JP2008252372A - Communication controller and communication control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication controller and communication control method for allocating a QoS resource to a radio communication terminal that has made a new QoS setting request even though QoS resources of a base station are not sufficient when receiving the new QoS setting request from the radio communication terminal. <P>SOLUTION: When a base station allocation control part 150c determines that QoS resource allocated to a QoS setting request is not sufficient on the basis of QoS resources managed by a QoS resource storing part 180b when newly receiving the QoS setting request from a radio communication terminal, the base station allocation control part 150c controls a corresponding prescribed radio communication terminal among radio communication terminals managed by a terminal information storing part 180a be to hand-off to another base station or sector and allocates the QoS resource of the radio communication terminal handed-off to the radio communication terminal that has made the QoS setting request. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a communication control device and a communication control method in a mobile communication system.

In a mobile communication system using a CDMA (Code Division Multiple Access) method, a plurality of methods are generally used as a method of data transmission including moving image data transmitted and received in an application such as an IP-VT (Video Telephony) telephone. Has been adopted and introduced.
For example, in CDMA2000, as a data transmission method, a communication method using circuit switching (CDMA2000 1x) and a packet switching method are used. Uplink direction: 153.6 kbps, Downlink direction: Data rate (transmission speed) of about 2.4 Mbps (CDMA2000 1x EV-DO Rev. 0), and the Rev. A communication method (CDMA2000 1x EV-DO Rev. A) is defined that further speeds up the communication method of 0 and realizes a data rate (transmission speed) of about 1.8 Mbps in the upstream direction and about 3.1 Mbps in the downstream direction. (For example, see Non-Patent Document 1 and Non-Patent Document 2).
In addition, CDMA2000 1x EV-DO Rev. Another feature of A is that a function for controlling QoS (Quality of Service) is added.

  In the mobile communication system illustrated in FIG. 19, a radio communication terminal (AT: Access terminal) performs a handoff for switching a communication partner base station (AN: Access Network) according to a change in the reception intensity of a pilot signal or the like. However, in such a handoff, a handoff between base stations (AN) under the same base station control station (PCF: Packet Control Function) (hereinafter referred to as an inter-AN handoff) and a different base station control station (PCF: Packet) are used. Control Function) is a handoff between subordinate base stations (AN) (hereinafter referred to as an inter-PCF handoff). Specifically, the inter-AN handoff means that the radio communication terminal (AT) 10a shown in FIG. 19 is transferred from the base station (AN) 21a under the same base station control station (PCF) 30a to the base station (AN) 22a. Handoff between PCFs means that a wireless communication terminal (AT) 10b is controlled by a base station (AN) 23a subordinate to a base station control station (PCF) 30a to a base station control station (PCF) 30b. Handoff to base station (AN) 21b.

In the QoS technology of EV-DO, when a base station or sector that can be communicated to a wireless communication terminal is assigned by a Traffic Channel Assignment message, the base station or base station of the base station or sector assigned to the wireless communication terminal (Active Set, hereinafter referred to as “Aset”). It is conceivable to secure QoS resources for the wireless communication terminal.
For example, as shown in FIG. 7, when the wireless communication terminal AT1 for which the QoS resource is guaranteed moves and enters a state where it can communicate with both the base station ANα and the base station ANβ (hereinafter referred to as a 2-way state). It is conceivable that each of the base station ANα and the base station ANβ reserves QoS resources for the radio communication terminal AT1. Normally, when a wireless communication terminal performs a handoff, the wireless communication terminal enters a 2-way state, and in the 2-way state, the wireless communication terminal communicates with only one of the base stations specified by “DRC (Data Rate Control bit) Cover”. is doing.
"Cdma2000 High Rate Packet Data Air Interface 3GPP2 C.S0024 Version 4.0", 3GPP2, October 2002 (Section 8.5.6.1, Section 9.3.1.3.2.3.2) “Cdma2000 High Rate Packet Data Air Interface 3GPP2 C.S0024-A Version 2.0”, 3GPP2, July 2005 (Section 13.2.1.3.1.1, Section 13.3.1.3.1.1)

  When a wireless communication terminal enters the 2-Way state, only one of the base stations with which the wireless communication terminal actually communicates is secured, so the base station that does not communicate with the wireless communication terminal ensures QoS resources wastefully. It is assumed that For this reason, when the QoS resources of the base station are insufficient, when the number of wireless communication terminals to communicate with increases, the base station may assign a low rate QoS to the wireless communication terminals or reject a QoS setting request.

  For example, as shown in FIG. 2, when the radio communication terminal AT1 is handing off and the base station ANα and the base station ANβ both secure a high rate of QoS for the radio communication terminal AT1, Assume that a new call connection request accompanied by a high-rate QoS request is made from the wireless communication terminal AT2 in the communication area of ANα. In this case, the base station ANα can allocate a high-rate QoS to the radio communication terminal AT2 as long as the remaining QoS resource of the base station ANα is sufficient, and no problem occurs.

  FIG. 20 is a diagram illustrating a state when a low-rate QoS is assigned to the wireless communication terminal AT2. When the base station ANα allocates a high rate of QoS to the radio communication terminals AT1, AT3, and AT4 and QoS resources are insufficient, only the low rate of QoS can be secured. 600, 610, 630, and 640 are executed to assign a low rate QoS to the wireless communication terminal AT2. FIG. 21 is a diagram illustrating a state when the QoS request of the wireless communication terminal AT2 is rejected. When the QoS of the radio communication terminal AT2 cannot be ensured due to further lack of QoS resources, the base station ANα executes steps 600, 610, 630, and 650 of the flowchart of FIG. 22 to execute the QoS of the radio communication terminal AT2. Reject the request. 2, 20, and 21, the boxes shown outside the communicable area represent the resource amount of each base station, and the shaded portion represents the QoS resource remaining amount.

  FIG. 23 is a sequence diagram illustrating operations of the radio communication terminal AT2 and the base station ANα when assigning a low rate QoS to the radio communication terminal AT2. After establishing a connection between the wireless communication terminal AT2 and the base station ANα, when the wireless communication terminal AT2 requests a high and low rate QoS from the base station ANα based on the profile ID of the Attribute Update Request message, The station ANα determines the QoS assignment. Since the base station ANα has insufficient QoS resources and can only secure low-rate QoS, it determines that high-rate allocation is impossible, determines that low-rate allocation is possible, and determines the profile ( Profile) ID is “low rate”, and a low rate QoS is assigned to the wireless communication terminal AT2.

