined. Further, the priority determination unit 220 may determine the priority by using the information included in the header of the extended MAC frame to determine the data transmission order.

  Further, the base station may perform scheduling for increasing the use bandwidth without waiting for an additional resource allocation request when the relay station moves between cells or recovers from an instantaneous disconnection due to jamming radio waves. Since communication between the relay station and the mobile station is continued even if a disconnection occurs between the moving relay station and the base station, data transmitted from a plurality of mobile stations is stored in the storage unit of the relay station. This is because a large amount may be accumulated.

  Also, if the transmission rate between the relay station and the mobile station is small and a bottleneck when transferring large-scale data, the base station forwards the transmission data to the relay station first. The transmission data may be stored. In this case, the relay station may include a second storage unit in addition to the above-described storage unit that functions as a buffer. In the relay station, when the transmission rate with the mobile station is low, the communication control unit stores the large-scale data transmitted from the base station in the second storage unit, according to the communication status with the mobile station. Data may be read from the second storage unit and transferred at any time.

(Embodiment 2)
The relay station apparatus according to the second embodiment is characterized in that it includes encapsulation means for newly encapsulating data. This will be described below with reference to the drawings. The blocks described in FIG. 1 are denoted by the same reference numerals, and a part of the description is omitted for the sake of clarification.

  FIG. 3 is a block diagram showing a configuration of relay station apparatus 500 according to the second embodiment.

  In addition to the function of the communication control unit 240, the communication control unit 540 includes a transmission order notified from the priority determination unit 220, a radio resource amount notified from the base station, untransmitted data remaining in the storage unit 230, Based on this, it is determined whether to transmit the data as it is or to encapsulate it. This is because the encapsulation of the control signal eliminates the overhead of the control signal and allows effective use of radio resources. If the communication control unit 540 determines to encapsulate as a result of the determination, the communication control unit 540 instructs the encapsulation processing unit 560 to encapsulate the corresponding data.

  The encapsulation processing unit 560 reads the data to be encapsulated from the storage unit 230 under the control of the communication control unit 540, aggregates the packets, encrypts the data, encapsulates the data, and then sends the data to the communication control unit 540. Output. The communication control unit 540 outputs the encapsulated data to the base station communication unit 250. The base station communication unit 250 transmits the data to the base station 100. Also, the encapsulation processing unit 560 receives the encapsulated data from the base station communication unit 250, releases the encapsulation, and outputs it to the priority determination unit 220.

  FIG. 4 is a conceptual diagram showing the state of uplink encapsulation. Each data transmitted from the mobile stations A to C is received by the relay station device 500, and priority determination and encapsulation determination are performed. Here, data addressed to X transmitted from mobile station A and data addressed to Z transmitted from mobile station C are collected into one capsule and transmitted to base station 400. On the other hand, the data addressed to Y sent from the mobile station B is not encapsulated and is transmitted alone as usual. When the base station 400 receives the encapsulated data, the base station 400 releases the encapsulation, separates the data, and outputs the data to the core network side.

  FIG. 5 is a conceptual diagram showing the state of encapsulation in the downstream direction. Each data addressed to the mobile stations A to C received from the core network side is subjected to priority determination and encapsulation determination in the base station 400. Here, data addressed to mobile station A and data addressed to mobile station B are collected in one capsule and transmitted to relay station apparatus 500. On the other hand, the data addressed to the mobile station C is not encapsulated and is transmitted alone as usual. When relay station apparatus 500 receives the encapsulated data, relay station apparatus 500 releases the encapsulation, separates each data, and transmits the data to each mobile station according to the priority.

  Note that the encapsulation described with reference to FIGS. 4 and 5 is an example, and data transmitted from three or more mobile stations may be encapsulated.

  Next, the flow of the encapsulation process will be described. FIG. 6 is a sequence diagram showing an upstream processing operation shown in FIG.

  First, data is transmitted from a plurality of mobile stations using a carrier assigned by the relay station device 500 for each frame S101a to S101c. Here, relay station apparatus 500 assigns communication carrier F1 to mobile station A, communication carrier F2 to mobile station B, and communication carrier F3 to mobile station C, and each mobile station uses the assigned carrier. Then, the data is transmitted to the relay station device 500.

