JP2005124007A - Communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system which communicates by avoiding restrains on the CPU performance of a mobile station or a base station, and on hardware resources. <P>SOLUTION: When a mobile station 100 enters a communication area of a base station 200, it establishes a link with the base station 200, and a mobile station MRU sender 103 sends a mobile station MRU to the base station 200 without a break. Upon receipt of the mobile station MRU from the mobile station 100, an MRU comparator 204 in the base station 200 compares it with a base station MRU stored in a memory 202, an MTU determiner 205 determines the MTU as a determined MTU to be applied to the data transfer of an application to be executed from now, and sends the determined MTU to the mobile station 100. The mobile station 100 and the base station 200 transfer data of the application, using the MTU applied to the communication. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a communication system between a base station and a mobile station.

Conventionally, there has been a communication system of this type as described in Non-Patent Document 1, for example. A conventional communication system performs various services using a narrow band wireless communication technology used in ETC (automatic toll collection system) and the like using a communication protocol called an application sublayer. This application sub-layer realizes transmission / reception of large-capacity data, spontaneous data transmission from a mobile station, broadcast communication, and the like while maintaining compatibility with a communication standard in ETC.
“5.8G_DSRC Application Sublayer Detailed Technical Data (Draft)” 0.70 edition, Road New Industry Development Organization, published in March 2003, pages 3-21 to 3-27

  However, in the conventional communication system, the maximum transfer unit (MTU) in the application sublayer is a fixed value. Therefore, in an inexpensive mobile station or base station, a large amount of data is received from the partner station due to insufficient CPU performance or hardware resources. On the other hand, in a high-function mobile station or base station, the divided transfer must be performed in detail even though there is a margin in CPU performance and hardware resources. There was a problem that transfer efficiency was lowered due to overhead of information and the like.

  The present invention has been made to solve the conventional problems, and it is an object of the present invention to provide a communication system capable of communicating with a partner station while avoiding restrictions on CPU performance and hardware resources of a mobile station or base station. To do.

  The communication system of the present invention is a communication system including a base station and a mobile station that communicates with the base station, and the maximum transfer unit (MTU) that the mobile station and the base station can transfer in one data transfer process. ) Having a prescribed MTU set to the same value in advance, the base station and the mobile station each communicating with the other station, and the maximum receiving unit that can be received in one data reception process at each own station (MRU) each having a local station MRU, and at least one of the base station and the mobile station acquires a counterpart station MRU acquisition means for acquiring the counterpart station MRU that is the MRU of the counterpart station, and maximum transfer applied to communication MTU determination means for determining a unit, and the MTU determination means compares the MRU of the partner station acquired by the partner station MRU acquisition means with the local station MRU, and sets the smaller one as the determined MTU. It has formed.

  With this configuration, an appropriate determined MTU can be selected in accordance with the counterpart station MRU, and a communication system capable of communicating while avoiding restrictions on the CPU performance and hardware resources of the counterpart station can be provided.

Further, the communication system of the present invention includes a mobile station MRU transmitting unit that transmits a mobile station MRU that is a local station MRU in the mobile station, and a determined MTU receiving unit that receives a determined MTU determined by the base station. A mobile station MRU receiving means for receiving the mobile station MRU transmitted by the mobile station MRU transmitting means, an MTU determining means, and a determined MTU transmitting means for transmitting the determined MTU determined by the MTU determining means. When the mobile station MRU receiving means receives the mobile station MRU, the MTU determining means compares the received mobile station MRU with the base station MRU and sets the smaller one as the determined MTU. .

With this configuration, an appropriate determined MTU can be selected according to the mobile station MRU, and a communication system capable of performing communication while avoiding restrictions on the CPU performance and hardware resources of the mobile station can be provided.
The communication system of the present invention has a configuration in which the base station applies the specified MTU to communication when the mobile station MRU receiving means does not receive the mobile station MRU.

 With this configuration, even if the base station cannot receive the mobile station MRU, or even if there are mobile stations that do not have the function of transmitting the mobile station MRU in the communication system, normal communication is performed with the specified MTU. be able to.

