JP2007134812A - Communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication apparatus where terminals mounted with priority control and the terminals without priority control are associated with each other, that ensures voice communication quality. <P>SOLUTION: The communication apparatus (base station 2) being associated with a terminal 3 and transmitting/receiving packets to/from the terminal 3 comprises: a wireless transmission reception section 11 for transmitting the packets to the terminal 3; a simultaneous speech measurement section 21 for detecting the packets used for voice communication to measure the number of simultaneous speeches being the number of voice communication speeches; and a state discrimination/restriction instruction section 30 for controlling the traffic amount of the packets transmitted to the terminal 3 by the wireless transmission reception section 11 in response to the number of simultaneous speeches. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication apparatus such as a wireless LAN base station for connecting a moving terminal to an upper network, for example.

  In conventional wireless LAN systems such as IEEE802.11b, a DCF (Distributed Coordination Function) for performing transmission control by the CSMA / CA method is defined for each wireless station such as an access point or a wireless LAN terminal. Furthermore, EDCA (Enhanced Distributed Channel Access), which is an extension of DCF, is under standardization as an access control procedure for supporting QoS required for priority communication such as voice communication (IEEE802.11e). In this EDCA, packets to be transmitted are classified into four access categories, and packet transmission priority control is performed by giving different EDCA parameters to each category. For example, a method of performing traffic control by dynamically changing a contention window (usually abbreviated as “CW”), which is one of EDCA parameters, based on the amount of traffic and the number of connected terminals is known. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 2005-12725

  However, even if the EDCA function is mounted on the access point, the wireless LAN terminal is not necessarily mounted with the EDCA function, and such a terminal is controlled by the conventional DCF. Therefore, in a wireless LAN environment where terminals with priority control (EDCA mounting terminals) and terminals without priority control (EDCA non-mounting terminals) coexist, especially in a state where a large number of terminals without EDCA are occupied. Has a problem that a voice communication packet, which is a priority access category of an EDCA-equipped terminal, is affected by a frame of a terminal not equipped with an EDCA, resulting in voice communication quality degradation.

  The present invention has been made in view of such a problem. In a communication apparatus in which a terminal in which priority control is implemented and a terminal in which priority control is not implemented are mixed and associated, the quality of a priority packet (voice communication packet) is improved. An object is to provide a communication device to be secured.

  In order to solve the above-described problem, a communication apparatus according to the first aspect of the present invention (for example, the base station 2 in the embodiment) associates with a terminal and transmits / receives a packet to / from the associated terminal. Yes, the transmission means for transmitting packets to the terminal (for example, the wireless transmission / reception unit 11 in the embodiment), and the number of simultaneous communications that is the number of priority communications by detecting packets corresponding to the priority communications to be prioritized in the transmission and reception According to the simultaneous communication number measuring unit (for example, the simultaneous call number measuring unit 21 in the embodiment) that measures (for example, the number N of simultaneous calls in the embodiment) and the simultaneous communication number measured by the simultaneous communication number measuring unit, And a control unit (for example, the state determination / regulation instruction unit 30 in the embodiment) that controls the traffic amount of the packet transmitted to the terminal by the transmission unit. Composed of Te.

  Also, the communication device according to the second aspect of the present invention associates with a terminal and transmits / receives a packet to / from the associated terminal, and is associated with a transmission means for transmitting the packet to the terminal. Active number measuring means for measuring the number of active terminals that is the number of connected terminals (for example, the active number measuring unit 23 in the embodiment), and detecting a packet corresponding to priority communication that should be prioritized in transmission and reception, According to the simultaneous communication number measuring means for measuring the simultaneous communication number that is the number of communication, and the number of active terminals measured by the simultaneous communication number measuring means and the number of active terminals measured by the active number measuring means, the terminal by the transmission means And a control means for controlling the traffic amount of packets transmitted to the network.

  In the first and second communication apparatuses, the transmission unit is configured to transmit a packet to the terminal according to the parameter, and the control unit controls the traffic amount by setting the parameter of the transmission unit. Preferably, it is configured.

  A communication apparatus according to the third aspect of the present invention associates with a terminal and transmits / receives a packet to / from the associated terminal, and has a transmission means for transmitting the packet to the terminal and priority in the transmission / reception. The number of simultaneous communication that measures the number of simultaneous communication that is the number of the priority communication by detecting the packet corresponding to the priority communication to be performed, and the traffic volume of the packet transmitted from the terminal among the associated terminals Simultaneous measurement with throughput measuring means (for example, voice quality measuring unit 22 in the embodiment) for measuring the throughput of packets transmitted and received between terminals that cannot directly control the terminal (for example, the general terminal 3b in the embodiment) The number of terminals that cannot be directly controlled to ensure the quality of priority communication Parameter storage means (for example, the parameter management table 32 in the embodiment) for storing the threshold value of the network, and a threshold value corresponding to the simultaneous communication number measured by the simultaneous communication number measurement means is extracted from the parameter storage means, and the throughput is equal to or greater than the threshold value. In some cases, the control unit includes a control unit that controls the traffic amount of a packet transmitted to a terminal that cannot be directly controlled by the transmission unit.

  At this time, it is preferable that the transmission unit is configured to transmit a packet to the terminal according to the QoS parameter, and the control unit is configured to control the traffic amount by setting the QoS parameter of the transmission unit. Alternatively, the transmission means is configured to adjust the traffic volume by shaping a packet transmitted to the terminal according to the traffic parameter, and the control means controls the traffic volume by setting the traffic parameter of the transmission means. Preferably it is comprised.

  A communication apparatus according to the fourth aspect of the present invention associates with a terminal and transmits / receives a packet to / from the associated terminal. The communication apparatus transmits a packet to the terminal according to the QoS parameter, and according to the traffic parameter. Simultaneously the transmission means configured to adjust the traffic volume by shaping the packet transmitted to the terminal, and the number of communication of the priority communication by detecting the packet corresponding to the priority communication to be prioritized in the transmission and reception Measures the throughput of packets sent and received between the simultaneous communication number measuring means that measures the number of communications and the terminal that cannot directly control the traffic volume of packets sent from this terminal among the associated terminals Throughput measurement means and priority communication products for the number of simultaneous communication Parameter storage means for storing a throughput threshold value of a terminal that cannot be directly controlled, and a threshold value corresponding to the number of simultaneous communications is extracted from the parameter storage means, and the throughput is equal to or greater than a predetermined threshold value In addition, by setting the QoS parameter in the transmission unit, the traffic amount of the packet transmitted to the terminal that cannot be directly controlled is controlled, and when the QoS parameter reaches the limit value, the traffic parameter is transmitted. And a control means for controlling the amount of traffic by shaping a packet transmitted to a terminal that cannot be directly controlled.

