JP2009055401A - Resources allocation device, radio communication system, resources allocation method, and resources allocation program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication system which can effectively use a device which has a shortage of resources and free resources of an adjacent device. <P>SOLUTION: A radio communication system includes a plurality of resources allocation devices (SRNC2 and TRNC3) performing an allocation control of resources required for a radio communication allocated between networks. A first resources allocation device (e.g. SRNC2) holds a resources usage rate of a second resources allocation device (TRNC3) adjacent to the first resources allocation device (2). When the first resources allocation device (2) has a shortage of resources, the first resources allocation device (2) selects a resources allocation device (3) which performs a relocation based on a resources usage rate of the second resources allocation device (3), performs relocation to the resources allocation device (3) selected, and performs relocation of the resources. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a resource allocation device, a radio communication system, a resource allocation method, and a resource allocation program, and in particular, a resource allocation device, a radio communication system, a resource allocation method, and a resource allocation suitable for a radio access network (RAN). It is about the program.

  FIG. 16 shows a radio communication system constituting a general radio access network (RAN).

  In the wireless communication system shown in FIG. 16, for example, when UE (User Equipment) is concentrated under a certain RNC (Radio Network Controller), the resources of the RNC itself are insufficient and resource exhaustion occurs. . Due to the occurrence of this resource depletion, the RNC cannot accept new calls, and the call connection rate decreases. The resource means a resource necessary for performing wireless communication.

  In addition, since current resource relocation (SRNS Relocation) control is performed only when degradation of wireless communication quality occurs or when the UE moves, the current resource relocation control is adjacent to the RNC where resource depletion has occurred. Even if a free resource exists in an adjacent RNC, it is currently impossible to effectively use the free resource of the adjacent RNC.

  For this reason, when there is an empty resource in an adjacent RNC adjacent to an RNC where resource depletion has occurred, it is necessary to develop a control method for effectively using the adjacent resource of the adjacent RNC. Become.

  In addition, as technical documents filed prior to the present invention, there is a document that discloses a technique capable of improving the efficiency of HS-PDSCH allocation code and allocated power, and improving the throughput of HS-PDSCH. (For example, refer to Patent Document 1).

  In addition, there is a document that discloses a technique for realizing optimal resource allocation of a W-CDMA base station by adaptively performing ON / OFF control of the resource relocation operation according to the resource usage status and the load status of the call processing unit. (For example, refer to Patent Document 2).

  Also disclosed is a technique for optimizing a transmission link in a cellular telecommunications network when a mobile station moves from an area controlled by a first radio network controller to an area controlled by a second radio network controller. (See, for example, Patent Document 3).

  Further, there is a document that discloses a technique related to SRNS relocation in a UMTS network (see, for example, Patent Document 4).

Further, in the UMTS system, there is a document disclosing the technology of SRNS (Serving Radio Network Sub-system) reassignment method for changing SRNC (Serving Radio Network Controller) for efficient use of radio resources (for example, (See Patent Document 5).
JP 2004-242227 A JP 2004-343593 A Japanese translation of PCT publication No. 2002-510917 Special table 2003-515998 gazette JP 2005-518135 A

  The above patent document discloses a technology related to resource allocation of base stations, resource allocation by radio quality measurement, and resource relocation. However, the resource usage rate of the adjacent RNC is maintained and the adjacent RNC is maintained. There is no description or suggestion of the necessity of selecting a neighboring RNC for relocation based on the resource usage rate.

  The present invention has been made in view of the above circumstances, and is a resource allocation device and a wireless communication system capable of effectively utilizing free resources of adjacent devices adjacent to a device having insufficient resources, which is the above-described problem. It is an object of the present invention to provide a resource allocation method and a resource allocation program.

  In order to achieve this object, the present invention has the following features.

<Resource allocation device>
The resource allocation device according to the present invention is:
A resource placement device that performs placement control of resources necessary for wireless communication,
Holding means for holding a resource usage rate of an adjacent device adjacent to the resource placement device;
Control means for selecting a neighboring device to be relocated based on a resource usage rate of the neighboring device when the resource of the resource allocating device is insufficient, performing relocation to the selected neighboring device, and rearranging the resource When,
It is characterized by having.

<Wireless communication system>
Moreover, the wireless communication system according to the present invention includes:
A wireless communication system configured by arranging a plurality of resource placement apparatuses that perform placement control of resources necessary for performing wireless communication between networks,
The first resource allocation device
Holding means for holding a resource usage rate of a second resource placement device adjacent to the first resource placement device;
When the resource of the first resource allocation device is insufficient, a resource allocation device to be relocated is selected based on the resource usage rate of the second resource allocation device, and the selected resource allocation device is relocated. Control means for relocating resources;
It is characterized by having.