The communication system of the present invention has a configuration in which the mobile station applies the specified MTU to communication when the determined MTU receiving unit does not receive the determined MTU.
With this configuration, even if the mobile station cannot receive the determined MTU, or even if some base stations of the communication system do not have a function of transmitting the determined MTU, normal communication can be performed with the specified MTU. it can.

 In the communication system of the present invention, the base station includes a base station MRU transmitting unit that transmits the base station MRU that is the local station MRU in the base station, and a determined MTU receiving unit that receives the determined MTU. A base station MRU receiving means for receiving the base station MRU transmitted by the base station MRU transmitting means, an MTU determining means for determining a maximum transfer unit to be applied to communication, and a determined MTU for transmitting the determined MTU determined by the MTU determining means When the base station MRU receiving means receives the base station MRU, the MTU determining means compares the received base station MRU with the mobile station MRU that is the local station MRU in the mobile station, and is small. This is a configuration in which one is determined as the MTU.

With this configuration, an appropriate determined MTU can be selected according to the base station MRU, and a communication system capable of performing communication while avoiding restrictions on the CPU performance and hardware resources of the base station can be provided.
The communication system of the present invention has a configuration in which the mobile station applies the specified MTU to communication when the base station MRU receiving means does not receive the base station MRU.

 With this configuration, even if the mobile station cannot receive the base station MRU, or if there is a base station that does not have the function of transmitting the base station MRU in the communication system, normal communication is performed with the specified MTU. be able to.

The communication system of the present invention has a configuration in which the base station applies the specified MTU to communication when the determined MTU receiving unit does not receive the determined MTU.
With this configuration, even if the base station cannot receive the determined MTU, or even if some mobile stations in the communication system do not have a function of transmitting the determined MTU, normal communication can be performed with the specified MTU. it can.

Furthermore, in the communication system of the present invention, the mobile station transmits a mobile station MRU that is a mobile station MRU in the mobile station, and a base station MRU that is the mobile station MRU in the base station that the base station has transmitted. A mobile station for receiving the mobile station MRU transmitted by the mobile station MRU transmission means, and a base station MRU reception means for determining the maximum transfer unit applied to communication. MRU receiving means, base station MRU transmitting means for transmitting base station MRU, and base station side MTU determining means for determining a maximum transfer unit applied to communication, wherein mobile station MRU receiving means receives mobile station MRU In this case, the base station side MTU determining means compares the received mobile station MRU with the base station MRU, and the smaller one is determined as the determined MTU, and the base station MRU receiving means is the base station MRU. If received, mobile station side MTU determination means has a base station MRU received, the configuration for comparing the mobile station MRU, and determines a smaller MTU.

  With this configuration, the base station and the mobile station can compare the own station MRU and the partner station MRU, respectively, and select an appropriate determined MTU, and can communicate without avoiding restrictions on the CPU performance and hardware resources of the partner station. A communication system can be provided.

  In the present invention, a mobile station and a base station each have a prescribed MTU that is set to the same value in advance, and each of the base station and the mobile station has its own station MRU that is the maximum reception unit in the own station, And at least one of the mobile stations includes a counterpart station MRU acquisition unit that acquires the counterpart station MRU of the counterpart station, and an MTU determination unit that determines a maximum transfer unit to be applied to communication. By comparing the counterpart station MRU acquired by the means and the own station MRU and setting the smaller one as the decision MTU, an appropriate decision MTU can be selected according to the MRU of the counterpart station, and the CPU performance and hardware of the counterpart station can be selected. It is possible to provide a communication system capable of communicating while avoiding resource constraints.

  Hereinafter, a communication system according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration diagram of a communication system according to a first embodiment of this invention.

  In FIG. 1, the communication system includes a mobile station 100 and a base station 200. The mobile station 100 communicates with a communication unit 101 that communicates with the base station 200 and a maximum transfer unit (MTU that can be transferred in one data transfer process). ) As a storage unit that stores a predetermined MTU that is set to the same value in advance with the base station 200 and a mobile station MRU that is a maximum reception unit (MRU) that can be received by the mobile station 100 in a single data reception process. 102, a mobile station MRU transmitting unit 103 that transmits the mobile station MRU stored in the storage unit 102 via the communication unit 101, and a determined MTU that receives the determined MTU transmitted from the base station 200 via the communication unit 101. The receiving unit 104 includes an application unit 105 that performs an application operation, and a control unit 106 that controls these units.

