JP2009159087A - Access control device - Google Patents

Abstract

To provide an access control apparatus that allows a communication terminal to flexibly change a resource to be set in order to ensure an optimum communication speed by setting resource request values in stages.
Upon receiving a QoS policy, a first resource request value is determined. If communication cannot be performed with the first resource request value, a second resource request value lower than the first resource request value is determined. Then, when retry determination is executed after transmitting data with the second resource request value, it is determined whether communication is possible with the first resource request value. If communication is possible using the first resource request value, communication is performed using the first resource request value.
[Selection] Figure 3

Description

  The present invention relates to an access control apparatus.

  Conventionally, in a wired access network such as ADSL, QoS control such as monitoring the load status such as the traffic volume in a router that transfers IP packets and allocating more bandwidth to the router in the load status has been performed. Is common. Even in a mobile communication network such as IMT-2000, for such QoS control, a method of securing necessary communication resources and providing appropriate service quality to a communication terminal is taken (for example, see Non-Patent Document 1).

  For example, when a user transmits / receives a large amount of data such as high-quality moving image distribution, a method is known in which resources of a transport portion including a wireless section are ensured in a wide band and distributed.

  Recently, QoS control using an IP multimedia core network control subsystem (IMS) has been implemented. Note that the IP multimedia core network control subsystem (IMS) is a subsystem that is activated when a real-time multimedia service such as a videophone or interactive group communication is performed.

  Here, a conventional communication method will be briefly described with reference to FIG. FIG. 8 is a diagram for explaining a case where the first communication terminal and the second communication terminal perform communication.

  First, when the first communication terminal and the second communication terminal execute service negotiation with the session control apparatus (S902), the session control apparatus includes service information including service classes of services performed by the first communication terminal and the second communication terminal. Is acquired (S904). Then, the session control device transmits a resource setting request to the access gateway (AGW) based on the acquired service information (S906). Here, the session control apparatus notifies the AGW of the bearer information necessary for the service (at least the requested bit rate, traffic class, delay / priority, etc.) as a QoS policy in the resource setting request.

  The AGW determines a QoS parameter according to the resource setting request (S908), and transmits a radio bearer setting request to the access point (AP) (S910). The QoS parameter is notified to the AP by this radio bearer setting request.

  The AP executes negotiation such as a scheduling configuration based on radio resources and communication terminal capabilities (S912). If communication is ensured, an ACK is transmitted from the AP to the AGW (S914). Further, when the AGW receives ACK from the AP, the AGW transmits a resource setting request to the session control device (S916).

Thereby, the communication path between the first communication terminal and the second communication terminal is set based on the bearer, and user data on the bearer of the set resource is transmitted and received.
3GPP TR 23.882; 3GPP System Architecture Evolution: Report on Technical Options and Conclusions

  Here, a conventional IMS session control apparatus has a specified value of a resource to be guaranteed for a service as a QoS policy, and starts providing a service to a communication terminal after securing a resource that satisfies the policy. However, when a predetermined resource cannot be secured, enough resources are secured and communication is started.

  In such a conventional resource setting method, if the requested resource cannot be secured, the best effort communication can be performed only with the available resource. After the best effort communication is started, the resource is improved and the first request is made. However, once the bearer that has been set is maintained until the end of communication, the communication terminal once ends communication and then restarts, etc. There was a problem that resources could not be reset. Therefore, even if the resource is improved, the resource is not assigned to the communication terminal.

  In order to solve this, there is a method of monitoring the state of the resource and the traffic amount so that the resource is reassigned if the resource can be used more abundantly after the communication setting, but a wired access network such as ADSL Unlike wireless resources monitoring, it requires a status notification from a communication terminal, which leads to system complications and difficulty in flexibly controlling limited wireless resources. There was a problem peculiar to the communication network and it was not realized.