  In the communication apparatus according to the third and fourth aspects of the present invention, the control means stores the number of times of traffic volume regulation, and when the throughput is equal to or greater than a predetermined threshold, the number of times of continuation is increased, and the throughput is increased. It is preferable to reduce the number of times of continuation when the value is smaller than the predetermined threshold value, and to control the transmission means so as to increase or decrease the traffic amount according to the number of times of continuation.

  A communication apparatus according to the fifth aspect of the present invention associates with a terminal and transmits / receives a packet to / from the associated terminal. A packet corresponding to priority communication to be prioritized in transmission / reception is transmitted. The number of simultaneous communication that detects and measures the number of simultaneous communication that is the number of prioritized communication, and of the terminals that cannot directly control the traffic volume of packets transmitted from this terminal among the associated terminals Measures the total throughput of packets sent and received between the active number measuring means that is the number of connections and the number of active terminals and a terminal that cannot be directly controlled, and this terminal for each terminal that cannot be directly controlled Simultaneously with throughput measuring means for measuring the uplink throughput of UDP / IP packets transmitted from The threshold of the total throughput transmitted and received with terminals that cannot be directly controlled to ensure the quality of priority communication, and the number of simultaneous communication and the number of active terminals Parameter storage means for storing a threshold of upstream throughput per terminal that cannot be directly controlled, which is allowed to ensure the quality of priority communication, and a threshold of total throughput for the number of simultaneous communications from the parameter storage means, In addition, an uplink throughput threshold value corresponding to the number of simultaneous communications and the number of active terminals is extracted, the total throughput measured by the throughput measuring means is equal to or greater than the total throughput threshold value, and the uplink throughput of any terminal is the uplink throughput value. When the threshold is exceeded, the total throughput is less than the total throughput threshold Until fence, and a control means for cutting the association of the terminal can not be larger direct control of the uplink throughput.

  Further, a communication device according to a sixth aspect of the present invention associates with a terminal and transmits / receives a packet to / from the associated terminal, and transmits a packet corresponding to priority communication to be prioritized in transmission / reception. A simultaneous communication number measuring means for detecting and measuring the number of simultaneous communication that is the number of prioritized communication, and a terminal that cannot directly control the traffic amount of packets transmitted from this terminal among the associated terminals Measures the total throughput of packets sent and received between them, and measures the uplink throughput of UDP / IP packets transmitted from this terminal for each terminal that cannot be directly controlled, and the number of simultaneous communications To a terminal that cannot be directly controlled and is allowed to ensure the quality of priority communication. A parameter storage means for storing a threshold value of the total throughput to be transmitted, and a threshold value of the total throughput for the number of simultaneous communications measured by the simultaneous communication number measurement means from the parameter storage means, and the total throughput measured by the throughput measurement means is Control means for disconnecting associations of terminals that cannot be directly controlled with a large uplink throughput until the total throughput becomes smaller than the total throughput threshold when the throughput is equal to or greater than the threshold.

  When the communication device according to the first and second aspects of the present invention is configured as described above, the traffic volume of packets transmitted to the terminal is appropriately set according to the number of simultaneous communication of priority communication. It is possible to ensure the quality of priority communication by the associated terminal. In particular, it controls the upstream traffic (traffic from the terminal to the communication apparatus) by the TCP / IP communication of a terminal (EDCA non-implemented terminal) that cannot set EDCA parameters directly from the communication apparatus according to the present invention and cannot be directly controlled. Therefore, the quality of priority communication can be ensured.

  In addition, when the communication device according to the third and fourth aspects of the present invention is configured as described above, the traffic of this terminal is regulated according to the traffic volume of the terminal not mounted with EDCA, and is associated with this communication device. The quality of priority communication by the terminal can be ensured. As a result, it is possible to control uplink traffic by TCP / IP communication of a terminal not mounted with EDCA that generates more traffic than expected.

  Further, when the communication device according to the fifth and sixth aspects of the present invention is configured as described above, the communication device and the communication device are disconnected by disconnecting the association with the terminal according to the traffic amount of the terminal that cannot be directly controlled. It is possible to ensure the quality of priority communication by the associated terminal. As a result, the quality of the priority communication can be ensured by forcibly leaving the terminal that performs UDP / IP communication exceeding the threshold value from the communication device.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the communication system to which the communication apparatus according to the present invention is applied includes a base station 2 and a terminal 3 that is wirelessly connected to the base station 2 as shown in FIG. A case of the wireless LAN system 1 will be described. As shown in FIG. 1, the wireless LAN system 1 is configured by connecting a plurality of base stations 2 to a wired network 5 such as a LAN. The wired network 5 is connected to a higher network (upper network 4). Connected and configured. As a result, the terminal 3 can communicate with another terminal 3 via the base station 2 and communicate with the higher level network 4. In this wireless LAN system 1, a terminal 3 in which EDCA is implemented (hereinafter referred to as “priority terminal 3a”) and a terminal 3 in which EDCA is not implemented (hereinafter referred to as “general terminal 3b”). Are mixed. In this embodiment, a case will be described in which voice communication is given priority as priority communication.

  First, the configuration of the base station 2 will be described with reference to FIG. The base station 2 includes a communication processing unit 10 that performs communication with the terminal 3 or the wired network 5, a traffic information acquisition unit 20 that acquires a traffic state of the communication processing unit 10, and traffic acquired by the traffic information acquisition unit 20 It comprises a state determination / restriction instruction unit 30 that determines a communication state based on information and transmits a restriction instruction to the communication processing unit 10.

  The communication processing unit 10 associates with another base station 2 via the wired network 5 and a wireless transmission / reception unit 11 that processes packets exchanged with the terminal 3 associated with the base station 2 by wireless communication. And a wired transmission / reception unit 13 for processing packets exchanged with the terminal 2 and the higher-level network 4. Note that communication between the wireless transmission / reception unit 11 and the terminal 3 is controlled by the wireless I / F unit 12, and communication with the wired network 5 (the upper network 4 or the like) is controlled by the wired I / F unit 14. Packets exchanged between the wireless transmission / reception unit 11 and the wired transmission / reception unit 13 are performed via the restriction processing unit 15. The restriction processing unit 15 performs establishment / disconnection of the association with the terminal 3 and control of packets exchanged with the terminal 3 in accordance with the restriction instruction from the state determination / regulation instruction unit 30. The association means that the base station 2 recognizes the terminal 3 in response to a connection request from the terminal 3 and establishes a communication path.

