JP2008072547A - Mobile radio communication system and radio controller for preferentially assigning radio resource to newly requested high priority call in convergence - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile radio communication system and a radio controller which preferentially assign radio resources to a newly requested high priority call in convergence. <P>SOLUTION: The mobile radio communication system is characterized in that the radio controller includes a call processing means for processing calls, a detection means for detecting a convergence state at which the radio resources run short, a storage means for storing the priority of calls and a radio resource assignment means for assigning the radio resources to the calls based on the priority of calls, the call processing means, when a call is newly requested in the convergence, release at least a part of the radio resources assigned to calls with the priority lower than that of the newly requested call and the radio resource assignment means assigns the newly requested call to the released radio resources. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mobile radio communication system and a radio control apparatus that preferentially allocate radio resources to a newly requested call having a high priority when there is a shortage of radio resources in the mobile radio communication system. Furthermore, the present invention relates to a mobile radio communication system, a radio control apparatus, and a mobile terminal that give a high priority to a call of the mobile terminal when the mobile terminal is located in a specific cell at the time of congestion.

  FIG. 1 schematically shows an example of the configuration of a mobile radio communication system. The mobile radio communication system shown in FIG. 1 includes mobile terminals (UE #A to UE #D) 1 to 4, cells (cell #a to cell #h) 11 to 18, base stations 21 to 24, Radio control devices (RNC-1, 2) 31, 32 and a core network (CN) 41 are included. Mobile terminals (UE # A to UE # D) 1 to 4 are mobile phones or the like. The base stations 21 to 24 perform radio communication with mobile terminals (UE # A to UE # D) 1 to 4 existing in cells (cell #a to cell #h) 11 to 18 which are geographical ranges in charge. . The mobile terminals (UE # A to UE # D) 1 to 4 can establish communication with a base station via a plurality of cells at the same time to perform communication. In the example of FIG. 1, the mobile terminal (UE # C) 3 can establish communication with the base station 23 via the cell # e15 and the cell # f16 to perform communication. Radio controllers (RNC-1, 2) 31, 32 manage radio resources allocated to calls in cells (cell #a to cell #h) 11-18 and control base stations 21-24. The core network 41 is an exchange network connected between the radio network controller (RNC-1) 31 and the radio network controller (RNC-2) 32.

  When the users of mobile terminals (UE # A to UE # D) 1 to 4 are concentrated in an event venue, for example, the use of mobile terminals (UE # A to UE # D) 1 to 4 by these multiple users There may be a congestion state where the radio resources allocated to the call are insufficient. When congested, radio resources cannot be allocated to newly requested calls, including high priority calls related to emergency situations and calls from neighboring residents, and such calls or calls are not become unable. An example of a lack of radio resources is a channelization code, which is used to identify a physical channel in the downlink.

  FIG. 2 shows an example of a state in which a call cannot be made due to a congestion state and insufficient radio resources to be allocated to a new call. As for the call priority, a smaller numerical value represents a higher priority. That is, the call of the user UE # B (priority 1) has a higher priority than the call of the user UE # A (priority 10). Moreover, both user UE # A and user UE # B shall be located in cell #a.

  The user UE # A establishes a call (low priority 10) with the radio network controller RNC in the cell #a, and enters a congestion state in which radio resources to be allocated to further calls are insufficient (S101). The user UE # B requests the radio control apparatus RNC to make an emergency call (high priority 1) in the cell #a (S102). The radio network controller RNC that has received the call request from the user UE # B searches for available radio resources (S103). However, cell #a is in a congested state, and there is no radio resource that can be allocated to user UE #B (S104). Therefore, the radio network controller RNC sends a call rejection notification to the UE #B (S105), and the call of the user UE #B fails (S106). As described above, in the conventional mobile radio communication system, when a congestion state occurs, radio resources are not preferentially assigned to newly requested high priority calls.

  Furthermore, as shown in FIG. 3, even if radio resources are released in a congested state, if another call is made at the instant when the radio resources are released, the radio that has been released by another call with the better timing. Resources may be used up. In FIG. 3, user UE # A, user UE # B, and user UE # C are located in cell #a.

  The user UE # A establishes a call (low priority 10) with the radio network controller RNC in the cell #a, and enters a congestion state in which radio resources to be allocated to further calls are insufficient (S201). The user UE # B requests the radio control apparatus RNC to make an emergency call (high priority 1) with a high priority in the cell #a (S202). The radio network controller RNC that has received a call request from the user UE # B searches for available radio resources (S203). However, cell #a is in a congested state, and there is no radio resource that can be allocated to user UE #B (S204).

  Thereafter, the radio resource occupied by the user UE # A is released, or the communication rate of the UE # A is lowered, and the radio resource becomes available (S205). The state of the radio resource changes from a busy state that is in use to an idle state that is not in use. The user UE # C issues a call request (low priority 10) with good timing before the component that performs radio resource allocation is notified that the release of the radio resource is completed (S206). When it is sent to the RNC (S207), the radio network controller RNC searches for available radio resources (S208), and allocates the radio resources that have just become available to the call of the user UE # C having a low priority (S209). ). The radio network controller RNC notifies the user UE # C that the call has been completed (S210).

