JP4659582B2 - Access control device - Google Patents

Description

  The present invention relates to a wireless IP telephone system using wireless LAN technology, and more particularly to a wireless IP telephone system that performs congestion control in units of extension groups for each wireless LAN access point.

  FIG. 1 shows a configuration example of a conventional wireless IP telephone system. As shown in FIG. 1, this wireless IP telephone system includes a plurality of wireless LAN access points (hereinafter referred to as wireless APs), a wireless LAN switch that manages a plurality of wireless APs, and a SIP server that performs call control of IP telephones. Including. Further, terminals such as a wireless VoIP terminal exist under the wireless AP and are connected to the wireless AP. In this system, a voice channel is established between terminals by call connection processing based on SIP, and voice communication by RTP is performed.

  The wireless LAN switch has a function for supporting a handover between the terminal and the wireless AP, a function for distributing connections from the terminal to the wireless AP, and the like. It is possible to connect to a wireless AP having a sufficient bandwidth while avoiding the AP (for example, see Non-Patent Document 1).

In addition, by managing the representative number and the terminal belonging to the extension group represented by the representative number in the SIP server, when there is an incoming call for the representative number to a specific department, all the terminals of the department are ringed. It is possible to provide an extension service.
Nikkei Communication, pp. 96 to 103, Nikkei Business Publications, Inc. 2005.7.15

  However, the conventional wireless IP telephone system has the following problems.

  As shown in FIG. 2, it is assumed that the general affairs department and the sales department exist under the wireless AP, and one extension group is formed in each of the general affairs department and the sales department.

  In general, resource allocation to each connected terminal in a wireless AP is a best effort type without guarantee of quality of service (QoS). Further, the wireless AP cannot identify the extension group to which the terminal belongs, and the SIP server cannot grasp the resource state of the wireless AP. Therefore, in FIG. 2, for example, there may occur a case where only a terminal belonging to the general affairs department consumes wireless AP resources. When a terminal belonging to the sales department makes a call connection in such a state, not only can the terminal not perform voice communication with good quality, but also adversely affects the terminal of the general affairs department already connected, The voice quality is deteriorated in all terminals connected to the wireless AP, and noise, missing sound, communication disconnection, etc. occur.

  The present invention has been made in view of the above points, and has as its object to provide a technique for solving the problems of the prior art and performing call control according to the resource state of each extension group in a wireless AP. To do.

The above-described problem is an access control apparatus in a wireless IP telephone system having a wireless AP having a plurality of extension groups and a VoIP call control means, wherein the wireless AP group includes a plurality of wireless APs in the wireless IP telephone system. Extension group resource information in which a plurality of extension groups are formed, and a resource amount for each extension group allocated to the wireless AP group and a resource amount in use for each extension group are associated with each other, and each extension Storage means for recording the group and extension group management information in which upper layer identification information, which is identification information used in call control of each terminal belonging to the extension group, is associated, and a radio from the terminal belonging to the wireless AP group In response to the connection to the AP, the lower level, which is the identification information of the terminal in the data link layer. A lower layer registration means for receiving from the wireless AP a terminal registration request including wireless identification information and wireless AP identification information, and registering the wireless AP identification information in the storage means in association with the lower layer identification information; An upper layer that receives a terminal registration request including upper layer identification information of the terminal and the lower layer identification information from the VoIP call control means, and registers the higher layer identification information in the storage means in association with the lower layer identification information A resource status inquiry is received from the registration means and the VoIP call control means that has received a call connection request related to an incoming call to the terminal or an outgoing call from the terminal, and the upper layer identification information of the terminal included in the inquiry is received. by searching the storage means to detect the wireless AP belonging to the wireless AP group that accommodates the terminal based, the wireless AP Determining means for determining whether the extension group is in a congested state from the allocated resource amount of the extension group to which the terminal belongs and the amount of resources in use by the extension group; and the extension group to which the terminal belongs is congested The access control apparatus has a notification means for notifying the VoIP call control means that the extension group is congested when in the state.

  Further, the present invention provides an access control apparatus in a wireless IP telephone system having a wireless AP having a plurality of extension groups and a VoIP call control means, wherein the resource amount for each extension group assigned to the wireless AP is Corresponding extension group resource information that associates the amount of resources in use for each extension group with upper layer identification information that is identification information used in call control of each terminal belonging to the extension group Terminal registration including extension unit management information, storage means for recording, and lower layer identification information that is identification information of the terminal in the data link layer and wireless AP identification information triggered by connection from the terminal to the wireless AP The storage unit receives a request from the wireless AP and associates the wireless AP identification information with the lower layer identification information. A terminal registration request including lower layer registration means to be registered, upper layer identification information of the terminal and lower layer identification information is received from the VoIP call control means, and the higher layer identification information is associated with lower layer identification information Receiving a resource status inquiry from the upper layer registration means for registering in the storage means and the VoIP call control means for receiving a call connection request related to an incoming call to the terminal or an outgoing call from the terminal, and included in the inquiry The storage means is searched based on higher layer identification information of the terminal to detect the wireless AP accommodating the terminal, and the allocated resource amount of the extension group to which the terminal belongs in the wireless AP, and the extension group used Determining means for determining whether the extension group is in a congested state from the amount of resources in A call connection request having a notification number for notifying the VoIP call control means that the extension group is congested when the extension group to which the extension belongs is in a congested state, with the representative number of the extension group as the destination When the inquiry of the resource status for the plurality of terminals developed based on the representative number is received from the VoIP call control means that has received the message, it is determined whether or not the extension group is in a congestion state, and the congestion state If not, the access control apparatus can be configured to reserve a band for only one line for the extension group.