<Resource allocation method>
Moreover, the resource allocation method according to the present invention includes:
A resource placement method performed by a resource placement device that performs placement control of resources necessary for wireless communication,
A holding step of holding a resource usage rate of an adjacent device adjacent to the resource placement device;
A control step of selecting a neighboring device to be relocated based on a resource usage rate of the neighboring device, performing relocation to the selected neighboring device, and rearranging resources when the resource of the resource allocating device is insufficient When,
Is performed by the resource allocation apparatus.

<Resource allocation program>
In addition, the resource allocation program according to the present invention is:
A resource allocation program to be executed by a resource allocation device that performs allocation control of resources necessary for performing wireless communication,
Holding processing for holding the resource usage rate of the adjacent device adjacent to the resource placement device;
Control processing for selecting an adjacent device to be relocated based on the resource usage rate of the adjacent device when the resource of the resource allocation device is insufficient, performing relocation to the selected adjacent device, and relocating the resource When,
Is executed by the resource allocation device.

  According to the present invention, it is possible to effectively use free resources of an adjacent device adjacent to a device having insufficient resources.

  First, an outline of the wireless communication system according to the present embodiment will be described with reference to FIGS. 1 and 5.

  As shown in FIG. 1, the wireless communication system according to the present embodiment includes a plurality of resource placement apparatuses (SRNC2: Source Radio Network Controller, TRNC3: Target Radio Network Controller) that perform placement control of resources necessary for wireless communication. This is a wireless communication system configured by arranging them between networks.

Then, as shown in FIG. 5, the first resource allocation device (for example, SRNC2) holds the resource usage rate of the second resource allocation device (TRNC3) adjacent to the first resource allocation device (SRNC2). A holding unit (corresponding to the adjacent RNC information holding unit 12);
When the resource of the first resource allocation device (SRNC2) is insufficient, the resource allocation device (TRNC3) that performs relocation is selected based on the resource usage rate of the second resource allocation device (TRNC3), and the selected And a control unit (corresponding to the call processing control unit 11) that performs relocation to the resource allocation device (TRNC3) and rearranges resources. The second resource allocation device (TRNC3) is configured in the same manner as the first resource allocation device (SRNC2).

  As a result, the wireless communication system according to the present embodiment can effectively use the free resources of the adjacent device (TRNC3) adjacent to the device (SRNC2) having insufficient resources. As a result, it is possible to effectively use the resources of the entire network. Hereinafter, the wireless communication system according to the present embodiment will be described in detail with reference to the accompanying drawings. Note that the wireless communication system in the present embodiment will be described on the assumption that the SRNS Relocation function is already installed.

<System configuration of wireless communication system>
First, the system configuration of the wireless communication system of the present embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating a system configuration example of the wireless communication system according to the present embodiment.

  The wireless communication system of this embodiment includes CN: Core Network (1), SRNC: Source Radio Network Controller (2), TRNC: Target Radio Network Controller (3), Node (4), and UE: User Equipment. (5).

  CN (1) is a part that controls location control, call control, service control, and the like, and includes MSC: Mobile Switching Center, SGSN: Serving GPRS Support Node, and the like.

  The MSC is a mobile communication switching center and performs call connection control, service control, and the like for providing a mobile communication service.

  The SGSN is a subscriber exchange in the GPRS system, and terminates layer 3 signals and performs user data compression / decompression and retransmission control with a mobile terminal.

  SRNC (2) and TRNC (3) are located between CN (1) and Node (4), and perform radio management, mobility management, call control, monitoring control, and maintenance operation management.

  UE (5) is a mobile terminal.

  Node (4) is a radio base station and controls UE (5).

  2 and 3 are diagrams showing connection configuration examples before and after performing SRNS Relocation in the wireless communication system shown in FIG. 1 described above. FIG. 2 shows a connection configuration example before performing SRNS Relocation, and FIG. 3 shows a connection configuration example after performing SRNS Relocation.

  2 and 3, SRNC (2) is a movement source before UE (5) performs SRNS Relocation. TRNC (3) is a destination after UE (5) performs SRNS Relocation. As shown in FIG. 2, the wireless communication system of the present embodiment performs the SRNS Relocation while the UE (5) is connected to the CN (1) via the SRNC (2). As shown in FIG. 3, UE (5) is connected to CN (1) via TRNC (3).

<SRNS Relocation processing>
Next, the processing operation of SRNS Relocation will be described with reference to FIG.

