JP2008311695A - Access controller and access control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To determine a resource state in each of radio APs (access points) to control call according to the resource state in a radio IP telephone system employing a radio LAN technique for connecting the radio APs by radio. <P>SOLUTION: An access controller in the radio IP telephone system has: a means for receiving an inquiry about a resource state from a VoIP call control means which has received a call connection request concerning an incoming call to a terminal connected to a communication radio AP; a means for detecting the communication radio AP and a path radio AP connected to this communication radio AP, and determining the resource states of the APs; and a means for notifying the VoIP call control means of a result of determination. The means for determining the resource state has a means for determining whether or not the path radio AP is in a radio interference state and whether or not the communication radio AP is in a radio interference state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wireless IP telephone system using wireless LAN technology for wirelessly connecting wireless access points (hereinafter referred to as wireless APs).

  WDS (Wireless Distribution System) technology for wirelessly connecting wireless APs has become widespread. A configuration example of a conventional wireless IP telephone system using this technology is shown in FIG. As shown in FIG. 1, the wireless IP telephone system includes a plurality of call wireless APs that are directly connected to a terminal wirelessly, wirelessly connected to the call wireless AP, and relay between the call wireless AP and another device. And a SIP server 40 that performs call control for IP telephones. The SIP server 40 and each path wireless AP are connected to a network such as the Internet (also called a wired network). In this system, a voice channel is established between terminals by call connection processing based on SIP, and voice communication by RTP is performed. In the system shown in FIG. 1, the route wireless AP has one stage, but the route wireless AP may have a plurality of stages. The conventional wireless IP telephone system shown in FIG. 1 has the following problems.

  In a state where a large number of terminals are connected to the call wireless AP 10 in the system of FIG. 1 and a bandwidth close to the limit is used in the call wireless AP 10, the call wireless AP 10 exists but is still connected to the call. It is assumed that a new call connection request for the terminal 1 that does not exist is transmitted from the terminal 2. As a result, a bandwidth for the call of the terminal 1 is allocated to the call wireless AP 10, a voice channel is established between the terminal 1 and the caller terminal 2, and voice communication is performed.

  However, since the call wireless AP 10 used a band that is close to the limit before the connection of the terminal 1, the connection of the terminal 1 further consumes the band of the call wireless AP 10, and the call wireless AP 10 is in a congested state. Become. Therefore, not only good voice quality cannot be obtained at the terminal 1, but also the voice quality at all terminals originally connected to the call wireless AP 10 is lowered, and noise, missing sound, communication disconnection, etc. occur.

  As a technique for solving such a problem in the conventional wireless IP telephone system, there is a technique described in Patent Document 1. In this technology, the access controller manages the congestion status of a wireless AP (corresponding to a call wireless AP) connected to the terminal, the terminal, and the wireless AP, and receives an incoming request to the terminal and a outgoing request from the terminal. When received, the call connection is controlled according to the congestion status of the wireless AP. With this technology, when the wireless AP is congested, it is possible to control so as not to make a call connection, and the above problem is solved.

  Further, in the wireless IP telephone system shown in FIG. 1, when the bandwidth between the route wireless AP and the call wireless AP or the bandwidth between the route wireless APs is not sufficient, a new call connection is controlled by the route wireless AP as described above. May reduce voice quality on all terminals. In addition, in a case where a real-time property is required like a wireless IP phone, it is necessary to secure a sufficient bandwidth throughout the entire wireless path and avoid an increase in delay amount. This problem can be solved using, for example, the technique described in Non-Patent Document 3. In the technique described in Non-Patent Document 3, each wireless AP including a route wireless AP and a call wireless AP acquires wireless AP band information of all wireless APs in an autonomous and distributed manner. When there is a connection request of a terminal to a certain wireless AP, the wireless AP performs a band inspection between all wireless APs and a band inspection between the wireless AP and the terminal, and determines whether to accept the connection. is doing.

As prior art documents related to the present application, there are the following Non-Patent Document 1, Non-Patent Document 2, and Non-Patent Document 4, in addition to Patent Document 1 and Non-Patent Document 3. Non-Patent Document 1, Non-Patent Document 2, and Non-Patent Document 4 define IEEE 802.11 wireless LAN systems.
JP 2007-135194 A Second generation low power data communication system / wireless LAN system standard, ARIB STD-T66 10th edition, Radio Industry Association, established in 1999 Low-power data system / wideband mobile access system (CSMA) standard, ARIB STD-T71 10th edition, Radio Industry Association, established in 2000 Communication quality control technology for wireless LAN (4/6) -Distributed control terminal admission control method for multi-hop network-, IEICE 2007 General Conference, B-5-173 IEEE802.11e-2005: Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications

  The conventional wireless IP telephone system shown in FIG. 1 has the following problems in addition to the congestion problem. Further, the techniques described in Patent Document 1 and Non-Patent Document 3 solve the problem of congestion due to insufficient bandwidth, but the following problems remain. In this specification, “wireless AP” means a route wireless AP or a call wireless AP unless otherwise specified, and is used when it is not necessary to limit either one.

  In the wireless IP telephone system, an IEEE802.11 wireless LAN represented by IEEE802.11b / g is mainly used. In such a wireless LAN, if there is another wireless AP using the same wireless channel as the wireless channel used by the wireless AP in the vicinity of the wireless AP, radio interference between the wireless APs occurs. In addition, the 2.4 GHz band, which is the frequency band used by IEEE802.11b / g, is the same frequency band as radio waves used by devices other than wireless LAN, such as microwave ovens, industrial machines, and medical devices. In some cases, it may be subject to radio wave interference from radio waves.

  When such radio wave interference occurs, radio wave resources in the wireless AP are substantially limited, and the same problem as in the case of congestion may occur. That is, in a situation where radio wave interference occurs in either the route wireless AP or the call wireless AP, the terminal is connected to the call wireless AP even though neither the route wireless AP nor the call wireless AP is in a congested state. When the communication is performed, there is a problem that the terminal cannot perform stable communication, or the communication quality of other terminals under the call wireless AP or the route wireless AP may be deteriorated.

  Further, IEEE802.11 wireless LAN such as IEEE802.11a / b / g adopts a specification that changes the modulation method depending on the communication status between a wireless AP and a terminal or between wireless APs. For example, when the terminal is far from the call wireless AP, that is, when the radio wave intensity of the terminal in the call wireless AP is low, communication is performed using a modulation scheme that is less efficient than when the terminal is close to the call wireless AP. This means that the call wireless AP uses more resources for distant terminals than resources used for near terminals. Therefore, when a terminal far from the calling wireless AP performs communication, not only the communication quality of the terminal itself is likely to be inferior, but also the communication quality can be deteriorated for all terminals connected under the calling wireless AP. Increases the nature.

  The present invention has been made in view of the above points, and in a wireless IP telephone system using wireless LAN technology for wirelessly connecting between wireless APs, a resource state such as a radio wave interference state in each wireless AP is determined, An object of the present invention is to provide a technique for performing call control according to the resource state of each wireless AP.