  FIG. 24 is a sequence diagram illustrating operations of the radio communication terminal AT2 and the base station ANα when rejecting the QoS request of the radio communication terminal AT2. After establishing a connection between the wireless communication terminal AT2 and the base station ANα, when the wireless communication terminal AT2 requests a high and low rate QoS from the base station ANα based on the profile ID of the Attribute Update Request message, The station ANα determines the QoS assignment. The base station ANα has insufficient QoS resources and cannot secure QoS. Therefore, the base station ANα determines that high-rate allocation is impossible, and further determines that low-rate allocation is impossible. ) The ID is set to “none” and the QoS request of the wireless communication terminal AT2 is rejected.

  As described above, when there is a QoS setting request from the wireless communication terminal to the base station to which the wireless communication terminal having a plurality of Assets belongs, the base station has a low resource for QoS of the base station. It is conceivable that a low-rate QoS is assigned to a wireless communication terminal that has made a QoS setting request, or a QoS setting request is rejected.

  Further, as shown in FIG. 7, when the wireless communication terminal AT1 is handing off and the base station ANα and the base station ANβ both secure a high rate of QoS for the wireless communication terminal AT1, FIG. As shown in FIG. 4, a case is assumed where the radio communication terminal AT2 for which QoS is guaranteed adds the base station ANβ to the Set of the radio communication terminal AT2 by handoff. In this case, as shown in the flowchart of FIG. 27, when the base station ANβ or the base station control station (PCF) receives a QoS reservation request for the wireless communication terminal AT2 to be handed off (step 700), If the remaining amount of the QoS resource of ANβ is sufficient and a high-rate QoS can be assigned to the wireless communication terminal AT2 (step 710), a high-rate QoS can be assigned to the wireless communication terminal AT2 (step 720). No problem arises. In addition, after step 720, the process proceeds to step 730, and the allocation result is reported to the base station ANα or the base station control station (PCF) that requested the QoS reservation.

  FIG. 25 is a diagram illustrating a state when a low-rate QoS is assigned to the wireless communication terminal AT2 when the wireless communication terminal AT2 hands off. When the base station ANβ allocates a high rate of QoS to the radio communication terminals AT1, AT3, AT4, and AT5 and lacks QoS resources, only the low rate of QoS can be secured. Steps 700, 710, 740 and 750 are executed to allocate a low rate QoS to the wireless communication terminal AT2. FIG. 26 is a diagram illustrating a state when the QoS request of the wireless communication terminal AT2 is rejected. When the base station ANβ allocates a high rate of QoS to the radio communication terminals AT1, AT3, AT4, and AT5 and QoS resources are insufficient, when the QoS of the radio communication terminal AT2 cannot be secured, Steps 700, 710, 740, and 760 of the flowchart are executed to reject the QoS request of the wireless communication terminal AT2. After steps 750 and 760, the process proceeds to step 730, and the allocation result is reported to the base station ANα or the base station control station (PCF) that has made a QoS reservation request.

  As shown in the flowchart of FIG. 28, when there is a handoff request from the radio communication terminal AT2 (step 800), the base station ANα adds the base station ANβ requested by the radio communication terminal AT2 to the Set of the radio communication terminal AT2. (Step 810), the base station ANβ added to the Set is requested to secure QoS (Step 820). When the QoS assignment result is received from the base station ANβ (step 830), QoS resources are reassigned to the radio communication terminal AT2 according to the result (step 840).

  FIG. 29 is a sequence diagram illustrating operations of the radio communication terminal AT2, the base station ANα, and the base station ANβ when assigning a low rate QoS to the radio communication terminal AT2. The radio communication terminal AT2 establishes a connection with the base station ANα, and further establishes a high-rate QoS, and then transmits a Route Update message including the base station ANα and the base station ANβ to the base station ANα. Make a handoff request. When the base station ANα receives the Route Update message and decides to add the base station ANβ to the Set of the wireless communication terminal AT2, the base station ANα makes a QoS request to the base station ANβ and includes the base station ANα and the base station ANβ. A Traffic Channel Assignment message is transmitted to the wireless communication terminal AT2. The wireless communication terminal AT2 receives this message and adds the base station ANβ to the Set of the wireless communication terminal AT2.

  Further, when there is a QoS request from the base station ANα, the base station ANβ determines the QoS allocation. Since the base station ANβ has insufficient QoS resources and can only secure low-rate QoS, it determines that high-rate allocation is impossible, determines that low-rate allocation is possible, and determines the profile ( Profile) ID is “low rate”, and a low rate QoS is assigned to the wireless communication terminal AT2. The low-rate allocation Attribute Update Request message is transmitted by the communicating base station (ANα or ANβ). Further, the base station ANβ notifies the base station ANα that a low rate QoS has been secured for the radio communication terminal AT2, and the base station ANα changes the QoS rate of the radio communication terminal AT2 to a low rate.

  FIG. 30 is a sequence diagram illustrating operations of the wireless communication terminal AT2, the base station ANα, and the base station ANβ when rejecting the QoS request of the wireless communication terminal AT2. The radio communication terminal AT2 establishes a connection with the base station ANα, and further establishes a high-rate QoS, and then transmits a Route Update message including the base station ANα and the base station ANβ to the base station ANα. Make a handoff request. When the base station ANα receives the Route Update message and decides to add the base station ANβ to the Set of the wireless communication terminal AT2, the base station ANα makes a QoS request to the base station ANβ and includes the base station ANα and the base station ANβ. A Traffic Channel Assignment message is transmitted to the wireless communication terminal AT2. The wireless communication terminal AT2 receives this message and adds the base station ANβ to the Set of the wireless communication terminal AT2.

  Further, when there is a QoS request from the base station ANα, the base station ANβ determines the QoS allocation. Since the base station ANβ has insufficient QoS resources and cannot secure QoS, the base station ANβ determines that high-rate allocation is impossible, and further determines that low-rate allocation is impossible, and determines the profile of the Attribute Update Request message (Profile ) The ID is set to “none” and the QoS request of the wireless communication terminal AT2 is rejected. The QoS rejected Attribute Update Request message is transmitted by the base station (any one of ANα and ANβ) in communication. In addition, the base station ANβ notifies the base station ANα to release the QoS resource of the wireless communication terminal AT2, and the base station ANα releases the QoS resource of the wireless communication terminal AT2.

  As described above, when a wireless communication terminal that is performing QoS communication adds an asset by handoff, if the QoS resource of the base station to be added is insufficient, a low-rate QoS is assigned to the wireless communication terminal, or QoS is It may be possible to reject the setting request.