  Thereafter, based on the notification that the release of the radio resource is completed, the component that performs the allocation of the radio resource searches for a radio resource that can be used for the user UE # B that has been requested to make a call ( (S211), the radio resource is occupied by the call of user UE # C that has made a call at a good timing, and there is no available radio resource (S212). Therefore, the radio network controller RNC sends a call rejection notification to the user UE # B (S213), and the call of the user UE # B fails although the priority is high (S214).

  As described above, even when radio resources become available in a congested state, the available radio resources cannot be preferentially allocated to a newly requested high priority call.

  In addition, for downlink channelization codes, a reserve code may be assigned to a radio resource in order to perform a compressed mode in which a transmission gap is provided for different frequency measurement. However, during the standby state, these radio resources cannot be allocated to other calls even though these radio resources are not used.

  FIG. 4 shows this state. In FIG. 4, SF represents the number of bits for spreading, and SF / 2 is in a state where half the number of bits SF for spreading is used. That is, the compressed mode of SF / 2 is a state in which twice as many radio resources are used as in the normal mode, in other words, in the downlink channelization code. In FIG. 4, if the call has a possession code of a, b, 2, C, and D, and C and D are set to compressed mode and are using twice as many radio resources, SF64− 6 and SF64-8 are unused, but could not be assigned to other calls. As described above, the spare radio resources in these compressed modes remain unused even in a congested state.

  In addition, when allocating radio resources to a call, the user has established one radio link with the base station via one cell or established multiple radio links with the base station via multiple cells It was not considered at all. Thus, while there are users who have established multiple radio links with the base station through both congested and non-congested cells, the base station only via the congested cell A user who establishes a radio link with a station cannot establish a radio link with a base station due to congestion.

  This is shown in FIG. User (UE # A) 1 can establish a radio link with base station 21 and base station 22 via cell # a11, cell # b12, and cell # c13, while user (UE # B) 2 can establish a radio link with the base station 22 only through the cell # c13. Here, it is assumed that the cell # c13 is in a congestion state. The user (UE # A) 1 establishes a radio link with the base station 21 via the cell # a11 and the cell # b12 that are not congested, and at the same time, wirelessly communicates with the base station 22 via the cell # c13 that is congested. A link has been established. On the other hand, the user (UE # B) 2 who can establish a radio link with the base station 22 only through the congested cell # c13 has no available radio resources due to the congestion of the cell # c13. An unestablished state sometimes occurred.

  In addition, the call priority is set for each user or service, but not assigned for each cell. Users residing near the event venue were not given higher priority than calls of other users attending the event, considering that the cell containing the event venue is the user's residence. Therefore, every time an event is held, radio resources are occupied by other users visiting the event, and users who live near the event venue cannot make or receive calls at the place of residence. .

  The present invention provides a mobile radio communication system and a radio network controller that preferentially allocate radio resources to a newly requested call having a high priority at the time of congestion when radio resources are insufficient in the mobile radio communication system. To do. Furthermore, the present invention provides a mobile radio communication system, a radio network controller, and a radio control apparatus that preferentially allocate radio resources to a call of the mobile terminal when the mobile terminal newly requesting the call is located in a specific cell at the time of congestion A mobile terminal is provided.

According to the first aspect of the invention, a mobile terminal that performs radio communication, a base station that performs radio communication with a mobile terminal in a cell, a radio control apparatus that manages radio resources allocated to calls in the cell, and radio control A mobile radio communication system comprising a core network connected between devices,
A radio control apparatus includes: a call processing unit that processes a call; a detection unit that detects a congestion state in which radio resources are insufficient; a storage unit that stores call priority; and a radio resource for a call based on the call priority Radio resource allocating means for allocating
When a call is newly requested at the time of congestion, the call processing means releases at least a part of the radio resources assigned to the call having a lower priority than the newly requested call, and the radio resource assignment means The newly requested call is allocated to the released radio resource.

  By having such a configuration, a call with a newly requested high priority is made possible by allocating a newly requested high priority call by releasing radio resources from a call with a low priority at the time of congestion. On the other hand, the problem of preferentially assigning radio resources can be solved.

According to the invention of claim 2, a mobile terminal that performs radio communication, a base station that performs radio communication with a mobile terminal in a cell, a radio control device that manages radio resources allocated to calls in the cell, and radio control A mobile radio communication system that performs multiple access using spread spectrum, comprising a core network connected between devices,
A radio control apparatus includes: a call processing unit that processes a call; a detection unit that detects a congestion state in which radio resources are insufficient; a storage unit that stores call priority; and a radio resource for a call based on the call priority Radio resource allocating means for allocating a mobile terminal, and mode setting means for setting a call with a mobile terminal to a normal mode or a compressed mode that uses a radio resource twice the normal mode,
When the call processing means requests a new call at the time of congestion, and there is a call having a lower priority than the newly requested call and set to the compressed mode, the call processing means The mode is released, and the radio resource allocating means allocates the newly requested call to the radio resource made available by releasing the compressed mode.

  By having such a configuration, a new high priority call is allocated to a radio resource that is made available by canceling the compressed mode of the low priority call at the time of congestion. It is possible to solve the problem of preferentially allocating radio resources to calls with a high priority requested in the above.