  On the other hand, the base station 200 is configured to receive a single data reception process in the base station 200 and the specified MTU that is set in advance to the same value between the communication unit 201 that communicates with the mobile station 100 and the mobile station 100. A storage unit 202 that stores a base station MRU as a reception unit (MRU), a mobile station MRU reception unit 203 that receives the mobile station MRU transmitted by the mobile station 100 via the communication unit 201, and a mobile station MRU reception unit 203 The MRU comparison unit 204 that compares the mobile station MRU received in step B and the base station MRU stored in the storage unit 202 and the MRU comparison unit 204 determine the MTU to be applied to communication with the mobile station 100 based on the comparison result. An MTU determining unit 205, a determined MTU transmitting unit 206 that transmits the determined MTU determined by the MTU determining unit 205 to the mobile station 100 via the communication unit 201, An application unit 207 that performs application operation, a control unit 208 which controls these units is configured to have a.

  About the communication system comprised as mentioned above, the operation | movement is demonstrated using FIGS.

First, a schematic operation between the mobile station 100 and the base station 200 will be described with reference to FIG. When the mobile station 100 enters the communication area of the base station 200 (S101), the mobile station 100 requests the base station 200 for a link in a predetermined transfer unit as a communication system of the present embodiment (S102). The base station 200 that has received the link request transmits the base station specific information to the mobile station 100 in a predetermined transfer unit as the communication system of the present embodiment (S103).

  The mobile station 100 that has received the base station specific information returns and transmits the mobile station specific information to the base station 200 to establish a lower layer link (S104). Next, the mobile station 100 transmits the mobile station MRU to the base station 200 (S105).

  When the base station 200 receives the mobile station MRU from the mobile station 100, the base station 200 compares the mobile station MRU with its own base station MRU, determines the MTU to be applied to the data transfer of the application to be performed as a determined MTU (S106), 100 (S107). The mobile station 100 and the base station 200 perform application data transfer using the MTU applied to the communication.

  Next, the operation of the mobile station using FIG. 3 and the operation of the base station using FIG. 4 will be described in detail.

  The mobile station 100 performs a series of operations such as a link request from the mobile station 100 to the base station 200, transmission of base station specific information from the base station 200 to the mobile station 100, and transmission of mobile station specific information from the mobile station 100 to the base station 200. When the lower layer connection is established (S201) and the lower layer connection of the base station 200 is established (S301), the mobile station MRU transmission unit 103 stores the mobile station MRU such as 256 octets stored in the storage unit 102, for example. Is transmitted to the base station 200 via the communication unit 101 (S202).

  When the mobile station MRU receiving unit 203 of the base station 200 receives the mobile station MRU transmitted from the mobile station 100 via the communication unit 201 (YES in S302), the MRU comparing unit 204 receives the mobile station called 256 octets. The MRU is compared with the base station MRU such as 1500 octets stored in the storage unit 202.

  When the value of the mobile station MRU is smaller (YES in S303), the MTU determination unit 205 determines 256 octets of the mobile station MRU as a determination MTU that is the MTU in the communication based on the result of the comparison by the MRU comparison unit 204. (S304). On the other hand, when the mobile station MRU received by the mobile station MRU receiving unit 203 has a value larger than 1500 octets of the base station MRU, for example, 1600 octets (NO in S303), the MTU determining unit 205 A value of 1500 octets is determined as the determined MTU (S305).

  The determined MTU transmission unit 206 transmits the determined MTU determined by the MTU determination unit 205 to the mobile station 100 via the communication unit 201 (S306). When the determined MTU receiving unit of the mobile station 100 receives the determined MTU transmitted by the base station via the communication unit 101 (YES in S203), the received determined MTU is set as the MTU of the communication (S204).

  After transmitting the mobile station MRU to the base station (S202), if the determined MTU has not been received within a predetermined time (NO in S203), a rule such as 522 octets stored in advance in the storage unit 102 The MTU value is set as the MTU of the communication (S205), and application data transfer is performed with the base station 200 using the set MTU (S206).