  The present invention has been made in view of such problems, and an object of the present invention is when a QoS resource of a base station is insufficient when a new QoS setting request is received from a wireless communication terminal. Is providing a communication control apparatus and a communication control method capable of allocating a QoS resource to a wireless communication terminal that has made a new QoS setting request.

  In order to achieve the above object, a communication control apparatus of the present invention receives a message reporting a reception status of a radio communication terminal from a radio communication terminal, and sets a base station or sector that can be handed off based on the message to the radio communication An allocation unit to be allocated to a terminal, a management unit for managing a base station or a sector that can be handed off assigned by the allocation unit for each radio communication terminal, and a QoS setting request received from the radio communication terminal. QoS resource allocating means for allocating QoS resources in accordance with the QoS resource managing means for managing the QoS resources allocated by the resource allocating means, and when a QoS setting request is newly received from a wireless communication terminal, the QoS resource Based on the QoS resource managed by the management means, the QoS setting request is answered. Control means for performing control so that a predetermined wireless communication terminal is handed off to another base station or sector capable of handing off from among the wireless communication terminals managed by the management means when it is determined that QoS resource allocation is not sufficient It is characterized by providing.

  In addition, when the communication control method of the present invention newly receives a QoS setting request from a wireless communication terminal, and determines that the QoS resource allocation for the QoS setting request is not sufficient, The control is performed so that a predetermined wireless communication terminal is handed off to another base station or sector capable of handing off.

  Also, the communication control apparatus of the present invention receives a message reporting the reception status of the wireless communication terminal from the wireless communication terminal, and assigns a base station or sector that can be handed off to the wireless communication terminal based on the message A QoS resource allocation unit that receives a QoS setting request from a radio communication terminal and allocates a QoS resource in response to the QoS setting request, and a communicable base station allocated by the allocation unit for each radio communication terminal, or Management means for managing the QoS resources allocated by the sector and the QoS resource allocation means, QoS resource management means for managing the entire QoS resources allocated by the resource allocation means, and newly setting QoS from the radio communication terminal When the request is received, the entire QoS managed by the QoS resource management means If it is determined that the QoS resource allocation for the QoS setting request is not sufficient based on the resource, the QoS resource is allocated from the wireless communication terminals managed by the management unit, but the QoS is used. Control means for controlling to release a handoff base station or sector assigned to a wireless communication terminal that is not communicating.

  In addition, when the communication control method of the present invention newly receives a QoS setting request from a wireless communication terminal, and determines that the QoS resource allocation for the QoS setting request is not sufficient, Therefore, control is performed so as to release a base station or a sector that can be handed off, which is assigned to a wireless communication terminal that has been assigned QoS resources but is not performing communication using QoS.

  Further, the communication control device of the present invention includes an allocating means for allocating a communication channel to the radio communication terminal based on a message reporting the reception status of the radio communication terminal from the radio communication terminal, and a QoS setting request from the radio communication terminal. QoS resource allocating means for receiving and allocating QoS resources in response to the QoS setting request, management means for managing QoS resources allocated by the QoS resource allocating means for each wireless communication terminal, and the resource allocating means QoS resource management means for managing the QoS resources of the entire base station, and when a QoS setting request is newly received from the wireless communication terminal, based on the QoS resources of the entire base station managed by the QoS resource management means Determined that the QoS resource allocation for the QoS setting request is not sufficient In this case, control is performed so as to release the communication channel or the QoS resource of the wireless communication terminal that is assigned the QoS resource among the wireless communication terminals managed by the management unit but is not performing communication using the QoS. And a control means.

  In addition, when the communication control method of the present invention newly receives a QoS setting request from a wireless communication terminal, and determines that the QoS resource allocation for the QoS setting request is not sufficient, From the above, control is performed so as to release a communication channel or QoS resource of a wireless communication terminal that has been assigned QoS resources but is not performing communication using QoS.

  In the present invention, when a new QoS setting request is received from a wireless communication terminal, even when the QoS resource of the base station is insufficient, the base station communicates with the wireless communication terminal that has made a new QoS setting request. Since the QoS resource secured to the wireless communication terminal that does not affect the QoS can be allocated, the QoS resource of the base station can be used effectively.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a base station 100 used as a communication control device in the mobile communication system according to the first embodiment of the present invention. In the following description, the two base stations 100 are referred to as a base station ANα and a base station ANβ. Base station 100 of the present embodiment is configured to be able to perform data communication with a base station of a communication scheme of a CDMA2000 1x EV-DO communication scheme (hereinafter referred to as an EV-DO system) using antenna 110. As for the CDMA2000 1x EV-DO communication system, CDMA2000 1x EV-DO Rev. 0 and CDMA2000 1x EV-DO Rev. A, or CDMA2000 1x EV-DO Rev. Only A is supported.

  In addition to the antenna 110, the base station 100 includes an EV-DO RF unit 130, an RF control unit 140, a system control unit 150, a system storage unit 180, and the like. The RF control unit 140 includes a reception unit 140a and The system control unit 150 includes a base station allocation unit (allocation unit) 150a, a QoS resource allocation unit (QoS resource allocation unit) 150b, and a base station allocation control unit (control unit) 150c. The system storage unit 180 includes a terminal information storage unit (management unit) 180a and a QoS resource storage unit (QoS resource management unit) 180b. Note that connection diagrams to the PCF and other base stations are omitted.

  The EV-DO RF unit 130 converts data transmitted by the EV-DO system into a high-frequency signal and transmits it from the antenna 110, or converts data input from the antenna 110 into a high-frequency signal.

  The RF control unit 140 controls communication (transmission / reception) of the EV-DO system, and measures the strength (RSSI, etc.) of radio waves from the wireless communication terminal received by the antenna. Also, it functions as a reception unit 140a and a transmission unit 140b corresponding to the high-frequency signal input from the EV-DO RF unit 130 and the high-frequency signal output to the EV-DO RF unit 130. Also, a QoS setting request is received from the wireless communication terminal.

  The system control unit 150 is a control unit that controls each unit of the base station apparatus 100 in an integrated manner. The base station allocation unit 150a receives a Route Update message reporting the reception status of the wireless communication terminal from the wireless communication terminal, and sets a base station or a sector (Active Set) that can be handed off based on the message to the wireless communication terminal. The allocation and QoS resource allocation unit 150b receives a QoS setting request from the wireless communication terminal, and allocates a QoS resource according to the QoS setting request.

  When the base station allocation control unit 150c newly receives a QoS setting request from the wireless communication terminal, the base station allocation control unit 150c is sufficient to allocate the QoS resource to the QoS setting request based on the QoS resource managed by the QoS resource storage unit 180b. If not, control is performed so that a predetermined wireless communication terminal is handed off to another base station or sector capable of handing off from the wireless communication terminals managed by the terminal information storage unit 180a.