  The above-described problem is a radio having a call radio AP that is wirelessly connected to a terminal, at least one path radio AP that relays communication between the call radio AP and another device, and a VoIP call control unit. An access control apparatus in an IP telephone system, wherein a resource status of the terminal is received from the VoIP call control means that has received a call connection request related to an incoming call to the terminal connected to the call wireless AP or an outgoing call from the terminal Receiving means for receiving an inquiry; and, in response to receiving an inquiry about a resource state relating to the terminal, the call wireless AP connected to the terminal, and the route wireless AP connected to the call wireless AP Resource state determination means for detecting the resource state of the call wireless AP and the route wireless AP, and determination by the resource state determination means Notification means for notifying the VoIP call control means of the result, the resource state determination means obtains radio wave interference state information indicating a radio wave interference state of the path wireless AP, and determines the radio wave interference state information as predetermined. Means for determining whether or not the path wireless AP is in radio wave interference by obtaining a radio wave interference state information indicating a radio wave interference state of the call radio AP, and This can be solved by an access control device comprising means for comparing the information and a predetermined threshold value to determine whether or not the call wireless AP is in radio wave interference.

  The access control device may store, in a storage unit, table information that associates and holds a call wireless AP and a route wireless AP connected to the call wireless AP. In this case, the resource state determination unit includes: The route wireless AP corresponding to the call wireless AP connected to the terminal is detected with reference to the table information.

  The resource state determination unit acquires radio wave state information indicating a radio wave state of the call radio AP, and compares the radio wave state information with a predetermined threshold value to determine whether the call radio AP is in a low radio wave state. Determining whether or not the terminal is in a low radio wave state by acquiring radio wave state information indicating the radio wave state of the terminal and comparing the radio wave state information with a predetermined threshold. It is good also as having a means to determine.

  The resource state determination means may further include means for determining whether the route wireless AP is congested and means for determining whether the call wireless AP is congested. Good.

  The notification unit may notify the VoIP call control unit of a determination result indicating that the resource state is normal when the determination result of all the units included in the resource state determination unit is good. Good. In addition, the notifying unit displays a determination result indicating that the resource state is abnormal when the determination result of at least one of the plurality of determinations that can be executed by the resource state determining unit is not good. It is good also as notifying to a control means.

  According to the present invention, in response to receiving an inquiry about a resource state related to a terminal, a call wireless AP connected to the terminal and at least one stage of route wireless AP connected to the call wireless AP Detecting and determining the resource state such as the radio wave interference state of the call radio AP and the route radio AP and notifying the determination result to the VoIP call control means, it is possible to realize call control according to the radio wave interference state of each radio AP. As a result, for example, if any one of the call wireless AP and the route wireless AP is in radio wave interference, it is possible to prevent the call connection, so that it is possible to prevent a connection in which the communication quality cannot be guaranteed, It is possible to solve the conventional problem that the communication quality of the other terminal connected under the call wireless AP or the path wireless AP under radio wave interference is deteriorated by the new connection of the terminal.

  Further, by further determining whether or not the terminal or the wireless AP is in a low radio wave state, by performing call control according to the determination result, it is possible to avoid the terminal itself making a low-quality call, Connections in which communication quality cannot be guaranteed can be prevented, and problems that deteriorate the communication quality of other terminals can be solved.

  Embodiments of the present invention will be described below with reference to the drawings.

(System overview)
FIG. 2 shows an example of a system in the embodiment of the present invention. The system shown in FIG. 2 is obtained by adding an access controller 30 to the system shown in FIG. The access controller 30 can also be provided in a wireless LAN switch that connects a plurality of wireless APs. Further, the identification number such as “01” given to each wireless AP in FIG. 2 corresponds to the identification number of the wireless AP in the sequence and database described below.

  In FIG. 2, the route wireless AP has a single-stage configuration, but it is needless to say that a multi-stage configuration may be used. When the route wireless AP is multistage, one route wireless AP among a plurality of route wireless APs constituting the multistage is connected to the wired network, and the other route wireless AP is not connected to the wired network. In the present embodiment, there is one communication path between a call wireless AP and a wired network.

  Each wireless AP in the system of FIG. 2 measures the radio wave state (radio wave intensity in the present embodiment) of the terminal or the wireless AP based on a signal received from the terminal or wireless AP under the wireless AP, and this is used as the terminal. A function of storing the information in association with the identification information, and a function of transmitting the information to the access controller 30 based on a request from the access controller 30. Further, each wireless AP in the system of FIG. 2 has a function of acquiring and storing information indicating a radio wave interference state, and a function of transmitting the information to the access controller 30 based on a request from the access controller 30. Have.

  Further, the access controller 30 in the system of FIG. 2 has a function of managing a bandwidth allocation state for each wireless AP and each terminal, a function of acquiring information on a radio wave state of a terminal under the wireless AP or the wireless AP from the wireless AP, and It has a function of acquiring information indicating the radio wave interference state of the wireless AP from the wireless AP. Further, the access controller 30 has a function of determining whether or not to make a bandwidth reservation for the wireless AP based on these data. The SIP server 40 has a function of transmitting a bandwidth reservation request corresponding to a resource status inquiry to the access controller 30 in response to the occurrence of VoIP communication, and performing call control according to the response content to the bandwidth reservation request. In the present specification and claims, “resource” means all resources used for communication unless otherwise specified. The “resource state” is a state of the resource, and includes, for example, a radio wave state of the terminal or the wireless AP, a radio wave interference state of the wireless AP, a use band of the wireless AP, and the like.

  An outline of the operation of the system according to the present embodiment will be described with reference to FIG. In FIG. 3, it is assumed that the terminal 1 is under the call wireless AP 10 but has not been connected yet. In this state, when a call connection request for the terminal 1 is transmitted from the source terminal 2 to the SIP server 40 (step A), the SIP server 40 calls the access controller 30 to call the terminal 1 that is the destination terminal. A bandwidth reservation request is transmitted (step B). The access controller 30 acquires the radio wave interference state information of the route wireless AP 20, the radio wave state information of the call wireless AP 10, and the congestion state information of the route wireless AP 20, and when any of these does not satisfy a predetermined condition Then, the SIP server 40 is notified that resources cannot be allocated to the terminal 1 (step C). In addition, when the radio wave interference state of the route wireless AP 20, the radio wave state of the call wireless AP, and the congestion state of the route wireless AP 20 are all good, the access controller 30 determines the radio wave interference state information of the call wireless AP 10 and the terminal 1. The radio wave state information and the congestion state information of the call wireless AP 10 are acquired, and when there is one that does not satisfy a predetermined condition, the SIP server 40 is notified that the resource cannot be allocated to the terminal 1 ( Step C). The SIP server 40 receives the notification at step C, and transmits busy to the caller terminal 2 as a response to the call connection request at step A (step D).

  FIG. 4 is a flowchart showing the determination process of the access controller 30. FIG. 4 shows an example in which the route wireless AP 20 has multiple stages. As shown in this figure, when the access controller 30 receives a bandwidth reservation request (resource status inquiry) related to the terminal 1 from the SIP server 40 (step 1), first, the access controller 30 sets the call wireless AP 10 connected to the terminal 1 by radio link. The path wireless AP 20 that is detected and connected to the path wireless AP 20 is detected, and information indicating the radio wave interference state of the path wireless AP 20 is acquired from the path wireless AP 20 (step 2). It is checked whether or not it is less than a predetermined radio wave interference threshold value, and if it is less than the radio wave interference threshold value, the process proceeds to step 4 (step 3). If the information indicating the radio wave interference state of the path wireless AP 20 is equal to or greater than the radio wave interference threshold value in step 3, it is determined that the terminal 1 and the terminal 2 should not be connected because the path wireless AP 20 is in radio wave interference, and the path wireless AP Without making a bandwidth reservation for the AP 20, a response indicating that radio wave interference is occurring is transmitted to the SIP server 40 (step 20).