  First, it is assumed that UE (5) is connected to SRSN (2) to SGSN (CN) (1) (step S0).

  In the state of step S0, when UE (5) determines that the radio wave condition under TRNC (3) is better than the radio wave condition under SRNC (2) (step S1), UE (5) RRC: MEASUREMENT REPORT is transmitted to SRNC (2) (step S2).

  When SRNC (2) receives RRC: MEASUREMENT REPORT, SRNC (2) transmits RANAP: RELOCATION REQUIRED to SGSN (1) (step S3).

  When SGSN (1) receives RANAP: RELOCATION REQUIRED, SGSN (1) transmits RANAP: RELOCATION REQUEST to TRNC (3) (step S4).

  When the TRNC (3) receives RANAP: RELOCATION REQUEST, the TRNC (3) acquires the resource of the UE (5) (step S5).

  Next, TRNC (3) transmits RANAP: RELOCATION REQUEST ACKNOWLEDGE to SGSN (1) (step S6).

  When SGSN (1) receives RANAP: RELOCATION REQUEST ACKNOWLEDGE, it transmits RANAP: RELOCATION COMMAND to SRNC (2) (step S7).

  When SRNC (2) receives RANAP: RELOCATION COMMAND, it transmits RASAP: RELOCATION COMMIT to TRNC (3) (step S8).

  When TRNC (3) receives RASAP: RELOCATION COMMIT, TRNC (3) transmits RANAP: RELOCATION DETECT to SGSN (1) (step S9).

  Moreover, TRNC (3) transmits RRC: UTRAN MOBILITY INFORMATION to UE (5) (step S10).

  When receiving the RRC: UTRAN MOBILITY INFORMATION, the UE (5) transmits the RRC: UTRAN MOBILITY INFORMATION CONFIRM to the TRNC (3) (step S11).

  When TRNC (3) receives RRC: UTRAN MOBILITY INFORMATION CONFIRM, TRNC (3) transmits RANAP: RELOCATION COMPLETE to SGSN (1) (step S12).

  When SGSN (1) receives RANAP: RELOCATION COMPLETE, SGSN (1) transmits RANAP: IU RELEASE COMMAND to SRNC (2) (step S13).

  When SRNC (2) receives RANAP: IU RELEASE COMMAND, it releases the resource of UE (5) (step S14) and transmits RANAP: IU RELEASE COMPLETE to SGSN (1) (step S15).

  Thereby, UE (5) will be in the state connected to SGSN (CN) (1) from TRNC (3) (step S16).

<Internal configuration of SRNC: 2 and TRNC: 3>
Next, an example of the internal configuration of the SRNC (2) and TRNC (3) of this embodiment will be described with reference to FIG. Since the internal configurations of SRNC (2) and TRNC (3) are configured in the same manner, the internal configuration of SRNC (2) will be described in the following description.

  The SRNC (2) in this embodiment has a resource management unit (10), a call processing control unit (11), and an adjacent RNC information holding unit (12).

<Resource management unit: 10>
The resource management unit (10) manages the finite resource in the SRNC (2), and performs the capture / release processing of the finite resource in response to the resource control request from the call processing control unit (11) (FIG. Steps S5 and S14 shown in FIG. For example, when the resource management unit (10) receives a resource capture request from the call processing control unit (11), it performs a finite resource capture process and receives a resource release request from the call processing control unit (11). In addition, finite resource release processing is performed. The resource management unit (10) notifies the call processing control unit (11) of the execution result (resource capture result, resource release result) for the resource control request, or the resource usage rate of the finite resource in the SRNC (2). To the call processing control unit (11).

<Call processing control unit: 11>
The call processing control unit (11) performs call processing control in the SRNC (2), and controls connection requests from other nodes and connection requests to other nodes. Further, the call processing control unit (11) determines whether to perform SRNS Relocation based on the resource usage rate notified from the resource management unit (10).

<Adjacent RNC information holding unit: 12>
The adjacent RNC information holding unit (12) manages information of the adjacent RNC adjacent to the SRNC (2). For example, as shown in FIG. 6, “priority”, “RNC number”, “ Resource usage rate ”is retained.

The “priority” is information indicating the priority for performing SRNS Relocation, and the call processing control unit (12) performs SRNS Relocation in order from the adjacent RNC having the highest “priority”.
The “RNC number” is information for identifying an adjacent RNC.
“Resource usage rate” is information indicating the resource usage rate used by the adjacent RNC.

  Next, the data setting operation by the operator and the information collecting operation from the adjacent RNC will be described. In the following description, the processing operation in SRNC (2) will be described. For this reason, the adjacent RNC adjacent to SRNC (2) is TRNC (3).