  The system storage unit 180 is configured by a memory such as a RAM, and stores application programs, temporary data, and the like. The terminal information storage unit 180a stores a terminal management table for managing a handoff base station or sector assigned by the base station allocating unit 150a for each wireless communication terminal. The terminal management table is a new wireless communication terminal. When the QoS setting request is received from the base station allocation control unit 150c, the base station allocation control unit 150c is used to select a wireless communication terminal to be handed off when determining that the QoS resource allocation for the QoS setting request is not sufficient. The QoS resource storage unit 180b manages the QoS resources allocated by the QoS resource allocation unit 150b.

  Next, a first example of the mobile communication system according to the first embodiment will be described. As shown in FIG. 2, the radio communication terminal AT1 is in a handoff, and the base station ANα and the base station ANβ are assigned to the ASet of the radio communication terminal AT1, and the base station ANα and the base station ANβ are Both secure high-rate QoS for the wireless communication terminal AT1. In the first embodiment, in such a state, when there is a new call connection request accompanied by a QoS setting request from the wireless communication terminal AT2 in the communicable area to the base station ANα, the base station ANα In order to secure QoS resources for the radio communication terminal AT2, as shown in FIG. 3, instruct the handoff to the radio communication terminal AT1 having a plurality of base stations assigned to the Set, as shown in FIG. The radio communication terminal AT1 is handed off to the base station ANβ.

  The base station ANα can release the QoS resource allocated to the radio communication terminal AT1 by handing off the radio communication terminal AT1 to the base station ANβ, and the QoS resource is recovered, as shown in FIG. High rate QoS can be allocated for the wireless communication terminal AT2.

  FIG. 5 is a sequence diagram illustrating operations of the radio communication terminal AT2, the radio communication terminal AT1, the base station ANα, and the base station ANβ. When the wireless communication terminal AT2 transmits a Connection Request message to the base station ANα, the base station ANα includes the base station ANα in the Traffic Channel Assignment message for assigning a communicable base station or sector to the wireless communication terminal. Send to. The wireless communication terminal AT2 receives this message and assigns the base station ANα to the Set of the wireless communication terminal AT2. When the wireless communication terminal AT2 makes a high / low rate QoS setting request to the base station ANα using the profile ID of the Attribute Update Request message, the base station ANα determines QoS allocation. When the base station ANα determines that the QoS resource allocation to the QoS setting request is not sufficient (insufficient) based on the QoS resource managed by the QoS resource storage unit 180b, the base station ANα is assigned to the Set from the terminal management table. Search for wireless communication terminals with multiple base stations. If the base station ANα finds a wireless communication terminal AT1 having a plurality of base stations assigned to the Set, the base station ANα removes the base station ANα from the Set of the wireless communication terminal AT1, and makes the base station or sector that can be handed off to the wireless communication terminal. The traffic channel assignment message to be assigned includes the base station ANβ and is transmitted to the radio communication terminal AT1. Upon receiving this message, the wireless communication terminal AT1 assigns only the base station ANβ to the Set of the wireless communication terminal AT1. Also, the base station ANα releases the QoS resource of the radio communication terminal AT1, assigns a high rate QoS to the radio communication terminal AT2 that requested QoS, and sets the profile ID of the Attribute Update Request message to “high rate”. Then, a high rate QoS is set in the wireless communication terminal AT2.

  FIG. 6 is a flowchart for explaining the operation of the base station ANα. When the base station ANα receives a QoS setting request from the wireless communication terminal AT2 by an Attribute Update Request message (step 101), the base station ANα can perform high-rate QoS allocation based on the QoS resource managed by the QoS resource storage unit 180b. (Step 102), and if a high-rate QoS assignment is possible, the high-rate QoS is assigned to the wireless communication terminal AT2 that requested the QoS (step 103). In step 102, if high-rate QoS assignment is impossible, a wireless communication terminal having a plurality of base stations assigned to the Set is searched from the terminal management table (step 104). In step 105, if a wireless communication terminal AT1 having a plurality of base stations assigned to the Set is found, the base station ANα is removed from the Set of the wireless communication terminal AT1, and the wireless communication terminal AT1 is handed off to another base station ANβ. (Step 106), the QoS resource of the radio communication terminal AT1 is released (step 107). Then, a high-rate QoS is assigned to the wireless communication terminal AT2 that has requested the QoS (step 103). In step 105, if a wireless communication terminal having a plurality of base stations assigned to the set cannot be found, it is determined whether or not low-rate QoS assignment is possible (step 108), and low-rate QoS assignment is possible. If so, a low-rate QoS is assigned to the wireless communication terminal AT2 that requested the QoS (step 109). In step 108, if QoS allocation at a low rate is impossible, the QoS setting request of the wireless communication terminal AT2 is rejected (step 110).

  Next, a second example of the mobile communication system according to the first embodiment will be described. As shown in FIG. 7, the wireless communication terminal AT1 is in handoff, and the base station ANα and the base station ANβ are assigned to the Set of the wireless communication terminal AT1. A base station ANα is assigned to the Set of the wireless communication terminal AT2. Both the base station ANα and the base station ANβ ensure a high rate of QoS for the radio communication terminal AT1. In the second embodiment, when the wireless communication terminal AT2 is handed off in such a state and becomes communicable with the base stations ANα and ANβ as shown in FIG. 8, the QoS of the base station ANβ When the resources are small, as shown in FIG. 9, in order to secure QoS resources for the wireless communication terminal AT2, the wireless communication terminal AT1 having a plurality of base stations assigned to the Set is instructed to perform handoff, and wireless communication is performed. The terminal AT1 is handed off to the base station ANα.

  The base station ANβ can release the QoS resource allocated to the radio communication terminal AT1 by handing off the radio communication terminal AT1 to the base station ANα, and the QoS resource is recovered, as shown in FIG. High rate QoS can be allocated for the wireless communication terminal AT2.

  FIG. 11 is a sequence diagram illustrating operations of the radio communication terminal AT2, the radio communication terminal AT1, the base station ANα, and the base station ANβ. The base station ANα is assigned to the Set of the radio communication terminal AT2, and the base station ANα and the base station ANβ are assigned to the Set of the radio communication terminal AT1. The radio communication terminal AT2 establishes a connection with the base station ANα, and further establishes a high-rate QoS, and then transmits a Route Update message including the base station ANα and the base station ANβ to the base station ANα. Request handoff setting. When the base station ANα receives the Route Update message and decides to add the base station ANβ to the Set of the wireless communication terminal AT2, the base station ANα makes a QoS setting request to the base station ANβ and can perform handoff. Is transmitted to the wireless communication terminal AT2 by including the base station ANα and the base station ANβ in the Traffic Channel Assignment message for allocating to the wireless communication terminal. The wireless communication terminal AT2 receives this message and adds the base station ANβ to the Set of the wireless communication terminal AT2.