  In view of the above-mentioned problems, the present invention aims to determine the required value of resources step by step and set the available resources, thereby guaranteeing the connectivity to the communication terminal and the optimum communication speed. An object of the present invention is to provide an access control apparatus that enables flexible change of resources to be set.

  In order to solve the above-described problems, an access control apparatus of the present invention is connected to a session control apparatus that controls a session of a communication terminal and a wireless access point that sets a radio resource in the communication terminal in a mobile communication network. In the access control device, when receiving information from the session control device that the communication terminal starts a session, first resource request value determining means for determining a first resource request value, and the determined first resource request value The first resource request means for requesting the resource setting according to the wireless access point, and when the resource setting by the first resource request value fails in the wireless access point, the first resource request value lower than the first resource request value. A second resource request value determining means for determining two resource request values; Second resource requesting means for requesting the wireless access point to perform resource setting according to the determined second resource request value, and retrying resource setting according to the first resource request value at a predetermined timing It has a retry determination means for determining.

  The access control apparatus according to the present invention further comprises first resource request value storage means for storing the first resource request value when resource setting by the first resource request value fails, wherein the first resource request means Is a means for reading a first resource request value stored in the first resource request value storage means and requesting setting of a radio resource when a retry is determined by the retry determination means. And

  Further, the access control apparatus according to the present invention, when the resource setting re-determination means re-determines that the radio resource can be set according to the first resource request value, according to the second resource request value. The present invention is characterized in that a session being executed with the set radio resource is continuously executed.

  In the access control apparatus according to the present invention, the retry determination unit may perform the retry determination at a timing when a predetermined time elapses during the session execution after the session is started.

  The access control apparatus according to the present invention is characterized in that, in the retry determination means, the timing for performing the retry determination is a timing when a handover of the communication terminal is detected.

  Further, in the access control device of the present invention, the retry determination timing in the retry determination means is that other communication terminals that are in the same area as the communication terminal and occupy the resource have released the resource. It is the timing which detected this.

  In the access control apparatus according to the present invention, the retry determination unit may be configured such that the retry determination timing is within the same area as the communication terminal and a handover has occurred in another communication terminal that occupies resources. It is the timing which detected this.

  According to the present invention, in an access control apparatus that performs control for setting a resource according to a resource request value, when a resource setting request necessary for communication of a communication terminal is received from the session control apparatus, the first resource request value is determined. And when the resource setting by a 1st resource request value fails, the 2nd resource request value lower than a 1st resource request value is determined. Here, when it is determined that there is a retry determination from the communication terminal, it is determined again whether the wireless resource can be set based on the first resource request value. Therefore, even if a session is established once in the second resource lower than the first resource request value, if the radio resource can be set by the first resource request value, the resource establishment by the first resource request value is retried and the session is retried. Establish.

  Hereinafter, an exemplary embodiment of an access control apparatus and a mobile communication system using the access control apparatus according to the present embodiment will be described with reference to the drawings.

  The access control apparatus according to the present invention realizes a method for enabling a communication terminal to make the most effective use of resources necessary for performing a service in a relatively easy manner while avoiding complication of the system. I took various measures. This will be described in detail below.

[System configuration]
FIG. 1 is a diagram illustrating an example in which an access control apparatus is applied to an access gateway (AGW) and arranged in a mobile communication system 1. The mobile communication system 1 is a network in which a session control device 10, an AGW 20, an access point (AP) 30, and a subscriber management server 40 are connected, and a communication terminal 50a is connected to the AP 30.

  The mobile communication system 1 is connected to the IP network via the IP router 60. A communication terminal 50b is connected to the IP network, and the communication terminal 50a and the communication terminal 50b provide a communication path via the mobile communication system 1 and the IP network to transmit and receive data.

  Note that the communication terminal 50 is used when the communication terminal 50a and the communication terminal 50b are collectively expressed. The session control device 10 and the subscriber management server 40 constitute an IMS.

