JP5711547B2 - Wireless communication system, communication apparatus, control method therefor, and program - Google Patents

Description

  The present invention relates to a wireless communication system that changes a wireless communication setting when performing data transfer using a wireless communication path, a control method for a wireless communication system, and a program.

  A wireless communication network conforming to the IEEE802.11 series includes a wireless base station (AP, Access Point) that controls the network and a wireless terminal (MT, Mobile Terminal) as a controlled station. IEEE stands for Institute of Electrical and Electronic Engineers.

  In addition, IEEE 802.11n defines an aggregation that aggregates and transmits a plurality of packets. Patent Document 1 discloses a configuration in which whether or not to perform this aggregation is determined on the packet transmission side.

JP 2009-147786 A

  However, conventionally, it has not been possible to change the settings related to aggregation from the packet receiving side. For example, it has not been possible for the receiving side to perform processing for changing how many packets are aggregated and transmitted (hereinafter, the amount of packet aggregation) to the transmitting side.

  Therefore, data may continue to be transmitted with a packet aggregation amount that is inappropriate for the receiving side, and the receiving side buffer may become full. As a result, packet retransmission and loss may occur, resulting in a decrease in communication speed.

  In view of the above problems, it is an object to change the setting of the aggregation process according to the state change on the receiving side.

A wireless communication system according to the present invention that achieves the above-described object,
A wireless communication system comprising a plurality of wireless terminals and a wireless base station,
The radio base station is
Comprising a transmission means for aggregating a plurality of packets and transmitting them as one communication packet;
The wireless terminal is
Receiving means for receiving the communication packets aggregated and transmitted by the transmitting means;
As the operating state of the wireless terminal, the information amount of the communication packet stored in the buffer, the operation rate indicating the bus usage rate of the wireless terminal, or the communication between the wireless terminal and the wireless base station Detection means for detecting the type of communication protocol used or the number of communication sockets ;
When the communication packet aggregated from the radio base station to the radio terminal is transmitted by the transmission means, depending on the operating state of the radio terminal detected by the detection means, to the radio base station And a notification means for notifying the change of the aggregate amount of packets,
The radio base station is
The information processing apparatus includes a changing unit that changes the aggregate amount in response to the notification by the notification unit.

  According to the present invention, it is possible to change the setting of the aggregation process according to the state change on the receiving side. Thereby, even if the aggregation process currently being executed is continued, it is possible to suppress a decrease in throughput due to data loss or retransmission.

1 is a configuration diagram of a wireless communication system. The block diagram which shows the function structure of AP which concerns on this invention. The block diagram which shows the function structure of MT which concerns on this invention. The state management table of MT which concerns on this invention. The flowchart which shows the procedure of the process of MT which concerns on this invention. The flowchart which shows the procedure of processing of AP which concerns on this invention. The figure which shows the format of a MAC frame.

(First embodiment)
FIG. 1 shows a wireless communication system including a plurality of wireless terminals (hereinafter referred to as “MT (Mobile Terminal)”) and a wireless base station (hereinafter referred to as “AP (Access Point)”), and a wired terminal (hereinafter referred to as “AP”). This is a communication network according to the present embodiment connected to a wired communication system including “ND (Network Device)”.

  The AP 101 performs wireless connection with a plurality of MTs 102 and 103 to form a wireless network 104 for wireless communication, and also connects to a wired backbone network 105.

  The backbone network 105 is connected to the NDs 106 to 109 to form a wired network. Since the wireless network and the wired network are connected via the AP 101, communication between any MT and any ND is possible.

  With reference to FIG. 2, a functional configuration of an AP (radio base station) constituting the radio communication system according to the present invention will be described. The AP includes a processor 201, a memory controller 203, a memory 204, a clock / timer 205, a wired communication controller 206, a wireless communication controller 207, and a DMA controller 208. Each of these components is connected by the main bus 202.