According to the invention of claim 3, a mobile terminal that performs radio communication, a base station that performs radio communication with a mobile terminal in a cell, a radio control apparatus that manages radio resources allocated to calls in the cell, and radio control A mobile radio communication system comprising a core network connected between devices,
A radio control apparatus includes: a call processing unit that processes a call; a detection unit that detects a congestion state in which radio resources are insufficient; a storage unit that stores call priority; and a radio resource for a call based on the call priority Radio resource allocating means for allocating the mobile station, and monitoring means for monitoring the number of radio links established by the mobile terminal with the base station via the cell,
The call processing means establishes a radio link with a base station via a cell having a lower priority and congestion than a newly requested call when a new call is requested at the time of congestion, and When there is a mobile terminal that establishes a radio link with a base station via a cell that is not in a congestion state, the radio link via the cell in the congestion state of the mobile terminal is released, It is characterized in that a newly requested call is allocated to a radio resource made available by releasing a radio link.

  By having such a configuration, a radio resource newly made available by releasing a radio link between a low priority call and a base station via a congested cell at the time of congestion is newly requested. By assigning a call with high priority, it is possible to solve the problem of preferentially assigning radio resources to a newly requested call with high priority.

According to the invention of claim 4, a mobile terminal that performs radio communication, a base station that performs radio communication with a mobile terminal in a cell, a radio control apparatus that manages radio resources allocated to calls in the cell, and radio control A mobile radio communication system comprising a core network connected between devices,
A wireless control device for handling a call; a specific cell designating unit for designating a specific cell for each mobile terminal so that the mobile terminal has a high priority when the mobile terminal is located in the specific cell; Storage means for storing the frequency, and radio resource allocation means for allocating radio resources to the call based on call priority,
When a call is newly requested at the time of congestion, the call processing means determines whether or not the mobile terminal that newly requested the call is located in a specific cell, and determines that the mobile terminal is located in a specific cell In some cases, a high priority is given, and the radio resource assigning means assigns radio resources based on the high priority given to the newly requested call.

  By having such a configuration, when a mobile terminal newly requesting a call is located in a specific cell at the time of congestion, the mobile terminal located in the specific cell is given priority by giving a high priority to the call. The problem of preferentially allocating radio resources to calls can be solved.

According to the invention of claim 5, based on call priority, call processing means for processing a call, detection means for detecting a congestion state in which radio resources are insufficient, storage means for storing call priority, and A radio control apparatus comprising radio resource allocating means for allocating radio resources to calls.
When a call is newly requested at the time of congestion, the call processing means releases at least a part of the radio resources assigned to the call having a lower priority than the newly requested call, and the radio resource assignment means The newly requested call is allocated to the released radio resource.

  By having such a configuration, a call with a newly requested high priority is made possible by allocating a newly requested high priority call by releasing radio resources from a call with a low priority at the time of congestion. On the other hand, the problem of preferentially assigning radio resources can be solved.

According to the invention of claim 6, call processing means for processing a call, detection means for detecting a congestion state where radio resources are insufficient, storage means for storing call priority, and call priority A radio resource allocating means for allocating radio resources to a call, and a mode setting means for setting a call with a mobile terminal to a normal mode or a compressed mode that uses a radio resource twice the normal mode. A wireless control device that performs multiple access using:
When the call processing means requests a new call at the time of congestion, and there is a call having a lower priority than the newly requested call and set to the compressed mode, the call processing means The mode is released, and the radio resource allocating means allocates the newly requested call to the radio resource made available by releasing the compressed mode.

  By having such a configuration, a new high priority call is allocated to a radio resource that is made available by canceling the compressed mode of the low priority call at the time of congestion. It is possible to solve the problem of preferentially allocating radio resources to calls with a high priority requested in the above.

According to the invention of claim 7, call processing means for processing a call, detection means for detecting a congestion state in which radio resources are insufficient, storage means for storing call priority, and call priority A radio control apparatus comprising: radio resource allocation means for allocating radio resources to calls; and monitoring means for monitoring the number of radio links established between the mobile terminal and the base station via the cell,
The call processing means establishes a radio link with a base station via a cell having a lower priority and congestion than a newly requested call when a new call is requested at the time of congestion, and When there is a mobile terminal that establishes a radio link with a base station via a cell that is not in a congestion state, the radio link via the cell in the congestion state of the mobile terminal is released, It is characterized in that a newly requested call is allocated to a radio resource made available by releasing a radio link.

  By having such a configuration, a radio resource newly made available by releasing a radio link between a low priority call and a base station via a congested cell at the time of congestion is newly requested. By assigning a call with high priority, it is possible to solve the problem of preferentially assigning radio resources to a newly requested call with high priority.

According to the invention of claim 8, call processing means for processing a call, and specific cell designating means for designating a specific cell for each mobile terminal so as to have a high priority when the mobile terminal is located in the specific cell. A radio control apparatus comprising: storage means for storing call priority; and radio resource allocation means for allocating radio resources to the call based on the call priority,
When a call is newly requested at the time of congestion, the call processing means determines whether or not the mobile terminal that newly requested the call is located in a specific cell, and determines that the mobile terminal is located in a specific cell In some cases, a high priority is given, and the radio resource assigning means assigns radio resources based on the high priority given to the newly requested call.

  By having such a configuration, when a mobile terminal newly requesting a call is located in a specific cell at the time of congestion, the mobile terminal located in the specific cell is given priority by giving a high priority to the call. The problem of preferentially allocating radio resources to calls can be solved.