  According to the present invention, wireless AP identification information and higher layer identification information, which is identification information used in terminal call control, are registered in association with each other based on lower layer identification information, which is terminal identification information in the data link layer. The wireless AP accommodating the target terminal can be detected based on the upper layer identification information used in call control. Further, the extension group resource information in which the resource amount for each extension group allocated to the wireless AP is associated with the resource amount in use for each extension group, and the upper layer identification of each extension group and each terminal belonging to the extension group Since the extension group management information associated with the information is held, it is possible to determine the congestion state of the extension group in the wireless AP to which the terminal belongs using the higher layer identification information used in the call connection. Therefore, it is possible to perform call control according to the resource state of each wireless AP extension group.

  In addition, when a resource amount for each extension group is assigned to a wireless AP group composed of a plurality of wireless APs, the resource amount of each extension group is proportional to the number of terminals connected to the wireless AP for each wireless AP. When it is decided to allocate, resources in each wireless AP can be used efficiently.

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

(System overview)
FIG. 3 shows an example of a system in the embodiment of the present invention. The system shown in FIG. 3 is obtained by adding an access controller 30 to the conventional system shown in FIG. The access controller 30 can be provided in place of the wireless LAN switch in FIG. 3 or in the wireless LAN switch.

  The access controller 30 in the system of FIG. 3 has a function of managing the resource allocation status and usage status for each extension group for each wireless AP. The SIP server 40 has a function of inquiring the resource state from the access controller in response to the occurrence of VoIP communication and performing call control according to the resource state.

  An outline of the operation of the system according to the present embodiment will be described with reference to FIG. As shown in FIG. 4, it is assumed that there are five general affairs department terminals and three sales department terminals under the wireless AP 10. Further, the access controller 30 assigns, to the wireless AP 10, resources for three lines to the extension group of the general affairs department and resources for two lines to the terminals of the sales department. Note that allocating resources for X lines to a certain extension group means that a maximum of X terminals can be simultaneously connected in the extension group.

  Here, it is assumed that three of the five general affairs department terminals under the wireless AP 10 are in call connection. That is, the general affairs department uses all the resources of the assigned wireless AP 10. In addition, it is assumed that the sales department does not make any call connection.

  At this time, when there is an incoming request from the terminal 2 to the terminal 1 that is not connected to the call among the five terminals of the general affairs department (step A), the SIP server 40 sends to the access controller 30 the terminal 1 that is the destination terminal. Queries the resource status of the extension group to which the group belongs (step B). The access controller 30 notifies the SIP server that the extension group to which the terminal 1 belongs in the wireless AP 10 is using all allocated resources and that there is no resource that can be newly used for the extension group to which the terminal 1 belongs ( Step C). The SIP server 40 receives this notification, and transmits busy to the caller terminal 2 as a response to the call connection request in step A (step D).

  At this time, when an incoming call request is made from the terminal 2 to the terminal of the sales department, since unused resources remain in the extension group of the sales department, call connection can be performed normally. As described above, in the present embodiment, it is possible to perform resource control by managing resources for each extension group in the wireless AP. In addition, although busy return was demonstrated as a process of the SIP server 40 with respect to the call connection request | requirement in case all the resources of an extension group are in use, 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. In each sequence diagram, the structure of data held in each device is shown as appropriate, but these are examples. 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 a function similar to that 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. NGID is an extension group ID for identifying the extension group.

  Further, the access controller associates the allocated resource amount for each wireless AP and each extension group, the data in which the MAC address of the terminal and the SIP-URI of the terminal are associated, and the extension group ID and the SIP-URI of the terminal. Assume that data is held in advance.

  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, an authentication process or the like necessary for wireless LAN connection is performed between the terminal 1 and the wireless AP. Here, the wireless AP acquires and registers the MAC address (MSID) of the terminal 1 (step 2). The wireless AP transmits a terminal registration request including the wireless AP ID (AP01) and the MAC address (MS01) of the terminal 1 to the access controller (step 3). The access controller registers the wireless AP ID (AP01) received from the wireless AP 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 wireless AP (step 5). Further, the access controller detects the belonging extension group ID of the terminal 1 from the MAC address of the terminal 1 using the data held in advance, and uses the MAC address of the terminal 1 and the corresponding extension group ID as a terminal registration response. And can be sent to the wireless AP. As a result, the wireless AP can grasp the correspondence between the terminal and the extension group.

  In step 6, the terminal 1 transmits an 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 registered by storing them in the access controller in the sequence. However, only the state change may be recorded. In this case, for example, AP01 is recorded in association with MS01 registered in advance in step 4, and information that URI1 has become valid is recorded in association with AP01, MS01, and URI1 in step 8.

  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, for example, when the terminal 1 is turned off.

  In step 1 of FIG. 6, the terminal 1 transmits a register message including a registration deletion command to the registrar. The registrar transmits a URI deletion request to the access controller (step 2), and the access controller that receives the 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 wireless LAN processing when leaving the wireless AP, and in response to this, the wireless AP deletes the MSID (step 7) and transmits a terminal deletion request to the access controller (step). 8) Upon receiving this, the access controller deletes AP01 and MS01 from the database (step 9), and returns a terminal deletion response to the wireless AP (step 10).