  In relay station apparatus 500, mobile station communication section 210 demodulates and decodes the data received in S101 (S102), and priority determination section 220 determines the priority of each data (S103). Subsequently, the communication control unit 530 determines whether to encapsulate and transmit based on the amount of radio resources allocated by the base station 400 and the data stored in the storage unit 230 while waiting for transmission ( S104). At this time, communication control section 530 determines which data from which mobile station and data from which mobile station are to be transmitted in one capsule. If it is determined to encapsulate in S104, the communication control unit 530 instructs the encapsulation processing unit 560 to encapsulate the data, and the encapsulation processing unit 560 encrypts the target data and then transmits the transmission packet. The capsules are aggregated and encapsulated to generate a capsule whose destination is the base station 400 (S105).

  The base station communication unit 250 performs encoding processing and modulation processing on the encapsulated data received from the encapsulation processing unit 560 using a coding rate and a modulation scheme specified by the base station, and Data is transmitted using the more allocated communication carrier F0 (S106).

  When the received data is encapsulated, the base station 400 releases the encapsulation and separates it (S107), and transmits each separated data to the core network side (S108). Subsequently, the base station communication unit 250 transmits the data transmitted from the mobile station B that has not been encapsulated, to the base station 400. (S109). The base station 400 transmits the received data to the core network side (S110).

  As described above, the relay station apparatus according to the second embodiment transmits data after performing encapsulation according to necessity in addition to transmitting data received from a mobile station according to priority. Therefore, since the relay station apparatus can aggregate and transmit a plurality of packets, the overhead of the control signal can be eliminated, and radio resources can be used effectively.

  Note that the communication control unit 540 may determine whether to encapsulate the transmission data for transmission based on the packet size of the transmission data. The communication control unit 540 determines the packet size based on the header information of the transmission packet and the decoding result, determines to encapsulate and transmit a plurality of packets having a size smaller than a predetermined reference size, and notifies the encapsulation processing unit 560 To do. The encapsulation processing unit 560 reads a plurality of untransmitted packets notified from the communication control unit 540 from the recording unit 560 and encapsulates them as a payload of one packet.

  By adopting such a configuration, in the transfer delay caused by the difference between the used frequency bandwidth between the base station and the relay station and the used frequency bandwidth relay between the relay station and the mobile station, the voice data, etc. Wireless resources can be effectively utilized by combining small-sized packets and transmitting them as one packet.

  In the standard G.711 currently in operation, when voice is packetized at a cycle of 20 msec, the number of packets created per second is 50 pps, the required bandwidth per voice channel is 64 kbps, and the payload size is 160 bytes. In G.729, the number of packets created per second is 50 pps, the required bandwidth per audio channel is 8 kbps, and the payload size is 20 bytes. Here, when voice is converted to IP, 40 bytes are required as the overhead of layer 3 or higher, so the length of the voice packet is 200 bytes and 60 bytes, respectively, and the ratio of the overhead is very large. Therefore, when such a type of packet is received from the mobile station, the relay station can effectively utilize radio resources between the relay station and the base station by collecting the packets into one packet and transmitting the packet to the base station. it can.

  Note that the communication control unit 540 is configured to combine a plurality of packets within a range within an allowable delay time for a predetermined type of packet based on the data TOS and DSCP, and to transmit the combined packet. You may do it. The base station that is the opposite device recognizes the encapsulated packet based on the header information of the received packet, disassembles it, returns it to an individual packet, and performs subsequent management.

  The relay station may be configured to perform pseudo-encapsulation on transmission data and transmit the data. The base information of the transmission data is shared between the base station and the relay station in advance, and the relay station identifies the data as valid data from which unnecessary information such as address information and duplicated portions and zero padding are removed. The identification information is added and transmitted. That is, the relay station transmits header information of the packet to the base station using a dedicated interface provided between the base station and a predetermined size to the base station regarding small-sized packets that are periodically transmitted such as voice packets. It is temporarily stored in association with the identification information. After performing such processing, the relay station extracts the valid data portion from the voice packet sent from the mobile station, adds the identification information notified to the base station to the valid data, and transmits it as transmission data. Such processing may be performed by a communication control unit in the relay station, or a processing unit that performs the above processing may be provided separately. The base station that is the opposite device identifies the data from the identification information added to the received data, reads the header information that is transmitted separately from the relay station and temporarily stored in advance, and combines it with the effective data included in the received data Restore the original data. With such a configuration, overhead can be further reduced.