According to the invention according to claim 9, by comparing the specific cell information storage means including the specific cell information designating the specific cell, the area information included in the broadcast information transmitted from the base station, and the specific cell information A mobile terminal comprising: specific cell determining means for determining whether the mobile terminal is located in a specific cell,
When it is determined that the mobile station is located in a specific cell, a high priority is given to the call.

  By having such a configuration, it is possible to solve the problem of providing a mobile terminal in which high priority is given to a call when located in a specific cell.

  Hereinafter, examples of preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 6 shows a configuration example of a radio network controller 300 used in the mobile radio communication system according to the present invention. Radio control apparatus 300 includes call processing unit 310 that processes a call, determination unit 320 that determines a target for releasing at least a part of radio resources during congestion, and radio resource management unit 330 that manages radio resources allocated to the call. With.

  The radio network controller 300 includes a detection unit 331 that detects a congestion state in which radio resources are insufficient, a storage unit 332 that stores call priority, a radio resource allocation unit 333 that allocates radio resources to calls, and a mobile terminal. Mode setting means 334 for setting the call to normal mode or compressed mode, monitoring means 335 for monitoring the number of radio links established between the mobile terminal and the base station, and high when the mobile terminal is located in a specific cell Specific cell specifying means 336 for specifying a specific cell for each mobile terminal so as to have priority is further provided.

  Next, FIG. 7 shows an example of a configuration in which a radio resource is preferentially allocated to a newly requested call with high priority during congestion in the mobile radio communication system according to the present invention.

  In the example shown in FIG. 7, as in the case of FIG. 3, user UE # A, user UE # B, and user UE # C are located in cell #a.

  Note that the table shown on the lower side of FIG. 7 is a table indicating the state of radio resources. Busy represents the state in which the radio resource is being used, reservation represents the state in which the radio resource is reserved for a newly requested call with high priority, and the table of FIG. Although not shown, idle represents that the radio resource is unused. In a conventional mobile radio communication system, radio resources are managed only in a busy state and an idle state.

  The user UE # A establishes a call (low priority 10) with the radio network controller RNC in the cell #a (S301). The call processing unit 310 of the radio network controller RNC300 receives a call request from the user UE # A, the storage unit 332 stores the call priority of the user UE # A, and the radio resource allocation unit 333 receives the user UE # A. Assign radio resources to #A call. Here, it is assumed that there is a congestion state in which radio resources allocated to further calls are insufficient. When the congestion state is detected, the detection unit 331 notifies the radio resource management unit 330 that the congestion state is present.

  The radio resource allocation state at this stage is shown as a radio resource state A on the lower side of FIG. 7 (S302). All the radio resources 1 to 4 are busy. The call assigned to the radio resource 2 is a target for releasing at least a part of the radio resource when a call with a low priority and a new high priority is made.

  User UE # B requests radio control apparatus RNC300 to make an emergency call (high priority 1) with a high priority in cell #a (S303). The call processing unit 310 receives a high priority call request from the user UE # B, and the storage unit 332 stores the call priority of the user UE # B. The radio resource allocation unit 333 searches for available radio resources to allocate to the call of the user UE # B (S304). However, cell #a is congested and there is no radio resource that can be allocated to the call of user UE #B.

  Therefore, the determination unit 320 searches for a call that is lower than the priority (priority 1) of a new call by the user UE # B stored in the storage unit 332 and that is to release radio resources. As a result, the radio resource 2 is searched (S306), and the radio resource allocation unit 333 is requested to release at least a part of the radio resource 2 allocated to the user UE #A (S307). The radio resource allocation unit 333 that has received the request releases at least a part of the radio resource 2 allocated to the user UE #A (S308). The radio resource allocation unit 333 notifies the radio resource management unit 330 that the release of the radio resource 2 has been completed (S309).

  This radio resource allocation state is shown as a radio resource state B on the lower side of FIG. 7 (S310). Radio resources 1, 3, and 4 are in a busy state, but the radio resource 2 is released and is in a reserved state. This reserved state is not simply an unused state, but is a state of radio resources reserved for a call of a user UE # B that has made a new call with a high priority.

  Immediately thereafter, the user UE # C sends a call request (low priority 10) to the radio network controller RNC300 (S311). The call processing unit 310 receives a call request from the user UE # C, the storage unit 332 stores the call priority of the user UE # C, and the radio resource allocation unit 333 searches for available radio resources. (S312). However, cell #a is congested and there is no radio resource that can be allocated to user UE #C (S313). The call processing unit 310 does not release the radio resources of the existing call because the priority of the call of the user UE # C that is newly called and stored in the storage unit 332 is low, and the user UE # C Is notified of the call rejection (S314). As described above, the radio resource 2 released from the call of the user UE # A is not allocated to a call with a low priority of the user UE # C that has made a call in a timely manner.

  The radio resource management unit 330 notified of the completion of the release of the radio resource 2 causes the radio resource allocation unit 333 to search for a usable radio resource again (S315). As a result, the radio resource 2 is searched (S316), and the radio resource 2 in the reserved state is allocated to the high priority call newly requested by the user UE # B, and the call is completed. Is notified to the user UE # B (S317). As a result, the call of the user UE # B is successful (S318).

  This radio resource allocation state is shown as a radio resource state C on the lower side of FIG. 7 (S319). Since the radio resource 2 is allocated to the user UE # B, all the radio resources 1 to 4 are busy.