  First, the operator sets the SRNS Relocation resource usage threshold and the target call type (packet call that is considered to be low in urgency or real-time) in SRNC (2).

  As a result, the SRNC (2) holds and manages the resource usage rate threshold for implementing SRNS Relocation and the information of the target call type (packet call), and the call processing control unit (11) Whether or not to implement SRNS Relocation is determined based on the resource usage rate threshold value for implementing SRNS Relocation and information on the target call type (packet call).

  The SRNC (2) acquires the resource usage rate of the TRNC (3) by using the RNSAP signal at the time of the handover between the RNCs to the adjacent RNC TRNC (3) and SRNS Relocation.

  As a result, the adjacent RNC information holding unit (12) of the SRNC (2) can hold the resource usage rate of the TRNC (3) that is the adjacent RNC as shown in FIG. 11) selects TRNC (3) for performing SRNS Relocation based on the resource usage rate of TRNC (3) held by the adjacent RNC information holding unit (12). The “priority” is configured so that the operator sets SRNC (2), or priority information indicating the priority of each RNC is transmitted over the network, and SRNC (2) sends the priority information. For example, there is a method in which the priority of each RNC is set based on the received priority information. Further, for example, the signal shown in FIG. 7 is applicable as the signal at the time of handover.

<Self-subjected resource capture sequence in SRNC: 2>
Next, a processing operation at the time of resource capture in SRNC (2) will be described with reference to FIG.

  In response to a call request from the UE (5) or an incoming call request from the MSC or SGSN (CN) (1), the call processing control unit (11) in the SRNC (2) sends a resource capture request to the resource management unit ( 10) (step A1).

  When the resource management unit (10) receives the resource capture request, the resource management unit (10) performs the capture process of the finite resource, transmits the resource capture result to the call processing control unit (11), and also includes the resource in the SRNC (2). The usage rate is transmitted to the call processing control unit (11) (step A2).

  When the call processing control unit (11) receives the resource capture result and the resource usage rate, based on the resource capture result, the call processing control unit (11) determines whether or not the call for which the resource capture request matches the target call type Is determined (step A3).

  When the call processing control unit (11) determines that the call for which the resource capture request is made matches the target call type (step A3 / Yes), the call processing control unit (11) receives the call from the resource management unit (10). The received resource usage rate is overwritten and saved in the call processing control unit (11) as information of the SRNC (2) itself (step A4).

  Next, the call processing control unit (11) determines whether or not the resource usage rate of the SRNC (2) itself stored in step A4 exceeds the resource usage rate threshold preset in the SRNC (2). (Step A5).

  When the call processing control unit (11) determines that the resource usage rate of the SRNC (2) itself does not exceed the resource usage rate threshold (step A5 / No), the call processing control unit (11) makes a resource capture request in the above processing. Call information is registered in the forced SRNS Relocation list as a forced SRNS Relocation implementation target call (step A6).

  For example, it is assumed that the call processing control unit (11) holds a forced SRNS Relocation list as shown in FIG. 9 and the call that has made a resource capture request is a call with UE instance ID “000a0700”. . In this case, when the call processing control unit (11) determines in step A5 that the resource usage rate of the SRNC (2) itself does not exceed the resource usage rate threshold (step A5 / No), resource capture The information of the requested call is registered in the forced SRNS Relocation list as a forced SRNS Relocation implementation target call, and the call processing control unit (11) makes a resource capture request to the forced SRNS Relocation list shown in FIG. The UE instance ID “000a0700” of the call made is registered, and the forced SRNS Relocation list as shown in FIG. 10 is held.

  Next, the call processing control unit (11) continues the new call connection processing (step A7).

  Further, when the call processing control unit (11) determines that the call for which the resource capture request has been made does not match the target call type (step A3 / No), the processing of step A4 to step A6 is not performed. The new call connection process is continued (step A7).

<Self-resource release sequence with SRNC: 2>
Next, a processing operation at the time of resource release in SRNC (2) will be described with reference to FIG.

  In response to a disconnection request from the UE (5) or a disconnection request from the MSC or SGSN (CN) (1), the call processing control unit (11) in the SRNC (2) sends a resource release request to the resource management unit (10). (Step B1).

  When the resource management unit (10) receives a resource release request, the resource management unit (10) performs a finite resource release process, transmits the resource release result to the call processing control unit (11), and also stores the resource in the SRNC (2). The usage rate is transmitted to the call processing control unit (11) (step B2).

  When the call processing control unit (11) receives the resource release result and the resource usage rate, the call processing control unit (11) determines whether or not the call that has made the resource release request matches the target call type (step B3).