Also in the base station 200, the MTU determined by the MTU determination unit 205 is set as the MTU of the communication (S307). Alternatively, in the base station 200, after establishing a lower layer connection (S301), if the mobile station MRU receiving unit 203 does not receive the mobile station MRU within a predetermined time (NO in S302), A prescribed MTU value such as 522 octets stored in the storage unit 202 is set as the MTU of the communication (S308). Data transfer of the application is performed with the mobile station 100 using the set MTU (S309).

  According to such a communication system of an embodiment of the present invention, the mobile station 100 and the base station 200 have the prescribed MTU set to the same value in advance, and the mobile station 100 further includes the MRU in the mobile station 100. The base station 200 has a base station MRU that is an MRU in the base station 200. The base station 200 includes an MTU determination unit 205 that determines a maximum transfer unit to be applied to communication. When the station MRU receiving unit 203 receives the mobile station MRU, the MTU determining unit 205 compares the received mobile station MRU with the base station MRU, and sets the smaller one as the determined MTU, whereby the mobile station 100 Depending on the MRU, an appropriate determined MTU can be selected, and communication can be performed while avoiding restrictions on the CPU performance and hardware resources of the mobile station 100.

  In the above description, the mobile station MRU is 256 octets, or 1600 octets, the base station MRU is 1500 octets, and the specified MTU is 522 octets. However, other MRUs and MTU values can be similarly implemented. It is. Further, in the above description, the case where one MTU is determined between the base station and the mobile station has been described, but for each of a plurality of logical communication paths between the base station and the mobile station, Similarly, the negotiation procedure for selecting an appropriate determined MTU in the path can be implemented.

  In the above description, the case where one mobile station communicates with the base station has been described. However, even when there are a plurality of mobile stations, each mobile station performs the MTU negotiation procedure with the base station. It can be implemented in the same way.

  Next, the block diagram of the communication system of the 2nd Embodiment of this invention is shown in FIG. In FIG. 5, the configuration of mobile station 250 is the same as the configuration of base station 200 shown in FIG. 1, and the configuration of base station 150 is the same as the configuration of mobile station 100 shown in FIG. The operation will be described with reference to FIGS.

  First, a schematic operation between the mobile station 250 and the base station 150 will be described with reference to FIG. The time from when the mobile station 250 enters the communication area of the base station 150 (S151) to the mobile station specific information is transmitted to the base station 150 to establish a lower layer link (S154) according to the first embodiment (S101 ) To (S104). Next, the base station 150 transmits the base station MRU to the mobile station 250 (S155).

  When the mobile station 250 receives the base station MRU from the base station 150, the mobile station 250 compares the mobile station MRU with the mobile station MRU that the mobile station 250 has, determines an MTU to be applied to data transfer of an application to be performed as a determined MTU (S156), 150 is transmitted (S157). The mobile station 250 and the base station 150 perform application data transfer using the MTU applied to the communication.

  Next, the operation of the base station using FIG. 7 and the operation of the mobile station using FIG. 4 will be described in detail.

The base station 150 performs a series of operations such as a link request from the mobile station 250 to the base station 150, transmission of base station specific information from the base station 150 to the mobile station 250, and transmission of mobile station specific information from the mobile station 250 to the base station 150. When the lower layer connection is established (S251) and the lower layer connection of the mobile station 250 is established (S351), the base station MRU transmission unit 153 stores the base station MRU such as 256 octets stored in the storage unit 152, for example. Is transmitted to the mobile station 250 via the communication unit 151 (S252).

  When the base station MRU receiving unit 253 of the mobile station 250 receives the base station MRU transmitted from the base station 150 via the communication unit 251 (YES in S352), the MRU comparing unit 254 receives the received base station called 256 octets. The MRU is compared with the mobile station MRU stored in the storage unit 252 such as 1500 octets.

  When the value of the base station MRU is smaller (YES in S353), the MTU determination unit 255 determines 256 octets of the base station MRU as the determination MTU that is the MTU in the communication, based on the comparison result of the MRU comparison unit 254. (S354). On the other hand, when the base station MRU received by the base station MRU receiving unit 253 has a value larger than 1500 octets of the mobile station MRU, for example, 1600 octets (NO in S353), the MTU determining unit 255 A value of 1500 octets is determined as the determined MTU (S355).