  First, the session control device 10 will be described. The session control apparatus 10 includes a service information acquisition unit 102 and a QoS policy notification unit 104.

  The service information acquisition unit 102 mediates service negotiation performed when setting up a session between terminals, and includes a service type (CBR, VBR, ABR, best effort, etc.) and a traffic class (conversational type, interactive interactive type, streaming type). , Background type) and the like.

  The QoS policy notifying unit 104 selects resource request values (specified values such as bandwidth and allowable delay rate) to be guaranteed for each service except the best effort corresponding to the service information acquired by the service information acquiring unit 102. And notifies the resource setting unit 208 of the AGW 20. Here, the QoS policy differs depending on the network subscription form and communication capability for each communication terminal, and even if the resource is occupied by other communication terminals, a resource allocation is assigned to a certain communication terminal. This is information such as priority. Therefore, the QoS policy notification unit 104 is connected to the subscriber management server 40 and can acquire information such as the subscription form and communication capability of the communication terminal 50.

  Next, the AGW (access gateway) 20 will be described. The AGW 20 includes a location management unit 202, a retry determination unit 204, a storage unit 206, a resource setting unit 208, and a data transmission unit 210.

  The location management unit 202 is a functional unit that manages the location of the communication terminal 50 connected to the AP 30. The movement management unit 202 manages the movement of the communication terminal 50 input by the position management unit 302 of the AP 30. In addition, when the communication terminal 50a is out of the area where the AP 30 is located, the handover process is executed.

The retry determination unit 204 determines a retry at a timing after communication setting when a resource cannot be secured by the resource request value determined first.
Here, the retry determination is performed by the location management unit 202 that manages the location of the communication terminal 50, the handover of the communication terminal 50, the handover of another communication terminal located in the same area as the communication terminal 50, or the resource Judgment is made based on the release information.

  As a simpler method, a retry may be determined by setting a timer and elapse of a certain time after the start of communication. When the retry determination unit 204 determines the retry, the resource setting unit 208 calls the first resource request value held in the storage unit 206 and sets the resource.

The storage unit 206 is a storage unit that stores resource request values in association with communication terminal classes, traffic classes, and service types.

  Based on the QoS policy notified from the QoS policy notification unit 104, the resource setting unit 208 determines at least a resource request value such as a traffic class and an uplink / downlink data transmission rate, and sets a resource in the data transmission unit 210. Further, the first resource request value determined by the resource setting unit 208 is held in the storage unit 206 until the communication of the communication terminal 50 is completed.

  The data transmission unit 210 is a functional unit that transmits and receives data to and from the IP router 60. For example, a resource request value or the like input from the resource setting unit 208 is transmitted, or data from the communication terminal 50 a connected via the AP 30 is transmitted to or received from the IP router 60.

  Next, the access point (AP) 30 will be described. The AP 30 includes a radio resource setting unit 304, a movement detection unit 302, and a data transmission unit 306.

  The movement detection unit 302 is a functional unit that detects the movement of the communication terminal 50a. The movement detection unit 302 manages communication terminals located in the area where the AP 30 is located and controls handover.

  The radio resource setting unit 302 is a functional unit that determines a radio parameter such as a radio modulation scheme based on a resource request value from the AGW 20 and sets the radio parameter in the data transmission unit 306.

  The data transmission unit 306 performs communication via the data transmission unit 210 according to the set resource request value. That is, communication is performed with the communication terminal 50 b via the AGW 20 (data transmission unit 20) and the IP router 60.

  Note that FIG. 1 is a configuration example in the present embodiment, and it is needless to say that the present invention is not limited to this. For example, although the AGW 20 includes the location management unit 202 in the configuration example of FIG. 1, it may be configured as a location management device independently of the AGW 20 so as to handle location management signaling separately. Similarly, the session control device includes the QoS policy notification unit 104, but may be configured as a QoS policy server separately from the session control device.