  When the call processing control unit (11) determines that the call for which the resource release request has been made matches the target call type (step B3 / Yes), the call processing control unit (11) The resource usage rate received from 10) is overwritten and stored in the call processing control unit (11) as information of the SRNC (2) itself (step B4).

  Next, the call processing control unit (11) deletes the call that has made the resource release request from the forced SRNS Relocation list when the call that has made the resource release request is registered in the forced SRNS Relocation list. The forced SRNS Relocation list is left-justified (step B5).

  For example, it is assumed that the call processing control unit (11) holds a forced SRNS Relocation list as shown in FIG. 10 and that the call that has made a resource release request is a call with UE instance ID “000a0400”. . In this case, the call processing control unit (11), in step B5, if the call that made the resource release request is registered in the forced SRNS Relocation list, the call processing control unit (11) adds the call that made the resource release request from the forced SRNS Relocation list. At the same time, the forced SRNS Relocation list is left-justified, and the call processing control unit (11) deletes the UE instance ID “000a0400” of the call for which the resource release request has been made, and the forced SRNS Relocation list The forcible SRNS Relocation list as shown in FIG.

  When the call processing control unit (11) determines that the call for which the resource release request has been made does not match the target call type (step B3 / No), the call processing control unit (11) performs step B4. -The process of step B5 is not performed.

<Sequence when resource usage exceeds in SRNC: 2>
Next, the processing operation when the resource usage rate is exceeded in SRNC (2) will be described with reference to FIG.

  In response to a call request from the UE (5) or an incoming call request from the MSC or SGSN (CN) (1), the call processing control unit (11) in the SRNC (2) sends a resource capture request to the resource management unit ( 10) (step C1).

  When the resource management unit (10) receives the resource capture request, the resource management unit (10) performs the capture process of the finite resource, transmits the resource capture result to the call processing control unit (11), and also includes the resource in the SRNC (2). The usage rate is transmitted to the call processing control unit (11) (step C2).

  When the call processing control unit (11) receives the resource capture result and the resource usage rate, based on the resource capture result, the call processing control unit (11) determines whether or not the call for which the resource capture request matches the target call type Is determined (step C3).

  When the call processing control unit (11) determines that the call for which the resource capture request has been made matches the target call type (Yes in Step C3), the call processing control unit (11) starts from the resource management unit (10). The received resource usage rate is overwritten and stored in the call processing control unit (11) as information of the SRNC (2) itself (step C4).

  Next, the call processing control unit (11) determines whether or not the resource usage rate of the SRNC (2) stored in step C4 exceeds the resource usage rate threshold set in advance in the SRNC (2). (Step C5).

  When the call processing control unit (11) determines that the resource usage rate of the SRNC (2) itself exceeds the resource usage rate threshold (step C5 / Yes), the call processing control unit (11) makes a resource capture request in the above processing. Register call information as a mandatory SRNS Relocation implementation target call in the forced SRNS Relocation list, search for SRNS Relocation calls from the forced SRNS Relocation list, and enable SRNS Relocation in order from the first call in the forced SRNS Relocation list It is checked whether or not the call is made (step C6).

  When the call processing control unit (11) finds a SRNS Relocation capable call, the call processing control unit (11) performs selection of the Relocation destination (TRNC). An adjacent RNC capable of relocation is selected (step C7).

  For example, it is assumed that the call processing control unit (11) holds a forced SRNS Relocation list as shown in FIG. 9 and the call that has made a resource capture request is a call with UE instance ID “000a0700”. . In this case, when the call processing control unit (11) determines in step C5 that the resource usage rate of the SRNC (2) itself exceeds the resource usage rate threshold value (step C5 / Yes), resource capture The information of the requested call is registered in the forced SRNS Relocation list as a forced SRNS Relocation implementation target call, and the call processing control unit (11) makes a resource capture request to the forced SRNS Relocation list shown in FIG. The UE instance ID: “000a0700” of the call made is registered, and the forced SRNS Relocation list as shown in FIG. 10 is held.

  Next, the call processing control unit (11) searches for the SRNS Relocation call from the forced SRNS Relocation list shown in FIG. 10, and determines whether the call is SRNS Relocation in order from the first call in the forced SRNS Relocation list. For example, the call processing control unit (11) acquires the first UE instance ID: “000a0800” in the forced SRNS Relocation list shown in FIG. 9, and the call with the UE instance ID: “000a0800” is obtained. If the call is SRNS Relocation, the adjacent RNC that can be relocated to the call with the UE instance ID “000a0800” is extracted.