  In step 4, the access controller 30 acquires the radio field intensity of the path radio AP or the call radio AP 10 under the path radio AP 20 from the path radio AP 20, and checks whether it is greater than a predetermined radio field intensity threshold. If it is larger than the radio field intensity threshold value, the process proceeds to step 6 (step 5). When the radio field intensity is equal to or less than a predetermined radio field intensity threshold, it is determined that the target path wireless AP or the call radio AP 10 is in a low radio wave state and the terminal 1 and the terminal 2 should not be connected, and the bandwidth for the path radio AP 20 Without making a reservation, a response indicating that the radio wave condition is low is transmitted to the SIP server 40 (step 21).

  In step 6, the access controller 30 checks whether or not the route wireless AP 20 is congested. If it is congested, the access controller 30 determines that the terminal 1 and the terminal 2 should not be connected, and sends a response indicating that it is congested. It transmits to the SIP server 40 (step 22). If the route wireless AP 20 is not congested, the process proceeds to step 7.

  In step 7, it is checked whether or not the processing for the all-path wireless AP has been completed. As is clear from the processing in step 4, the determination of the low radio wave state applies to the route wireless AP and the call wireless AP on the route excluding the route wireless AP connected to the wired network. If it is determined in step 7 that the processing for all the path wireless APs has not been completed, the process returns to step 2 and the processes in steps 2 to 6 are performed for the unprocessed path wireless AP. If it is determined in step 7 that the processing for all path wireless APs on the path between the wired network and the call wireless AP 10 has been completed, the process proceeds to step 8.

  In step 8, the access controller 30 acquires information indicating the radio wave interference state of the call radio AP 10 that is wirelessly connected to the terminal 1 from the call radio AP 10, and checks whether it is less than a predetermined radio wave interference threshold. If it is less than the radio wave interference threshold value, the process proceeds to step 10 (step 9). If the information indicating the radio wave interference state of the call radio AP 10 is greater than or equal to the radio wave interference threshold value in step 9, it is determined that the call radio AP 10 is in radio wave interference and thus the terminal 1 and the terminal 2 should not be connected, and the call radio Without making a band reservation for the AP 10, a response indicating that radio wave interference is occurring is transmitted to the SIP server 40 (step 23).

  In step 10, the access controller 30 acquires the radio field intensity of the terminal 1 from the call radio AP 10, checks whether it is greater than a predetermined radio field intensity threshold, and proceeds to the processing in step 12 if it is greater than the radio field intensity threshold ( Step 11). If the radio field intensity of the terminal 1 is equal to or less than a predetermined radio field intensity threshold, it is determined that the terminal 1 is in a low radio wave state and the terminal 1 and the terminal 2 should not be connected, and no bandwidth reservation is made for the call radio AP 10 Then, a response indicating that the radio wave condition is low is transmitted to the SIP server 40 (step 24).

  In step 12, the access controller 30 checks whether or not the call wireless AP 10 is congested. If it is congested, the access controller 30 determines that the terminal 1 and the terminal 2 should not be connected, and sends a response indicating that it is congested. It transmits to the SIP server 40 (step 25).

  If all conditions are satisfied, a response indicating bandwidth reservation OK is transmitted to the SIP server 40 in step 13. Thereafter, a voice call is performed between the terminal 1 and the terminal 2 through a sequence for connection between the terminal 1 and the terminal 2. On the other hand, after steps 20 to 25, for example, the SIP server 40 notifies the terminal 2 of busy.

  In this embodiment, a CU (Channel Utilization) value, the number of retry packets, a packet transmission dispersion value, and a packet reception dispersion value are used as information indicating the radio wave interference state, and any one of these four is used. If it is smaller than a predetermined threshold, it is determined that radio wave interference is not occurring. That is, it is determined that radio interference is occurring when all of these are equal to or greater than the threshold value. Note that it is also possible to determine that radio wave interference is occurring when one of these is equal to or greater than a predetermined threshold. Various combinations of the four parameters may be provided such that it is determined that radio interference is not occurring if a predetermined number of the four parameters is smaller than a predetermined threshold.

  The C.U. value is a channel utilization rate and is a value indicating a radio wave usage state including radio waves from radio wave generation sources other than the target wireless AP. The number of retry packets is the number of packets that the wireless AP has retransmitted per unit time. Both of these values are large during radio wave interference. The packet transmission variance value is a packet transmission variance value. If radio wave interference is small, packets can be transmitted at regular intervals, but if radio wave interference is large, packets cannot be transmitted frequently, resulting in variations in packet transmission and dispersion. The value increases. The packet reception dispersion value is a dispersion value for packet reception, and the value increases in a state where radio wave interference is large, similarly to the packet transmission dispersion value.

  In this embodiment, not only when the wireless AP is congested, but also when there is a large radio wave interference in the wireless AP, or when the radio wave condition of the connected terminal or the wireless AP is not good, a new call connection is not made. This eliminates the problems of the prior art. In addition, although busy return was demonstrated as a process of the SIP server 40 at the time of congestion, this is only an example and various other processes are possible.

(System operation details)
Next, the operation of the system according to the present embodiment will be described in detail with reference to a sequence diagram. Here, a case where the communication path is a path passing through the call radio AP01 and the path radio AP05 in the system shown in FIG. 2 is taken as an example. In each sequence diagram, the structure of data held in each apparatus is shown as appropriate. In addition, although the registrar and the SIP server are shown in the sequence diagram, they may be separate devices, or the registrar may be included in the SIP server. This registrar has functions similar to those of a general SIP-based registrar. In each sequence, MSID indicates the MAC address of the terminal, APID indicates the ID of the wireless AP, and URI indicates the SIP-URI.

  First, a sequence for registering the VoIP terminal 1 (hereinafter referred to as terminal 1) in the access controller will be described with reference to FIG. The registration process shown in FIG. 5 is automatically performed, for example, when the terminal 1 is turned on. Further, at the time shown in FIG. 5, the access controller is registered in the SIP server, and message transmission / reception based on SIP is possible between the access controller and the SIP server.

  In step 1 of FIG. 5, wireless link connection processing and authentication processing in the wireless LAN are performed between the terminal 1 and the call wireless AP01. Here, the call radio AP01 acquires and registers the MAC address (MSID) of the terminal 1 (step 2). The call radio AP01 transmits a terminal registration request including the ID (AP01) of the call radio AP01 and the MAC address (MS01) of the terminal 1 to the access controller (step 3). The access controller registers the ID (AP01) of the call radio AP01 received from the call radio AP01 and the MAC address (MS01) of the terminal 1 by storing them in the storage device (step 4). Then, the access controller returns a terminal registration response to the call wireless AP01 (step 5).