  Here, the required value of the resource stored in the storage unit 206 of the AGW 20 will be described with reference to FIG. As shown in FIG. 2, the communication terminal class (for example, “class 1”), the traffic class (for example, “class 1 (conversational)”), and the service type (for example, “CBR”) are associated with each other. One resource request value (for example, “> 144 kbps”) and a second resource request value (for example, “> 64 kbps”) are stored.

  Here, the communication terminal class is a class of the communication terminal determined from the type of subscription form of the communication terminal that executes the service, the communication capability, and the like.

  The traffic class is stored according to the type of traffic. In this embodiment, “class 1” used for conversational communication, “class 2” used for bidirectional communication, There are “Class 3” used for streaming communication and “Class 4” used for background communication.

  The service type is stored according to the type of service provided. In this embodiment, CBR (Constant Bit Rate), VBR (Variable Bit Rate), ABR (Average Bit Rate: Available Bit Rate), and UBR (Unspecified Bit Rate: Unspecified Bit Rate). Rate).

  The resource request value is a request value for determining the bearer communication speed. For example, when the first resource request value is “> 144 kbps”, a communication speed higher than 144 kbps is requested, in other words, a communication speed of 144 kbps is guaranteed.

  Here, in FIG. 2, a method for the resource setting unit 208 to determine the resource request value will be briefly described. FIG. 2 is a table for determining resource request values stored in the storage unit 206 as described above. First, according to the QoS policy, the resource setting priority for the communication terminal determined from the type of communication terminal, the communication capability, etc. of the communication terminal executing the service is indicated as a communication terminal class.

  Also, request values corresponding to each traffic class and service type of the communication terminal are shown as a first resource request value and a second lease request value. In the case of this example, the resource required when the communication terminal of the communication terminal class 1 performs the traffic class 1 (conversational) communication by CBR has a first resource request value larger than 144 kbps, and the second resource request value Is greater than 64 kbps.

  FIG. 3 shows a flowchart of the processing of the AGW 20. When the AGW 20 receives the QoS policy notification from the session control apparatus 10 (step S100), the AGW 20 refers to the storage unit 206 according to parameters such as the traffic class and the maximum / minimum bit rate (up / down), and sets the first resource request value. Determine (step S102).

  Next, the AGW 20 executes a first resource setting try based on the first resource request value, and when successful (that is, when an ACK is returned from the AP 30), starts communication with the secured resource (step S104; Yes). → Step S106).

  On the other hand, when the first resource setting try fails (that is, when a NACK is returned from the AP 30), a second resource request value having a request level lower than the first resource request value is determined (step S104; No). → Step S108). Here, the first resource request value is temporarily stored in the storage unit 206. Note that the first resource request value stored in the storage unit 206 is held until the communication of the communication terminal 50 is completed.

  If the second resource setting try is performed successfully (step S110; Yes), communication is started with the secured second resource request value. Note that if the second resource setting try fails (step S110; No), the processing is terminated assuming that the resource could not be secured.

  Returning to step S112, description will be given. After communication is started by the second resource setting try, it is determined whether or not to retry (step S114). Here, the trigger for determining whether or not to retry is, for example, when the communication terminal 50 is handed over or when resources of other communication terminals located in the same AP as the communication terminal 50 are released.

  If it is determined to retry (step S114; Yes), the first resource request value is read (step S116), and the first resource setting retry is executed (step S118). Here, it is assumed that the first resource request value is read from the value temporarily stored.

  If the first resource setting retry is successful (step S118; Yes), communication is started based on the newly determined first resource request value (step S106). On the contrary, when the first resource setting try fails (step S118; No), the communication with the already set second resource request value is continued, and a retry is determined when there is an opportunity such as handover again. .

  As a trigger for determining the retry, timing such as a handover of the communication terminal 50 is used. Specifically, retry determination is performed when a handover notification of the communication terminal 50 from the handover source AP to the AGW 20 is received. This notification is normally performed when the communication terminal 50 is handed over across APs. Upon receiving this notification from the AP, the AGW 20 instructs the handover destination AP to set radio resources, and the communication terminal 50 performs the handover. Wireless resources set by the destination AP can be used.