  As described above, radio resources can be preferentially assigned to a newly requested high priority call during congestion.

  FIG. 8 is a flowchart for searching for a reserved radio resource performed in S312 in FIG.

  When the search for the reserved radio resource is started (S401), first, the radio resource in the idle state and the reserved state is searched from the table shown in the lower side of FIG. 7 for managing the radio resource state (S402). As a result (S403), if the idle and reserved radio resources are not searched, the search for the radio resources fails (S404). On the other hand, if the idle and reserved radio resources are searched, the state of the searched radio resources is determined (S405). As a result (S406), if the radio resource is in an unused idle state, the search for the radio resource is successful (S407). On the other hand, if it is in the reserved state, it is determined whether or not the target new call has a priority to which the radio resource in the reserved state should be allocated (S408). As a result (S409), if there is no priority to which the reserved radio resource is allocated, the search for the radio resource fails (S410) (during congestion). On the other hand, if there is a priority to which the reserved radio resource should be allocated, the search for the radio resource is successful (S411).

  Next, FIG. 9 shows an example of another configuration in which radio resources are preferentially allocated to a newly requested call having a high priority during congestion according to the mobile radio communication system according to the present invention. FIG. 9 illustrates a case where a call with a mobile terminal is set in a normal mode or a compressed mode that uses twice as many radio resources as a normal mode in a mobile radio communication system that performs multiple access using spread spectrum. An example of a configuration in which radio resources are preferentially assigned to a newly requested call having a high priority at the time of congestion will be described.

  In FIG. 9, for a call (SF / 2) set in the compressed mode, a transmission gap is provided for different frequency measurement regarding the downlink channelization code, and a spare code is allocated to the radio resource. It has been. SF represents the number of bits of spreading. The lower table in FIG. 9 represents the communication state of the user. The setting of the compressed mode or the normal mode is performed by the mode setting unit 334 of the wireless control device 300.

  In the state 9-1 in FIG. 9, the users UE # 1 to UE # 4 are set as follows. That is, the user UE # 1 holds the code a for the call of priority 5 in the normal mode with the spreading bit number SF, and the user UE # 2 has the priority in the normal mode with the spreading bit number SF. Holds code b for 5 calls. User UE # 3 holds code 2 for a call of priority 5 in the normal mode with spreading bit number SF. User UE # 4 holds code B for a call of priority 5 in the normal mode with spreading bit number SF. On the other hand, the user UE # 5 holds the code Y for the call with the priority 10 in the compressed mode in which the spreading bit number SF / 2. That is, the user UE # 5 uses twice as many radio resources for the call from the user UE # 1 to the UE # 4 set in the normal mode. Here, when the state 9-1 in FIG. 9 is in a congested state and there is a new call with a high priority, the user UE # 5 calls the mode change in which the compressed mode is released. It becomes a target.

  The state of 9-2 in FIG. 9 is that when there is a new call with high priority at the time of congestion, the compressed mode for the call of the user UE # 5 is canceled and the normal mode is set. The call holding code is changed from Y to C, and the code D is available. Since the compressed mode is canceled and the normal mode is set for the call of the user UE # 5, the number of spreading bits is changed from SF / 2 to SF.

  The state of 9-3 in FIG. 9 is a state where a call of a new user UE # 6 is assigned to the code D that has become available. User UE # 6 holds code D for a call with priority 1 in the normal mode with spreading bit number SF.

  The above operation is performed as follows. The call processing unit 310 of the radio network controller 300 receives a request for a new call with high priority (priority 1) from the user UE # 6, and the storage unit 332 stores the call priority of the user UE # 6. Then, the detection unit 331 detects the congestion state. The determination unit 320 searches for a call whose mode is to be changed. That is, the user UE # 6 is searched for a call of the user UE # 5 that has a lower priority than the priority of the new call and is set to the compressed mode. The mode setting means 334 cancels the compressed mode set for the searched user UE # 5. The radio resource allocation unit 333 allocates the call of the user UE # 6 to the radio resource that has become available after the compressed mode is released.

  In this way, when a congestion state is detected, if there is a mobile terminal that has a lower priority than the newly requested call and the call is set to compressed mode, the call of this mobile terminal By releasing the compressed mode and assigning the newly requested call to the radio resource made available by releasing the compressed mode, the radio for newly requested calls with high priority during congestion Prioritize resources.

  Next, FIG. 10 shows an example of still another configuration in which radio resources are preferentially allocated to a newly requested call having a high priority during congestion according to the mobile radio communication system according to the present invention. The lower table in FIG. 10 shows the number of radio links (RL) established between the user and the base station via the cell in each cell #a and cell #b, and the number of user calls. Represents priority. The number of radio links (RL) established between the mobile terminal and the base station via the cell is monitored by the monitoring unit 335 of the radio network controller 300, and the monitoring result is reported to the radio resource management unit 330.

  The user UE # A establishes a call (low priority 5) with the radio network controller RNC via the cell #a (S501). The call processing unit 310 of the radio network controller RNC300 receives a call request from the user UE # A, the storage unit 332 stores the call priority of the user UE # A, and the radio resource allocation unit 333 receives the user UE # A. The radio resource of cell #a is allocated to the call of #A.

