JP2008311971A - Server system, load distribution method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a server system capable of readily improving the throughput. <P>SOLUTION: When a protocol termination portion 21 receives a call processing signal indicative of a calling signal, it transmits the received call processing signal to any of a plurality of call processors 30-32. Signal processing portions 40-42 request a resource management processor 60 to determine a processor which should execute the processing. A processor determining portion 62 refers to a profile variance information 61. If there is a call processor having a profile of a relevant subscriber, the processor determining portion 62 returns the processor number of the call processor. If there is no call processor having a profile of the relevant subscriber, the processor determining portion 62 returns the processor number of a call processor having the fewest profiles held. The signal processing portions 40-42 transfer the call processing signal to a call processor of the returned processor number. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a server system, and more particularly to a server system having a plurality of call processors. The present invention also relates to a load distribution method and program, and to a load distribution method and program for a call processor in a server system.

  In general, a server system used in a communication system has a plurality of call processing processors that perform call processing in one system. The call processing processor stores a subscriber profile, and the subscriber communication is performed by the call processing processor in which the subscriber profile is stored. The server system also includes a load distribution processor that distributes the load of the call processor. The load balancing processor manages which call processor stores the profile of each subscriber, and provides a function of selecting a call processor to be used for communication. Further, the load of each call processor is monitored, and a function for determining a call processor to process the call signal is provided for the call signal.

  Regarding load distribution in a server system having a plurality of processors, there are techniques described in Patent Document 1 and Patent Document 2. In Patent Document 1, when a call distribution device determines a call processing control system device (call processor) that processes a call, the call signal is a newly generated signal or a signal that has already been generated. Determine whether. In the case of a newly generated call, a call processing control system device that processes the call is dynamically determined. As a selection criterion for dynamic determination, there is a method of comparing the load of each call processing control system device and selecting the call processing control system device having the lowest load. If the call has already occurred, the call processing control system device determined at the time of call generation is statically specified.

  In Patent Document 2, a congestion state management unit that stores the congestion state of each processor is used. When a call is made from the accommodation line, the processor confirms the congestion state of each processor by the congestion state management means. When the processor is not in a congested state, the processor requests the call setup / cancel processing execution means of the processor to execute the process. When the own processor is in a congested state, one processor that is not in the congested state is selected, and execution of processing is requested to the call setting / cancellation processing execution means of the selected processor. The processor that has received this request confirms that its own processor is not in a congested state by the congestion state management means, and requests the call setup / release processing execution means in its own processor to execute processing.

JP 2000-253429 A JP-A-6-77997

  Normally, a server system has one load balancing processor for a plurality of (N: N is an integer of 2 or more) call processing processors. The load distribution processor performs transmission / reception processing of all call processing signals and creates information (distribution management information) used when determining which call processing processor to use from among a plurality of call processing processors. For this reason, if the number of call processing processors to be load-balanced is increased, it becomes a bottleneck in processing capacity due to an increase in the amount of signals, and a shortage of memory occurs due to an increase in the amount of information to be centrally managed. The number of processors cannot be easily increased. Therefore, in order to improve the processing capacity, there is a problem that it is necessary not only to increase the number of call processors, but also to improve the capacity of the load distribution processor or to introduce a new system.

  It is an object of the present invention to provide a server system, a load distribution method, and a program that can solve the above-described problems of the prior art and can easily improve the processing capability.

  In order to achieve the above object, a server system according to the present invention comprises a line termination processor for terminating a line, and a plurality of call processing processors that hold subscriber profiles and perform signal processing on call processing signals using the profiles. And a processor determination unit that determines a call processing processor to perform signal processing on the call processing signal by referring to the distribution information of the profile in the plurality of call processing processors when communication is started. It is characterized by that.

  The load distribution method of the present invention includes a line termination processor that terminates a line, a plurality of call processors that hold subscriber profiles and perform signal processing on call processing signals using the profiles, and distribution information on the profiles Load distribution method in a server system having a resource management processor for managing a call processing signal received by the line termination processor with reference to the profile distribution information when the resource management processor starts communication On the other hand, a call processor to be subjected to signal processing is determined.

  The program of the present invention manages a line termination processor that terminates a line, a plurality of call processing processors that hold subscriber profiles and perform signal processing on call processing signals using the profiles, and distribution information of the profiles A program that causes a server system having a resource management processor to execute load distribution processing, and refers to the distribution information of the profile when the server system starts communication to receive call processing received by the line termination processor A process for determining a call processor to perform signal processing on a signal is executed.