  At this time, even if the handover source AP has set the resource according to the second resource request value, the AGW 20 does not request the handover destination AP to set the resource based on the original second resource request value. It is determined to retry the resource setting by one resource request value. This is because the handover destination AP has a good wireless environment and may set resources with the first resource request value.

  If the retry is determined and the resource setting by the first resource request value is successful at the handover destination AP, the communication terminal 50 can use the resource in a more favorable state than the resource before the handover (the resource set by the second resource request value). It becomes like this. However, when the resource setting by the first resource request value fails, the resource setting by the second resource request value is performed by the same procedure as Step S104; No → Step S108 → Step S110; Yes described in FIG.

  A point to be noted when the resource setting by the first resource request value fails is that there is a possibility of causing a handover delay by executing a retry. As an example of means for avoiding this, the QoS policy information notified from the session control apparatus 10 in step S100 is used.

  In the case of a traffic call of traffic class 1 and the like, since a certain level of delay is allowed compared to other classes, there is a method of determining a retry in the case of a traffic class 1 service. On the other hand, in the case of a traffic class 4 service such as an FTP service, since low delay is required, in order to maintain resource reservation by the second resource request value rather than resource setting of the first resource request value by retry, Determine not to retry.

  Further, the retry determination may be performed not only when a handover of the communication terminal 50 occurs but also when another communication terminal located in the same AP area as the communication terminal 50 hands over to another AP. This is because the resources that the communication terminal 50 can use in the area may increase due to the handover of another communication terminal. When the AGW 20 receives a handover notification from the handover source AP of the other communication terminal, It is determined to retry the resource setting for the communication terminal 50 located in the AP.

  Further, another communication terminal located in the same AP area as the communication terminal 50 may perform the retry determination at the timing when the communication is terminated. Similarly to the above, when other communication terminals terminate communication, there is a possibility that the resources that the communication terminal 50 can use in the area may increase. When the notification is received from the AP, it is determined to retry the resource setting for the communication terminal 50.

  FIG. 4 shows a sequence until communication is started between the communication terminal 50a and the communication terminal 50b. Although FIG. 4 shows only the processing on the communication terminal 50a side, it is assumed that the resource setting processing is similarly performed on the communication terminal 50b side.

  First, service negotiation of a service type and a traffic class to be executed is performed between the communication terminal 50a and the communication terminal 50b via the session control device 10 (S202). The session control device 20 acquires service information from the service negotiation (S204), selects a QoS policy, and transmits a resource setting request to the AGW 20 (S206).

  The AGW 20 determines a first resource request value from the storage unit 206 based on the QoS policy (S208), and transmits a radio bearer setting request to the AP 30 (S210). Further, the QoS parameter is notified to the AP 30 by the radio bearer setting request.

  Here, the AP 30 executes a negotiation such as a scheduling configuration based on radio resources and communication terminal capabilities (S212). That is, the AP 30 maps the QoS parameters notified by the radio bearer setting request to radio parameters such as uplink / downlink transmission rates, transmission power values, and the number of radio channels, and notifies the communication terminal 50a. If the notified wireless parameter is acceptable, “ACK” is transmitted to the AGW 30, and if not acceptable, “NACK” is transmitted.

  Here, the case where it is not allowable will be described as an example. The AP 30 transmits a NACK to the AGW 20 (S214). The AGW 20 that has received the NACK determines the second resource request value and temporarily stores the first resource request value in the storage unit 206 (S216). Then, a radio access bearer setting request based on the second resource request value is transmitted to the AP 30 (S218). Note that the modified QoS parameter is notified by the radio access bearer setting request.