  This radio resource allocation state is shown as a radio resource state A on the lower side of FIG. 10 (S502). In cell #a, the call of user UE # A establishes a radio link only with cell #a (the number of radio links is 1), the priority is 5, and the call of user UE # D is also sent to cell #a. Only the radio link is established (the number of radio links is 1), the priority is 5, and the call of the user UE # E is also established only with the cell #a (the number of radio links is 1). Is 3. On the other hand, in the cell #b, the call of the user UE # C establishes a radio link only with the cell #b (the number of radio links is 1), and the priority is 5.

  Next, the user UE # A moves to enter a state in which wireless communication is possible with both the cell #a and the cell #b, and soft handover (SHO) is performed (S503).

  This radio resource allocation state is shown as a radio resource state B on the lower side of FIG. 10 (S504). In the cell #a, the call of the user UE # A has a radio link with the cell #b, so the number of radio links is two. Furthermore, in cell #b, since the call of user UE # A has established a radio link, user UE # A is added and the number of radio links is two.

  Here, the user UE # B requests the radio control apparatus RNC300 to make an emergency call (high priority 1) with high priority in the cell #b (S505). The call processing unit 310 receives a call request from the user UE # B, and the storage unit 332 stores the call priority of the user UE # B. The radio resource management unit 330 searches for available radio resources for the call of the user UE # B (S506). However, in the cell #b, radio resources are allocated to the calls of the user UE # A and the user UE # C, and it is congested and the search for available radio resources fails (S507).

  The determination unit 320 determines whether or not there is a mobile terminal that has a lower priority than a newly requested call from the user UE #B (priority 1) and has established a radio link through a plurality of cells. User A who has established a radio link (number of radio links 2) via cell #a and cell #b is searched. The call processing unit 310 requests the radio resource assignment unit 333 to release the radio link assigned to the call of the user UE #A in the cell #b (S508). The radio resource allocation unit 333 releases the radio link allocated to the call of the user UE #A in the cell #b (S509), and notifies the call processing unit 310 that the release has been completed (S510).

  This radio resource allocation state is shown as a radio resource state C on the lower side of FIG. 10 (S511). Since the radio link between the cell #b and the call of the user UE # A is released, the user UE # A is deleted from the cell #b, and the radio resource becomes available in the cell #b. On the other hand, in the cell #a, since the call of the user UE #A has established a radio link only with the cell #a, the number of radio links is 1.

  Next, the call processing unit 310 notified of the completion of the release of the radio link causes the radio resource allocation unit 333 to search for available radio resources (S512). The radio resource allocation unit 333 searches for radio resources released in the cell #b and allocates them to the user UE #B (S514). The radio network controller 300 notifies the user UE # B that the call has been completed (S514). As a result, the call of the user UE # B is successful (S516).

  This radio resource allocation state is shown as a radio resource state D on the lower side of FIG. 10 (S515). In the cell #b, a radio resource is allocated to a call with a high priority (priority 1) newly originated from the user UE #B. On the other hand, the call (priority 5) of the user UE # A having a low priority is returned from the soft handover state to the state where the radio link is established only with the cell #a.

  In this way, when a congestion state is detected, a radio link is established between a base station in a plurality of cells having a lower priority than a newly requested call and including a cell in a congestion state and a cell not in a congestion state. If there is a mobile terminal that establishes a radio link with a base station in a cell in a congestion state of this mobile terminal, and a newly requested call is allocated to the released radio link, Radio resources can be preferentially allocated to a newly requested call having a high priority during congestion.

  Next, FIG. 11 shows an example of a configuration in which a high priority is given to a call of a mobile terminal when the mobile terminal is located in a specific cell during congestion according to the mobile radio communication system according to the present invention. FIG. 11 shows a processing flow in which when a user is located in a specific cell, the call priority of the user is replaced with a special priority which is a high priority.

  The lower table in FIG. 11 is a user priority management table. This user priority management table is a special priority which is a high priority assigned to a user's call when the user's mobile terminal is located in a specific cell specified by the specific cell specifying means 336 of the radio network controller 300. Degrees. This specific cell can correspond to the place where the user lives, for example.

  In cell #a, special priority 2 is given to user UE # A and user UE # C, and special priority 3 is given to user UE # B. In the cell #b, the special priority 2 is given to the user UE # L and the user UE # N, and the special priority 3 is given to the user UE # M. In the cell #c, the special priority 2 is given to the user UE # X, and the special priority 3 is given to the user UE # Y and the user UE # Z.

  The call processing unit 310 determines whether or not the mobile terminal that newly requested the call is located in a specific cell specified by the specific cell specifying unit 336 when a new call is requested at the time of congestion, If it is determined that the mobile terminal is located in a specific cell, the call is replaced with a high special priority for the mobile terminal.

  When the replacement process to the special priority is started (S601), the call processing unit 310 searches for a corresponding cell from the user priority management table of the specific cell designating unit 336 (S602). As a result of the search (S603), when there is no corresponding cell, the replacement process with the special priority is terminated (S604). On the other hand, if there is a corresponding cell, the corresponding user is searched from the user priority management table (S605). As a result of the search (S606), if there is no corresponding user, the replacement process with the special priority is terminated (S607). On the other hand, if there is a corresponding user, the special priority in the user priority management table is set as the priority of the call of the user who requested the call (S608). Thus, the replacement process with the special priority is completed (S609).