  By this processing, the call processing control unit (11) refers to the adjacent RNC information holding unit (12) and, based on the information shown in FIG. 6, determines the adjacent RNC to which the call with the UE instance ID “000a0800” is connected. Thus, the call processing control unit (11) generates the adjacent RNC list shown in FIG. Note that the SRNC (2) of the present embodiment manages the adjacent RNC to which the call of UE instance ID: registered in the forced SRNS Relocation list is connected in order to generate the adjacent RNC list shown in FIG. Become.

  As a result, the call processing control unit (11) can generate a list of adjacent RNCs to which SRNS Relocation is possible, as shown in FIG. 14, based on the adjacent RNC information shown in FIG. Become.

  Next, the call processing control unit (11) selects an adjacent RNC capable of SRNS Relocation from the adjacent RNC list shown in FIG. 14 based on the adjacent RNC list shown in FIG.

  As a method for selecting an adjacent RNC that can be SRNS Relocated, for example, there is a method of selecting an adjacent RNC whose resource usage rate is lower than a predetermined threshold. For example, when “30%” is set as the predetermined threshold, the call processing control unit (11) sets “2001” and “2003” as adjacent RNCs whose resource usage is lower than the predetermined threshold. , “2002” will be selected.

  It is assumed that the predetermined threshold is set in advance in SRNC (2). In this case, when there are a plurality of adjacent RNCs having a resource usage rate lower than a predetermined threshold, it is preferable to design the adjacent RNC having a higher priority. For example, if “2001”, “2003”, and “2002” are selected as the adjacent RNCs whose resource usage rate is lower than the predetermined threshold by the above selection, “2001” having a high priority is selected. Become.

  Thereby, the call processing control unit (11) can select the adjacent RNC according to the priority. For example, when the selection order of adjacent RNCs is set to the registration order in which RNCs are registered in SRNC (2), the registration order of newly established RNCs newly set in the radio communication system is backward, and the new RNC is selected. Probability may be low. For this reason, it is possible to improve the probability of selecting a new RNC by giving a priority as shown in FIG. 14 and selecting an adjacent RNC according to the priority.

  The predetermined threshold and priority can be configured to be set automatically or manually by manual operation.

  In addition, when there are a plurality of adjacent RNCs whose resource usage rate is lower than a predetermined threshold, it is possible to design to select an adjacent RNC having the lowest resource usage rate. For example, if “2001”, “2003”, or “2002” is selected as the adjacent RNC whose resource usage rate is lower than the predetermined threshold value by the above selection, “2002” having the lowest resource usage rate is selected. It will be. This makes it possible to select an adjacent RNC with the lowest resource usage rate.

  It is also possible to design so that the adjacent RNC with the lowest resource usage rate is selected from the beginning. Accordingly, when the adjacent RNC list shown in FIG. 14 is generated, the call processing control unit (11) selects the adjacent RNC “2002” having the lowest resource usage rate from the adjacent RNC list shown in FIG. It becomes possible.

  The call processing control unit (11) designates the adjacent RNC selected by the processing in step C7 as TRNC (3), and executes a Relocation request to the designated TRNC (3) (step C8). The process control unit (11) transmits a Relocation request: RELOCATION REQUIRED (RANAP) to the MSC or SGSN (CN) (1) (step C9).

  When the call processing control unit (11) receives a COMMIT from the MSC or SGSN (CN) (1) as a Relocation request result, the call processing control unit (11) performs SRNS Relocation by the existing SRNS Relocation function and performs resource relocation. Become. Refer to FIG. 4 for the processing sequence of the existing SRNS Relocation function.

<Sequence when receiving Relocation request result (FAILURE) at SRNC: 2>
Next, the processing operation when the Relocation request result (FAILURE) is received in SRNC (2) will be described with reference to FIG.

  When the call processing control unit (11) receives the Relocation request result (FAILURE) from the MSC or SGSN (CN) (1) (Step D1), the call processing control unit (11) deletes the information of the call that made the Relocation request from the forced SRNS Relocation list. Then, the forcible SRNS Relocation list is left-justified, and control is performed so that the call for which the Relocation request is made is continued in SRNC (2) (step D2).