  Note that the relay station apparatus of the present invention may be configured to perform MIMO communication with a plurality of antennas as shown in FIG. By improving the communication rate between the base station device and the relay station device, it is possible to improve the processing delay and the reduction of the communication rate caused by relaying the relay station device.

  In addition, when each mobile station performs location registration, such as when the mobile medium in which the relay station device of the present invention is mounted exceeds the cell edge, the relay station device is configured to collectively perform the location registration. Also good.

  FIG. 8 is a sequence diagram showing a flow of processing at the time of location registration. Each base station broadcasts a search signal (S201), and when a mobile medium equipped with a relay station device enters a cell area covered by the base station, the relay station device detects the search signal (S202). The relay station apparatus requests location registration to the base station that detects the search signal (S203). By receiving the location registration request from the relay station device, the base station detects the relay station device (S204), performs location registration of the relay station device, and returns a location registration confirmation to the relay station device (S205).

  When the relay station apparatus receives the position registration confirmation from the base station, the relay station apparatus starts mobile station detection (S206). The relay station apparatus broadcasts the search signal with transmission power sufficient to cover the mobile medium using the same control channel as the control channel used by the base station for search (S207). The mobile station existing in the mobile medium detects the search signal transmitted from the relay station apparatus in S207 (S208).

  Each mobile station that has detected the search signal transmits a location registration request to the relay station device (S209). The relay station device detects the mobile station by receiving the location registration request transmitted from each mobile station (S210). When the relay station device detects the mobile station, it returns a location registration confirmation to each mobile station (S211). The relay station apparatus collects information on the mobile stations detected in S210 and transmits the information together with the location registration request to the base station apparatus (S212).

  The base station device separates the location registration requests of the plurality of mobile stations received together, and transmits the request to the upper station to perform location registration (S213). The base station apparatus returns a mobile station location registration confirmation, and the mobile station location registration is completed (S214). Location registration may be performed in such a procedure. The relay station device is installed in a good position for line-of-sight communication so that it can communicate well with the base station device, and is equipped with a more sensitive antenna and high-quality amplifier. A new base station device can be acquired earlier than the position station. Therefore, while requesting location registration for the base station apparatus, a search is performed for the mobile station in the mobile medium to detect the mobile station. Then, the location registration is performed for the mobile stations under its control detected by the relay station device. Therefore, since each mobile station that has received a search signal from the base station does not perform location registration, the relay station device performs location registration collectively, so the control signal transmitted from the mobile station to the base station increases instantaneously. Wireless resources can be used effectively. In addition, since the relay station apparatus searches for the mobile station using the same control channel as the base station apparatus, it is not necessary to prepare a dedicated control channel for the relay station, and the conventional mobile station terminal can be used as it is. Can do.

  As described above, according to the present invention, since data is transmitted in consideration of the priority of data received from a plurality of mobile stations in the relay device, the transmission quality is poor between the base station and the relay station. Even if it exists, it is possible to relay data while maintaining a certain quality. Furthermore, a configuration for determining whether to combine and encapsulate a plurality of data based on data priority, data waiting for transmission remaining in the storage unit, and other radio resources allocated from the base station to the own station, and By doing so, the overhead of the control signal can be reduced.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, the following configuration can be adopted.