  As described above, when the mobile terminal is located in the specific cell, when the radio resource is allocated to the call by the radio resource allocation means 333 based on the high priority, the user of the mobile terminal is located in the specific cell. In addition, radio resources can be preferentially allocated during congestion.

  FIG. 12 shows another configuration example in which when a user is located in a specific cell, the call priority of the user is replaced with a special priority that is a high priority.

  The mobile terminal 1 shown on the lower side of FIG. 12 includes a specific cell information storage unit 101 and a specific cell determination unit 102. The specific cell information storage unit 101 includes specific cell information for designating a specific cell, and the specific cell determination unit 102 compares the area information included in the broadcast information transmitted from the base station with the specific cell information. It is determined whether the mobile terminal is located in a specific cell. These means can be provided in the subscriber identification module card (SIM card) of the user's mobile terminal 1.

  It is assumed that the specific cell of user UE # A is cell #a. When the user UE #A makes a call in the cell #a, the specific cell determination unit 102 of the user terminal of the user UE #A includes the specific cell information stored in the specific cell information storage unit 101 of the SIM card, and a notification By comparing the information with the area information (S701), it is determined whether or not the current user UE #A is located in the specific cell #a (S702). When it is determined that the user UE # A is located in the specific cell #a, the user UE # A issues a call request to the radio control apparatus 300 as a high priority call (S703). The radio network controller 300 that has received the call request allocates available radio resources to the user UE # A requested to make a call based on the high priority (S704). The radio network controller 300 notifies the user UE # A of the call completion (S705), and the call is successful (S706). Note that when it is determined that the user UE # A is not located in the specific cell #a, a call request is made to the radio network controller 300 with a normal priority.

  In this way, when a user of a mobile terminal is located in a specific cell, radio resources can be allocated based on a high priority during congestion.

  As described above, according to the present invention, a mobile radio communication system and a radio control apparatus that preferentially allocate radio resources to a newly requested call having a high priority in a congestion state where radio resources are insufficient. Can be provided. Further, according to the present invention, when a mobile terminal newly requesting a call is located in a specific cell at the time of congestion, a mobile radio communication system, a radio control apparatus, and a radio resource that preferentially allocate radio resources to the call of the mobile terminal, A mobile terminal can be provided.

  In addition, this invention is not limited to the specific embodiment described in this specification, A various change or correction is possible.

It is a figure which shows typically an example of a structure of a mobile radio | wireless communications system. It is a figure which shows the example of the state which becomes a congestion state and the radio | wireless resource allocated to a new call is insufficient, and cannot make a call. It is a figure which shows a mode that another call originates with the timing at the moment when the radio | wireless resource of a call is released, and the released radio | wireless resource is used. It is a figure which shows the state from which the code allocated to the compressed mode as a spare is not allocated to another call. For users who establish radio links with a base station via a cell that is not in a congested state and allocate radio resources for the congested cell and establish a radio link with the base station only through a congested cell FIG. 3 is a diagram showing a state where radio resources are not allocated. It is a figure which shows the structural example of the radio | wireless control apparatus used with the mobile radio | wireless communications system by this invention. It is a figure which shows the example of the structure which preferentially allocates a radio | wireless resource with respect to the newly requested | required call with a high priority at the time of congestion according to the mobile radio | wireless communications system by this invention. It is a figure which shows the flowchart which searches the radio | wireless resource of a reservation state. It is a figure which shows the example of the other structure which preferentially allocates a radio | wireless resource with respect to the newly requested | required call with a high priority at the time of congestion according to the mobile radio | wireless communications system by this invention. It is a figure which shows the example of the further another structure which preferentially allocates a radio | wireless resource with respect to the newly requested | required call with a high priority at the time of congestion according to the mobile radio | wireless communications system by this invention. It is a figure which shows the example of a structure which gives a high priority to the call of the said mobile terminal, when a mobile terminal is located in a specific cell at the time of congestion according to the mobile radio communication system by this invention. It is a figure which shows another structural example which replaces the priority of a user's call with the special priority which is a high priority, when a user is located in a specific cell.

Explanation of symbols

1, 2, 3, 4 Mobile terminal 11, 12, 13, 14, 15, 16, 17, 18 Cell 21, 22, 23, 24 Base station 31, 32 Radio control device 41 Core network 101 Specific cell information storage means 102 Specific cell determination means 300 Radio controller RNC
310 call processing unit 320 determination unit 330 radio resource management unit 331 detection unit 332 storage unit 333 radio resource allocation unit 334 mode setting unit 335 monitoring unit 336 specific cell designation unit

Claims (9)