  The processor 201 controls each component via the main bus 202. The memory controller 203 controls access to the memory 204 from each component. As a result, access such as read / write to / from the processor 201 to the memory 204 is possible. The memory 204 stores various data. The clock / timer 205 has a timer function for measuring a time interval by time information such as date and time and control from the processor 201. The clock / timer 205 can be accessed from the processor 201. The processor 201 has various communication protocol processing functions for executing communication processing, and acquires necessary time information from the clock / timer 205.

  The wired communication controller 206 has a MAC layer and a PHY layer mounted on the device, and can be connected to the Ethernet. The wired communication controller 206 is a communication interface for connecting to the backbone network 105.

  The wireless communication controller 207 is a communication interface that performs wireless connection with each MT 102 and MT 103 in the wireless network shown in FIG. The wireless communication controller 207 is configured by Host_IF (USB or SDIO or PCI or the like) that is connected to a wireless LAN module that complies with the IEEE 802.11 related standard. The wireless communication controller 207 has a function of controlling a control LSI mounted on the wireless LAN module according to an instruction from the processor 201. Aggregation processing for aggregating wireless packets defined in IEEE802.11n is performed by the processor 201 controlling a control LSI that performs wireless LAN control via the wireless communication controller 207. Alternatively, the processing may be executed by the processor 201 generating a communication packet subjected to aggregation processing and transmitting the communication packet to the control LSI via the wireless communication controller 207.

  The procedure for switching the communication standard being used is also executed by giving an instruction to the control LSI that performs wireless LAN control via the wireless communication controller 207 under the control of the processor 201. For example, a procedure for switching from a communication system compliant with IEEE 802.11n to a communication system compliant with another standard such as IEEE 802.11g can be executed.

  The DMA controller 208 transfers data via the main bus 202 between each component and the memory 204 according to the setting from the processor 201.

  Next, with reference to FIG. 3, a functional configuration of an MT (wireless terminal) configuring the wireless communication system according to the present invention will be described. The MT includes a processor 301, a memory controller 303, a memory 304, a clock / timer 305, a state detection unit 306, a wireless communication controller 307, and a DMA controller 308. Each of these components is connected by a main bus 302.

  The processor 301 controls each component via the main bus 302. The memory controller 303 controls access to the memory 304 from each component. As a result, it is possible to access the memory 304 such as read / write from / to the processor 301. The memory 304 stores various data. The clock / timer 305 has a timer function for measuring a time interval by time information such as date and time and control from the processor 301. The clock / timer 305 can be accessed from the processor 301. The processor 301 has various communication protocol processing functions for executing communication processing, and acquires necessary time information from the clock / timer 305. The clock / timer 305 also has a function of notifying timing information to the state detection unit 306 at a timer cycle set by the processor 301.

  The state detection unit 306 detects its own state such as the type of application being executed in the MT, the operating rate of the processor 301, and the free capacity of the reception buffer (the amount of information stored in the reception buffer). Further, it has a function of accessing the internal register of the DMA controller 308 and the memory 304. The state information detected by the state detection unit 306 is written in a predetermined location in the memory 304. Further, it has a function of accessing the memory 304 and a function of notifying the processor 301 of an interrupt according to timing information notified by the clock / timer 305.

  The wireless communication controller 307 is a communication interface that performs wireless connection with an AP in the wireless network in the wireless network shown in FIG. The wireless communication controller 307 is configured by Host_IF (USB or SDIO or PCI or the like) that is connected to a wireless LAN module that complies with IEEE802.11 related standards. It has a function of controlling a control LSI mounted on the wireless LAN module according to an instruction from the processor 301.

  The wireless packet aggregation processing stipulated in IEEE802.11n has a mechanism that is executed by the processor 301 controlling a control LSI that performs wireless LAN control via the wireless communication controller 307. Alternatively, it may be executed by the processor 301 generating a communication packet subjected to the aggregation process and transmitting the communication packet to the control LSI via the wireless communication controller 307.

  The procedure for switching the communication standard being used is also executed by giving an instruction to the control LSI that performs wireless LAN control via the wireless communication controller 307 under the control of the processor 301. For example, a procedure for switching from a communication system compliant with IEEE 802.11n to a communication system compliant with another standard such as IEEE 802.11g can be executed.