The traffic information acquisition unit 20 acquires traffic information necessary for state determination and regulation processing by analyzing packets transferred in the wireless transmission / reception unit 11 and the wired transmission / reception unit 13. , A voice quality measuring unit 22 and an active terminal measuring unit 23. The simultaneous call number measuring unit 21 extracts call control packets (SIP and the like) and voice packets (RTP packets), determines the start / end of the call, and counts the number as the simultaneous call number N. For example, as a protocol for voice communication, SIP (Session Initial Protocol) and RTP (Real-time)
When the transfer protocol is used, the call is started by observing the SIP packet and considering the call start when the INVITE packet is received, and the call end when receiving the BYE packet or the CANCEL packet. At the same time, the RTP packet is observed, and when a voice communication RTP packet is received, it is regarded as a call start.

  The voice quality measuring unit 22 monitors packets that are not used for voice communication (referred to as “non-priority data”), the throughput of these packets (traffic from the terminal 3 to the base station 2 is referred to as “upstream”, and The traffic from the base station 2 to the terminal 3 is referred to as “downlink, and the sum of the uplink and downlink throughput is referred to as“ total throughput ”), and this total throughput Total is output as the voice quality (as the total throughput Total increases) Affects the quality of voice communication). Similarly, the packet transmitted / received with the general terminal 3b is monitored, and total throughput Total2 is output. In addition, the voice quality measuring unit 22 is configured to measure the traffic amount for each general terminal 3b at regular intervals, and packets used for UDP communication among packets transmitted to and received from the terminal 3 It is configured to be able to measure the throughput.

  It is also possible to extract voice packets (RTP, RTCP, etc.) and measure the quality of voice communication from the packet loss state of the wireless section. In this case, as a method for measuring the quality of voice communication, for example, when RTP packets are used, the sequence number of voice RTP packets is observed for each terminal 3, and the number of packets lost at a fixed interval is counted. It is obtained by calculating the average packet loss rate of the terminal 3 performing voice communication. Alternatively, if the transmission intervals of the voice RTP packets of each terminal 3 are the same (known), the number of actual transfer RTP packets of all terminals 3 is divided by the product of the number of RTP packets without loss of one terminal and the number of simultaneous calls. Thus, the packet loss rate may be calculated. Further, packet fluctuation may be measured as the quality of voice communication.

  The active terminal number measurement unit 23 is configured to measure the number of general terminals 3b associated with the base station 2 as the number M of active terminals. At this time, among the associated general terminals 3b, the number of terminals having traffic exceeding a predetermined threshold may be set as the number M of active terminals.

  The state determination / restriction instruction unit 30 performs the determination of the restriction state and the restriction instruction using the traffic information from the traffic information acquisition unit 20, and includes a restriction state determination unit 31, a parameter management table 32, a state management unit 33, And it comprises a restriction instruction unit 34. Based on the traffic information from the traffic information acquisition unit 20 and the information in the parameter table stored in the parameter management table 32, the restriction state determination unit 31 determines the restriction state so as to ensure the quality of voice communication of the priority terminal 3a. The result is transferred to the state management unit 33. The restriction instruction unit 34 is configured to notify the restriction processing unit 15 of the communication processing unit 10 of the restriction instruction according to the restriction state stored in the state management unit 33.

  Here, the control method of the packet transmitted / received with the terminal 3 in the base station 2 is demonstrated using FIG. FIG. 3 shows only the main part related to packet control in the base station 2. The wireless transmission / reception unit 11 includes a priority data (voice communication) queue 111 and a non-priority data (general data) queue 112 as queues for packets transmitted to the terminal 3. A reception queue 113 is provided as a queue. The packet transmitted to the terminal 3 is received by the data classification function 114 of the wireless transmission / reception unit 11. When a packet is received by the data classification function 114, it is determined whether or not the packet is a packet for voice communication. If the packet is not a packet for voice communication (in the case of non-priority data), the data queue 116 stores each packet. If the packet is for voice communication (priority data), the packet is stored in the priority queue 111.

  Packets (non-priority data) stored in the data queue 116 for each terminal are extracted by the queuing function 117 based on round robin and stored in the non-priority queue 112. The packets stored in the priority queue 111 and the non-priority queue 112 are transmitted to the wireless I / F unit 12 based on the QoS parameters (AIFS, CWmin, CWmax, TXOP) set in the QoS parameter setting functions 118 and 119, respectively. Is transmitted to each terminal 3. At this time, the round robin interval and the QoS parameter value are set by the queuing function 117 by the queuing interval control function 151 and the QoS parameter control function 152 of the restriction processing unit 15. Further, for the priority terminal 3a, the QoS parameter is set using a beacon or the like by the terminal QoS parameter control function 154 of the restriction processing unit 15. Although not shown, the priority terminal 3a also has a priority queue and a non-priority queue, and is controlled by QoS parameters. Further, the association with the terminal 3 is controlled using a beacon by the wireless control function 153 of the restriction processing unit 15.

  When the base station 2 is configured as described above, the voice communication packet in the priority queue 111 is preferentially transmitted to the terminal 3 (priority terminal 3a) by setting the QoS parameter for the priority queue 111 and the QoS parameter for the non-priority queue 112. Therefore, the quality of voice communication can be ensured. Further, by adjusting the round robin interval by the queuing function 117, the amount of packets stored in the non-priority queue 112 can be limited to control the traffic amount of general data transmitted to the terminal 3 ( In the following description, this will be referred to as “shaping processing”), and this can reduce the influence of general data communication on voice communication.

(Example 1-1)
Now, a first embodiment of the restriction method of the communication processing unit 10 by the state determination / regulation instruction unit 30 will be described with reference to FIGS. 4 and 5. In the first embodiment, an appropriate EDCA parameter is determined and set in the communication processing unit 10 from the number N of simultaneous voice communication calls measured by the simultaneous call number measuring unit 21 and the number M of active terminals of the general terminal 3b. In addition, a shaping process is performed as necessary.

  When the number N of simultaneous calls or the number M of active terminals changes, the restriction state determination unit 31 acquires the number N of simultaneous calls and the number M of active terminals from the traffic information acquisition unit 20 (step S100). In the parameter management table 32 of the state determination / regulation instruction unit 30, EDCA parameters are determined as a matrix in which the number of simultaneous calls N is taken as a row and the number of active terminals M is taken as a column as shown in FIG. The restriction state determination unit 31 acquires the corresponding table number TB from the number of simultaneous calls N and the number of active terminals M, and stores the table number TB in the state management unit 33. (S101).