  Next, with reference to FIG. 7 to FIG. 9, an operation when an incoming request is made from the terminal 2 to the terminal 1 under the wireless AP will be described.

  As shown in the upper side of FIG. 7, the premise of the operation here is that three terminals are in the call connection state in the extension group whose extension group ID is NG01, and 192 kbps of the allocated resource 320 kbps is consumed. To do. The wireless AP stores data indicating this state. In the sequence diagram, the wireless AP manages the data and the wireless AP performs congestion determination. However, the access controller may hold data corresponding to the data, and the access controller may perform congestion determination.

  The source terminal 2 transmits a call connection request (INVITE) for the terminal 1 to the SIP server (step 1). The SIP server that has received INVITE transmits a QoS reservation request including the source terminal URI (URI2), destination terminal URI (URI1), and necessary bandwidth to the access controller (step 2). The access controller searches the database based on the destination URI 1 and extracts the wireless AP having the terminal 1 under control (step 3). Then, a QoS reservation request including MS01 and necessary bandwidth is transmitted to the wireless AP (step 4).

  The wireless AP that has received the QoS reservation request determines whether or not the terminal 1 can use the call connection resource in the extension group (NG01) to which the terminal 1 belongs. Here, since the allocation resource of NG01 is 320 kbps and the consumption resource is 192 kbps, there is a margin of 64 kbps or more necessary for the call connection of the terminal 1. Accordingly, the wireless AP reserves a bandwidth for the terminal 1, updates the consumed resource (step 5), returns a QoS reservation response to the access controller (step 6), and the access controller returns a QoS reservation response to the SIP server (step 6). Step 7). Thereafter, a sequence based on normal SIP is executed (steps 8 to 12 in FIG. 8).

  As described above, in this example, the wireless AP manages the bandwidth for each extension group and reserves / reserves the bandwidth. However, the access controller has a function for performing bandwidth management / reservation / reservation for each extension group. You may have it. 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 wireless AP is monitoring the timer, and if the next message (step 16) is not received within a predetermined time, the bandwidth reserved in step 5 is released (step 13 in FIG. 8).

  The SIP server that has transmitted and received ACK (steps 11 and 12 in FIG. 8) manages a call between the terminal 1 and the terminal 2 as a busy call. Since the bandwidth between the terminals 1 and 2 is determined at this time, the SIP server transmits a QoS reservation request to the access controller in step 14 of FIG. Thereafter, the bandwidth is secured in the wireless AP by the same sequence (step 15 to step 19 in FIG. 8) as the QoS reservation request sequence (step 3 to step 7 in FIG. 7), and voice communication between the terminals 1 and 2 is performed. Is executed (step 20).

  FIG. 9 is a sequence diagram showing processing when a call is disconnected from the terminal 2 after step 20 of FIG. In step 21 to step 24, normal SIP processing is performed, so that the SIP server disconnects the call. In step 25, the SIP server sends a QoS release request to the access controller. The access controller extracts the corresponding wireless AP (step 26) and transmits a QoS release request to the wireless AP (step 27). The wireless AP releases the bandwidth reserved for the MS01 so far, updates the consumption resources in the extension group to which the terminal 1 belongs (step 28), returns a QoS release response to the access controller (step 29), and accesses The controller returns a QoS release response to the SIP server (step 30).

  In the above case, even when the terminal 1 under the wireless AP makes a call to the terminal 2, the same processing as that shown in FIGS. 7 to 9 is executed except for the difference in the SIP sequence caused by the exchange of the transmitting terminal and the receiving terminal. Then, bandwidth reservation, bandwidth reservation, and bandwidth release are performed.

  The example shown in FIGS. 7 to 9 is a case where there is a margin in the resources of the extension group to which the terminal 1 belongs. For example, at the stage of determination in step 5 of FIG. 7, consumption from the allocated resources of the extension group 1 (NG01). If the value obtained by subtracting the resource is smaller than the value necessary for the call connection of the terminal 1, QoS reservation is impossible, and processing corresponding to that is performed. Hereinafter, an operation example in this case will be described. It is assumed that the extension group is “congested” when the value obtained by subtracting the consumed resource from the allocated resource in a certain extension group is smaller than the value necessary for the call connection of the terminal 1.

  First, an operation example 1 will be described with reference to FIG.

  Steps 1 to 4 in FIG. 10 are the same as steps 1 to 4 in FIG. In step 5 after the wireless AP receives the QoS reservation request from the access controller, the wireless AP determines that the extension group 1 (NG01) is congested and cannot reserve the necessary bandwidth included in the QoS reservation request. To do. Then, the wireless AP returns a QoS reservation response indicating that it is congested to the access controller (step 6). The access controller also returns a similar QoS reservation response to the SIP server (step 7), and the SIP server determines that the wireless AP is congested based on this QoS reservation response, and transmits busy to the terminal 2 (step 8).

  Next, an operation example 2 will be described with reference to FIGS. The operation example 1 described in FIG. 10 is an example in which the SIP server returns busy to the calling terminal, while the operation example 2 is an example in which the SIP server transfers a call. In this case, it is assumed that a transfer destination table in which a transfer destination terminal corresponding to the terminal is recorded for each terminal in the SIP server. Further, it is assumed that the terminal 3 (URI 3) as the transfer destination is a VoIP terminal connected to the network by wire.