  In step 6, the terminal 1 transmits a SIP register message to the registrar. The message to be transmitted includes MS01 and the URI (URI1) of terminal 1. The registrar performs normal register processing and transmits a URI registration request including MS01 and URI1 to the access controller (step 7). The access controller validates the URI by storing URI1 in association with AP01 and MS01 (step 8), and sends a URI registration response to the registrar (step 9). Then, the registrar returns a response to the register message in step 6 to the terminal 1 (step 10).

  In the example described here, the MAC address and URI of the terminal are stored in the access controller in the sequence, but these data are stored in advance in the access controller and only state changes are recorded. It is good. In this case, for example, AP01 is recorded in association with MS01 registered in advance in step 4, and information that URI1 is valid is recorded in association with AP01, MS01, and URI1 in step 8. The same applies to other embodiments.

  Next, processing for deleting the registered terminal 1 from the access controller will be described with reference to FIG. The process shown in FIG. 6 is executed when the terminal 1 is turned off, for example.

  In step 1 of FIG. 6, the terminal 1 transmits a register message including a registration deletion command to the registrar. The registrar sends a URI deletion request to the access controller (step 2), and the access controller that receives this request invalidates the URI by deleting URI1 from the database (step 3). The access controller returns a URI deletion response (step 4), and the registrar returns a response to the terminal 1 (step 5).

  In step 6, the terminal 1 executes a wireless LAN process when the terminal 1 leaves the calling wireless AP 01 (disconnects the wireless link with the calling wireless AP), and in response to this, the calling wireless AP 01 deletes the MSID (step S1). 7) A terminal deletion request is transmitted to the access controller (step 8), and the access controller that receives this deletes AP01 and MS01 from the database (step 9), and returns a terminal deletion response to the call radio AP01 (step 10). .

  Next, with reference to FIG. 7 to FIG. 9, an operation when an incoming request is made to the terminal 1 from the terminal 2 when all resource states are good will be described. In the following figure, the registrar is not shown.

  The source terminal 2 transmits a call connection request (INVITE) to the SIP server (step 1). The SIP server that has received the INVITE transmits a QoS reservation request including the source terminal URI (URI2), the destination terminal URI (URI1), and the necessary bandwidth to the access controller (step 2). The access controller searches the database based on the destination URI 1 and extracts the call wireless AP01 having the terminal 1 under its control. Based on this, the call controller searches the call information management data, which is connection information between the wireless APs, and subordinates the call wireless AP01. The route wireless AP 05 is extracted (step 3).

  Then, the access controller transmits a radio wave interference state request to the path wireless AP 05 (step 4), and the path wireless AP 05 transmits information indicating its own radio wave interference state to the access controller (step 5). The access controller determines the radio wave interference state of the path wireless AP 05 by comparing each value indicating the radio wave interference state with each threshold value (step 6). Here, since it is determined that there is no radio wave interference, the access controller transmits a radio wave status request including AP01 which is the APID of the call radio AP01 to the route radio AP05 (step 7). The route wireless AP 05 transmits the radio field intensity of the call wireless AP 01 to the access controller (step 8). The access controller determines the radio wave state of the call radio AP01 by comparing the radio wave intensity of the call radio AP01 with a predetermined threshold (step 9). Here, since it is determined that the radio wave condition is good, the access controller transmits a QoS reservation request including AP01 and the necessary bandwidth to the route wireless AP05 (step 10). Since the route wireless AP 05 is not congested, it reserves a bandwidth for the call wireless AP 01 connected to the terminal 1 (step 11) and returns a QoS reservation response to the access controller (step 12). In FIG. 7, 64 kbps described in parentheses is the bandwidth reserved this time.

  Subsequently, the access controller transmits a radio wave interference state request to the call radio AP 01 (step 13), and the call radio AP 01 transmits information indicating the radio wave interference state to the access controller (step 14). The access controller determines the radio wave interference state of the call radio AP01 by comparing each value indicating the radio wave interference state with each threshold value (step 15). Here, since it is determined that there is no radio wave interference, the access controller transmits a radio wave state request including MS01 which is the MSID of the terminal 1 to the call radio AP01 (step 16). The call radio AP 01 transmits the radio field intensity of the terminal 1 to the access controller (step 17). The access controller determines the radio wave condition of the terminal 1 by comparing the radio wave intensity of the terminal 1 with a predetermined threshold (step 18). Here, since it is determined that the radio wave condition is good, the access controller transmits a QoS reservation request including MS01 and necessary bandwidth to the wireless AP 01 (step 19 in FIG. 8). Since the call wireless AP01 is not congested, it reserves a bandwidth for the terminal 1 (step 20) and returns a QoS reservation response to the access controller (step 21). The access controller returns a QoS reservation response indicating reservation OK to the SIP server (step 22). Thereafter, a sequence based on normal SIP is executed (step 23 to step 27 in FIG. 8).

  In this sequence, the route wireless AP 05 and the call wireless AP 01 manage the bandwidth and reserve / reserve the bandwidth. However, the access controller manages the bandwidth of the wireless AP and controls bandwidth reservation / reservation. It may have a function. In this case, messages relating to bandwidth reservation / reservation / release are not transmitted / received between the wireless AP and the access controller, and bandwidth management such as bandwidth reservation / reservation / release is performed within the access controller.

  The route wireless AP 05 and the call wireless AP 01 monitor the timer. If the next message (steps 32 and 35) is not received within a predetermined time, the bandwidth reserved in steps 11 and 20 is released (steps 28 and 29). ).

  The SIP server that has transmitted and received ACK (steps 26 and 27) manages the call between the terminal 1 and the terminal 2 as a busy call. Further, since the bandwidth between the terminals 1 and 2 is determined at this time, in step 30, the SIP server transmits a QoS ensuring request to the access controller. Thereafter, the route wireless AP 05 and the call wireless AP 01 use the same sequence (steps 31 to 38 in FIG. 8) as the QoS reservation request sequence (steps 3, 10, 11, 12, 19, 20, 21, and 22). Bandwidth is secured and voice communication between the terminals 1 and 2 is executed (step 39).

  FIG. 9 is a sequence diagram showing processing when a call disconnection is performed from the terminal 2 after step 39 in FIG. In steps 40 to 43, the SIP server disconnects the call by performing normal SIP processing. In step 44, the SIP server sends a QoS release request to the access controller. The access controller extracts the corresponding call wireless AP01 and route wireless AP05 (step 45), and transmits a QoS release request to the route wireless AP05 (step 46). The route wireless AP 05 releases the bandwidth reserved for the AP 01 until now (step 47), and returns a QoS release response to the access controller (step 48).

  Further, the access controller transmits a QoS release request to the call wireless AP01 (step 49). The call radio AP01 releases the bandwidth reserved for the MS01 so far (step 50), returns a QoS release response to the access controller (step 51), and the access controller returns a QoS release response to the SIP server (step 52). ).

  10 to 12 are diagrams illustrating a sequence in a case where the terminal 1 transmits to the terminal 2 when all resource states are good. Except for the difference in the SIP sequence caused by the exchange of the transmitting terminal and the receiving terminal, the same processing as in FIGS. 7 to 9 is executed, and bandwidth reservation, bandwidth reservation, and bandwidth release are performed.