  The DMA controller 308 transfers data between each component and the memory 304 via the main bus 302 according to the setting from the processor 301. The DMA controller 308 includes a counter, and has a function of counting up when writing to a predetermined area of the memory 304 used as a buffer and counting down when reading. At this time, every time the unit data is transferred, the count is incremented or decremented by one. Further, the counter value is stored as a register as needed, and is accessible via the main bus 302.

  FIG. 4 is a state management table serving as a reference for performing wireless communication setting according to the operation state of the MT. This management table is stored inside the memory 304, and state information is written by the processor 301 and the state detection unit 306. The vertical items in the table represent the operation state of the MT and are items detected by the processor 301 and the state detection unit 306.

  The free capacity of the reception buffer is determined based on the information in the internal register of the DMA controller 308. When the state detection unit 306 is notified of timing information from the clock / timer 305 at a predetermined cycle, the state detection unit 306 reads information in an internal register of the DMA controller 308. The state detection unit 306 compares the read register information (counter value) with a memory area prepared as a reception buffer, and records the comparison result in a predetermined location in the memory 304. Here, each read / write process to / from a memory area prepared as a reception buffer is performed by DMA transfer using the DMA controller 308.

  Next, the operation rate of MT is detected by the state detection unit 306. The state detection unit 306 monitors accesses from the processor 301 and the DMA controller 308, and measures the access occurrence frequency based on a predetermined time. Based on the measurement result, the state detection unit 306 calculates and digitizes the operation rate of the MT, and records it in the state management table in the memory 304 according to the timing information notified from the clock / timer 305.

  Next, the communication type is detected by the processor 301. The processor 301 has a function of executing various communication protocol processes necessary for the MT. Therefore, what type of communication protocol is currently used is detected, and when a change occurs in the type of communication protocol being used, the type of communication is recorded in the state management table in the memory 304.

  Finally, the total number of communication sockets is detected by the processor 301. The communication socket is a combination of an IP address and a port number when performing data communication using the TCP / IP protocol. A communication socket is used to identify a communication partner, and connection processing and data communication processing are executed. The processor 301 has a function of executing various communication protocol processes necessary for the MT. Therefore, the processor 301 detects how many communication sockets are currently used, and when a change occurs in the total number of used communication sockets, the processor 301 stores the communication sockets in the state management table in the memory 304. Record the total number.

  Next, the horizontal items in the table indicate detection conditions 1 to 4 and detection conditions for whether or not to change wireless communication settings while MT and AP are wirelessly connected and data is transferred from AP to MT. This is expressed as conditions A to D. The detection conditions 1 to 4 and the detection conditions A to D are all based on the operation state of the MT, and are expressed by a combination of information detected as the operation state of the MT. In addition, the processor 301 selects which detection condition is set to enable / disable.

  The detection condition 1 is whether or not the free space of the reception buffer of the MT is in a state of 10% or less and whether or not the communication packet transmitted from the AP to the MT is using a UDP packet. This is a detection condition. When this detection condition is set to “enable” in advance by the control of the processor 301, when the state detection unit 306 detects the above condition, an interrupt notification is transmitted from the state detection unit 306 to the processor 301. Reference numeral 401 in FIG. 4 indicates that this detection condition 1 is enabled by the processor 301.

  When the detection condition 1 is detected, the free space of the MT reception buffer is extremely small, and a UDP packet that is not flow control is used for communication control in the communication protocol. That is, since there is no retransmission control means even in the communication protocol, it indicates a situation in which received data is highly likely to be lost.

  Detection condition 2 is based on whether or not the free space of the MT reception buffer is 30% or less and whether or not the MT operating state (bus usage rate) is 80% or more. It is. Reference numeral 402 in FIG. 4 indicates that the detection condition 2 is set to disable by the processor 301.