  Steps 1 to 7 in FIG. 11 are the same as steps 1 to 7 in FIG. When the SIP server receives a QoS reservation response indicating that congestion is occurring, in step 8, the SIP server refers to the transfer destination table and obtains the transfer destination URI 3 corresponding to the terminal 1 (URI 1) that is the destination. Then, the SIP server transmits a QoS reservation request designating the destination URI 3 to the access controller (step 9). The access controller searches for a wireless AP having the terminal 3 of URI3 (step 10), but such a wireless AP does not exist in the database, and a QoS reservation response indicating that fact is returned to the SIP server (step 11). Thereafter, the SIP server performs call connection processing for normal transfer (steps 12 to 16 in FIG. 12), and voice communication is performed between the terminal 3 and the terminal 2 (step 17). When the call is disconnected in steps 18 to 21, the SIP server transmits a QoS release request to the access controller in step 22 (step 22), but the corresponding wireless AP is not found in the access controller (step 23). A QoS release response is transmitted to the SIP server (step 24).

  Next, an operation example 3 will be described with reference to FIG. In the operation example 3, a media server is provided, and after the SIP server receives a QoS reservation message indicating that congestion is present in step 7, the media server and the terminal 2 are connected (steps 8 to 12). After a guidance such as “Cannot connect because of congestion” is sent to the terminal 2 (step 13), the call is disconnected (steps 14 to 17).

  Next, an operation example 4 will be described with reference to FIGS. In the operation example 4, the terminal 1 is in a state in which it cannot be connected due to the extension AP congestion of the wireless AP, and a guidance is sent to the terminal 2 notifying that the terminal 1 waits until communication becomes possible. When the terminal 1 can be communicated after the cancellation, the terminal 1 and the terminal 2 are connected.

  In step 7, when the SIP server receives a QoS reservation response indicating congestion, the SIP server sends a QoS reservation + notification request including the outgoing / incoming URI, required bandwidth, and CallID to the access controller (step 8). The QoS reservation + notification request is a message for notifying the wireless AP of the bandwidth for which the QoS reservation is to be made and requesting the notification when there is enough space to secure the bandwidth.

  In step 9, the access controller transmits a QoS reservation + notification request to the corresponding wireless AP. The wireless AP that has received the QoS reservation + notification request recognizes that the band reservation has been made to the MS01, starts monitoring the band (step 10), and returns a response to the QoS reservation + notification request (step 11). 12).

  On the other hand, the originating terminal 2 and the media server are connected by a predetermined procedure using SIP (step a to step f), and guidance is sent to the terminal 2 (step 13).

  In FIG. 15, the wireless AP checks the available bandwidth of the extension group 1 (step 14), and sends a QoS availability notification, which is a message for notifying that there is a bandwidth above the requested bandwidth, to the access controller. (Step 15). This notification includes a CallID for identifying the call. The access controller transmits a QoS availability notification to the SIP server (step 16), and a QoS availability response is returned from the SIP server (steps 17 and 19).

  Next, the session between the terminal 2 and the media server is terminated by a predetermined SIP procedure (step 20), and connection processing from the terminal 2 to the terminal 1 is started (step 21). The subsequent processing (step 22 to step 39 in FIG. 16) is the same as the processing in step 2 in FIG. 7 to step 20 in FIG.

  Next, with reference to FIG. 17 to FIG. 19, a connection operation when performing an extension group simultaneous call as another operation example will be described. In this example, the SIP server holds an extension group table in which a representative number is associated with a set of child numbers. It is also assumed that terminals URI1, URI2, and URI3 of extension group 1 with URI0 as the representative number exist under the wireless AP.

  In FIG. 17, when the SIP server receives an INVITE including the representative number (URI0) as a call destination from the terminal 4 (step 1), the SIP server refers to the extension group table and refers to the child numbers (URI1, URI2,. URI 3) is extracted, and a QoS reservation request is sent to the access controller, each of which is a destination (steps 2 to 4). The access controller extracts the corresponding wireless AP for each destination (step 5), and sends a QoS reservation request including the MSID, required bandwidth, and CallID to the wireless AP. In this example, all destinations are the same. Since it is under the control of the wireless AP, all QoS reservation requests are transmitted to one wireless AP (steps 6 to 8). CallID is the same for all destinations.

  A plurality of terminals belonging to the representative are called by calling with the representative number, but only one terminal is connected to the caller. Accordingly, in step 9, the wireless AP reserves a band for one line in association with the CallID. In other words, the available bandwidth in the extension group 1 is checked here, and it is confirmed that the bandwidth can be reserved, and the bandwidth is reserved.

  Thereafter, a response to each of Steps 6 to 8 (Step 10) and a response to each of Steps 2 to 4 are returned (Step 11).

  Thereafter, the SIP server transmits INVITE to each terminal belonging to the extension group and rings each terminal (steps 12 to 14 in FIG. 18). In the example of FIG. 18, the terminal 3 responds and the terminal 3 and the terminal 4 are connected (step 15 to step 18). After that, the bandwidth securing process in the wireless AP for the terminal 3 is performed in the same sequence as Step 13 to Step 19 in FIG. 8 (Step 19 to Step 25).