  In the state management unit 33, EDCA parameters calculated using a traffic model assumed in advance as shown in FIG. 4B are stored in association with table numbers as an EDCA parameter set. The EDCA parameter set includes an EDCA parameter for the priority queue 111 and the non-priority queue 112 of the base station 2 and an EDCA parameter for the priority queue and the non-priority queue (not shown) of the priority terminal 3a for each table number TB. Is stored. Further, this EDCA parameter set includes control information for shaping processing, and the quality of voice communication is ensured by performing shaping processing for portions where the EDCA parameter exceeds a settable threshold. Using such an EDCA parameter set, the restriction instructing unit 34 acquires EDCA parameters and shaping processing information corresponding to the table number TB stored in the state management unit 33 and sends the restriction processing unit 15 as a restriction instruction. Transmit (step S102).

  Then, the QoS parameter control function 152 of the restriction processing unit 15 sets EDCA parameters for restriction instructions in the QoS parameter setting functions 118 and 119 of the priority queue 111 and the non-priority queue 112, and the terminal QoS parameter control function 154 Then, EDCA parameters are set for the priority terminal 3a (step S103). In this step S103, when the shaping process is necessary, the queuing interval control function 151 sets the round robin interval of the queuing function 117 in accordance with the regulation instruction.

  According to such a configuration, downlink traffic of packets transmitted from the base station 2 to the terminal 3 in response to changes in the number of simultaneous calls N and the number of active terminals M, and uplink traffic transmitted from the priority terminal 3a to the base station 2 Therefore, the voice communication packet is prioritized and the quality of the voice communication can be ensured. For traffic that cannot be controlled by the EDCA parameter (when the parameter setting range is exceeded), the amount of traffic is limited because the non-voice communication packet, that is, the downstream packet of the non-priority queue 112 is shaped. The quality of voice communication can be ensured. Of the terminals 3, the general terminal 3b also transmits all the downstream packets via the non-priority queue 112, so that the traffic is limited by the EDCA parameters and the shaping process. As a result, the traffic of the upstream packets from the general terminal 3b Since the control can be limited and controlled by the characteristics of TCP / IP, the quality of voice communication of the priority terminal 3a is ensured.

(Example 1-2)
In the first embodiment described above, the EDCA parameter is configured to be dynamically set according to changes in the number of simultaneous calls N and the number of active terminals M. However, as shown in FIG. It is also possible to configure the EDCA parameter set stored in the management unit 33 so as to correspond only to the number N of simultaneous calls. Also at this time, by combining with the above-described shaping process (similar to FIG. 4B, the control information of the shaping process is held in the EDCA parameter set), the quality of voice communication can be ensured.

  When the general terminal 3b transmits / receives traffic exceeding the traffic model for calculating the EDCA parameter, when the wireless environment deteriorates due to noise or the like and the effective bandwidth decreases, or is outside the communication area of the base station 2 For this reason, when there is another terminal 3 that interferes with the terminal 3 associated with the base station 2 but cannot be detected from the base station 2, the traffic control shown in the first embodiment It may not be possible to cope with ensuring the quality of voice communication. Therefore, in the second embodiment, a method will be described in which packets flowing through the base station 2 are monitored and controlled based on the degree of influence of non-priority data on voice communication, that is, the degree of influence on voice quality.

(Example 2-1)
In the second embodiment, as shown in FIG. 6, when the total throughput Total of non-priority data exceeds a predetermined threshold with respect to the number N of simultaneous voice communication calls, control is performed to ensure voice quality. Is. Now, a method for regulating the communication processing unit 10 by the state determination / regulation instruction unit 30 will be described with reference to FIG. In this embodiment, the following processing is repeatedly executed at regular intervals. In addition, the restriction state determination unit 31 is provided with an area (memory) for storing various information, and stores the number n of times of restriction state continuation. The parameter management table 32 stores the parameters shown in FIG. 6A in advance. Specifically, the parameter management table 32 stores the threshold THL of the total throughput of non-priority data with respect to the number N of simultaneous calls and the simultaneous calls. The downlink minimum contention window THLD_CWmin of non-priority data for the number N is stored as a parameter table.

  When this process starts, first, the restriction state determination unit 31 acquires the number N of simultaneous calls from the number of simultaneous calls measurement unit 21 of the traffic information acquisition unit 20 (step S200), and whether the number N of simultaneous calls is 0 or not. Whether or not (that is, whether or not voice communication is being performed) is determined (step S201).

  When it is determined in step S201 that the number N of simultaneous calls is not 0, the restriction state determination unit 31 acquires the total throughput Total of non-priority data as the quality information of the voice communication from the voice quality measurement unit 22 (step S202). Further, the total throughput threshold value THL and the downlink minimum contention window THLD_CWmin for the current number N of simultaneous calls are acquired from the parameter management table 32 (step S203), and the total throughput Total and the total throughput threshold value THL are compared. (Step S204).

  If it is determined in step S204 that the total throughput Total is equal to or greater than the threshold THL, the number of continuations n is increased by 1 (step S205), and the downlink minimum contention window THLD_CWmin and the number of continuations are calculated using the following equation (1). From n, the minimum contention window TXLD_CWmin set in the non-priority queue 112 is calculated and determined, stored in the state management unit 33 (step S206), and one process is terminated.

TXLD_CWmin = 2 ^{log2 (THLD_CWmin + 1) + n} -1 (1)

  On the other hand, if it is determined in step S204 that the total throughput Total is smaller than the threshold value THL, it is determined whether or not the number of continuations n is 0 (step S208). Is decreased by 1 (step S209), and the downlink minimum contention window TXLD_CWmin is calculated by the above-described equation (1) and stored in the state management unit 33 (step S210), and one process is completed.

  If it is determined in step S208 that the number of continuations n is 0, the downlink minimum contention window TXLD_CWmin is returned to the initial value and stored in the state management unit 33 (step S212), and one process is completed. . If it is determined in step S201 that the number of simultaneous calls N is 0, the number of continuations n is reset to 0 (step S211), the minimum downlink contention window TXLD_CWmin is returned to the initial value, and the state management unit 33 is reset. Store (step S212), and one process is completed.

  The restriction instructing unit 34 extracts the minimum downlink contention window TXLD_CWmin determined in steps S206, S210, and S212 from the state management unit 33, transmits it to the restriction processing unit 15 of the communication processing unit 10 as a restriction instruction, and sends this restriction instruction. The restriction processing unit 15 that has received the QoS parameter setting function 152 sets the minimum downlink contention window TXLD_CWmin in the QoS parameter setting function 119 for the non-priority queue 112 (step S207).