  The determined MTU transmission unit 256 transmits the determined MTU determined by the MTU determination unit 255 to the base station 150 via the communication unit 251 (S356). When the determined MTU receiving unit of the base station 150 receives the determined MTU transmitted by the mobile station via the communication unit 151 (YES in S253), the received determined MTU is set as the MTU of the communication (S254).

  After transmitting the base station MRU to the mobile station (S252), if the determined MTU is not received within a predetermined time (NO in S253), a rule such as 522 octets stored in advance in the storage unit 152 The MTU value is set as the MTU of the communication (S255), and application data transfer is performed with the mobile station 250 using the set MTU (S256).

  Also in the mobile station 250, the MTU determined by the MTU determination unit 255 is set as the MTU of the communication (S357). Alternatively, in the mobile station 250, after establishing a lower layer connection (S351), if the base station MRU receiving unit 253 does not receive the base station MRU within a predetermined time (NO in S352), A prescribed MTU value such as 522 octets stored in the storage unit 252 is set as the MTU of the communication (S358). Data transfer of the application is performed with the base station 150 using the set MTU (S359).

  According to such a communication system of one embodiment of the present invention, the base station 150 and the mobile station 250 have the prescribed MTU set to the same value in advance, and the base station 150 further includes the MRU in the base station 150. The mobile station 250 has a mobile station MRU that is an MRU in the mobile station 250, and the mobile station 250 includes an MTU determination unit 255 that determines a maximum transfer unit to be applied to communication. When the station MRU receiving unit 253 receives the base station MRU, the MTU determining unit 255 compares the received base station MRU with the mobile station MRU, and sets the smaller one as the determined MTU, whereby the base station 150 In accordance with the MRU, an appropriate determined MTU can be selected, and communication can be performed while avoiding restrictions on the CPU performance and hardware resources of the base station 150.

In the above description, the base station MRU is 256 octets or 1600 octets, the mobile station MRU is 1500 octets, and the specified MTU is 522 octets. It is. Further, in the above description, the case where one MTU is determined between the base station and the mobile station has been described, but for each of a plurality of logical communication paths between the base station and the mobile station, Similarly, the negotiation procedure for selecting an appropriate determined MTU in the path can be implemented.

  In the above description, the case where one mobile station communicates with the base station has been described. However, even when there are a plurality of mobile stations, each mobile station performs the MTU negotiation procedure with the base station. It can be implemented in the same way.

  Next, FIG. 9 shows a configuration diagram of a communication system according to the third exemplary embodiment of the present invention. The operation will be described with reference to FIGS.

  First, a schematic operation between the mobile station 290 and the base station 190 will be described with reference to FIG. The time from when the mobile station 290 enters the communication area of the base station 190 (S191) to transmission of the link request (S192) are the same as (S101) to (S102) of the first embodiment. Next, the base station 190 transmits the base station MRU to the mobile station 290 (S193).

  When receiving the base station MRU from the base station 150, the mobile station 250 transmits the mobile station MRU to the base station 190 (S194). Next, the mobile station MRU is compared with the mobile station MRU that the mobile station MRU has, and the MTU to be applied to the application data transfer to be performed is determined as the determined MTU (S196).

  In addition, the base station 190 that has received the mobile station MRU compares the mobile station MRU with the base station MRU that the mobile station MRU itself has, and determines an MTU to be applied to data transfer of an application to be performed as a determined MTU (S195). The mobile station 290 and the base station 190 perform application data transfer using the MTU applied to the communication.

  Next, the operation of the base station using FIG. 11 and the operation of the mobile station using FIG. 12 will be described in detail.

  When the base station 190 receives a link request from the mobile station 290, the base station MRU transmission unit 198 transmits the base station MRU such as 256 octets stored in the storage unit 192 to the mobile station 290 via the communication unit 191 ( S292).

  When the base station MRU receiving unit 293 of the mobile station 290 receives the base station MRU transmitted from the base station 190 via the communication unit 291 (YES in S392), the mobile station MRU transmission unit 298 passes through the communication unit 291. The mobile station MRU is transmitted to the base station 190. The MRU comparison unit 294 compares the received base station MRU of 256 octets with the mobile station MRU such as 1500 octets stored in the storage unit 292.