  On the other hand, as shown in FIG. 19, message transmission / reception for canceling INVITE is performed in the terminal 1 (steps 26 to 29). Then, a QoS release request for the terminal 1 is sent from the SIP server to the access controller (step 30), and is sent from the access controller to the wireless AP (step 31). The wireless AP deletes the entry of the terminal 1 (step 32), and a response to the request is returned (steps 33 and 34). The same processing as that of the terminal 1 is performed on the terminal 2 (steps 35 to 43).

(Outline of device configuration)
Next, main functions provided in the SIP server, the access controller, the wireless AP, and the console in order to realize the above-described operation will be described. FIG. 20 is a diagram for explaining an example of functional outline of the SIP server 40, the access controller 30, the wireless AP 10, and the console 50. Here, an example in which the access controller manages the bandwidth of each wireless AP and performs congestion determination will be described.

  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 triggering SIP messages (INVITE / BYE / responses, etc.) as a trigger, and making a QoS reservation / reservation / release request 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. A determination function 32 for determining congestion based on resources and consumed resources, an anti-wireless AP interface function 33 for performing processing corresponding to a terminal registration / deletion request received from a wireless AP, and (a) a terminal MAC according to input from a console Address and SIP-URI pair, (b) maximum resource amount of wireless AP, (c) extension group registered terminal information in which extension group ID and SIP-URI of terminal belonging to extension group are associated, (d) wireless Extension group ID for each AP and allocated resource for each extension group ID Extension group setting resource information such pairs console interface function 34 to be set to the database 35 which associates, and has a database 35. In addition, when allocating resources to a plurality of extension groups in units of a wireless AP group including a plurality of wireless APs, the access controller 30 stores calculation means for calculating resource allocation to each wireless AP and calculation results in a database. Means to do this may be provided.

  Further, in addition to the wireless AP function 11 inherent to the wireless AP, the wireless AP 10 has an anti-access controller interface function 12 that makes a terminal registration / deletion request to the access controller 30 triggered by connection / disconnection of the terminal to / from the wireless AP. Have.

  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.

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

  Next, terminal management data, wireless AP management data, extension group registration terminal data, and extension group setting resource data in the database 35 held by the access controller 30 in this embodiment will be described.

  FIG. 21 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. Then, the terminal is managed by recording the wireless state, SIP state, CallID, and connected AP as needed based on the data transmitted and received by the sequence described in FIG.

  The “wireless state” in the data shown in FIG. 21 is data indicating the connection state between the terminal and the wireless AP. When the terminal and the wireless AP are in the connected state, “Link Up” is recorded, and when the terminal is in the disconnected state “Link Down” is recorded. In addition, the ID of the wireless AP when in the connected state is recorded in “connected AP”.

  “SIP status” is data indicating the connection status between the terminal and the SIP server, “Register” is recorded when registered without call connection, “Unregister” is recorded when registration is deleted, In the state of QoS reservation from the start of call connection processing to call connection, “QoS reservation” is recorded, and in the state of QoS reservation from call connection to call disconnection, “QoS reservation” is recorded.

  “Call ID” records data only when the “SIP status” is QoS reservation / QoS reservation, and sets the Call ID for each call (SIP session). This CallID is used for specifying a call of QoS empty Notify ().

  FIG. 22 shows an example of wireless AP management data. “APID” in FIG. 22 is a unique ID for each wireless AP, and is the same information registered in “connected AP” of the terminal management data. The “resource upper limit value” is a resource upper limit value that can be used by the wireless AP. These data are registered in advance as fixed values. These data can be used when calculating the resource allocation.

  FIG. 23 shows an example of extension group registration terminal data. “Extension group ID” in FIG. 23 is a unique ID for each extension group, and the extension group belonging SIP-URI is a SIP-URI of a terminal belonging to the extension group. These data are registered in advance as fixed values.

  FIG. 24 shows an example of extension group setting resource data. Among the data shown in FIG. 24, “extension group ID”, “allocated resource”, and “set AP” are data registered in advance as fixed values. However, the “allocated resource” can also be set dynamically when performing resource proportional allocation, which will be described later.

  The “extension group ID” is the same as the “extension group ID” of the extension group registration terminal data. “Allocated resource” is a resource upper limit value that can be used in the extension group. “Setting AP” is identification information of the wireless AP for which resource setting is made for the extension group, and is the same identification information as information registered in “connection AP” of the terminal management data.

  The “in-use resource amount” is a value indicating the amount of resources currently used in the extension group of the wireless AP indicated by the set AP, and is operated according to the number of calls of terminals belonging to the extension group under the wireless AP. It is a value that changes automatically. This value is added when a terminal call connection occurs, and is subtracted when the call connection ends. Whether or not the extension group in the wireless AP is congested can be determined from the value obtained by subtracting the “in-use resource amount” from the “allocated resource”.

  The access controller 30 according to the present embodiment can perform congestion determination by the following procedure using the above data.

  When the access controller 30 accepts the QoS reservation request (or QoS reservation request), the terminal management data is searched using the URI included in the QoS reservation request to extract the connected wireless AP. Then, the extension group registration terminal data is searched, the assigned extension group ID is extracted, and the assigned resource amount and the used resource amount are determined by searching the extension group setting resource data using the connected wireless AP and the assigned extension group ID. get. Then, the amount of unused resources is calculated from these, and compared with the necessary bandwidth included in the QoS reservation request, if there is an unused resource that can use the necessary bandwidth, bandwidth reservation is performed. If insufficient, it is determined that congestion is occurring.