  Next, the path wireless AP05 is in radio wave interference, the call radio AP01 is in a low radio wave state, the path radio AP05 is congested, the call radio AP01 is in radio wave interference, the terminal 1 is in a low radio wave state, or the call radio AP01 is congested. In this case, the sequence when the terminal 1 receives an incoming request from the terminal 2 will be described with reference to FIGS.

  FIG. 13 is a diagram illustrating a sequence when the route wireless AP 05 is in radio wave interference. Steps 1 to 5 in FIG. 13 are the same as steps 1 to 5 in FIG. In step 6 of FIG. 13, the access controller that has received the radio interference state notification determines that radio interference has occurred in the path wireless AP 05, and transmits a QoS reservation response indicating that radio interference is occurring to the SIP server. (Step 7). The SIP server transmits busy to the terminal 2 based on the QoS reservation response (step 8).

  FIG. 14 is a diagram showing a sequence when the call radio AP01 is in a low radio wave state. Steps 1 to 8 in FIG. 14 are the same as steps 1 to 8 in FIG. In Step 9 of FIG. 14, the access controller that has received the radio wave state notification determines that the call radio AP01 is in the low radio wave state, and transmits a QoS reservation response indicating that it is in the low radio wave state to the SIP server (Step 10). ). The SIP server transmits busy to the terminal 2 based on the QoS reservation response (step 11).

  FIG. 15 is a diagram illustrating a sequence when the route wireless AP 05 is congested. Steps 1 to 10 in FIG. 15 are the same as steps 1 to 10 in FIG. In step 11 of FIG. 15, the path wireless AP 05 has already allocated almost all the bandwidth that can be allocated, and cannot reserve the necessary bandwidth included in the QoS reservation request. Then, the route wireless AP 05 returns a QoS reservation response indicating that it is congested to the access controller (step 12). The access controller also returns a similar QoS reservation response to the SIP server (step 13), and the SIP server transmits busy to the terminal 2 based on the QoS reservation response (step 14).

  Note that the order of performing the radio wave interference state determination, the radio wave state determination, and the congestion state determination regarding the route wireless AP 05 is not limited to those illustrated in FIGS. 13 to 15 and may be any order. For example, the congestion state determination can be performed first. In this case, after receiving the QoS reservation response indicating that the access controller is congested from the path wireless AP 05, the access controller does not perform the radio wave interference state determination and the radio wave state determination, and sends a QoS reservation response indicating that the congestion is occurring. Send to SIP server. If the access controller receives a normal QoS reservation response from the path wireless AP 05, then it performs radio wave interference state determination and radio wave state determination. If these are OK, the normal QoS reservation response is transmitted to the SIP server. To do. When the access controller receives a normal QoS reservation response from the path wireless AP 05 and any of the subsequent radio wave interference state determination and radio wave state determination is NG, the QoS reservation indicating that to the SIP server A response may be transmitted and a message for releasing the reservation may be transmitted to the route wireless AP 05. Since the timer value is managed, it is not necessary to send a message for releasing the reservation. In addition, when the access controller manages the bandwidth of the path wireless AP 05 and performs the congestion state determination, a normal QoS reservation response is obtained only when all of the radio wave interference state determination, the radio wave state determination, and the congestion state determination are good. Will be sent to the SIP server.

  FIG. 16 is a diagram showing a sequence when the call radio AP01 is in radio wave interference. Steps 1 to 14 in FIG. 16 are the same as steps 1 to 14 in FIG. In step 15 of FIG. 16, the access controller that has received the radio interference state notification determines that radio interference has occurred in the call radio AP01, and transmits a QoS reservation response indicating that radio interference is occurring to the SIP server. (Step 16). The SIP server transmits busy to the terminal 2 based on the QoS reservation response (step 17). Further, the bandwidth of the path wireless AP 05 is released by detecting that the timer value has reached a predetermined value without receiving the next message (step 18).

  FIG. 17 is a diagram illustrating a sequence when the terminal 1 is in a low radio wave state. Steps 1 to 17 in FIG. 17 are the same as steps 1 to 17 in FIG. In step 18 of FIG. 17, the access controller that has received the radio wave state notification determines that the terminal 1 is in the low radio wave state and transmits a QoS reservation response indicating that the terminal 1 is in the low radio wave state to the SIP server (step 19). . The SIP server transmits busy to the terminal 2 based on the QoS reservation response (step 20). In step 21, the bandwidth of the path wireless AP 05 is released.

  18 and 19 are diagrams showing a sequence when the call wireless AP01 is congested. Steps 1 to 19 in FIGS. 18 and 19 are the same as steps 1 to 19 in FIGS. In step 20 of FIG. 19, the call wireless AP 01 has already allocated almost all the bandwidth that can be allocated, and cannot reserve the necessary bandwidth included in the QoS reservation request, and therefore determines that the congestion is in progress. Then, the call wireless AP01 returns a QoS reservation response indicating that it is congested to the access controller (step 21). The access controller also returns a similar QoS reservation response to the SIP server (step 22), and the SIP server transmits busy to the terminal 2 based on the QoS reservation response (step 23). In step 24, the bandwidth of the path wireless AP 05 is released.

  Note that the order in which the radio wave interference state determination, the radio wave state determination, and the congestion state determination regarding the call radio AP01 are performed is not limited to those illustrated in FIGS. For example, the congestion state determination can be performed first. In this case, after receiving the QoS reservation response indicating that the call controller AP01 is congested from the call wireless AP01, the access controller does not perform the radio wave interference state determination and the radio wave state determination, and sends a QoS reservation response indicating that the call is congested. Send to SIP server. In addition, when the access controller receives a normal QoS reservation response from the call wireless AP01, it performs radio wave interference state determination and radio wave state determination. If these are OK, a normal QoS reservation response is transmitted to the SIP server. To do. When the access controller receives a normal QoS reservation response from the call wireless AP01 and any of the subsequent radio wave interference state determination and radio wave state determination is NG, the QoS reservation indicating that to the SIP server A response may be transmitted and a message for releasing the reservation may be transmitted to the wireless AP 01. Since the timer value is managed, it is not necessary to send a message for releasing the reservation. In addition, when the access controller manages the bandwidth of the call wireless AP01 and performs the congestion state determination, a normal QoS reservation response only when the radio wave interference state determination, the radio wave state determination, and the congestion state determination are all good Will be sent to the SIP server.

  Further, the order of the determination of the resource state of the route wireless AP and the determination of the resource state of the call wireless AP may be any order. That is, the resource state of the call wireless AP may be determined first.

  In FIG. 13 to FIG. 19, the SIP server transmits busy to the terminal 2 in the case of radio wave interference or the like, but the SIP server can perform various other call control processes. An example other than the busy transmission is shown in FIG. FIG. 20 shows an example in which a call is transferred to a mobile phone terminal as processing of the SIP server. In this example, the SIP server holds the telephone number of the mobile phone terminal that is the transfer destination for each VoIP terminal (URI). A GW (gateway) shown in FIG. 20 is a device for connecting a mobile phone network and a VoIP network.