  The AP 30 performs the above process again and executes negotiation with the communication terminal 50a (S220). In the present embodiment, it is assumed that the communication terminal 50a allows a radio parameter for the second resource request value. Accordingly, the AP 30 sets a radio resource and transmits an ACK to the AGW 20 (S222). When the AGW 20 sets resources on the wired side of the network, a bearer for transmitting data is set, and a communication session can be started. The AGW 20 transmits a resource setting response to the session control apparatus 10, and a session is started (S224).

  And a bearer is set between the communication terminal 50a and the communication terminal 50b, and communication will be performed on the bearer of the set resource.

  Next, FIG. 5 shows a procedure for resource setting retry performed after the session is started. In this example, the AGW 20 determines a retry when the communication terminal 50a is handed over.

  Here, an outline of the communication system is shown in FIG. As described above, the session control device 10, the AGW 20, and the subscriber management server 40 are connected to each other, and the AGW 20 is connected to an external network. The AGW 20 is connected to an AP 30a and an AP 30b. A case where a handover occurs due to the communication terminal 50a moving from the area where the AP 30a is located to the area where the AP 30b is located will be described with reference to the sequence diagram of FIG.

  First, referring to FIG. 6, the communication terminal 50a, the AP 30a, the AP 30b, the AGW 20, the session control device 10, and the communication terminal 50b are connected.

  First, the communication terminal 50a and the communication terminal 50b transmit and receive user data on the resource bearer set via the AGW 20 (S302). Here, when a handover request is transmitted from the communication terminal 50a to the AP 30a (S304), a handover process is executed between the AP 30a and the AP 30b (S306).

  When the handover process is executed, the AP 30a transmits a handover notification to the AGW 20 (S308). This is to notify the AGW 20 of the release of data transmission resources to the AP 30a normally performed at the time of handover.

  The AGW 20 receives the handover notification and determines to retry (S310), calls the first resource request value, and transmits a radio bearer setting request retry to the handover destination AP 30b (S312). Here, the QoS parameter is notified to the AP 30b by the radio bearer setting request retry.

  Then, a scheduling configuration and the like are negotiated from the radio resource and the communication terminal capability between the AP 30b and the communication terminal 50a (S314). Here, when resources according to the first resource request value are possible, ACK is transmitted from the AP 30b to the AGW 20 (S316). The bearer set in FIG. 4 (the bearer communication speed set based on the second resource request value) has been reestablished at the bearer speed set based on the newly secured first resource request value. And the session continues on that bearer.

  Also, other communication terminals connected to the same area of the AP 30a as the communication terminal 50a occupy the resource. However, since handover has been performed to another AP, the situation is similar to the above even in a situation where the resource becomes available. In response to the notification from the AP 30a, the AGW 20 can be used as a trigger for determining a resource setting retry to the communication terminal 50a.

  As described above, according to the present embodiment, when the communication terminal is connected to the mobile communication network, the communication speed of the bearer once secured changes as the communication status changes. Therefore, it is possible to realize an optimum communication speed even in a place where communication terminals are crowded.

  In the present embodiment, the first resource request value is described as being temporarily stored in the storage unit 206, but the resource request value stored in the storage unit 206 may be used. In this case, it is necessary to read the resource request value from the stored table again, but it is not necessary to temporarily store it.

  In addition, even if another communication terminal connected to the same area of the AP 30a as the communication terminal 50a occupies the resource, but the communication is terminated and the resource becomes available, the AP 30a notifies the AGW 20 of the resource release. Therefore, similarly, the AGW 20 can determine the retry based on the notification from the AP 30a.

  Further, in the present embodiment, it has been described that the processing is terminated when the second resource setting try fails based on the second resource request value. Of course, the fourth resource requirement value may be determined.

  As an example, FIG. 7 shows the contents up to the third resource request value. For example, in the CRB type of traffic class 2, “384 kbps” is set as the first resource request value, “288 kbps” is set as the second resource request value, and “144 kbps” is set as the third resource request value.