  For example, it is assumed that the call processing control unit (11) holds a forced SRNS Relocation list as shown in FIG. 10 and the call that has made the Relocation request is a call with UE instance ID “000a0400”. In this case, when the call that made the Relocation request is registered in the forced SRNS Relocation list, the call processing control unit (11) deletes the call that made the Relocation request from the forced SRNS Relocation list and The call processing control unit (11) deletes the UE instance ID: “000a0400” of the call for which the Relocation request has been made, and performs the forcible SRNS Relocation list front adjustment. The forced SRNS Relocation list shown in

<Effects of the Wireless Communication System of the Present Embodiment>
As described above, the SRNC (2) configuring the wireless communication system according to the present embodiment manages the resource usage rate of the adjacent RNC (3) adjacent to the SRNC (2) as illustrated in FIG. Then, SRNC (2) searches for a SRNS Relocation capable call from the forced SRNS Relocation list as shown in FIG. 10 when the resource usage rate of SRNC (2) itself exceeds the resource usage threshold. As shown in FIG. 14, a list of adjacent RNCs to which the SRNS Relocation capable call is connected is generated. Then, the SRNC (2) selects an adjacent RNC (3) capable of SRNS Relocation from the list of adjacent RNCs shown in FIG. 14, performs Relocation to the selected adjacent RNC (3), and performs resource allocation. Relocate.

  As a result, the wireless communication system according to the present embodiment can effectively use the free resources of the adjacent RNC (3) adjacent to the SRNC (2) that lacks resources. As a result, the resources of the entire network can be effectively used, new (priority) calls can be easily accepted, and RNC performance can be improved.

  The radio communication system according to the present embodiment targets a call type (voice call or packet call) set by the operator as the RNC (2, 3), and the resource usage rate of the RNC itself / adjacent RNC (within the RNC) If a packet call is selected, the SGSN line resource usage rate / packet call control device resource usage rate) is maintained, and if the resource usage rate of the RNC itself exceeds the resource usage threshold, the SRNS Relocation is enabled. A neighboring RNC capable of SRNS Relocation is selected from the neighboring RNC list to which the call is connected, relocation to the selected neighboring RNC is performed, and resource rearrangement is performed.

  In addition, each RNC (2, 3) constituting the wireless communication system in the present embodiment collects and holds the resource usage rate of the RNC itself at the time of capturing and releasing the resources under its control.

  In addition, each RNC (2, 3) collects and holds the resource usage rate of the adjacent RNC by embedding information on the resource usage rate of the adjacent RNC in the Signal at the time of handover between the RNCs and notifying each other. It will be.

(Second Embodiment)
Next, a second embodiment will be described.

  The wireless communication system according to the second embodiment is characterized in that the resource usage rate monitoring target is a packet call.

  By setting the resource usage rate to be monitored as a packet call, it is possible to guarantee a certain free resource for the voice call and to control the emergency call (for example, a call to the police) to be always accepted. The control method in the second embodiment is performed in the same manner as in the first embodiment described above.

  The above-described embodiment is a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiment alone. Those skilled in the art will not be able to deviate from the gist of the present invention. It is possible to construct a form in which various changes are made by making corrections and substitutions.

  For example, the control operation in each control device configuring the wireless communication system in the above-described embodiment can be executed by hardware, software, or a combined configuration of both.

  In addition, when executing processing by software, a program in which a processing sequence is recorded is installed in a memory in a computer incorporated in dedicated hardware and executed, or a general-purpose capable of executing various processing It is possible to install and execute a program on a computer.

  For example, the program can be recorded in advance on a hard disk or a ROM (Read Only Memory) as a recording medium. Alternatively, the program is temporarily stored on a removable recording medium such as a floppy (registered trademark) disk, a CD-ROM (Compact Disc Read Only Memory), an MO (Magneto optical) disk, a DVD (Digital Versatile Disc), a magnetic disk, or a semiconductor memory. Or can be stored (recorded) permanently. Such a removable recording medium can be provided as so-called package software.

  The program is installed on the computer from the removable recording medium as described above, or is wirelessly transferred from the download site to the computer, or is wired to the computer via a network such as a LAN (Local Area Network) or the Internet. However, the computer can receive the transferred program and install it on a recording medium such as a built-in hard disk.

  In addition to being executed in time series in accordance with the processing operations described in the above embodiment, the processing capability of the apparatus that executes the processing, or to be executed in parallel or individually as necessary Is also possible. In addition, the wireless communication system described in the above embodiment can be constructed so as to have a logical set configuration of a plurality of devices or a configuration in which devices of each configuration exist in the same casing.

  The resource allocation device, the radio communication system, the resource allocation method, and the resource allocation program according to the present invention are applicable to a radio access network (RAN).