  With the server system, load distribution method, and program of the present invention, the processing load on a specific processor can be reduced, and the processing capacity of the entire server system can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the configuration of a communication apparatus according to a first embodiment of the present invention. The communication device (server system) 10 includes a line termination processor 20, a plurality of call processing processors 30 to 32, and a resource management processor 60. Each processor (20, 30 to 32, 60) is connected by a network 70. The server system 10 includes, for example, an RNC (Radio Network controller) / BSC (Base Station Controller) in 3GPP (Third Generation Partnership Project) or 3GPP2 (Third Generation Partnership Project 2), and an IMS network (IP Multimedia Subsystem) / MMD (MultiMedia). Exchange data with Domain.

  The line termination processor 20 has a protocol termination unit 21. The protocol termination unit 21 performs protocol conversion from the outside to the inside of the call processing signal and protocol conversion from the inside to the outside. Also, the call processing signal converted into the internal protocol is processed. The call processors 30 to 32 have signal processors 40 to 42 and profiles 50 to 52. The signal processing units 40 to 42 process the call processing signal converted into the internal protocol. The processing performed by the signal processing units 40 to 42 includes processing for requesting the resource management processor 60 to determine a call processing processor to perform signal processing on the call processing signal, signal processing (call processing) on the call processing signal, and the like. There is.

  Profiles 50 to 52 are subscriber data for performing call processing. The signal processing units 40 to 42 perform call processing for the corresponding subscriber based on the profile, and return a call processing signal to the line termination processor 20. Call processing is performed by a call processing processor having the profile of the subscriber. That is, if the profile of the corresponding subscriber has been created, the call processing is performed by the call processor that holds the profile of the corresponding subscriber. When the profile of the subscriber does not exist, call processing is performed after the profile is created by the signal processing units 40 to 42.

  The resource management processor 60 includes profile distribution information 61 and a processor determination unit 62. The profile distribution information 61 includes information indicating which call processing processor has which subscriber's profile. Each call processor also has information indicating how many profiles it has. When the processor determination unit 62 receives a request for determining a call processor to perform call processing from the call processors 30 to 32, the processor determination unit 62 refers to the profile distribution information 61 to determine a call processor to perform call processing. .

  When the protocol termination unit 21 receives a call processing signal from the line side, the protocol termination unit 21 determines whether the call processing signal is a call signal. If it is a call signal, a call processing signal for entrusting selection of the processing processor is transmitted to any of the call processing processors 30 to 32 in a round robin manner. The signal processing unit of the call processing processor that has received the call processing signal from the protocol termination unit 21 requests the processor determination unit 62 to determine the call processing processor to be processed. The processor determination unit 62 refers to the profile distribution information 61 to check whether the profile of the corresponding subscriber is stored in any call processing processor.

  When there is a call processing processor that holds the profile of the corresponding subscriber, the processor determination unit 62 determines the call processing processor as a call processing processor that should perform the call processing. On the other hand, when the profile of the subscriber is not stored in any of the call processors, the profile distribution information 61 is referred to and a call processor having a small profile amount is determined as a processor to perform call processing. . After determining the call processing processor, the processor determination unit 62 returns information for identifying the determined call processing processor, such as a processor number, to the requesting call processing processor.

  When receiving the information specifying the call processing processor that should perform the call processing from the processor determination unit 62, the requesting call processing processor writes the information specifying the processor that should perform the call processing in the call processing signal. The processor number written in the call processing signal is always set in both directions by a continuation signal with the line side thereafter. Thereafter, the call processor determines whether or not the call processor that should perform the call processing is its own processor. When the processor is the own processor, a call processing is performed by the signal processing unit after creating the profile of the corresponding subscriber. If it is not its own processor, the call processing signal is transferred to the call processing processor that should perform the call processing. The call processor receiving the transfer of the call processing signal creates the profile of the subscriber and executes the call processing.

  When the protocol termination unit 21 determines that the call processing signal is a continuation signal, the protocol termination unit 21 specifies information identifying the call processing processor written in the call processing signal by the call processing processor from the call processing signal, in other words, the profile of the corresponding subscriber. The information for identifying the call processor that holds The protocol termination unit 21 transfers the call processing signal (continuation signal) to the corresponding call processing processor after extracting the information specifying the call processing processor. The call processing processor that has received the transfer of the call processing signal executes the call processing based on the profile of the corresponding subscriber possessed, and returns the call processing signal to the line termination processor 20.