  At this time, first, the AGW 20 sets the first resource request value “384 kbps” and transmits a radio bearer setting request. Here, when NACK is received, the second resource request value “288 kbps” is set, and a radio bearer setting request is transmitted. Here, when NACK is received again, the third resource request value “144 kbps” is set, and a radio bearer setting request is transmitted. Here, when ACK is received, a bearer is set up with the communication terminal at “144 kbps”.

  Here, when the handover occurs, the first resource request value “384 kbps” is set again and the radio bearer setting request is transmitted again. Here, if an ACK is received, a bearer is set up with the communication terminal at “384 kbps”. If NACK is received, the second resource request value “144 kbps” is set, and a radio bearer setting request is transmitted. Here, when an ACK is received, a bearer is set up with the communication terminal at “144 kbps”.

  As described above, by providing a plurality of resource request values, it is possible to apply the request level in stages, and it is possible to guarantee the connectivity of the communication terminal and set an appropriate communication speed.

It is the figure which showed the block diagram of the whole network in this embodiment. It is a table that stores resource request values in association with each class and service type in a storage unit. It is a figure for demonstrating operation | movement of AGW. It is a sequence diagram for demonstrating communication between communication terminals. It is a figure which shows the outline of the communication system at the time of a hand-over. It is explanatory drawing for demonstrating the communication at the time of a hand-over. It is a resource requirement value memorize | stored in a memory | storage part as a modification. It is a figure for demonstrating the communication between the conventional communication terminals.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile communication system 10 Session control apparatus 102 Service information acquisition part 104 QoS policy notification part 20, 20a, 20b Access gateway 202 Location management part 204 Retry determination part 206 Storage part 208 Resource setting part 210 Data transmission part 30 Access point 302 Movement detection Unit 304 wireless resource setting unit 306 data transmission unit 40 subscriber management server 50, 50a, 50b communication terminal 60 IP router

Claims (7)

In a mobile communication network, in a session control device for controlling a session of a communication terminal, and an access control device connected to a wireless access point for setting a wireless resource in the communication terminal,
A first resource request value determining means for determining a first resource request value upon receiving information from the session control device that the communication terminal starts a session;
First resource requesting means for requesting the wireless access point to perform resource setting according to the determined first resource request value;
A second resource request value determining means for determining a second resource request value lower than the first resource request value when resource setting by the first resource request value fails in the wireless access point;
Second resource requesting means for requesting the wireless access point to perform resource setting according to the determined second resource request value;
With
An access control apparatus comprising retry determination means for determining a retry of resource setting according to the first resource request value at a predetermined timing. A first resource request value storage means for storing the first resource request value when resource setting by the first resource request value fails;
The first resource request unit reads a first resource request value stored in the first resource request value storage unit and requests a radio resource setting when a retry is determined by the retry determination unit. The access control apparatus according to claim 1, wherein the access control apparatus is a means.   If the setting of the resource according to the first resource request value succeeds after the determination of the retry, the session being executed with the resource set according to the second resource request value is changed to the first resource request value. The access control apparatus according to claim 1, wherein the resource is continuously executed with the resource set according to, and the resource set according to the second resource request value is released.   The access according to any one of claims 1 to 3, wherein, in the retry determination unit, the timing for performing the retry determination is a timing at which a predetermined time elapses during the session execution after the session is started. Control device.   4. The access control apparatus according to claim 1, wherein the retry determination unit performs a retry determination at a timing when a handover of the communication terminal is detected. 5.   In the retry determination means, the timing for performing the retry determination is a timing when it is detected that another communication terminal that is in the same area as the communication terminal and occupies the resource has released the resource. The access control apparatus according to any one of claims 1 to 3.   In the retry determination means, the timing for performing the retry determination is a timing at which it is detected that a handover has occurred in another communication terminal that is in the same area as the communication terminal and occupies resources. The access control apparatus according to any one of claims 1 to 3.

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