  As shown in FIG. 20, as a result of the resource state determination process, the access controller transmits a QoS reservation response indicating any of radio wave interference, low radio wave state, and congestion to the SIP server (step 1). The SIP server that has received the QoS reservation response acquires the telephone number of the mobile phone terminal corresponding to the terminal 1 as the transfer destination (step 2). Then, the SIP server executes a SIP sequence for requesting the terminal 2 to change the connection from the terminal 1 to the mobile phone terminal (steps 3 to 6). Then, connection processing to the mobile phone terminal is performed (steps 7 to 12), and a call is performed between the terminal 2 and the mobile phone terminal (step 13). Note that connection processing between a VoIP terminal and a mobile phone terminal via the GW is a conventional technique.

  When the terminal 1 is a dual terminal having the function of a VoIP terminal and the function of the mobile phone terminal, the owner of the terminal 1 makes a call regardless of the state of the wireless AP by performing the processing shown in FIG. It becomes possible to do. Of course, the mobile phone terminal may be a completely different terminal from the terminal 1. Further, the transfer destination is not limited to the mobile phone terminal, and may be another VoIP terminal, a fixed phone terminal, or the like.

  Although the case where the terminal 1 receives an incoming call has been described in FIGS. 13 to 19, the same processing can be performed when the terminal 1 makes a call. When the terminal 1 transmits, busy is transmitted from the SIP server to the terminal 1.

  The timing for acquiring the radio wave interference state of the wireless AP and the radio wave state of the terminal or the wireless AP is not limited to the timing described in the above embodiment. And the radio wave interference state determination and the radio wave state determination may be performed by acquiring the radio wave interference state information and the radio wave state information from the storage unit.

(Outline of device configuration)
Next, main functions provided in the SIP server, access controller, wireless AP, and console in order to realize the above-described operation will be described. FIG. 21 is a diagram for explaining a functional outline example of the SIP server 40, the access controller 30, the wireless AP 10 (call wireless AP or route wireless AP), and the console 50.

  In addition to the call control function 41 for performing call control based on SIP, the SIP server 40 uses the registration / deletion of the terminal to / from the SIP server (registrar) as a trigger for URI registration (validation). ) / Deletion (invalidation) requests, and SIP messages (INVITE / BYE / response, etc.) are used as triggers to request QoS reservation / reservation / release requests to the access controller 30. An access controller interface function 42 is provided.

  The access controller 30 performs processing corresponding to each request received from the SIP server 40, and transmits an answer (OK / NG) to the SIP server 40. And the radio wave interference information / terminal radio wave state information collecting function 36 for collecting information indicating the radio wave state of the terminal or the wireless AP, the radio wave interference state of the wireless AP, the congestion state of the wireless AP, and the low radio wave state of the terminal or wireless AP A determination function 32 that performs a process, a wireless AP interface function 33 that performs processing corresponding to a terminal registration / deletion request received from a wireless AP, and (a) a pair of a terminal MAC address and a SIP-URI according to input from the console, (B) The console AP that sets the maximum band of the wireless AP, the radio interference state, the threshold for determining the low radio wave state, etc. in the database 35 Interface functions 34, and has a database 35. This example is an example when the access controller 30 manages the bandwidth of each wireless AP.

  In addition to the wireless AP function 11 which is the original function of the wireless AP including the function of the route wireless AP, the wireless AP 10 performs terminal registration / deletion with respect to the access controller 30 triggered by the connection / disconnection of the terminal to / from the wireless AP. An access controller interface function 12 for making a request is provided.

  The console 50 has a user interface function 51 that receives an input from the operator, and an anti-access controller interface function 52 that transmits setting information to the access controller 30.

  The SIP server 40 and the access controller 30 are realized by installing a program for realizing the above functions in a computer having a CPU, a storage device, a communication device, and the like.

  Next, terminal management data, call information management data, call wireless AP management data, route wireless AP management data, and threshold data in the database 35 held by the storage unit of the access controller 30 will be described.

  FIG. 22 shows an example of terminal management data. In the example shown here, the terminal MAC address and the terminal SIP-URI are associated with each other and registered in advance in the database 35 of the access controller 30 as a fixed value. The terminal is managed by recording the wireless state, the call state, and the connected call wireless AP in the database 35 as needed based on the data transmitted and received by the sequence described in FIG.

  The “wireless state” in the data shown in FIG. 22 is data indicating the connection state between the terminal and the call wireless AP. When the terminal and the call wireless AP are in the connected state, “Link Up” is recorded and the disconnection state is entered. In some cases, "Link Down" is recorded. Further, the ID of the calling wireless AP when in the connected state is recorded in the “connected calling wireless AP”.

  “Call state” is data indicating the state of the call, and “Register” is recorded when registered without a call connection, and “Unregister” is recorded when registration is deleted. In addition, when QoS reservation is received until a QoS reservation request is received from the SIP server and the QoS reservation response is returned to the SIP server, "QoS reservation is in progress" is recorded, and the QoS reservation request is returned after returning the QoS reservation response to the SIP server. "QoS reserved" is recorded until QoS is received, and "QoS is being secured" is recorded in the status of securing QoS from when a QoS securing request is received until the QoS securing response is returned to the SIP server. In the state where QoS is secured after the response is returned to the SIP server, “QoS secured” is recorded.

  The “radio wave state” is information indicating the radio wave state of the terminal, and is a value indicating the radio wave intensity of the terminal in the present embodiment. When the radio wave condition is determined by the method described with reference to FIGS. 7 to 19, it is not always necessary to store this value in the database 35, but by holding this value in the database 35, It becomes possible to grasp the radio wave condition for each terminal. In addition, when the radio wave condition is determined by periodically acquiring the radio wave condition information, it is necessary to store a value indicating the radio wave condition in the database 35.

  FIG. 23 shows an example of call information management data. This call information management data indicates that, for example, the call radio AP01 and the call radio AP02 are connected under the route radio AP05. In addition, it is indicated that there is no route wireless AP in the call wireless AP07. FIG. 24 shows another example of call information management data. This example corresponds to the system configuration shown in FIG. 25, and is an example when the route wireless AP has two stages. Of course, there may be three or more route wireless APs.

  FIG. 26 shows an example of call wireless AP management data. The APID and the resource upper limit value are fixed value data registered in advance, and the used resource amount, C.U value, number of retry packets, packet reception distribution value, and packet transmission distribution value are data that is changed as needed.

  “APID” in FIG. 26 is a unique ID for each call wireless AP, and is the same information registered in “connection call wireless AP” of the terminal management data. The “resource upper limit value” is a resource upper limit value that can be used in the call wireless AP. The “resource usage amount” is a bandwidth amount currently used in the call wireless AP, and dynamically changes according to the number of calls of a terminal connected to the call wireless AP. Based on the difference between this information and the “resource upper limit value”, the available bandwidth can be determined, and it can be determined whether or not the call wireless AP is congested.

  Note that the calling wireless AP may hold the resource upper limit value and the resource amount in use. When the call wireless AP holds these data, the call wireless AP performs congestion determination, and the congestion determination result is transmitted to the access controller. On the other hand, since the access controller holds this data, it is not necessary to provide a function such as congestion determination in the call wireless AP.

  The C.U value, the number of retry packets, the packet reception dispersion value, and the packet transmission dispersion value are values indicating the radio wave interference state. When the radio wave interference state determination is performed by the method described with reference to FIGS. 7 to 19, it is not always necessary to store these values in the database 35. It becomes possible to grasp the radio wave interference state for each wireless AP. In addition, when radio wave interference state determination is performed by periodically acquiring radio wave interference state information, it is necessary to hold a value indicating the radio wave interference state in the database 35 as shown in FIG.