  In this way, the threshold THL of the total throughput of non-priority data allowed based on the number N of simultaneous calls is set, and when the threshold THL is exceeded, the contention window THLD_CWmin of the non-priority queue 112 is set. Thus, by restricting the traffic of the terminal 3 that transmits and receives non-priority data, the quality of voice communication can be ensured by giving priority to the packets in the priority queue 111. As in the case of the first embodiment, by setting the downlink contention window THLD_CWmin for non-priority data, not only the downlink traffic is limited, but also the uplink traffic is limited by the processing characteristics of TCP / IP. Can be controlled. Further, since the number of times of restriction state continuation n is used for calculating the minimum downlink contention window THLD_CWmin, the limit of the downlink traffic is configured to vary stepwise.

(Example 2-2)
By the way, the restriction of the downstream traffic of non-priority data can be realized not only by the operation of the minimum contention window THLD_CWmin but also by adjusting the round robin interval of the queuing function 117. FIG. I will explain. In this case, the parameter management table 32 is transmitted by the non-priority queue 112 corresponding to the number N of simultaneous calls instead of the minimum contention window THLD_CWmin as shown in FIG. A downlink throughput threshold THLD (of priority data) is stored in advance.

  When this process starts, first, the restriction state determination unit 31 acquires the number N of simultaneous calls from the number of simultaneous calls measurement unit 21 of the traffic information acquisition unit 20 (step S220), and whether the number N of simultaneous calls is 0 or not. It is determined whether or not (that is, whether or not voice communication is being performed) (step S221).

  When it is determined in step S221 that the number of simultaneous calls N is not 0, the restriction state determination unit 31 acquires the total throughput Total of non-priority data as voice communication quality information from the voice quality measurement unit 22 (step S222). In addition, the threshold THL of the total throughput of non-priority data and the downstream throughput threshold THLD for the current number N of simultaneous calls are acquired from the parameter management table 32 (step S223), and the total throughput Total and the total throughput threshold THL are obtained. Compare (step S224).

  If it is determined in step S224 that the total throughput Total is equal to or greater than the threshold THL, the number of continuations n is increased by 1 (step S225), and the downstream throughput threshold THLD and the number of continuations n are calculated using the following equation (2). From this, the downlink transmission allowable amount TXLD of the non-priority data (downlink packet) is calculated and determined and stored in the state management unit 33 (step S226), and one process is completed. In Equation (2), TX_OFF indicates a unit amount (downlink transmission suppression unit amount) when the downlink transmission amount is suppressed, and is preset in the restriction state determination unit 31.

TXLD = THLD− (n * TX_OFF) (2)
However, TXLD ≧ 0

  On the other hand, when it is determined in step S224 that the total throughput Total is smaller than the threshold value THL, it is determined whether or not the number of continuations n is 0 (step S228). Is decreased by 1 (step S229), the downlink transmission allowable amount TXLD is calculated by the above-described equation (2) and stored in the state management unit 33 (step S230), and one process is completed.

  When it is determined in step S228 that the number of continuations n is 0, the downlink transmission allowable amount THLD is returned to the initial value and stored in the state management unit (step S232), and one process is completed. If it is determined in step S221 that the number N of simultaneous calls is 0, the number of continuations n is reset to 0 (step S231), and the downlink transmission allowable amount THLD is returned to the initial value and stored in the state management unit ( Step S232), one process is completed.

  The restriction instructing unit 34 extracts the downlink transmission allowable amount TXLD determined in steps S226, S230, and S232 from the state management unit 33, transmits it as a restriction instruction to the restriction processing unit 15 of the communication processing unit 10, and receives this restriction instruction. The restriction processing unit 15 sets the round robin interval in the queuing function 117 so that the downlink transmission allowable amount THLD is obtained by the queuing interval control function 151 (step S227).

  In this way, since the downstream traffic of non-priority data is limited by controlling the take-out interval of the data queue 116 for packets stored in the non-priority queue 112 by the queuing function 117, the priority queue 111 is given priority. The quality of voice communication can be ensured. In this case as well, by setting the downlink transmission allowance THLD, not only the downlink traffic is limited, but also the uplink traffic can be limited by the TCP / IP processing characteristics. In addition, since the downlink transmission allowable amount THLD is calculated using the number of times n of the restricted state, the downlink traffic restriction is configured to change stepwise.

(Example 2-3)
Alternatively, it is possible to control to ensure the quality of voice communication by both the downlink minimum contention window THLD_CWmin for the non-priority queue 112 and the downlink transmission allowance THLD, which will be described with reference to FIG. In this case, the parameter management table 32 includes a threshold THL of the total throughput of non-priority data, a minimum downlink contention window THLD_CWmin of non-priority data for the number N of simultaneous calls, and non-priority data corresponding to the number N of simultaneous calls. Are stored in advance. The memory of the restriction state determination unit 31 stores a contention window restriction continuation number n and a transmission suppression amount restriction continuation number k.

  When this process is started, the restriction state determination unit 31 first acquires the simultaneous call number N from the simultaneous call number measurement unit 21 (step S240), and determines whether or not the simultaneous call number N is zero. (Step S241).

  When it is determined in step S241 that the number N of simultaneous calls is not 0, the restriction state determination unit 31 acquires the total throughput Total of non-priority data as the quality information of the voice communication from the voice quality measurement unit 22 (step S242). Further, the threshold THL of the total throughput, the downlink minimum contention window THLD_CWmin, and the downlink transmission allowable amount THLD are acquired from the parameter management table 32 (step S243), and the total throughput Total and the total throughput are acquired. Is compared with the threshold value THL (step S244).

  If it is determined in step S244 that the total throughput Total is equal to or greater than the threshold value THL, the minimum contention window of the currently set non-priority queue 112 (that is, the minimum downlink contention stored in the state management unit 33). It is determined whether or not the window THLD_CWmin has reached the maximum value (step S245). Generally, since the contention window takes a value from 0 to 1023, it is determined whether or not the minimum downlink contention window THLD_CWmin is 1023. If it is determined in step S245 that the minimum downlink contention window THLD_CWmin is not at the maximum value, the minimum downlink contention window TXLD_CWmin is calculated and determined by the above equation (1), and the state management unit 33 Store (step S246), increment the number of continuations n by 1 (step S247), and complete one process. If it is determined in step S245 that the downlink minimum contention window THLD_CWmin is the maximum value, the downlink transmission allowable amount THLD is calculated and determined by the following equation (3) and stored in the state management unit 33 ( In step S248), the continuation count k is increased by 1 (step S249), and one process is completed.