(Access controller detailed function configuration)
Next, the detailed functional configuration of the access controller 30 will be described with reference to FIG. As shown in FIG. 25, the access controller 30 has 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. ing.

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

  The SIP cooperation I / F 60 includes a SIP request reception unit 61, a SIP request return unit 62, and a SIP notification unit 63.

  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 resource reservation / release unit 71 according to the resource request type (reservation / reservation + notification / reservation / release). When the resource request type is “reservation + notification”, the resource status change monitoring unit 72 is requested to monitor resources.

  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 request result to the resource request receiving unit 65 to the SIP server 40.

  The SIP notification unit 68 includes a resource state change notification unit 68, and the resource state change notification unit 68 sends a QoS empty Notify () notification to the SIP server 40 in response to a request from the resource state change monitoring unit 72. Do.

  The resource management function 70 includes a resource reservation / release unit 71 and a resource state change monitoring unit 72. The resource reservation / release unit 71 requests a resource operation from the data update unit 81 according to the resource request type (reservation / reservation / release). The extension group management unit 711 in the reservation / release unit 71 determines congestion according to the amount of free resources in the extension group. For example, when the value obtained by subtracting the resource amount in use from the upper limit resource amount of a certain extension group in a certain wireless AP is equal to or less than the resource amount requested in relation to the terminal of the extension group in the corresponding wireless AP, the congestion is occurring. Judge that there is. The resource state change monitoring unit 72 monitors a free resource for each extension group of the wireless AP, and notifies the resource state change notification unit 68 of a free state when transitioning to a free state.

  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. Further, mutual conversion between the SIP-URI and the terminal MAC address is performed. The extension group update unit 811 in the data update unit 81 reads / adds / deletes data to / from the database 35 of extension group related information.

  The wireless AP management function 90 has a wireless AP / resource registration unit 91. 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. The extension group registration unit 911 in the wireless AP / resource registration unit 91 sets information related to the extension group.

  The terminal management function 100 includes a terminal registration unit (application layer) 101 and a terminal registration unit (data link layer) 102. 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, the SIP-URI is validated in this system. In addition, 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 wireless AP cooperation I / F 110 has a terminal MAC registration request receiving unit 111. The terminal MAC registration request accepting unit 111 accepts an event triggered by a terminal event (Association / Dissociation / Reassociation) that occurs in the wireless AP, and the terminal registration unit (data link layer) 102 receives the event according to the type of the event. Request registration / deletion / re-registration of the terminal MAC address.

(About radio resource allocation method for extension groups)
So far, an example has been described in which resources for a plurality of extension groups are assigned to each wireless AP. For example, as shown in FIG. 26, resources assigned to extension groups (general affairs, sales, etc.) can be fixedly assigned to each wireless AP (AP11, AP12, etc.). In the description so far, assuming that the use band value is different for each user terminal, the resource of the wireless AP has been described with the band value (for example, FIG. 22). Assuming that the bandwidth values to be used are all equal, the amount of resources is represented by the number of connectable lines. Hereinafter, a group composed of a plurality of wireless APs is referred to as a wireless AP group.

  FIG. 26 shows an example in which the wireless AP 15 and the wireless AP 16 constitute a wireless AP group X, and the wireless AP 21, the wireless AP 22, and the wireless AP 23 constitute a wireless AP group Y. For the wireless AP 15, there are three lines for the general affairs department extension group (hereinafter referred to as “general affairs department”), three lines for the sales department extension group (hereinafter referred to as “sales department”), and for the wireless AP 16. This is an example in which the resources of the wireless AP are fixedly allocated to both extension groups of the general affairs department and the sales department, such as three lines for the general affairs department and one line for the sales department. In the wireless AP group Y, resources as shown in FIG. 26 are allocated to each wireless AP.

  As shown in FIG. 26, when the resource allocation to each extension group is fixed for each wireless AP, if the number of extension groups and the number of wireless APs are large, do not allocate more than the allocable amount. The management operation of the allocation which needs to be managed becomes large.

  In view of the above points, for example, resources may be allocated to a plurality of extension groups in units of groups including a plurality of wireless APs such as one floor and one building. For example, for one floor including five wireless APs, resource allocation is performed so that 15 lines and 10 lines are allocated to the general affairs department and the sales department that exist on the one floor, respectively.

  When assigning resources to a plurality of extension groups in units of wireless AP groups, resource allocation for each extension group for each wireless AP in the wireless AP group is as follows: (1) Resources of each wireless AP at a fixed rate in units of wireless groups (This is called “Fixed Proportional Distribution”), (2) Assign resources (number of lines) to each extension group for each wireless group, and exist in the service area of the wireless AP A method of allocating resources to each extension group in the wireless AP according to the number of terminals to be performed (this is referred to as “connected terminal proportional distribution”) will be described.

  In this way, a plurality of wireless APs (for example, the same floor of a building) are set as one wireless group, resource allocation to the extension group is determined for the wireless group, and the extension group in each wireless AP is determined by calculation processing. Management of resource allocation becomes easy.

  Further, it is not necessary to assign all resources to the extension group, and a certain resource can be prepared for a terminal that does not belong to the extension group or a terminal in the extension group in which all the allocated resources are used.