  FIG. 27 shows an example of route wireless AP management data. The meaning of each data item is the same as the call wireless AP management data. However, the resource amount in use in FIG. 27 is the total of the resource amounts in use of all the route wireless APs or the call wireless APs under the corresponding route wireless AP. For example, when there are a call wireless AP03 and a call wireless AP04 under the route wireless AP06, and the resource amounts being used by the call wireless AP03 and the call wireless AP04 are 50 kbps and 100 kbps, respectively, the resource amount being used by the route wireless AP06 is 150 kbps. Become.

  FIG. 28 shows an example of threshold data. As shown in FIG. 20, the threshold data includes a threshold for determining whether the terminal or the wireless AP is in a low radio wave state, and a threshold for determining whether the wireless AP is in radio wave interference. Including. Note that the threshold data shown in FIG. 28 may be common to all wireless APs or may be provided for each wireless AP.

(Access controller detailed function configuration)
Next, the detailed functional configuration of the access controller 30 will be described with reference to FIG. The example shown in FIG. 29 is an example when the access controller 30 performs wireless AP resource management such as congestion determination and resource reservation / reservation. In addition, the example shown in FIG. 29 is an example in which the database 35 holds the data shown in FIGS. Further, the resource in the resource reservation or the like below indicates a used band.

  As shown in FIG. 29, the access controller 30 includes a database 35, a SIP cooperation I / F 60, a resource management function 70, a data management function 80, a wireless AP management function 90, a terminal management function 100, and a wireless AP cooperation I / F 110. is doing.

  Hereinafter, the function of each functional unit will be described in more detail.

  The SIP cooperation I / F 60 has a SIP request reception unit 61 and a SIP request return unit 62. The SIP request reception unit 61 includes a terminal registration request reception unit 64 and a resource request reception unit 65. The terminal registration request receiving unit 64 receives a terminal registration request from the registrar. Also, the terminal registration information is passed to the terminal registration unit (application layer) 101. The resource request receiving unit 65 receives a resource request from the SIP server 40 and requests a resource operation from the state determination / resource reservation / release unit 71 according to the resource request type (reservation / reservation / release).

  The SIP request return unit 62 includes a terminal registration request return unit 66 and a resource request return unit 67. The terminal registration request return unit 66 returns the result of the request to the terminal registration request reception unit 64 to the registrar, and requests a resource request. The return unit 67 returns the result of the request to the resource request receiving unit 65 to the SIP server 40. As a result of the request, in addition to indicating that the resource request has been accepted normally, the wireless AP is in radio wave interference, the wireless AP is congested, and the terminal or wireless AP is in a low radio wave state Some of them show abnormal conditions such as.

  The resource management function 70 has a state determination / resource reservation / release unit 71. The state determination / resource reservation / release unit 71 requests a resource operation from the data update unit 81 according to the resource request type (reservation / reservation / release). In addition, congestion is determined according to the amount of free resources. For example, if the value obtained by subtracting the resource amount in use from the upper limit resource amount is equal to or less than the requested resource amount, it is determined that congestion is occurring. Further, the state determination / resource reservation / release unit 71 compares the threshold value stored in the database 35 with the radio wave state information and radio wave interference state information acquired from the wireless AP, thereby determining the radio wave state determination and the radio wave interference state. The determination is performed, and the determination result is notified to the resource request return unit 67.

  The data management function 80 has a data update unit 81. The data update unit 81 reads / adds / updates / deletes data from the database 35. Also, mutual conversion between SIP-URI and terminal MAC address is performed. The wireless AP management function 90 includes a wireless AP / resource registration unit 91 and a wireless AP state registration unit 92. The wireless AP / resource registration unit 91 sets the wireless AP registration and the resource upper limit value for the wireless AP in the database 35 based on an instruction from the console 50. Further, the wireless AP state registration unit 92 stores the radio wave interference state information acquired from the wireless AP and the radio wave state information of the subordinate wireless AP acquired from the wireless AP in the database 35 via the data update unit 81.

  The terminal management function 100 includes a terminal registration unit (application layer) 101, a terminal registration unit (data link layer) 102, and a terminal radio wave state registration unit 103. The terminal registration unit (application layer) 101 receives the SIP-URI of the resource management target terminal from the terminal registration request reception unit 64 and requests the data update unit 81 to perform data registration. With this process, SIP-URI is validated in this system. The terminal registration unit (data link layer) 102 receives the MAC address of the resource management target terminal from the terminal MAC registration request reception unit 111 and requests the data update unit 81 to perform data registration. By this processing, the terminal MAC address is validated in this system. The terminal radio wave state registration unit 103 stores the radio wave state information of the terminal received from the wireless AP in the database 35 via the data update unit 81.

  The wireless AP cooperation I / F 110 includes a terminal MAC registration request reception unit 111, a wireless AP radio wave interference state acquisition unit 112, and a terminal radio wave state acquisition unit 113. The terminal MAC registration request acceptance unit 111 accepts an event triggered by a terminal event (Association / Disassociation / Reassociation) that occurs in the wireless AP, and responds to the terminal registration unit (data link layer) 102 according to the type of the event. Request registration / deletion / re-registration of the terminal MAC address. The wireless AP radio wave interference state acquisition unit 112 transmits a request for wireless AP radio wave interference state information to the wireless AP, and receives the wireless AP radio wave interference state information from the wireless AP. In addition, the wireless AP radio wave interference state acquisition unit 112 transmits a request for radio wave state information of the subordinate wireless AP to the radio AP, and receives the radio wave state information of the subordinate radio AP from the radio AP. The terminal radio wave state acquisition unit 113 transmits a request for radio wave state information of a specific terminal to the wireless AP, and receives the radio wave state information of the terminal from the wireless AP.

  The functional configuration described above is merely an example. Any configuration may be used as long as the operation described in this embodiment can be realized.

  The present invention is not limited to the above-described embodiments, and various modifications and applications are possible within the scope of the claims.