(1) A relay device that relays communication between a base station device and a plurality of mobile station devices, wherein the first communication unit communicates with the plurality of mobile station devices, and the first communication unit Determination means for determining priorities of a plurality of data received from the mobile station apparatus, storage means for temporarily storing the plurality of data, and determining a transmission order of the plurality of data based on the determined priorities A relay apparatus comprising: a determining unit; and a second communication unit that extracts data from the storage unit according to the determined transmission order and transmits the data to a base station.
(2) The relay device according to (1), wherein the determination unit determines the priority of data based on priority information included in a packet of received data.
(3) The relay device according to (1), wherein the determination unit determines an allowable delay time of the data and determines the transmission order so that the data is transmitted within the allowable delay time.
(4) The relay device according to (3), wherein the determination unit performs control to discard data that cannot be transmitted within the allowable delay time.
(5) further comprising an encapsulation means for encapsulating data;
The determination unit determines whether to perform the encapsulation on the plurality of data based on the priority of the plurality of data, and the encapsulation unit performs the determination on the data determined by the determination unit. The relay device according to any one of (1) to (4), wherein encapsulation is performed, and the second communication unit transmits the encapsulated data to the base station.
(6) The relay device according to (5), wherein the determination unit determines whether to perform encapsulation based on data temporarily stored in the storage unit and radio resources allocated by the base station .
(7) A relay method executed by a relay device that relays communication between a base station device and a plurality of mobile station devices, the first communication step for communicating with the plurality of mobile station devices; A determination step of determining priorities of a plurality of data received from the plurality of mobile station devices in a communication step; a storage step of temporarily storing the plurality of data in a storage medium; and the determination based on the determined priorities. A relay method comprising: a determination step of determining a transmission order of a plurality of data; and a second communication step of extracting data from the storage medium according to the determined transmission order and transmitting the data to a base station.

DESCRIPTION OF SYMBOLS 10 Mobile medium 100 Base station 200 Relay station 210 To mobile station communication part 220 Priority determination part 230 Storage part 240 Communication control part 240 Communication control part 250 To base station communication part 300 Mobile station 400 Base station 400 Base station apparatus 500 Relay station 540 Communication control unit 550 Encapsulation processing unit

Claims (6)

A relay device that relays communication between a base station device and a plurality of mobile station devices,
First communication means for communicating with the plurality of mobile station devices;
Determining means for determining priorities of a plurality of data received from the plurality of mobile station devices by the first communication means;
Storage means for temporarily storing the plurality of data;
Determining means for determining a transmission order of the plurality of data based on the determined priority;
A second communication means for transmitting to the base station apparatus takes out data from the storage means according to the transmission order of the determined,
Equipped with a,
The relay device is mounted on a moving medium and moves together with the plurality of mobile station devices,
When the amount of data stored in the storage unit exceeds a certain threshold, the relay device transmits a radio resource allocation request from the second communication unit to the base station device to increase the use bandwidth by the base station device. And
The relay device, when moving between cells, can increase the use bandwidth by the base station device without transmitting the radio resource allocation request,
Relay device. The determination means determines the priority of data based on priority information included in a packet of received data;
The relay device according to claim 1. The determining means determines an allowable delay time of the data, and determines the transmission order so as to transmit the data within the allowable delay time.
The relay device according to claim 1. The determination means performs control to discard data that cannot be transmitted within the delay allowable time.
The relay device according to claim 3. Further comprising an encapsulation means for encapsulating the data;
The determining means determines whether to perform encapsulation on the plurality of data based on the priority of the plurality of data,
The encapsulation means performs encapsulation on the data determined by the determination means,
The second communication means transmits the encapsulated data to the base station;
The relay device according to any one of claims 1 to 4. A relay method executed by a relay device that relays communication between a base station device and a plurality of mobile station devices,
A first communication step of communicating with the plurality of mobile station devices;
A determination step of determining priorities of a plurality of data received from the plurality of mobile station devices in the first communication step;
A storage step of temporarily storing the plurality of data in a storage medium;
A determination step of determining a transmission order of the plurality of data based on the determined priority;
A second communication step of transmitting to the base station apparatus takes out data from the storage medium according to the transmission order of the determined,
Equipped with a,
The relay device is mounted on a moving medium and moves together with the plurality of mobile station devices,
When the amount of data stored in the storage medium exceeds a certain threshold, a radio resource allocation request is transmitted to the base station device, and the use bandwidth can be increased by the base station device;
When moving between cells, the base station device can increase the use bandwidth without transmitting the radio resource allocation request; and
A relay method further comprising :

Images