  When the detection condition 2 is detected, there is still some room in the free capacity of the MT reception buffer, but the MT processing capacity is close to the limit. That is, this indicates a situation in which the received data is highly likely to be lost because the MT processing capability is insufficient.

  Detection condition 3 detects whether the operating state (bus usage rate) of the MT is 80% or more and whether the total number of communication sockets with which the MT is communicating is 5 or more. It is a condition. Reference numeral 403 in FIG. 4 indicates that the detection condition 2 is set to disable by the processor 301.

  When the detection condition 3 is detected, even if the communication capacity of each communication socket is small, the overall MT processing capacity is close to the limit state. That is, this indicates a situation in which the received data is highly likely to be lost because the MT processing capability is insufficient.

  Detection condition 4 detects whether the communication packet sent from the AP is using a UDP packet and whether the total number of communication sockets with which MT is communicating is 15 or more. It is a condition. Reference numeral 404 in FIG. 4 indicates that the detection condition 4 is set to disable by the processor 301.

  When the detection condition 4 is detected, it is a state in which data communication is performed without flow control in a state where the total number of communication sockets is large. That is, it is shown that the possibility of erasing received data is increased as the timing conditions for MT internal processing become stricter as compared to the communication state in which the number of communication sockets is small.

  The detection condition A is whether or not the free space of the MT reception buffer is 60% or more, and whether or not the communication packet transmitted from the AP to the MT is using the TCP packet. It is a thing. When this detection condition is set to “enable” in advance by the control of the processor 301, the state detection unit 306 transmits an interrupt notification to the processor 301 when the state detection unit 306 detects the above condition. Reference numeral 405 in FIG. 4 indicates that the detection condition A is set to disable by the processor 301.

  When the detection condition A is detected, a free space of the MT reception buffer is sufficiently secured, and a TCP packet whose communication control on the communication protocol is flow control is used. That is, there is a retransmission control means on the communication protocol, and the MT reception buffer has a margin, so that the possibility that the received data is lost is low.

  The detection condition B is based on whether or not the free space of the MT reception buffer is 40% or more and whether or not the MT operating state (bus usage rate) is 20% or less. It is. 4 indicates that the detection condition B is set to disable by the processor 301.

  When the detection condition B is detected, there is still a margin in the free capacity of the MT reception buffer, and the MT processing capability is also sufficient. In other words, this indicates a situation in which the received data is unlikely to be lost because the MT processing capability is sufficient.

  Detection condition C detects whether the operating state of the MT (bus usage rate) is 20% or less and whether the total number of communication sockets with which the MT is communicating is 2 or less. It is a condition. Reference numeral 407 in FIG. 4 indicates that the detection condition C is set to enable by the processor 301.

  When the detection condition C is detected, the communication capacity of each communication socket is small and there is a sufficient margin in the MT processing capability. In other words, this indicates a situation in which the received data is unlikely to be lost because the MT processing capability is sufficient.

  The detection condition D is whether the communication packet transmitted from the AP to the MT is using a TCP packet, and whether the total number of communication sockets with which the MT is communicating is 5 or less. This is a detection condition. 4 indicates that the detection condition D is set to disable by the processor 301.

  When the detection condition D is detected, it is a state in which data communication is performed with flow control while the total number of communication sockets is small. That is, the possibility that the received data is lost due to factors such as the timing condition of the MT internal processing is considerably low.

  Each detection condition described above includes the information amount of communication packets accumulated in the buffer, the type of communication protocol used for communication between the wireless terminal and the wireless base station, the operating rate of the wireless terminal, and the wireless At least one of the number of communication sockets used for communication between the terminal and the wireless base station may be managed as a detection condition for detecting the operating state of the wireless terminal. These kinds of combinations can be arbitrarily set, and further conditions may be added.

  Next, with reference to the flowchart of FIG. 5, in the communication system as shown in FIG. 1, an operation procedure when the MT wirelessly connects to the AP and receives data such as images from the ND via the AP will be described. To do. The process in FIG. 5 is a process from when MT starts communication until it ends, and is a process for executing a change in wireless communication settings during communication.