A mobile terminal that performs radio communication, a base station that performs radio communication with a mobile terminal in a cell, a radio controller that manages radio resources allocated to calls in the cell, and a core network that is connected between the radio controllers A mobile radio communication system comprising:
The wireless control device
Call processing means for processing calls;
Detection means for detecting a congestion state in which radio resources are insufficient;
Storage means for storing the priority of the call;
Radio resource allocating means for allocating radio resources to calls based on call priority,
When a call is newly requested at the time of congestion, the call processing means releases at least a part of the radio resources assigned to the call having a lower priority than the newly requested call, and the radio resource assignment means A mobile radio communication system, wherein a newly requested call is allocated to a released radio resource. A mobile terminal that performs radio communication, a base station that performs radio communication with a mobile terminal in a cell, a radio controller that manages radio resources allocated to calls in the cell, and a core network that is connected between the radio controllers A mobile radio communication system that performs multiple access using spread spectrum,
The wireless control device
Call processing means for processing calls;
Detection means for detecting a congestion state in which radio resources are insufficient;
Storage means for storing the priority of the call;
Radio resource allocation means for allocating radio resources to calls based on call priority;
Mode setting means for setting a call with a mobile terminal to a normal mode or a compressed mode that uses radio resources twice as much as a normal mode;
When the call processing means requests a new call at the time of congestion, and there is a call having a lower priority than the newly requested call and set to the compressed mode, the call processing means A mobile radio communication system, characterized in that the mode is released, and the radio resource allocating means allocates the newly requested call to the radio resource made available by releasing the compressed mode. A mobile terminal that performs radio communication, a base station that performs radio communication with a mobile terminal in a cell, a radio controller that manages radio resources allocated to calls in the cell, and a core network that is connected between the radio controllers A mobile radio communication system comprising:
The wireless control device
Call processing means for processing calls;
Detection means for detecting a congestion state in which radio resources are insufficient;
Storage means for storing the priority of the call;
Radio resource allocation means for allocating radio resources to calls based on call priority;
Monitoring means for monitoring the number of radio links established between the mobile terminal and the base station via the cell,
When the call processing means establishes a radio link with the base station via a cell having a lower priority and congestion than the newly requested call when a new call is requested at the time of congestion, When there is a mobile terminal that establishes a radio link with a base station via a cell that is not in a congestion state, the radio link via the cell in the congestion state of the mobile terminal is released, A mobile radio communication system, wherein a newly requested call is allocated to a radio resource made available by releasing a radio link. A mobile terminal that performs radio communication, a base station that performs radio communication with a mobile terminal in a cell, a radio controller that manages radio resources allocated to calls in the cell, and a core network that is connected between the radio controllers A mobile radio communication system comprising:
The wireless control device
Call processing means for processing calls;
Specific cell designating means for designating a specific cell for each mobile terminal so that the mobile terminal has a high priority when located in the specific cell;
Storage means for storing the priority of the call;
Radio resource allocating means for allocating radio resources to calls based on call priority,
When a call is newly requested at the time of congestion, the call processing means determines whether or not the mobile terminal that newly requested the call is located in a specific cell, and determines that the mobile terminal is located in a specific cell A mobile radio communication system characterized in that a high priority is assigned in some cases, and the radio resource allocation means allocates radio resources based on the high priority given to a newly requested call. Call processing means for processing calls;
Detection means for detecting a congestion state in which radio resources are insufficient;
Storage means for storing the priority of the call;
A radio control apparatus comprising radio resource allocating means for allocating radio resources to a call based on call priority,
When a call is newly requested at the time of congestion, the call processing means releases at least a part of the radio resources assigned to the call having a lower priority than the newly requested call, and the radio resource assignment means A radio control apparatus, wherein a newly requested call is allocated to a released radio resource. Call processing means for processing calls;
Detection means for detecting a congestion state in which radio resources are insufficient;
Storage means for storing the priority of the call;
Radio resource allocation means for allocating radio resources to calls based on call priority;
A radio control apparatus for performing multiple access using spread spectrum, comprising mode setting means for setting a call with a mobile terminal to a normal mode or a compressed mode that uses radio resources twice as much as a normal mode,
When the call processing means requests a new call at the time of congestion, and there is a call having a lower priority than the newly requested call and set to the compressed mode, the call processing means A radio control apparatus, characterized in that the mode is released, and the radio resource allocating means allocates the newly requested call to the radio resource made available by releasing the compressed mode. Call processing means for processing calls;
Detection means for detecting a congestion state in which radio resources are insufficient;
Storage means for storing the priority of the call;
Radio resource allocation means for allocating radio resources to a call based on call priority;
A radio control apparatus comprising: monitoring means for monitoring the number of radio links established between a mobile terminal and a base station via a cell;
When the call processing means establishes a radio link with the base station via a cell having a lower priority and congestion than the newly requested call when a new call is requested at the time of congestion, When there is a mobile terminal that has established a radio link with a base station via a cell that is not in a congestion state, the radio link via the cell in the congestion state of the mobile terminal is released, A radio control apparatus, wherein a newly requested call is assigned to a radio resource made available by releasing a radio link. Call processing means for processing calls;
Specific cell designating means for designating a specific cell for each mobile terminal so that the mobile terminal has a high priority when located in the specific cell;
Storage means for storing the priority of the call;
A radio control apparatus comprising radio resource allocating means for allocating radio resources to a call based on call priority,
When a call is newly requested at the time of congestion, the call processing means determines whether or not the mobile terminal that newly requested the call is located in a specific cell, and determines that the mobile terminal is located in a specific cell A radio control apparatus characterized by giving a high priority in some cases, and the radio resource allocating means allocates radio resources based on the high priority given to a newly requested call. Specific cell information storage means including specific cell information for specifying a specific cell;
A mobile terminal comprising specific cell determination means for determining whether or not the mobile terminal is located in a specific cell by comparing area information included in broadcast information sent from a base station with specific cell information. ,
A mobile terminal characterized in that a high priority is given to a call when it is determined that it is located in a specific cell.

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