  In addition, when there is a QoS setting request from the base station ANα, the base station ANβ determines QoS allocation. When the base station ANβ determines that the QoS resource allocation to the QoS setting request is not sufficient (insufficient) based on the QoS resource managed by the QoS resource storage unit 180b, the base station ANβ is assigned to the Set from the terminal management table. Search for wireless communication terminals with multiple base stations. If the base station ANβ finds a wireless communication terminal AT1 having a plurality of base stations assigned to the Set, the base station ANβ removes the base station ANβ from the Set of the wireless communication terminal AT1, and wirelessly communicates a Traffic Channel Assignment message including the base station ANα. Transmit to terminal AT1. The wireless communication terminal AT1 receives this message and assigns only the base station ANα to the Set of the wireless communication terminal AT1. Further, the base station ANβ releases the QoS resource of the radio communication terminal AT1, assigns a high rate QoS to the radio communication terminal AT2 that has requested the QoS setting, and assigns a high rate to the base station ANα for the radio communication terminal AT2. Notify that QoS has been secured.

  FIG. 12 is a flowchart for explaining the operation of the base station ANα. When there is a handoff request from the wireless communication terminal AT2 by the RouteUpdate message (step 201), the base station ANα adds the base station ANβ requested by the wireless communication terminal AT2 to the Set of the wireless communication terminal AT2 (step 202). The base station ANβ added to the Set is requested to secure QoS (step 203). When the base station ANα receives the QoS assignment result from the base station ANβ added to the Set (step 204), the base station ANα reassigns the QoS resource to the wireless communication terminal AT2 according to the result (step 205).

  FIG. 13 is a flowchart for explaining the operation of the base station ANβ. When there is a QoS reservation request for the radio communication terminal AT2 to be handed off from the base station ANα or a higher-level base station control station (PCF) that controls the plurality of base stations (step 301), the base station ANβ performs QoS resource storage Based on the QoS resource managed in 180b, it is determined whether or not high-rate QoS allocation is possible (step 302). If high-rate QoS allocation is possible, the wireless communication terminal AT2 that requested QoS is notified to the wireless communication terminal AT2. A high-rate QoS is assigned (step 303), and the assignment result is reported to the base station ANα that has requested QoS reservation (step 304). In step 302, if high-rate QoS assignment is impossible, a wireless communication terminal having a plurality of base stations assigned to the Set is searched from the terminal management table (step 305). In Step 306, if a wireless communication terminal AT1 having a plurality of base stations assigned to the Set is found, the base station ANβ is removed from the Set of the wireless communication terminal AT1, and the wireless communication terminal AT1 is handed off to another base station ANα. (Step 307), the QoS resource of the wireless communication terminal AT1 is released (Step 308). Then, a high-rate QoS is assigned to the wireless communication terminal AT2 that has requested QoS (step 303), and the assignment result is reported to the base station ANα that has requested QoS reservation (step 304). In step 306, if a wireless communication terminal having a plurality of base stations assigned to the set cannot be found, it is determined whether or not low-rate QoS assignment is possible (step 309), and low-rate QoS assignment is possible. If so, a low-rate QoS is allocated to the wireless communication terminal AT2 to be handed off (step 310), and the allocation result is reported to the base station ANα that requested the QoS reservation (step 304). In step 309, if low-rate QoS allocation is impossible, the QoS request of the wireless communication terminal AT2 to be handed off is rejected (step 311), and the allocation result is reported to the base station ANα that has requested QoS reservation ( Step 304).

  Next, how to select a wireless communication terminal to be handed off will be described. FIG. 14 is an example of a terminal management table of the terminal information storage unit 180a used for selecting a wireless communication terminal to be handed off. The QoS rate is assigned by the base station to the wireless communication terminal, and the base station (α, β,...) Of the ASet is assigned by the base station to the wireless communication terminal. The radio field intensity of the base station (α, β,...) Of the ASet can be acquired by the base station using a Route Update message. In the present invention, it is not necessary to add or change a special message in order to obtain such information.

  When the base station allocation control unit 150c of the base station newly receives the QoS setting request from the wireless communication terminal, the base station allocation control unit 150c determines the QoS resource for the QoS setting request based on the QoS resource managed by the QoS resource storage unit 180b. When it is determined that the allocation is not sufficient (insufficient), a radio communication terminal is selected according to the following selection method, and the radio communication terminal is handed off to another base station or sector capable of handing off.

In the first selection method, a radio communication terminal having the largest number of base stations or sectors among the radio communication terminals managed in the terminal management table is handed off to another base station or sector that can be handed off. The reason why the base station or the radio communication terminal with the largest number of sectors is handed off is that there is a high possibility that the base station or the base station can communicate stably with other base stations. It is also a wireless communication terminal that occupies the most QoS resources for the system.
The second selection method is capable of handing off a wireless communication terminal whose received electric field strength is lower than a predetermined threshold among wireless communication terminals to which QoS resources are allocated based on a Route Update message that reports the reception status of the wireless communication terminal. Handoff to other base stations or sectors. A wireless communication terminal whose received electric field strength is lower than a predetermined threshold value may be handed off to another base station or sector because the received electric field strength of the base station or sector is originally low even if the base station is removed from the set. This is because the influence is small. Other base stations or sectors are more likely to have better received field strength.
The third selection method is based on a Route Update message that reports the reception status of the wireless communication terminal, or another base that can handoff a base station that can be handed off or a wireless communication terminal that has a received field strength of a sector that exceeds a predetermined threshold. Handoff to a station or sector. This is because, even if released, stable communication can be performed at the handoff destination base station, and system utilization efficiency can be improved at both base stations.
In the fourth selection method, a wireless communication terminal having a QoS priority lower than the QoS priority for the QoS setting request is handed off to another base station or sector capable of handing off. This is because an emergency call or the like can be given priority by selecting a wireless communication terminal based on the priority of QoS.
In the fifth selection method, a wireless communication terminal having a QoS rate higher than a predetermined threshold is handed off to another base station or sector capable of handing off. This is because a wireless communication terminal with a high QoS rate can secure a large number of free resources.
The sixth selection method is a method for handing off a radio communication terminal with a small fluctuation in the reception status of the radio communication terminal to another base station or sector capable of handing off based on a Route Update message for reporting the reception status of the radio communication terminal. It is. This is because the communication is not interrupted even if it is not 2 Way because it is not moving.