  When the value of the base station MRU is smaller (YES in S394), the MTU determination unit 295 determines 256 octets of the base station MRU as the determination MTU that is the MTU in the communication based on the comparison result of the MRU comparison unit 294. (S396). On the other hand, when the base station MRU received by the base station MRU receiving unit 293 has a value larger than 1500 octets of the mobile station MRU, for example, 1600 octets (NO in S354), the MTU determining unit 295 A value of 1500 octets is determined as the determined MTU (S395).

  When the mobile station MRU receiving unit 193 of the base station 190 receives the mobile station MRU transmitted from the mobile station 290 via the communication unit 191 (YES in S293), the MRU comparing unit 194 receives the mobile station called 1500 octets. The MRU is compared with the base station MRU such as 256 octets stored in the storage unit 192.

  When the value of the base station MRU is smaller (YES in S294), the MTU determination unit 195 determines 256 octets of the mobile station MRU as the determination MTU that is the MTU in the communication, based on the result of the comparison by the MRU comparison unit 194. (S296). On the other hand, when the mobile station MRU received by the mobile station MRU receiving unit 293 has a value larger than 256 octets of the mobile station MRU, for example, 1500 octets (NO in S294), the MTU determining unit 195 Of 256 octets is determined as the determined MTU (S295).

  After transmitting the base station MRU to the mobile station (S292), if the mobile station MRU is not received within a predetermined time (NO in S293), it is stored in advance in the storage unit 192, for example, 522 octets The value of the prescribed MTU is set as the MTU of the communication (S298), and application data transfer is performed with the mobile station 290 using the set MTU (S299).

  Also in the mobile station 290, when the base station MRU receiving unit 293 does not receive the base station MRU within a predetermined time after transmitting the link request (NO in S392), it is stored in the storage unit 292 in advance, for example, A specified MTU value such as 522 octets is set as the MTU of the communication (S398). Data transfer of an application is performed with the base station 190 using the set MTU (S399).

  According to such a communication system of an embodiment of the present invention, the base station 190 and the mobile station 290 have the prescribed MTU set to the same value in advance, and the base station 190 further includes the MRU in the base station 190. The mobile station 290 has a mobile station MRU that is an MRU in the mobile station 290, and the base station 190 includes an MTU determination unit 195 that determines a maximum transfer unit to be applied to communication. The station 290 includes an MTU determination unit 295 that determines a maximum transfer unit to be applied to communication. When the base station MRU reception unit 193 receives the mobile station MRU, the MTU determination unit 295 By comparing with the station MRU and setting the smaller one as the determined MTU, an appropriate determined MTU can be selected according to the MRU of the base station 190. It is possible to communicate to avoid the constraints of CPU performance and hardware resources.

  In the above description, the base station MRU is 256 octets, or 1600 octets, the mobile station MRU is 1500 octets, and the specified MTU is 522 octets. However, other MRUs and MTU values can be similarly implemented. It is. Further, in the above description, the case where one MTU is determined between the base station and the mobile station has been described, but for each of a plurality of logical communication paths between the base station and the mobile station, Similarly, the negotiation procedure for selecting an appropriate determined MTU in the path can be implemented.

  In the above description, the mobile station determines the MTU after the mobile station transmits the mobile station MRU to the base station. However, the mobile station receives the base station MRU from the base station and determines the MTU first. Then, the mobile station MRU can be transmitted to the base station.

  In the above description, the case where one mobile station communicates with the base station has been described. However, even when there are a plurality of mobile stations, each mobile station performs the MTU negotiation procedure with the base station. It can be implemented in the same way.

  As described above, the communication system according to the present invention can select an appropriate determined MTU according to the MRU of the mobile station or according to the MRU of the base station, and the CPU performance or hardware of the mobile station or the base station can be selected. This is advantageous in that communication can be performed while avoiding restrictions on hardware resources, and is useful as a communication system between a base station and a mobile station.