[(1) About fixed proportional allocation]
In the fixed proportional distribution, the resource of the extension group in each wireless AP is allocated at the same ratio as the ratio of the allocation resource of the extension group set in the wireless AP group. For example, as shown in FIG. 27, in the 1-floor wireless AP group X in which the general affairs department and the sales department exist, the resources that can be reserved by the general affairs department and the sales department at a ratio of 3: 2 and the wireless AP group Z on the other floor. Similarly, it is assumed that wireless AP resources are allocated to the general affairs department and the sales department at a ratio of 1: 9. In this case, resources in each wireless AP in the wireless AP group are allocated at a ratio of general affairs department: sales department = 3: 2. For example, if there are two wireless APs belonging to the wireless AP group X and the upper limit resource amount is 10 lines for the wireless AP 15 and 5 lines for the wireless AP 16, respectively, the 10 lines of the wireless AP 15 are connected to the general affairs department and the sales department. Then, it is divided into 3: 2, and the fifth round of the wireless AP 16 is divided into 3: 2 between the general affairs department and the sales department. That is, as shown in FIG. 27, a line is assigned to each wireless AP.

  A fraction may occur when resources are proportionally distributed in units of the number of lines (even if the number of bands is used as a unit, the same applies when allocation is performed in the minimum unit of the resource amount used by the terminal). For example, if 15 lines are assigned to the general affairs department and the sales department at a ratio of 1: 9 in the AP 22 of FIG. 27, the numbers are 1.5 and 13.5. This can be solved by setting rules in advance. In the example of FIG. 27, the number of lines calculated for an extension group (general affairs department) with a small number of lines is rounded up, and the remaining resources are allocated to another extension group (sales department). In addition, one line may be allocated to the extension group whose resource amount is less than one line, and the remaining resources may be proportionally distributed among other extension groups, or when there are many extension groups having less than one line. A plurality of extension groups may be assigned to a group of extension groups to allocate wireless AP resources.

  Further, when the upper limit resource amount in each wireless AP is the same, the allocation resource of each extension group set in the wireless AP group may be equally allocated to each wireless AP. In this case, for example, if the upper limit resource amount of each wireless AP is 5 lines, 3 lines are assigned to the general affairs department and 2 lines are assigned to the sales department in each wireless AP.

  This allocation content may be registered on the extension group setting resource data of the access controller 30 from the console by performing the above calculation on another computer, or the allocation within the wireless AP group (six lines for the general affairs department, sales Only four lines or the like may be input to the access controller 30, and the access controller 30 may perform the proportional calculation and register the calculation result in the extension group setting resource data.

[(2) Connection terminal proportional distribution]
In the connected terminal proportional distribution, the allocation resource of the extension group set in the wireless AP group is proportionally distributed to each wireless AP by the number of terminals connected to the wireless AP. The terminal connected to the wireless AP is a terminal in the “Link up” state in the terminal management data shown in FIG.

  For example, as shown in FIG. 28, when the allocation resource to the general affairs department in the wireless AP group X is 6 lines, there are 10 terminals in the general affairs department under the wireless AP 15 of the two wireless APs belonging to the wireless AP group. Assume that five terminals of the general affairs department are connected under the wireless AP 16. In this case, the 6 resources allocated to the general affairs department are distributed between the wireless AP 15 and the wireless AP 16 at a ratio of 10: 5, that is, 2: 1. That is, 6 × 10 / (10 + 5) = 4 lines are assigned to the general affairs department for the wireless AP 15, and the remaining two lines are assigned to the wireless AP 16.

  This allocation process can be performed as follows.

  The resource allocation contents in the wireless AP group are input to the access controller 30. The access controller 30 periodically monitors terminal management data, and acquires the number of connected terminals for each extension group for each wireless AP. Then, using the acquired data, the allocation resource for each extension group for each wireless AP is calculated by the above method, and the calculation result is set in the extension group setting resource data. If many terminals are concentrated under one wireless AP and the total allocated resources of each extension group obtained by the above calculation method exceeds the upper limit resource of the wireless AP, the total allocated resources is In order not to exceed the upper limit resource, for example, the allocation resource is compressed by multiplying the allocation resource of each extension group by (the upper limit resource of wireless AP / the total of allocation resources obtained by calculation). Then, the resources reduced by the compression are allocated to other wireless APs.

  In the proportional distribution of connected terminals, a large number of resources are allocated to a wireless AP with a large number of connected terminals, so that it is considered that there is a low possibility that a connection will be rejected due to insufficient resources.

  In the above-described proportional distribution of connected terminals, in addition to performing resource allocation calculation according to the number of terminals connected to the wireless AP at the present time, for example, the resource is calculated using the average number of terminals connected to the wireless AP in a predetermined period. It is also possible to perform an allocation calculation.