  In addition, by applying a combination of the above-described selection methods, the wireless communication terminal may be handed off to another base station or sector capable of handoff, or a plurality of selection methods may be applied with priority. The wireless communication terminal may be handed off to another base station or sector capable of handing off.

  In addition, although the example which uses a base station as a communication control apparatus which is a component of a mobile communication system was shown in FIG. 1, when using a base station control station (PCF: Packet Control Function) as a communication control apparatus, By implementing in the base station control station what corresponds to the configuration and functions of the base station described above, the base station control station realizes processing unique to the present invention (QoS resource allocation processing, etc.) realized in the base station. can do.

  FIG. 15 is a block diagram showing a configuration of a base station control station (PCF) 200 used as a communication control device in the mobile communication system according to the second embodiment of the present invention. The base station control station (PCF) 200 includes a communication interface 210, a system control unit 250, a system storage unit 280, and the like. The system control unit 250 includes a base station allocation unit (allocation unit) 250a, a QoS resource allocation unit (QoS resource allocation unit) 250b, and a base station allocation control unit (control unit) 250c. The system storage unit 280 includes: A terminal information storage unit (management unit) 280a and a QoS resource storage unit (QoS resource management unit) 280b are included.

  The communication interface 210 transmits / receives data to / from devices such as a base station and an upper station (PDSN).

  The system control unit 250 is a control unit that controls each unit of the base station control station (PCF) 200 in an integrated manner. When the base station receives a Route Update message reporting the reception status of the wireless communication terminal from the wireless communication terminal, the base station allocation unit 250a receives the information of this message from the base station and can perform handoff based on this information. A base station or a sector (ActiveSet) is assigned to the wireless communication terminal, and when the base station receives a QoS setting request from the wireless communication terminal, the QoS resource assignment unit 250b assigns a QoS resource in response to the QoS setting request.

  When the base station newly receives a QoS setting request from the wireless communication terminal, the base station allocation control unit 250c determines the QoS setting request based on the QoS resource of the base station managed by the QoS resource storage unit 280b. Is determined to be insufficient (insufficient), QoS resources are allocated from among the wireless communication terminals managed by the terminal information storage unit 280a, but communication using QoS is performed. A base station or a sector (a base station whose DRC Cover does not indicate the base station) that can be handed off assigned to a wireless communication terminal that has not been performed is searched, and the base station of the search result is a wireless communication terminal that is the base station. Control to release the base station. Also, the base station allocation control unit 250c allocates QoS resources among the wireless communication terminals managed by the terminal information storage unit 280a, but among the wireless communication terminals that do not perform communication using QoS, A base station or a sector (a base station whose DRC Cover does not indicate the base station) that can be handed off assigned to a wireless communication terminal that is assigned a QoS rate higher than a predetermined threshold is searched, and the base station of the search result is The base station may be released from the wireless communication terminal that is the base station.

  The system storage unit 280 is configured by a memory such as a RAM, and stores application programs, temporary data, and the like. The terminal information storage unit 280a manages a communicable base station or sector allocated by the base station allocation unit 250a for each wireless communication terminal, and QoS resources allocated by the QoS resource allocation unit 250b. The QoS resource storage unit 280b manages the entire QoS resources allocated by the QoS resource allocation unit 250b.

  FIG. 16 is a flowchart for explaining the operation of the base station control station (PCF). When the base station control station (PCF) receives a QoS setting request from the wireless communication terminal to the base station by an Attribute Update Request message (step 401), the base station control station (PCF) sets the QoS resource of the base station managed by the QoS resource storage unit 280b. Based on this, it is determined whether or not high-rate QoS assignment is possible (step 402). If high-rate QoS assignment is possible, high-rate QoS is assigned to the wireless communication terminal that requested QoS (step 403). . In step 402, if high-rate QoS allocation is impossible, the base station searches the base station for a radio communication terminal having a plurality of base stations allocated to Set (step 404). The presence or absence of a wireless communication terminal having a plurality of stations is determined (step 405). In step 405, if a wireless communication terminal having a plurality of base stations assigned to the Set is found, a QoS resource is assigned to the wireless communication terminal managed by the terminal information storage unit 280a. It is determined whether or not there is a wireless communication terminal that is not performing communication (step 406). In step 406, if a wireless communication terminal that has assigned QoS resources but is not performing communication using QoS is discovered, the base station or sector is removed from the set of the wireless communication terminal, and QoS is used. QoS resources of wireless communication terminals that are not communicating are released (step 407). Then, a high-rate QoS is assigned to the wireless communication terminal that has requested the QoS (step 403). In step 405, if a wireless communication terminal having a plurality of base stations assigned to the Set cannot be found, or if a wireless communication terminal that does not use QoS is not found in step 406, a low-rate communication is performed. It is determined whether QoS allocation is possible (step 408). If low-rate QoS allocation is possible, low-rate QoS is allocated to the wireless communication terminal that requested QoS (step 409). In step 408, if low-rate QoS allocation is impossible, the QoS setting request of the wireless communication terminal that requested QoS is rejected (step 410).

  FIG. 17 is a block diagram showing a configuration of a base station 300 used as a communication control device in the mobile communication system according to the third embodiment of the present invention. In addition to the antenna 310, the base station 300 includes an EV-DO RF unit 330, an RF control unit 340, a system control unit 350, a system storage unit 380, and the like. The RF control unit 340 includes a reception unit 340a and The system control unit 350 includes a base station allocation unit (allocation unit) 350a, a QoS resource allocation unit (QoS resource allocation unit) 350b, and a base station allocation control unit (control unit) 350c. The system storage unit 380 includes a terminal information storage unit (management unit) 380a and a QoS resource storage unit (QoS resource management unit) 380b. Note that connection diagrams to the PCF and other base stations are omitted.

  The EV-DO RF unit 330 converts data transmitted by the EV-DO system into a high-frequency signal and transmits it from the antenna 310, or converts data input from the antenna 310 into a high-frequency signal.

  The RF control unit 340 controls communication (transmission / reception) of the EV-DO system and measures the intensity (such as RSSI) of radio waves from the wireless communication terminal received by the antenna. Also, it functions as a receiving unit 340 a and a transmitting unit 340 b in response to a high-frequency signal input from the EV-DO RF unit 330 and a high-frequency signal output to the EV-DO RF unit 330. Also, a QoS setting request is received from the wireless communication terminal.