  The state at the start of processing is a state in which data communication is going to be started via the AP 101 between either the MT 102 or MT 103 in the communication system as shown in FIG. 1 and any one of the NDs 106 to ND 109. The operating state of the MT is the state immediately after the power is turned on.

  In S501, the processor 301 determines whether or not there is a wireless communication connection request from the MT to the AP. When it is determined that there is a wireless communication connection request (S501; YES), the process proceeds to S502. On the other hand, when it is determined that there is no wireless communication connection request (S501; NO), the process waits until there is a wireless communication connection request.

  In S502, the processor 301 executes a procedure for the MT to wirelessly connect to the AP. Setting of parameters necessary for wireless communication is performed by transmitting / receiving an association request / response frame between the MT and the AP. Settings such as the type of aggregation processing and the amount of aggregation (aggregation amount) defined in IEEE802.11n and IEEE802.11e are simultaneously executed.

  In step S503, the processor 301 determines whether data transfer from the ND to the MT via the AP has started. If it is determined that data transfer from the ND to the MT has started (S503; YES), the process proceeds to S504. On the other hand, if it is determined that the data transfer from the ND to the MT has not been started (S503; NO), the process waits until the data transfer is started.

  In S504, the processor 301 sets a detection condition for changing the wireless communication setting set in S502. Here, the processing is to select one of detection conditions 1 to 4 necessary for reducing the amount of aggregation in the MT state management table shown in FIG. Or it becomes the process which selects one from the detection conditions A thru | or D required in order to increase the amount of aggregation.

  If video information such as video streaming is transmitted from the ND and a transmission method using a UDP packet is selected on the communication protocol, the detection condition 1 shown in FIG. 4 is selected.

  In step S <b> 505, the state detection unit 306 determines whether a timing notification with a predetermined period has been received. When it is determined that the notification of timing information has been received (S505; YES), the process proceeds to S506. On the other hand, if it is determined that the notification of timing information has not been received (S505; NO), the process proceeds to S509. Here, the predetermined cycle is a timer cycle set in the clock / timer 305 by the processor 301, and is a cycle necessary for performing a wireless setting change process.

  In step S506, the state detection unit 306 detects the state of the MT and acquires the detection result. Specifically, the state detection unit 306 detects the state of the MT such as the type of application being executed, the operating rate of the processor 301, and the free capacity of the reception buffer that functions as a storage unit. The state detection unit 306 accesses an internal register of the DMA controller 308 and writes the detected information in a predetermined location in the memory 304. Further, the memory 304 is accessed to read information described at a predetermined location.

  In step S507, the state detection unit 306 determines whether or not the detection condition set in step S504 matches the operation state detected / acquired in step S506. When it is determined that the detection condition set in S504 matches the operation state detected / acquired in S506 (S507; YES), the process proceeds to S508. On the other hand, when it is determined that the detection condition set in S504 does not match the operation state detected / acquired in S506 (S507; NO), the process proceeds to S509.

  In step S <b> 508, the processor 301 transmits a notification for changing the aggregation amount of the currently executed aggregation process to the AP. The notification from the MT to the AP is notified by using a Probe Request frame (probe request frame). Detailed examples will be described later. As another example, there is a case where a switching process of the currently used communication standard is started. For example, a process of switching from a communication system compliant with IEEE802.11n to a communication system compliant with another standard such as IEEE802.11g is executed under the control of the processor 301 (switching process).

  In S509, the processor 301 determines whether or not the communication has ended. If it is determined that the communication has ended (S509; YES), the process ends. On the other hand, when it is determined that the communication has not ended (S509; NO), the process returns to S503.

  Thus, the processes in the flowchart shown in FIG. 5 are completed.

  Next, with reference to the flowchart of FIG. 6, the operation when the MT wirelessly connects to the AP and receives data such as images from the ND via the AP in the communication system as shown in FIG. . The process in FIG. 6 is a process from when the AP starts communication until it ends, and is a process for executing a change in wireless communication setting during communication.