The block diagram of the communication system in the 1st Embodiment of this invention FIG. 3 is a flowchart for explaining the schematic operation of the communication system according to the first embodiment of the present invention. FIG. 3 is a flowchart for explaining the operation of the mobile station in the communication system according to the first embodiment of the present invention. The flowchart for operation | movement description in the base station of the communication system in the 1st Embodiment of this invention The block diagram of the communication system in the 2nd Embodiment of this invention Flow chart for explaining the schematic operation of the communication system according to the second embodiment of the present invention. The flowchart for operation | movement description in the base station of the communication system in the 2nd Embodiment of this invention Flow chart for explaining the operation of the mobile station in the communication system according to the second embodiment of the present invention. The block diagram of the communication system in the 3rd Embodiment of this invention Flow chart for explaining schematic operation of the communication system in the third embodiment of the present invention. The flowchart for operation | movement description in the base station of the communication system in the 3rd Embodiment of this invention Flow chart for explaining the operation of the mobile station in the communication system according to the third embodiment of the present invention.

Explanation of symbols

100, 250, 290 Mobile station 101, 151, 191, 201, 251, 291 Communication unit 102, 152, 192, 202, 252, 292 Storage unit 103, 298 Mobile station MRU transmission unit 104, 154 Determined MTU reception unit 105, 155, 196, 207, 257, 296 Application unit 106, 156, 197, 208, 258, 297 Control unit 150, 190, 200 Base station 153, 198 Base station MRU transmission unit 193, 203 Mobile station MRU reception unit 194, 204 254, 294 MRU comparison unit 195, 205, 255, 295 MTU determination unit 206, 256 determination MTU transmission unit 253, 293 Base station MRU reception unit

Claims (18)