  The system control unit 350 is a control unit that controls each unit of the base station 300 in an integrated manner. The base station allocation unit 350a allocates a communication channel to the radio communication terminal based on a Route Update message that reports the reception status of the radio communication terminal from the radio communication terminal, and the QoS resource allocation unit 350b receives the QoS from the radio communication terminal. When a setting request is received, a QoS resource is allocated according to the QoS setting request.

  When the base station allocation control unit 350c newly receives a QoS setting request from the wireless communication terminal, the base station allocation control unit 350c performs QoS resource for the QoS setting request based on the QoS resource of the entire base station managed by the QoS resource storage unit 380b. Communication channel of a wireless communication terminal that is assigned QoS resources but is not performing communication using QoS among wireless communication terminals managed by the terminal information storage unit 380a. Alternatively, control is performed to release QoS resources. In addition, the base station allocation control unit 350c allocates QoS resources among the wireless communication terminals managed by the terminal information storage unit 380a, but among the wireless communication terminals that do not perform communication using QoS, A base station or a sector (a base station whose DRC Cover does not indicate the base station) that can be handed off assigned to a wireless communication terminal that is assigned a QoS rate higher than a predetermined threshold may be released.

  The system storage unit 380 is configured by a memory such as a RAM, and stores application programs, temporary data, and the like. The terminal information storage unit 380a manages the QoS resources allocated by the QoS resource allocation unit 350b for each wireless communication terminal. The QoS resource storage unit 380b manages the QoS resources of the entire base station allocated by the QoS resource allocation unit 350b.

  FIG. 18 is a flowchart for explaining the operation of the base station. When the base station receives a QoS setting request from the wireless communication terminal to the base station through an Attribute Update Request message (step 501), the base station determines a high rate based on the QoS resources of the entire base station managed by the QoS resource storage unit 380b. It is determined whether or not QoS allocation is possible (step 502). If high-rate QoS allocation is possible, high-rate QoS is allocated to the wireless communication terminal that requested QoS (step 503). In step 502, if high-rate QoS allocation is impossible, QoS resources are allocated in the wireless communication terminal managed by the terminal information storage unit 280a, but communication using QoS is not performed. It is determined whether there is a wireless communication terminal (step 504). In step 504, if a wireless communication terminal to which QoS resources are allocated but not using QoS is found, the communication channel or QoS resource of the wireless communication terminal is released (step 505). Then, a high-rate QoS is allocated to the wireless communication terminal that has requested the QoS (step 503). In step 504, if QoS resources are allocated, but a wireless communication terminal that is not performing communication using QoS cannot be found, it is determined whether or not low-rate QoS allocation is possible (step 506). If low-rate QoS allocation is possible, low-rate QoS is allocated to the wireless communication terminal that requested QoS (step 507). In step 506, if low-rate QoS allocation is impossible, the QoS setting request of the wireless communication terminal that requested QoS is rejected (step 508).

It is a block diagram which shows the structure of the base station used as a communication control apparatus in the mobile communication system of 1st Embodiment of this invention. It is a figure explaining the case where there is a new call connection request accompanied by a high-rate QoS request from the radio communication terminal AT2 in the communicable area of the base station ANα. It is a figure explaining hand-off of radio | wireless communication terminal AT1 to base station AN (beta). It is a figure explaining allocating QoS of high rate for radio | wireless communication terminal AT2. It is a sequence diagram explaining operation | movement of radio | wireless communication terminal AT2, radio | wireless communication terminal AT1, base station AN (alpha), and base station AN (beta). It is a flowchart explaining operation | movement of base station AN (alpha). It is a figure which shows that radio | wireless communication terminal AT1 is in the state which can communicate with both base station AN (alpha) and base station AN (beta). It is a figure explaining that base station AN (beta) was added to Asset of radio | wireless communication terminal AT2 by handoff. It is a figure explaining hand-off of radio | wireless communication terminal AT1 to base station AN (alpha). It is a figure explaining allocating QoS of high rate for radio | wireless communication terminal AT2. It is a sequence diagram explaining operation | movement of radio | wireless communication terminal AT2, radio | wireless communication terminal AT1, base station AN (alpha), and base station AN (beta). It is a flowchart explaining operation | movement of base station AN (alpha). It is a flowchart explaining operation | movement of base station AN (beta). It is a figure which shows an example of a terminal management table. It is a block diagram which shows the structure of the base station control station (PCF) used as a communication control apparatus in the mobile communication system of 2nd Embodiment of this invention. It is a flowchart explaining operation | movement of a base station control station (PCF). It is a block diagram which shows the structure of the base station used as a communication control apparatus in the mobile communication system of 3rd Embodiment of this invention. It is a flowchart explaining operation | movement of a base station. It is a figure which shows the structural example of a mobile communication system. It is a figure which shows a state when QoS of low rate is allocated to radio | wireless communication terminal AT2. It is a figure which shows a state when the QoS request | requirement of radio | wireless communication terminal AT2 is refused. It is a flowchart explaining operation | movement of base station AN (alpha). It is a sequence diagram explaining operation | movement of radio | wireless communication terminal AT2 and base station AN (alpha) when assigning low-rate QoS to radio | wireless communication terminal AT2. It is a sequence diagram explaining operation | movement of radio | wireless communication terminal AT2 and base station AN (alpha) when rejecting the QoS request | requirement of radio | wireless communication terminal AT2. It is a figure which shows a state when low-rate QoS is allocated to radio | wireless communication terminal AT2 when radio | wireless communication terminal AT2 hands off. It is a figure which shows a state when the QoS request | requirement of radio | wireless communication terminal AT2 is refused. It is a flowchart explaining operation | movement of base station AN (beta). It is a flowchart explaining operation | movement of base station AN (alpha). It is a sequence diagram explaining operation | movement of radio | wireless communication terminal AT2, base station AN (alpha), and base station AN (beta) when assigning low-rate QoS to radio | wireless communication terminal AT2. It is a sequence diagram explaining operation | movement of radio | wireless communication terminal AT2, base station AN (alpha), and base station AN (beta) when rejecting the QoS request | requirement of radio | wireless communication terminal AT2.