It is a figure which shows the system configuration example of the radio | wireless communications system of this embodiment. FIG. 2 is a diagram illustrating a connection configuration example before performing SRNS Relocation in the wireless communication system illustrated in FIG. 1. It is a figure which shows the example of a connection structure after implementing SRNS Relocation in the radio | wireless communications system shown in FIG. It is a figure for demonstrating the processing operation of SRNS Relocation. It is a figure which shows the internal structural example of SRNC (2) and TRNC (3). It is a figure which shows the example of adjacent RNC information which an adjacent RNC information holding part (12) hold | maintains. It is a figure which shows the signal example used at the time of Inter RNC Handover / SRNS Relocation. It is a sequence diagram of resource subordinate acquisition in SRNC (2). It is a figure which shows a forced SRNS Relocation list example. FIG. 10 is a diagram illustrating an example of a forced SRNS Relocation list, and illustrates a state in which UE instance ID “000a0700” is registered in the list illustrated in FIG. 9. FIG. 11 is a sequence diagram of releasing resources under its own control in SRNC (2). FIG. 11 is a diagram illustrating an example of a forced SRNS Relocation list, and illustrates a state where UE instance ID “000a0400” is deleted from the list illustrated in FIG. 10 and left-justified. It is a sequence diagram at the time of resource usage rate excess in SRNC (2). It is a figure which shows the example of a list of the adjacent RNC to which the call of UE instance ID: registered in the forced SRNS Relocation list is connected. It is a sequence diagram at the time of Relocation request result (FAILURE) reception by SRNC (2). It is a figure which shows the example of a radio | wireless communications system which comprises a general radio | wireless access network (RAN: Radio Access Network).

Explanation of symbols

1 CN: Core Network
2 SRNC: Source Radio Network Controller (resource allocation device)
3 TRNC: Target Radio Network Controller (resource allocation device)
4 Node
5 UE: User Equipment
10 Resource management unit 11 Call processing control unit 12 Adjacent RNC information holding unit

Claims (10)

A resource placement device that performs placement control of resources necessary for wireless communication,
Holding means for holding a resource usage rate of an adjacent device adjacent to the resource placement device;
Control means for selecting a neighboring device to be relocated based on a resource usage rate of the neighboring device when the resource of the resource allocating device is insufficient, performing relocation to the selected neighboring device, and rearranging the resource When,
A resource allocation device comprising: The control means includes
The resource allocation apparatus according to claim 1, wherein an adjacent apparatus having a resource usage rate of the adjacent apparatus that is equal to or less than a predetermined threshold is selected as an adjacent apparatus that performs the relocation. The holding means is
A priority is given and the resource usage rate of the neighboring device is retained,
The control means includes
3. The resource allocation device according to claim 2, wherein when there are a plurality of adjacent devices having a predetermined threshold value or less, an adjacent device having a high priority is selected as an adjacent device that performs the relocation. The control means includes
3. The resource placement apparatus according to claim 2, wherein when there are a plurality of adjacent devices having a predetermined threshold value or less, an adjacent device having the lowest resource usage rate is selected as an adjacent device that performs the relocation. The control means includes
2. The resource allocation apparatus according to claim 1, wherein an adjacent apparatus having the lowest resource usage rate of the adjacent apparatus is selected as an adjacent apparatus that performs the relocation. The control means includes
6. The resource allocation device according to claim 1, wherein a neighboring device that performs relocation is selected based on a resource usage rate of a neighboring device to which a call in a relocation enabled state is connected. The control means includes
2. The resource allocation device according to claim 1, wherein when the resource usage rate of the resource allocation device exceeds a threshold, it is determined that the resource of the resource allocation device is insufficient. A wireless communication system configured by arranging a plurality of resource placement apparatuses that perform placement control of resources necessary for performing wireless communication between networks,
The first resource allocation device
Holding means for holding a resource usage rate of a second resource placement device adjacent to the first resource placement device;
When the resource of the first resource allocation device is insufficient, a resource allocation device to be relocated is selected based on the resource usage rate of the second resource allocation device, and the selected resource allocation device is relocated. Control means for relocating resources;
A wireless communication system comprising: A resource placement method performed by a resource placement device that performs placement control of resources necessary for wireless communication,
A holding step of holding a resource usage rate of an adjacent device adjacent to the resource placement device;
A control step of selecting a neighboring device to be relocated based on a resource usage rate of the neighboring device, performing relocation to the selected neighboring device, and rearranging resources when the resource of the resource allocating device is insufficient When,
Is performed by the resource allocation apparatus. A resource allocation program to be executed by a resource allocation device that performs allocation control of resources necessary for performing wireless communication,
Holding processing for holding the resource usage rate of the adjacent device adjacent to the resource placement device;
Control processing for selecting an adjacent device to be relocated based on the resource usage rate of the adjacent device when the resource of the resource allocation device is insufficient, performing relocation to the selected adjacent device, and relocating the resource When,
Is executed by the resource allocation device.

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