TXLD = THLD− (k * TX_OFF) (3)
However, TXLD ≧ 0

  On the other hand, if it is determined in step S244 that the total throughput Total is smaller than the threshold value THL, it is determined whether or not the continuation number n is 0 (step S250). Is determined to be 0 (step S251). If it is determined that the number of continuations k is 0, after the number of continuations n is decreased by 1 (step S252), the downlink minimum contention window TXLD_CWmin is calculated and determined by equation (1), and the state management unit 33 (Step S253), and one process is terminated.

  If it is determined in step S251 that the continuation count k is not 0, the continuation count k is decreased by 1 (step S254), and then the downlink transmission allowable amount THLD is calculated and determined by the equation (3). (Step S255), and one process is completed.

  When it is determined in step S250 that the continuation count n is 0, the downlink minimum contention window TXLD_CWmin and the downlink transmission allowable amount THLD are returned to the initial values and stored in the state management unit 33 (step S259). End the process. If it is determined in step S241 that the number N of simultaneous calls is 0, the continuation times n and k are reset to 0 (step S257), and the downlink minimum contention window TXLD_CWmin and the downlink transmission allowance THLD are initialized. The process is returned to and stored in the state management unit 33 (step S259), and one process is terminated.

  Then, when the minimum downlink contention window THLD_CWmin is set in the state management unit 33 by the restriction state determination unit 31, the restriction instruction unit 34 extracts the minimum downlink contention window THLD_CWmin from the state management unit 33, and the communication processing unit 10. The restriction processing unit 15 that has transmitted the restriction instruction to the restriction processing unit 15 and received the restriction instruction causes the QoS parameter setting function 152 to set the downlink minimum contention window TXLD_CWmin to the QoS parameter setting function 119 for the non-priority queue 112. Setting is made (step S257). Further, when the downlink transmission allowable amount THLD is set in the state management unit 33 by the restriction state determination unit 31, the restriction instruction unit 34 extracts the downlink transmission allowable amount THLD from the state management unit 33 and restricts the communication processing unit 10. The restriction processing unit 15 that transmits the restriction instruction to the processing unit 15 and receives the restriction instruction, the queuing interval control function 151 causes the queuing interval control function 151 to set the round robin interval to the queuing function 117 so that the downlink transmission allowable amount THLD is obtained. Setting is made (step S258).

  In this way, first, the downlink traffic of non-priority data is limited by the minimum contention window TXLD_CWmin, and when the minimum contention window TXLD_CWmin reaches the maximum value, the traffic is limited by the shaping process, thereby ensuring more reliable voice communication quality. Can be secured.

  In the above embodiment, QoS parameters are set for the traffic control of non-priority data or the non-priority data traffic is limited by shaping to ensure the quality of voice communication. However, these controls are effective only for TCP / IP communication. Therefore, UDP / IP communication performed by the general terminal 3b cannot be controlled, and these communications may affect the quality of voice communication. Therefore, in the third embodiment, among the general terminals 3b associated with the base station 2, the general terminal 3b performing a heavy load UDP / IP communication is forcibly removed from the base station 2 (disassociation is disconnected). Thus, a method for ensuring the quality of voice communication will be described.

(Example 3-1)
This control sets a threshold THL2 of the total throughput (upstream and downstream total throughput) of the general terminal 3b according to the number N of simultaneous calls, and disconnects the association of the general terminal 3b so that the total throughput becomes smaller than the threshold THL2. To do. Now, a method of regulating the communication processing unit 10 by the state determination / regulation instruction unit 30 will be described with reference to FIG.

  In this embodiment, the following processing is repeatedly executed at regular intervals. The parameter management table 32 stores the total throughput threshold THL2 of the general terminal 3b corresponding to the number N of simultaneous calls as shown in FIG. 10, and the number N of simultaneous calls as shown in FIG. An uplink throughput threshold value for UDP / IP communication per general terminal 3b with the number M of active terminals as a matrix (this is referred to as “allowable UDP throughput TH”) is stored.

  When this processing is executed, first, the regulation state determination unit 31 acquires the number N of simultaneous calls from the number of simultaneous calls measurement unit 21 of the traffic information acquisition unit 20 and the number of active terminals M from the number of active terminals measurement unit 23. (Step S300), and the total throughput threshold THL2 corresponding to the number N of simultaneous calls and the permissible UDP throughput TH corresponding to the number N of simultaneous calls and the number M of active terminals are extracted from the parameter management table 32 (step S300). Step S301). Next, the voice quality measuring unit 22 acquires the total throughput Total2 transmitted / received between the general terminal 3b and the base station 2 between the previous process and the current process (step S302). The measurement unit 22 obtains the UDP upstream throughput UTH (n) (n is the number of general terminals 3b performing UDP / IP communication from 1) for each general terminal 3b performing UDP / IP communication (Step 1). S303).

It is determined whether or not the total throughput Total2 of the general terminal 3b acquired in this way is equal to or greater than the total throughput threshold THL2 (step S304). If the total throughput Total2 is equal to or greater than the threshold THL2, then the general terminal 3b UDP uplink throughput TH_UDP (n
) And the permissible UDP throughput TH (step S305), and if there is a general terminal 3b that exceeds at least one, state information is managed that restricts the general terminal 3b performing UDP / IP communication to be forcibly removed. The data is stored in the unit 33 (step S306), and one process is terminated. If the total throughput Total2 is smaller than the threshold value THL2 in step S304, and if there is no general terminal 3b exceeding the allowable UDP throughput TH in step S305, one process is terminated as it is.

  When the restriction information is stored in the state management unit 33, the restriction instruction unit 34 transmits the restriction instruction to the restriction processing unit 15, and the restriction processing unit 15 that has received the restriction instruction uses the wireless control function 153 to perform the general terminal operation. Among the 3b, the association with the general terminal 3b having a large uplink throughput in the UDP / IP communication is disconnected and the general terminal 3b is detached.

  According to such a configuration, the general terminal 3b performing UDP / IP communication is forcibly disconnected from the base station 2 until the total throughput Total2 of the general terminal 3b becomes smaller than the threshold value THL2. Traffic can be reduced to ensure voice communication quality. Since it is determined whether or not the general terminal 3b is forcibly disconnected based on the permissible UDP throughput TH per general terminal 3b, the terminal 3 (general terminal 3b) that performs communication using normal traffic is determined. Communication is not interrupted because the association is disconnected.

(Example 3-2)
In the third embodiment, it is possible to control the general terminal 3b to be forcibly disconnected only by the number N of simultaneous calls without considering the number M of active terminals. FIG. It explains using. In this case, the parameter management table 32 stores only the general terminal total throughput threshold THL2 for the number N of simultaneous calls shown in FIG.