Explanation of symbols

100, 200, 300 Base station 110, 310 Antenna 130, 330 EV-DO RF unit 140, 340 RF control unit 140a, 340a Receiver unit 140b, 340b Transmitter unit 150, 250, 350 System control unit 150a, 250a, 350a Base Station allocation unit 150b, 250b, 350b QoS resource allocation unit 150c, 250c, 350c Base station allocation control unit 180, 280, 380 System storage unit 180a, 280a, 380a Terminal information storage unit 180b, 280b, 380b QoS resource storage unit 210 Communication interface

Claims (14)

Allocating means for receiving a message reporting the reception status of the wireless communication terminal from the wireless communication terminal, and allocating a base station or sector capable of handoff based on the message to the wireless communication terminal;
Management means for managing a handoff base station or sector assigned by the assignment means for each wireless communication terminal;
QoS resource allocating means for receiving a QoS setting request from a wireless communication terminal and allocating a QoS resource in response to the QoS setting request;
QoS resource management means for managing QoS resources allocated by the resource allocation means;
When a QoS setting request is newly received from a wireless communication terminal, based on the QoS resource managed by the QoS resource management unit, when it is determined that the QoS resource allocation for the QoS setting request is not sufficient, Control means for controlling the predetermined wireless communication terminal from among the wireless communication terminals managed by the management means to be handed off to another base station or sector capable of handing off;
A communication control device.   When the control unit newly receives a QoS setting request from a wireless communication terminal, the control unit may not allocate a QoS resource for the QoS setting request based on the QoS resource managed by the QoS resource management unit. The wireless communication terminal having the largest number of base stations or sectors among the wireless communication terminals managed by the management means is handed off to another base station or sector that can be handed off. The communication control apparatus according to 1.   When the control unit newly receives a QoS setting request from a wireless communication terminal, the control unit may not allocate a QoS resource for the QoS setting request based on the QoS resource managed by the QoS resource management unit. If it is determined, based on a message reporting the reception status of the wireless communication terminal, another base capable of handing off a wireless communication terminal having a received electric field strength lower than a predetermined threshold among wireless communication terminals to which QoS resources are allocated The communication control apparatus according to claim 1, wherein handoff is performed to a station or a sector.   When the control unit newly receives a QoS setting request from a wireless communication terminal, the control unit may not allocate a QoS resource for the QoS setting request based on the QoS resource managed by the QoS resource management unit. If it is determined, based on the message reporting the reception status of the wireless communication terminal, to the base station or sector capable of handing off a wireless communication terminal whose received field strength of the base station or sector capable of handing off exceeds a predetermined threshold The communication control apparatus according to claim 1, wherein the communication control apparatus performs handoff.   When the control unit newly receives a QoS setting request from a wireless communication terminal, the control unit may not allocate a QoS resource for the QoS setting request based on the QoS resource managed by the QoS resource management unit. 2. The communication according to claim 1, wherein when the determination is made, the wireless communication terminal whose QoS priority is lower than the QoS priority for the QoS setting request is handed off to another base station or sector capable of handing off. Control device.   When the control unit newly receives a QoS setting request from a wireless communication terminal, the control unit may not allocate a QoS resource for the QoS setting request based on the QoS resource managed by the QoS resource management unit. 2. The communication control apparatus according to claim 1, wherein when judged, the wireless communication terminal having a QoS rate higher than a predetermined threshold value is handed off to another base station or sector capable of handing off.   When the control unit newly receives a QoS setting request from a wireless communication terminal, the control unit may not allocate a QoS resource for the QoS setting request based on the QoS resource managed by the QoS resource management unit. If determined, based on a message reporting the reception status of the wireless communication terminal, the wireless communication terminal with a small variation in the reception status of the wireless communication terminal is handed off to another base station or sector capable of handing off. The communication control device according to claim 1.   When a QoS setting request is newly received from a wireless communication terminal, if it is determined that QoS resources are not sufficiently allocated for the QoS setting request, a predetermined wireless communication terminal can be handed off from other wireless communication terminals. A communication control method of a communication control apparatus that controls to handoff to another base station or sector. Allocating means for receiving a message reporting the reception status of the wireless communication terminal from the wireless communication terminal, and allocating a base station or sector capable of handoff based on the message to the wireless communication terminal;
QoS resource allocating means for receiving a QoS setting request from a wireless communication terminal and allocating a QoS resource in response to the QoS setting request;
A communication base station or sector assigned by the assignment means for each wireless communication terminal, and a management means for managing the QoS resources assigned by the QoS resource assignment means;
QoS resource management means for managing the overall QoS resources allocated by the resource allocation means;
When a QoS setting request is newly received from a wireless communication terminal, based on the overall QoS resources managed by the QoS resource management means, it is determined that the QoS resource allocation for the QoS setting request is not sufficient Releases a base station or sector that can be handed off to a wireless communication terminal that is assigned QoS resources but is not performing communication using QoS, from among the wireless communication terminals managed by the management means. Control means for controlling
A communication control device.   The control means allocates QoS resources from among the wireless communication terminals managed by the management means, but is higher than a predetermined threshold among wireless communication terminals that do not perform communication using QoS. 10. The communication control apparatus according to claim 9, wherein a base station or a sector that can be handed off assigned to a wireless communication terminal to which a rate is assigned is released.   When a QoS setting request is newly received from a wireless communication terminal, if it is determined that the QoS resource allocation for the QoS setting request is not sufficient, QoS resources are allocated from other wireless communication terminals. A communication control method of a communication control apparatus for controlling to release a handoff base station or sector assigned to a wireless communication terminal that is not performing communication using QoS. Allocating means for allocating a communication channel to the radio communication terminal based on a message reporting the reception status of the radio communication terminal from the radio communication terminal;
QoS resource allocation means for receiving a QoS setting request from a wireless communication terminal and allocating a QoS resource in response to the QoS setting request;
Management means for managing the QoS resources assigned by the QoS resource assignment means for each wireless communication terminal;
QoS resource management means for managing QoS resources of the entire base station assigned by the resource assignment means;
When a QoS setting request is newly received from a wireless communication terminal, based on the QoS resources of the entire base station managed by the QoS resource management unit, it is determined that the QoS resource allocation for the QoS setting request is not sufficient In this case, control is performed so as to release the communication channel or the QoS resource of the wireless communication terminal that is assigned QoS resources but is not performing communication using QoS among the wireless communication terminals managed by the management unit. Control means to
A communication control device comprising:   The control means allocates QoS resources from among the wireless communication terminals managed by the management means, but is higher than a predetermined threshold among wireless communication terminals that do not perform communication using QoS. The communication control apparatus according to claim 12, wherein a communication channel or a QoS resource of a radio communication terminal to which a rate is assigned is released.   When a QoS setting request is newly received from a wireless communication terminal, if it is determined that the QoS resource allocation for the QoS setting request is not sufficient, QoS resources are allocated from other wireless communication terminals. A communication control method for a communication control apparatus for controlling to release a communication channel or a QoS resource of a wireless communication terminal that is not performing communication using QoS.

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