  The state at the start of processing is a state in which data communication is going to be started via the AP 101 between either the MT 102 or MT 103 in the communication system as shown in FIG. 1 and any one of the NDs 106 to ND 109. The operating state of the AP is a standby state.

  In step S601, the processor 201 determines whether there is a wireless communication connection request from the MT to the AP. If it is determined that there is a wireless communication connection request (S601; YES), the process proceeds to S602. On the other hand, when it is determined that there is no wireless communication connection request (S601; NO), the process waits until there is a wireless communication connection request.

  In S602, a wireless connection process is executed between the MT and the AP. Setting of parameters necessary for wireless communication is performed by transmitting / receiving an association request / response frame between the MT and the AP. Settings such as the type of aggregation processing and the amount of aggregation defined by IEEE 802.11n and IEEE 802.11e are also executed simultaneously.

  In step S603, the processor 201 determines whether the AP has transmitted the data received from the ND to the MT. If it is determined that the AP has transmitted the data received from the ND to the MT (S603; YES), the process proceeds to S604. On the other hand, when it is determined that the data received from the ND is not transmitted by the AP to the MT (S603: NO), the process waits until data transfer is started.

  In step S604, the processor 201 determines whether or not an aggregation amount change request notification has been received from the MT. When it is determined that the aggregation amount change request notification has been received from the MT (S604; YES), the process proceeds to S605. On the other hand, if it is determined that the aggregation amount change request notification has not been received from the MT (S604; NO), the process proceeds to S607. Here, the request for changing the amount of aggregation is notified from the MT to the AP using a probe request frame (probe request frame). In step S <b> 605, the processor 201 determines whether or not the current aggregation amount change setting is possible. Here, whether or not the AP can respond to the change request of the aggregation amount notified as MT is a criterion for condition determination. When it is determined that the current aggregation amount can be changed (S605; YES), the process proceeds to S606. On the other hand, if it is determined that the current aggregation amount cannot be changed (S605; NO), the process proceeds to S607.

  In S606, the processor 201 performs change setting of the aggregation amount. The processor 201 changes the internal setting of the wireless LAN control LSI via the wireless communication controller 207 to change the aggregation amount. Alternatively, when an aggregation-processed communication packet is generated and delivered to the wireless communication controller 207, the aggregation packet may be changed to generate a communication packet.

  In step S <b> 607, the processor 201 determines whether the communication has ended. If it is determined that the communication has ended (S607; YES), the process ends. On the other hand, when it is determined that the communication has not ended (S607; NO), the process returns to S603.

  Thus, the processes in the flowchart shown in FIG. 6 are completed.

  Next, with reference to FIG. 7, a configuration example of a MAC frame defined in IEEE 802.11n will be described. This MAC frame is a MAC frame transmitted from the MT to the AP in order to notify the aggregation amount change in the processing of S508 shown in FIG. This MAC frame is a frame whose management frame subtype is a probe request.

  A frame format 701 indicates a frame format of a management frame defined by IEEE 802.11n. Here, it is a probe request frame, which is a kind of management frame.

  HT Capabilities elements format 702 is a format of HT Capabilities included in a frame body (Frame Body) included in the probe request frame. The HT Capabilities elements format 702 includes an HT Capabilities Info field 703 and an A-MPDU Parameters field 704.

  In order to notify the aggregation amount change from the MT to the AP, the description content of the HT Capabilities Info field 703 or the A-MPDU Parameters field 704 is changed and transmitted.

  The change in HT Capabilities Info field 703 is performed by changing the value of the internal Maximum A-MSDU Length. The change in the A-MPDU Parameters field 704 is performed by changing the value of Maximum A-MPDU Length Exponent and the value of Maximum A-MPDU Length Spacing.

  According to the present invention, it is possible to change the setting of the aggregation process according to the state change on the receiving side. Thereby, even if the aggregation process currently being executed is continued, it is possible to suppress a decrease in throughput due to data loss or retransmission. Further, even if the aggregation process currently being executed is continued, the throughput can be improved if there is a margin in received data processing capacity as the operating state of the MT on the receiving side.