  When this process is executed, first, the restriction state determination unit 31 acquires the number N of simultaneous calls from the number of simultaneous calls measuring unit 21 of the traffic information acquisition unit 20 (step S310), and the total number corresponding to the number N of simultaneous calls is obtained. The throughput threshold value THL2 is extracted from the parameter management table 32 (step S311). Next, the total throughput Total2 transmitted between the general terminal 3b between the previous process and the current process is acquired by the voice quality measuring unit 22 (step S312), and the voice quality measuring unit 22 For each general terminal 3b performing UDP / IP communication, the UDP upstream throughput UTH (n) (n is the number of general terminals 3b performing UDP / IP communication from 1) is acquired (step S313).

  It is determined whether or not the total throughput Total2 of the general terminal 3b acquired in this way is equal to or greater than the total throughput threshold THL2 (step S314). If the total throughput Total2 is equal to or greater than the threshold THL2, UDP / IP communication is performed. The control information for forcibly leaving the general terminal 3b is stored in the state management unit 33 (step S315), and one process is terminated. In step S314, when the total throughput Total2 is smaller than the threshold value THL2, one process is finished as it is.

  When the restriction information is stored in the state management unit 33, the restriction instruction unit 34 transmits the restriction instruction to the restriction processing unit 15, and the restriction processing unit 15 that has received the restriction instruction uses the wireless control function 153 to perform the general terminal operation. 3b, disconnects the general terminal 3b from the base station 2 by disconnecting the association with the general terminal 3b having a large uplink throughput in UDP / IP communication (step S316).

  Even in such a configuration, the general terminal 3b performing UDP / IP communication is forcibly disconnected from the base station 2 until the total throughput Total2 of the general terminal 3b becomes smaller than the threshold value THL2. Thus, the quality of voice communication can be ensured.

  By the way, in the above first to third embodiments, as shown in FIG. 2, the case where the base station 2 performs the control of the wireless communication with the terminal 3 has been described, but as shown in FIG. 1, It is also possible to connect the controller 6 to the wired network 5 to which the base station 2 is connected, and to implement a part of the functions of the base station 2 in the controller 6. The case where it comprises with the base station 2 and the controller 6 is demonstrated using FIG. 14 and FIG. In the following description, the same components as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 14, a plurality of base stations 2 are collectively controlled by the controller 6, and the traffic information acquisition unit 20 and the state determination / regulation instruction unit 30 (30 ′) are mounted on the controller 6. In this configuration, since the controller 6 communicates with the base station 2 via the wired network 5, a wired transmission / reception unit 13 ′ and a wired I / F unit 14 ′ are mounted. Are sent and received via Therefore, part of the functions of the restriction processing unit 15 is executed by the restriction processing unit 15 ′ mounted on the controller 6. Specifically, the restriction processing unit 15 installed in the base station 2 executes new call connection restriction for voice communication, and the restriction processing unit 15 ′ installed in the controller 6 performs the new connection restriction for the terminal 3 and The disconnection of the non-voice communication terminal 3 is executed. The regulation instruction transmitted from the regulation instruction unit 34 is transmitted to the regulation processing unit 15 via the regulation processing unit 15 ′.

  FIG. 15 shows a case where the traffic information acquisition unit 20 is installed in the base station 2 and only the state determination / regulation instruction unit 30 (30 ′) is implemented in the controller 6. In this case, information transmitted / received between the base station 2 and the controller 6 is traffic information and a regulation instruction, and a packet transmitted / received between the terminal 3 and the upper network 4 via the base station 2 does not pass through the controller 6.

  As described above, since the controller 6 is configured to control the base station 2 by setting the restriction state of the base station 2 and implementing the function of controlling the base station 2, the controller 6 can collectively control the base station 2. The LAN network 1 can be effectively controlled. In particular, in the wireless LAN network 1, since the terminal 3 moves between a plurality of base stations 2, the base station 2 to be associated is also used as the destination, so that it is effective to manage the whole with the controller 6. Is.

  In the above embodiment, the case where the communication system according to the present invention is applied to the wireless LAN system 1 in which the base station 2 and the terminal 3 perform wireless communication has been described. However, the present invention is not limited to this. For example, the present invention can be applied to a PLC communication system that performs communication using a power line as a medium.

  As described above, according to the base station 2 according to the present embodiment, even when a terminal in which priority control is implemented (priority terminal 3a) and a terminal in which the priority control is not implemented (general terminal 3b) are mixed and associated, By controlling the priority packet (non-priority data), the quality of priority communication (voice communication) can be ensured. Of course, even when only the priority terminal 3a capable of priority control is associated with the base station 2, the quality of the priority communication can be ensured by the control of the base station 2 according to the present embodiment.

1 is a block diagram showing a configuration of a wireless LAN system according to the present invention. It is a block diagram which shows the structure of a base station. It is a block diagram which shows the principal part of the radio | wireless communication process in a base station. It is a figure which shows the structure of an EDCA parameter table and a set, (a) is a figure which shows the structure of an EDCA parameter table, (b) is a figure which shows the parameter set which concerns on Example 1-1, (c) These are the figures which show the parameter set which concerns on Example 1-2. It is a flowchart which shows the process of 1st Example. It is explanatory drawing for demonstrating the control method which concerns on 2nd Example. It is a flowchart which shows the process of Example 2-1. It is a flowchart which shows the process of Example 2-2. It is a flowchart which shows the process of Example 2-3. It is a table which shows the total throughput threshold value of a general terminal with respect to the number of simultaneous calls. It is a table which shows the UDP uplink throughput per general terminal with respect to the number of simultaneous calls and the number of active terminals. It is a flowchart which shows the process of Example 3-1. It is a flowchart which shows the process of Example 3-2. It is a block diagram when it comprises with a base station and a controller, Comprising: The case where it comprises so that all the packets may be exchanged with a high-order network via a controller is shown. It is a block diagram when it comprises with a base station and a controller, Comprising: The case where only a regulation process is mounted in the controller is shown.