A communication system including a base station and a mobile station communicating with the base station,
The mobile station and the base station have a predetermined MTU set to the same value in advance as a maximum transfer unit (MTU) that can be transferred in one data transfer process,
Each of the base station and the mobile station has a communication means for communicating with a counterpart station, and a local station MRU that is a maximum reception unit (MRU) that can be received by a single data reception process in the local station. ,
At least one of the base station and the mobile station includes a counterpart station MRU acquisition unit that acquires a counterpart station MRU that is an MRU of the counterpart station, and an MTU determination unit that determines a maximum transfer unit to be applied to the communication, The communication system characterized in that the MTU determination means compares the counterpart station MRU acquired by the counterpart station MRU acquisition means with the local station MRU and sets the smaller one as the determined MTU. The mobile station comprises mobile station MRU transmitting means for transmitting a mobile station MRU that is the local station MRU in the mobile station, and determined MTU receiving means for receiving the determined MTU determined by the base station,
The base station includes a mobile station MRU receiving unit that receives the mobile station MRU transmitted by the mobile station MRU transmitting unit, the MTU determining unit, and a determined MTU transmitting unit that transmits the determined MTU determined by the MTU determining unit. With
When the mobile station MRU receiving means receives the mobile station MRU, the MTU determining means compares the received mobile station MRU with the base station MRU that is the local station MRU in the base station, and the smaller one The communication system according to claim 1, wherein the determined MTU is used. The communication system according to claim 2, wherein when the mobile station MRU receiving means does not receive the mobile station MRU, the base station applies the specified MTU to the communication. 4. The communication system according to claim 2, wherein, when the determined MTU receiving unit does not receive the determined MTU, the mobile station applies the specified MTU to the communication. As a maximum transfer unit (MTU) that can be transferred in one data transfer process, a predetermined MTU that is set in advance to the same value as that of another device and has a maximum reception unit that can be received in a single data reception process ( MRU), a mobile station MRU transmitting means for transmitting the mobile station MRU, a mobile station side communication means for communicating with the other apparatus, and the other apparatus for transmitting the mobile station MRU. If received, the received mobile station MRU is compared with the base station MRU that is the maximum reception unit of the other device, and the smaller one is determined as the determined MTU that is the maximum transfer unit applied to the communication, A mobile station comprising: a determined MTU receiving unit that receives the determined MTU transmitted from the other device. The mobile station according to claim 5, wherein when the determined MTU receiving unit does not receive the determined MTU, the prescribed MTU is applied to the communication. As a maximum transfer unit (MTU) that can be transferred in one data transfer process, a predetermined MTU that is set in advance to the same value as that of another device and has a maximum reception unit that can be received in a single data reception process ( A base station MRU, which communicates with the other device, a mobile station MRU receiving unit which receives the mobile station MRU transmitted by the other device, and applied to the communication An MTU determining means for determining a maximum transfer unit to be transmitted, and a determined MTU transmitting means for transmitting the determined MTU determined by the MTU determining means, and when the mobile station MRU receiving means receives the mobile station MRU, The base station characterized in that the MTU determination means compares the received mobile station MRU with the base station MRU and sets the smaller one as the determined MTU. 8. The base station according to claim 7, wherein when the mobile station MRU receiving means does not receive the mobile station MRU, the specified MTU is applied to the communication. The base station comprises base station MRU transmitting means for transmitting a base station MRU that is a local station MRU in the base station, and determined MTU receiving means for receiving the determined MTU,
The mobile station determines a base station MRU receiving unit that receives the base station MRU transmitted by the base station MRU transmitting unit, an MTU determining unit that determines a maximum transfer unit to be applied to the communication, and a transmission that determines the determined MTU. MTU transmission means,
When the base station MRU receiving means receives the base station MRU, the MTU determining means compares the received base station MRU with the mobile station MRU that is the local station MRU in the mobile station, and the smaller one The communication system according to claim 1, wherein the determined MTU is used. The communication system according to claim 9, wherein, when the base station MRU receiving means does not receive the base station MRU, the mobile station applies the specified MTU to the communication. The communication system according to claim 9 or 10, wherein, when the determined MTU receiving unit does not receive the determined MTU, the base station applies the specified MTU to the communication. As a maximum transfer unit (MTU) that can be transferred in one data transfer process, a predetermined MTU that is set in advance to the same value as that of another device and has a maximum reception unit that can be received in a single data reception process ( MRU), a base station MRU transmitting means for transmitting the base station MRU, a base station side communication means for communicating with the other apparatus, and the other apparatus for transmitting the base station MRU. If received, the received base station MRU is compared with the mobile station MRU which is the maximum reception unit of the other device, and the smaller one is determined as the determined MTU which is the maximum transfer unit applied to the communication, A base station comprising: a determined MTU receiving unit that receives the determined MTU transmitted from the other device. The base station according to claim 12, wherein when the determined MTU receiving unit does not receive the determined MTU, the prescribed MTU is applied to the communication. As a maximum transfer unit (MTU) that can be transferred in one data transfer process, a predetermined MTU that is set in advance to the same value as that of another device and has a maximum reception unit that can be received in a single data reception process ( MRU), a mobile station side communication means for communicating with the other apparatus, a base station MRU receiving means for receiving a base station MRU transmitted by the other apparatus, and applied to the communication An MTU determining means for determining a maximum transfer unit to be transmitted, and a determined MTU transmitting means for transmitting the determined MTU determined by the MTU determining means, and when the base station MRU receiving means receives the base station MRU, The mobile station characterized in that the MTU determination means compares the received base station MRU with the mobile station MRU and sets the smaller one as the determined MTU. The mobile station according to claim 14, wherein when the base station MRU receiving means does not receive the base station MRU, the prescribed MTU is applied to the communication. The mobile station transmits a mobile station MRU that is the local station MRU in the mobile station.
U transmitting means; base station MRU receiving means for receiving base station MRU which is the local station MRU in the base station transmitted by the base station; and mobile station side MTU determining means for determining a maximum transfer unit to be applied to the communication; With
The base station includes a mobile station MRU receiving unit that receives the mobile station MRU transmitted by the mobile station MRU transmitting unit, a base station MRU transmitting unit that transmits the base station MRU, and a maximum transfer unit that is applied to the communication. A base station side MTU determining means for determining,
When the mobile station MRU receiving means receives the mobile station MRU, the base station side MTU determining means compares the received mobile station MRU with the base station MRU, and sets the smaller one as the determined MTU.
When the base station MRU receiving means receives the base station MRU, the mobile station side MTU determining means compares the received base station MRU with the mobile station MRU, and the smaller one is determined as the determined MTU. The communication system according to claim 1. The communication system according to claim 16, wherein, when the base station MRU receiving means does not receive the base station MRU, the mobile station applies the specified MTU to the communication. The communication system according to claim 16 or 17, wherein, when the mobile station MRU receiving means does not receive the mobile station MRU, the base station applies the prescribed MTU to the communication.

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