(Other embodiments)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

Claims (13)

A wireless communication system comprising a plurality of wireless terminals and a wireless base station,
The radio base station is
Comprising a transmission means for aggregating a plurality of packets and transmitting them as one communication packet;
The wireless terminal is
Receiving means for receiving the communication packets aggregated and transmitted by the transmitting means;
As the operating state of the wireless terminal, the information amount of the communication packet stored in the buffer, the operation rate indicating the bus usage rate of the wireless terminal, or the communication between the wireless terminal and the wireless base station Detection means for detecting the type of communication protocol used or the number of communication sockets ;
When the communication packet aggregated from the radio base station to the radio terminal is transmitted by the transmission means, depending on the operating state of the radio terminal detected by the detection means, to the radio base station And a notification means for notifying the change of the aggregate amount of packets,
The radio base station is
A wireless communication system, comprising: changing means for changing the aggregate amount in response to the notification by the notification means. When the change of the aggregate amount of communication packets is notified from the wireless terminal to the wireless base station by the notification means, the change is notified as a MAC frame in which the subtype of the management frame is a probe request. The wireless communication system according to claim 1 . The wireless terminal is
When the predetermined communication protocol is detected by the detecting means, the apparatus further comprises a switching means for switching a communication method used for communication between the wireless terminal and the wireless base station to another communication method. The wireless communication system according to claim 1 . A method for controlling a wireless communication system comprising a plurality of wireless terminals and a wireless base station,
The radio base station is
The transmission means comprises a transmission step of aggregating a plurality of packets and transmitting them as one communication packet,
The wireless terminal is
A receiving step for receiving the communication packets aggregated and transmitted by the transmitting step;
The detection means, as the operating state of the wireless terminal, the information amount of the communication packet stored in the buffer, the operation rate indicating the bus usage rate of the wireless terminal, or between the wireless terminal and the wireless base station A detection step of detecting the communication protocol type or the number of communication sockets used for communication between ,
When the communication packet aggregated from the radio base station to the radio terminal is transmitted in the transmission step, the notification unit is configured to change the radio depending on the operation state of the radio terminal detected in the detection step. A notification step of notifying the base station of a change in the aggregate amount of packets,
The radio base station is
A control method for a wireless communication system, characterized in that a changing means includes a changing step of changing the aggregate amount in response to the notification in the notification step. The program for making a computer perform each process of the control method of the radio | wireless communications system of Claim 4 . A communication device,
Receiving means for receiving an aggregate packet in which a plurality of packets are aggregated from another communication device;
Storage means for storing the aggregated packets received by the receiving means;
Based on the amount of information stored by the storage means, the bus usage rate of the communication device, the type of communication with the other communication device, or the number of connections with which the communication device is communicating, Request means for requesting the other communication device to change the aggregate amount of aggregate packets transmitted from the other communication device to the communication device;
A communication apparatus comprising: The communication apparatus according to claim 6, wherein the request unit makes a request to the other communication apparatus using a probe request frame. The communication device according to claim 6, wherein the request unit requests switching of a communication type in wireless communication with the other communication device. The communication device according to claim 6, wherein the aggregate packet is an aggregated packet based on the IEEE 802.11 series standard. The communication apparatus according to claim 6, wherein the bus is used for communication between at least the receiving unit and the storage unit. The communication device according to claim 6, wherein the aggregate packet includes data compliant with TCP / IP. A communication device control method comprising:
A receiving step for receiving an aggregate packet in which a plurality of packets are aggregated from another communication device; and
A storage step of storing the aggregated packet received by the reception step;
The request means stores the amount of information stored in the storage step, the bus usage rate of the communication device, the type of communication with the other communication device, or the number of connections with which the communication device is communicating. A requesting step for requesting the other communication device to change the aggregate amount of the aggregate packet that the other communication device transmits to the communication device;
A method for controlling a communication apparatus, comprising: A storage medium storing a program for causing a computer to execute the steps of the communication apparatus control method according to claim 12.

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