Explanation of symbols

2 Base station (communication equipment)
3 terminal 3b general terminal 11 wireless transmission / reception unit (transmission means)
21. Simultaneous call number measurement unit (simultaneous call number measurement means)
22 Voice quality measurement unit (throughput measurement means)
23 Active terminal number measuring unit (active terminal number measuring means)
30 State determination / regulation instruction section (control means)
32 Parameter management table (parameter storage means)

Claims (10)

A communication device that associates with a terminal and transmits / receives a packet to / from the associated terminal;
Transmitting means for transmitting the packet to the terminal;
Simultaneous communication number measuring means for detecting a packet corresponding to priority communication to be prioritized in the transmission and reception and measuring the number of simultaneous communication that is the number of communication of the priority communication;
And a control unit configured to control a traffic amount of the packet transmitted to the terminal by the transmission unit according to the number of simultaneous communication measured by the simultaneous communication number measurement unit. A communication device that associates with a terminal and transmits / receives a packet to / from the associated terminal;
Transmitting means for transmitting the packet to the terminal;
Active number measuring means for measuring the number of active terminals, which is the number of connections of the terminals that are associated with each other;
Simultaneous communication number measuring means for detecting a packet corresponding to priority communication to be prioritized in the transmission and reception and measuring the number of simultaneous communication that is the number of communication of the priority communication;
Control the traffic volume of the packet transmitted to the terminal by the transmitting means according to the number of simultaneous communications measured by the simultaneous communication number measuring means and the number of active terminals measured by the active number measuring means. A communication device. The transmitting means is configured to transmit the packet to the terminal according to a parameter;
The communication apparatus according to claim 1, wherein the control unit is configured to control the traffic amount by setting the parameter of the transmission unit. A communication device that associates with a terminal and transmits / receives a packet to / from the associated terminal;
Transmitting means for transmitting the packet to the terminal;
Simultaneous communication number measuring means for detecting a packet corresponding to priority communication to be prioritized in the transmission and reception and measuring the number of simultaneous communication that is the number of communication of the priority communication;
A throughput measuring means for measuring a throughput of the packet transmitted / received to / from a terminal that cannot directly control a traffic amount of the packet transmitted from the terminal among the terminals that are associated;
Parameter storage means for storing the throughput threshold of the terminal that cannot be directly controlled and is allowed to ensure the quality of the priority communication with respect to the simultaneous communication number;
The threshold value corresponding to the simultaneous communication number measured by the simultaneous communication number measurement unit is extracted from the parameter storage unit, and the terminal that cannot be directly controlled by the transmission unit when the throughput is equal to or greater than the threshold value And a control means for controlling the traffic amount of the packet transmitted to the communication device. The transmitting means is configured to transmit the packet to the terminal according to a QoS parameter;
5. The communication apparatus according to claim 4, wherein the control unit is configured to control the traffic amount by setting the QoS parameter of the transmission unit. The transmission means is configured to adjust the traffic volume by shaping the packet transmitted to the terminal according to a traffic parameter,
5. The communication apparatus according to claim 4, wherein the control unit is configured to control the traffic amount by setting the traffic parameter of the transmission unit. A communication device that associates with a terminal and transmits / receives a packet to / from the associated terminal;
Transmitting means configured to transmit the packet to the terminal according to a QoS parameter, and to adjust the traffic amount by shaping the packet transmitted to the terminal according to a traffic parameter;
Simultaneous communication number measuring means for detecting a packet corresponding to priority communication to be prioritized in the transmission and reception and measuring the number of simultaneous communication that is the number of communication of the priority communication;
A throughput measuring means for measuring a throughput of the packet transmitted / received to / from a terminal that cannot directly control a traffic amount of the packet transmitted from the terminal among the terminals that are associated;
Parameter storage means for storing a threshold value of the throughput of the terminal that cannot be directly controlled and is allowed to ensure the quality of the priority communication with respect to the simultaneous communication number;
The terminal that cannot be directly controlled by extracting the threshold corresponding to the number of simultaneous communications from the parameter storage means and setting the QoS parameter in the transmission means when the throughput is equal to or greater than a predetermined threshold Is transmitted to the terminal that cannot be directly controlled by setting the traffic parameter in the transmission means when the QoS parameter reaches a limit value. And a control means for controlling the amount of traffic by shaping the packet to be processed. The control means is
Memorize the number of continuations of traffic volume regulation;
When the throughput is equal to or greater than a predetermined threshold, the number of continuations is increased, and when the throughput is smaller than a predetermined threshold, the number of continuations is decreased.
The communication apparatus according to claim 4, wherein the transmission unit is controlled to increase or decrease the traffic amount according to the number of continuations. A communication device that associates with a terminal and transmits / receives a packet to / from the associated terminal;
Simultaneous communication number measuring means for detecting a packet corresponding to priority communication to be prioritized in the transmission and reception and measuring the number of simultaneous communication that is the number of communication of the priority communication;
Active number measuring means for measuring the number of active terminals, which is the number of connected terminals that cannot directly control the traffic volume of the packet transmitted from the terminal, among the terminals that are associated with each other, and the direct control A throughput measuring means for measuring a total throughput of packets transmitted / received to / from a terminal that cannot be controlled, and measuring an uplink throughput of a UDP / IP packet transmitted from the terminal for each terminal that cannot be directly controlled; ,
A threshold for the total throughput transmitted / received to / from the terminal that cannot be directly controlled, which is allowed to ensure the quality of the priority communication, and the number of simultaneous communication and the number of active terminals. And parameter storage means for storing a threshold of the uplink throughput per terminal that is allowed to ensure the quality of the priority communication and cannot be directly controlled, and
The threshold of the total throughput with respect to the number of simultaneous communications and the threshold of the uplink throughput corresponding to the number of simultaneous communications and the number of active terminals are extracted from the parameter storage unit, and the total throughput measured by the throughput measuring unit is When the uplink throughput of any of the terminals exceeds the uplink throughput threshold when the uplink throughput is greater than or equal to the threshold of the total throughput, until the total throughput becomes smaller than the threshold of the total throughput, And a control unit that disconnects the association of the large terminal that cannot be directly controlled. A communication device that associates with a terminal and transmits / receives a packet to / from the associated terminal;
Simultaneous communication number measuring means for detecting a packet corresponding to priority communication to be prioritized in the transmission and reception and measuring the number of simultaneous communication that is the number of communication of the priority communication;
Measure the total throughput of packets sent to and received from the terminals that cannot be directly controlled, and measure the uplink throughput of UDP / IP packets transmitted from the terminals for each terminal that cannot be directly controlled Throughput measurement means;
Parameter storage means for storing a threshold value of the total throughput transmitted / received to / from the terminal that cannot be directly controlled, which is allowed to ensure the quality of the priority communication, with respect to the number of simultaneous communications;
When the total throughput threshold for the number of simultaneous communications measured by the simultaneous communication number measuring unit is extracted from the parameter storage unit, and the total throughput measured by the throughput measuring unit is equal to or greater than the total throughput threshold And a control unit that disconnects the association of the terminal that cannot be directly controlled with the large uplink throughput until the total throughput becomes smaller than the threshold of the total throughput.

Images