  The present invention is not limited to the above-described embodiment, and various modifications and applications can be made 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 for demonstrating the problem of a prior art. 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 sequence diagram for registering the terminal 1 in the access controller. It is a sequence diagram for deleting the terminal 1 registered from the access controller. FIG. 10 is a sequence diagram when an incoming request is made from a terminal 2 to a terminal 1 under a wireless AP that is not congested. FIG. 10 is a sequence diagram when an incoming request is made from a terminal 2 to a terminal 1 under a wireless AP that is not congested. FIG. 10 is a sequence diagram when an incoming request is made from a terminal 2 to a terminal 1 under a wireless AP that is not congested. It is a sequence diagram which shows the operation example 1 when the terminal 1 which is under the wireless AP under the extension group congestion has an incoming request from the terminal 2. It is a sequence diagram which shows the operation example 2 when there exists an incoming call request | requirement from the terminal 2 to the terminal 1 under the wireless AP under extension group congestion. It is a sequence diagram which shows the operation example 2 when there exists an incoming call request | requirement from the terminal 2 to the terminal 1 under the wireless AP under extension group congestion. FIG. 10 is a sequence diagram showing an operation example 3 when a terminal 1 receives an incoming request from a terminal 1 under a congested wireless AP. It is a sequence diagram which shows the operation example 4 when the terminal 1 which is under control of the wireless AP in congestion receives an incoming request from the terminal 2. It is a sequence diagram which shows the operation example 4 when the terminal 1 which is under control of the wireless AP in congestion receives an incoming request from the terminal 2. It is a sequence diagram which shows the operation example 4 when the terminal 1 which is under control of the wireless AP in congestion receives an incoming request from the terminal 2. It is a sequence diagram which shows the connection operation | movement in the case of performing an extension group simultaneous call. It is a sequence diagram which shows the connection operation | movement in the case of performing an extension group simultaneous call. It is a sequence diagram which shows the connection operation | movement in the case of performing an extension group simultaneous call. It is a figure for demonstrating the function outline | summary of an apparatus. It is a figure which shows the example of terminal management data. It is a figure which shows the example of wireless AP management data. It is a figure which shows the example of an extension group registration terminal data. It is a figure which shows the example of an extension group setting resource data. 3 is a detailed functional configuration diagram of an access controller 30. FIG. It is a figure for demonstrating the example in the case of allocating resources to each wireless AP. It is a figure for demonstrating the fixed proportional allocation of a resource. It is a figure for demonstrating the connection terminal proportional distribution of a resource.

Explanation of symbols

1, 2 Terminal 10 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 40 SIP server 41 call control function 42 to access controller interface function 50 console 51 User Interface Function 52 vs. Access Controller Interface Function 60 SIP Cooperation 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 (2)

An access control apparatus in a wireless IP telephone system having a wireless AP having a plurality of extension groups and a VoIP call control means,
In the wireless IP telephone system, a plurality of extension groups are formed under a wireless AP group composed of a plurality of wireless APs,
Extension group resource information that associates the resource amount for each extension group assigned to the wireless AP group with the resource amount in use for each extension group, and call control of each extension group and each terminal belonging to the extension group Storage means for recording extension group management information associated with higher layer identification information which is identification information used;
Upon receiving a connection from a terminal to a wireless AP belonging to the wireless AP group, a terminal registration request including lower layer identification information that is identification information of the terminal in the data link layer and wireless AP identification information is received from the wireless AP. A lower layer registration unit that registers the wireless AP identification information in the storage unit in association with the lower layer identification information;
A terminal registration request including the upper layer identification information of the terminal and the lower layer identification information is received from the VoIP call control means, and the upper layer identification information is registered in the storage means in association with the lower layer identification information. Layer registration means;
The storage unit receives an inquiry about a resource state from the VoIP call control unit that has received a call connection request related to an incoming call to the terminal or an outgoing call from the terminal, and the storage unit is based on upper layer identification information of the terminal included in the inquiry The wireless AP belonging to the wireless AP group accommodating the terminal is detected, and the extension is determined from the allocated resource amount of the extension group to which the terminal belongs in the wireless AP and the resource amount in use in the extension group. Determining means for determining whether the group is in a congested state;
An access control apparatus comprising: a notification unit configured to notify the VoIP call control unit that the extension group is congested when the extension group to which the terminal belongs is in a congested state. An access control apparatus in a wireless IP telephone system having a wireless AP having a plurality of extension groups and a VoIP call control means,
Extension group resource information that associates the resource amount for each extension group allocated to the wireless AP with the resource amount in use for each extension group, and is used for call control of each extension group and each terminal belonging to the extension group Storage means for recording extension group management information associated with higher layer identification information which is identification information to be recorded,
In response to the connection from the terminal to the wireless AP, a terminal registration request including lower layer identification information and wireless AP identification information that is identification information of the terminal in the data link layer is received from the wireless AP, and the wireless AP identification Lower layer registration means for registering information in the storage means in association with the lower layer identification information;
A terminal registration request including the upper layer identification information of the terminal and the lower layer identification information is received from the VoIP call control means, and the upper layer identification information is registered in the storage means in association with the lower layer identification information. Layer registration means;
The storage unit receives an inquiry about a resource state from the VoIP call control unit that has received a call connection request related to an incoming call to the terminal or an outgoing call from the terminal, and the storage unit is based on upper layer identification information of the terminal included in the inquiry The wireless AP that accommodates the terminal is detected, and the extension group is brought into a congestion state from the allocated resource amount of the extension group to which the terminal belongs in the wireless AP and the resource amount in use in the extension group. Determination means for determining whether or not there is;
Have a notification means for notifying that said extension group when the extension group to which the terminal belongs in a congestion state is congested to the VoIP call control means,
When an inquiry about a resource state for a plurality of terminals developed based on the representative number is received from the VoIP call control means that has received a call connection request with a representative number of a certain extension group as a destination, the extension group An access control device that determines whether or not a network is in a congestion state and reserves a bandwidth for only one line for the extension group when the state is not in a congestion state .

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