It is a figure which shows the structural example of the conventional radio | wireless IP telephone system. It is a figure which shows an example of the system in embodiment of this invention. It is a figure for demonstrating the operation | movement outline | summary of the system in embodiment of this invention. It is a processing flow of the access controller in the embodiment of the present invention. In embodiment of this invention, it is a sequence diagram for registering the terminal 1 to an access controller. In embodiment of this invention, it is a sequence diagram for deleting the terminal 1 registered from the access controller. FIG. 11 is a sequence diagram (1) when an incoming call request is made to the terminal 1 from the terminal 2 when all resource states are good. FIG. 11 is a sequence diagram (2) when an incoming call request is made to the terminal 1 from the terminal 2 when all resource states are good. FIG. 11 is a sequence diagram (3) when an incoming call request is made from the terminal 2 to the terminal 1 when all resource states are good. It is a sequence diagram (1) when the terminal 1 transmits to the terminal 2 when all resource states are good. It is a sequence diagram (2) when the terminal 1 transmits to the terminal 2 when all resource states are good. It is a sequence diagram (3) when the terminal 1 transmits to the terminal 2 when all resource states are good. FIG. 11 is a sequence diagram when a terminal 1 receives an incoming call request from the terminal 2 when the route wireless AP 05 is in radio wave interference. FIG. 10 is a sequence diagram when a terminal 1 receives an incoming call request from the terminal 2 when the call radio AP01 is in a low radio wave state. FIG. 11 is a sequence diagram when a terminal 1 receives an incoming request from the terminal 2 when the route wireless AP 05 is congested. FIG. 6 is a sequence diagram when a terminal 1 receives an incoming call request from the terminal 2 when the call wireless AP01 is in radio wave interference. FIG. 6 is a sequence diagram in a case where the terminal 1 receives an incoming call request from the terminal 2 when the terminal 1 is in a low radio wave state. FIG. 10 is a sequence diagram (1) when the terminal 1 receives an incoming call request from the terminal 2 when the call wireless AP01 is congested. FIG. 11 is a sequence diagram (2) when the terminal 1 receives an incoming call request from the terminal 2 when the call wireless AP01 is congested. FIG. 11 is a sequence diagram in a case where transfer to a mobile phone terminal is performed in any of a radio wave interference, a low radio wave state, and a congestion. 3 is a diagram illustrating an example of a functional outline of a SIP server 40, an access controller 30, a wireless AP 10, and a console 50. FIG. It is a figure which shows the example of terminal management data. It is a figure which shows Example 1 of call information management data. It is a figure which shows Example 2 of call information management data. FIG. 25 is a diagram showing a system configuration corresponding to the call information management data shown in FIG. 24. It is a figure which shows the example of call radio | wireless AP management data. It is a figure which shows the example of path | route wireless AP management data. It is a figure which shows the example of threshold value data. 3 is a detailed functional configuration diagram of an access controller 30. FIG.

Explanation of symbols

1, 2 Terminal 10 Call wireless AP
20 route wireless AP
11 wireless AP function 12 to access controller interface function 30 access controller 31 to SIP server interface function 32 determination function 33 to wireless AP interface function 34 to console interface function 35 database 36 radio wave interference information / terminal radio wave state information collection function 40 SIP server 41 Call control function 42 Access controller interface function 50 Console 51 User interface function 52 Access controller interface function 60 SIP linkage I / F
70 Resource Management Function 80 Data Management Function 90 Wireless AP Management Function 100 Terminal Management Function 110 Wireless AP Cooperation I / F

Claims (12)

Access in a wireless IP telephone system comprising a call wireless AP connected wirelessly to a terminal, at least one path wireless AP that relays communication between the call wireless AP and another device, and a VoIP call control means A control device,
Receiving means for receiving an inquiry about a resource state related to the terminal from the VoIP call control means that has received a call connection request related to an incoming call from the terminal connected to the call wireless AP or an outgoing call from the terminal;
In response to receiving an inquiry about the resource state related to the terminal, the call wireless AP connected to the terminal and the route wireless AP connected to the call wireless AP are detected, and the call wireless AP Resource state determination means for determining the resource state of the route wireless AP;
Notification means for notifying the VoIP call control means of the determination result by the resource state determination means,
The resource state determination means includes
It is determined whether or not the path wireless AP is in radio interference by acquiring radio wave interference state information indicating the radio wave interference state of the path wireless AP and comparing the radio wave interference state information with a predetermined threshold. A radio interference state information indicating a radio wave interference state of the call radio AP, and comparing the radio wave interference state information with a predetermined threshold value to determine whether the call radio AP is in radio wave interference. Means for determining whether or not,
An access control device comprising: The access control device stores, in a storage unit, table information that holds a call wireless AP and a route wireless AP connected to the call wireless AP in association with each other,
The access control apparatus according to claim 1, wherein the resource state determination unit detects the route wireless AP corresponding to the call wireless AP connected to the terminal with reference to the table information.   The resource state determination unit acquires radio wave state information indicating a radio wave state of the call radio AP, and compares the radio wave state information with a predetermined threshold value to determine whether the call radio AP is in a low radio wave state. Determining whether or not the terminal is in a low radio wave state by acquiring radio wave state information indicating the radio wave state of the terminal and comparing the radio wave state information with a predetermined threshold. The access control apparatus according to claim 1, further comprising a determination unit.   The resource state determination means further includes means for determining whether or not the route wireless AP is congested and means for determining whether or not the call wireless AP is congested. The access control apparatus according to any one of claims 1 to 3.   The notifying unit notifies the VoIP call control unit of a determination result indicating that the resource state is normal when the determination result of all the units included in the resource state determining unit is good. The access control apparatus according to any one of claims 1 to 4.   The notifying unit displays a determination result indicating that the resource state is abnormal when the determination result of at least one of the plurality of determinations that can be executed by the resource state determining unit is not good. The access control device according to claim 1, wherein the access control device is notified to the access control device. A radio having a call radio AP that is wirelessly connected to a terminal, at least one path radio AP that relays communication between the call radio AP and another device, a VoIP call control unit, and an access control device An access control method in an IP telephone system,
A transmission in which the VoIP call control means receives a call connection request related to an incoming call to a terminal connected to the call wireless AP or an outgoing call from the terminal, and transmits an inquiry of a resource state related to the terminal to the access control apparatus Steps,
The access control device detects the call wireless AP connected to the terminal and the route wireless AP connected to the call wireless AP in response to receiving the resource status inquiry about the terminal. A resource state determination step for determining a resource state of the call wireless AP and the route wireless AP;
The access control device, a notification step of notifying the VoIP call control means of the determination result in the resource state determination step;
The VoIP call control means includes a call control step for executing call control according to the determination result received from the access control device;
The resource state determination step executed by the access control device includes:
It is determined whether or not the path wireless AP is in radio interference by acquiring radio wave interference state information indicating the radio wave interference state of the path wireless AP and comparing the radio wave interference state information with a predetermined threshold. And acquiring radio wave interference state information indicating a radio wave interference state of the call radio AP, and comparing the radio wave interference state information with a predetermined threshold value to determine whether the call radio AP is in radio wave interference. And determining whether or not. An access control method comprising:   The access control device stores, in a storage unit, table information that associates and holds a call wireless AP and a route wireless AP connected to the call wireless AP. In the resource state determination step, the access control device 8. The access control method according to claim 7, wherein the path wireless AP corresponding to the call wireless AP connected to the terminal is detected with reference to the table information.   The resource state determination step acquires radio wave state information indicating a radio wave state of the call wireless AP, and compares the radio wave state information with a predetermined threshold value to determine whether the call wireless AP is in a low wave state. Determining whether or not the terminal is in a low radio wave state by acquiring radio wave state information indicating the radio wave state of the terminal and comparing the radio wave state information with a predetermined threshold. The access control method according to claim 7, further comprising a step of determining.   The resource state determination step further includes a step of determining whether or not the route wireless AP is congested and a step of determining whether or not the call wireless AP is congested. The access control method according to any one of claims 7 to 9.   In the notification step, the access control device displays a determination result indicating that the resource state is normal when the determination results of all the determinations executed in the resource state determination step are good. The access control method according to claim 7, wherein the access control method is notified.   In the notification step, the access control device receives a determination result indicating that the resource state is abnormal when the determination result of at least one of the determinations that can be executed in the resource state determination step is not good. 12. The access control method according to claim 7, wherein the VoIP call control means is notified.

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