  FIG. 2 shows a flow of processing in the line termination processor 20. The processing performed by the line termination processor 20 can be broadly divided into two types: call processing signal reception processing from the line side and call processing signal reception processing from the call processing processor. The protocol termination unit 21 waits for reception of a call processing signal from the line side (step A1). Upon receiving the call processing signal from the line side, the protocol termination unit 21 converts the received call processing signal into an internal protocol, and determines whether or not the call processing signal is a call signal (step A2).

  When the received call processing signal is a call signal, the protocol termination unit 21 sends a call signal from the plurality of call processors 30 to 32 to transmit the call processing signal to the call processor in round robin. A call processor to be transmitted is selected (step A3). In step A3, for example, the protocol termination unit 21 extracts one processor number in a predetermined order from the stored processor numbers of the call processing processors 30 to 32 in the server system 10, and determines the processor number. The call processor is selected as the call processor that should transmit the call signal.

  When the received call processing signal is a continuation signal, the protocol termination unit 21 extracts the processor number of the call processing processor written in the call processing signal, that is, the processor number of the call processing processor that performed the previous processing (step). A4). Thereafter, a call processing signal (calling signal or continuation signal) is transmitted to the call processing processor of the processor number selected in step A3 or the call processing processor of the processor number extracted from the call processing signal in step A4 (step A5). ).

  The protocol termination unit 21 waits for reception of call processing signals from the call processing processors 30 to 32 in parallel with reception of the call processing signal from the line side in step A1 (step A6). When the protocol termination unit 21 receives a call processing signal from any of the call processors 30 to 32, the protocol termination unit 21 converts the received call processing signal into an external protocol and transmits it to the line side (step A7).

  FIG. 3 shows a processing flow of the call processor. The processes performed by the call processors 30 to 32 include a call processor determination process (load distribution process) using the resource management processor 60 and a signal process (call process) of a call signal or a continuation signal after the processor is determined. ) And two. In the following description, the operation of the signal processing unit 40 of the call processor 30 will be described. However, the operation of the signal processing units 41 and 42 in the other call processing processors 31 and 32 is the same as the operation of the signal processing unit 40. It is.

  The signal processing unit 40 waits for reception of a call processing signal from the line termination processor 20 or the other call processing processors 31 and 32 (step B1). When receiving the call processing signal, the signal processing unit 40 determines whether or not the received call processing signal is a calling signal (step B2). When determining that the signal is a call signal, the signal processing unit 40 determines whether or not the processor number (own processor number) of the call processor to be processed has been written in the call signal (step B3). .

  When the transmission source of the calling signal is the line termination processor 20, that is, the call processing processor 30 is the call processing processor selected in step A 3 in FIG. 2 and receives the calling signal from the line termination processor 20. In this case, since the call processor to be processed is not yet determined, the signal processing unit 40 determines in step B3 that its own processor number has not been written. In this case, the signal processing unit 40 requests the resource management processor 60 to determine a call processor to be processed (step B8).

  The processor determination unit 62 of the resource management processor 60 refers to the profile distribution information 61 to check whether the corresponding subscriber profile is stored in any of the call processors 30 to 32. When the processor determination unit 62 determines that the profile of the subscriber is stored in any of the call processors 30 to 32, the processor determination unit 62 selects the call processor that stores the profile of the subscriber as follows: The call processor to be processed is determined. When the profile of the subscriber is not stored in any of the call processors 30 to 32, the number of profiles held by each call processor is checked by referring to the profile distribution information 61, and the number of held profiles is The smallest call processor is determined as the call processor to be processed. Since the number of profiles each call processor has can be generated from information indicating which call processor has which subscriber's profile, the processor distribution information does not necessarily include each call processor. Information indicating how many profiles the processor has may not be included.

  The processor determination unit 62 returns the processor number of the call processor determined as the call processor to be processed to the call processor that requested the call processor determination in step B8. The signal processing unit 40 receives from the resource management processor 60 the processor number of the call processing processor determined as the call processing processor to be processed. Thereafter, the received processor number is written into a call processing signal (calling signal) (step B9). Further, it is determined whether or not the call processor determined as the call processor to perform call processing is its own processor (step B10). When the signal processor 40 determines in step B10 that the call processor to be processed is not its own processor, the signal processor 40 writes the processor number into the call processor of the processor number received from the resource management processor 60. Is transmitted (step B11).

  When the signal processing unit 40 determines that the call processor to be processed is its own processor, the signal processing unit 40 determines whether the profile 50 has the profile of the subscriber (step B4). If not, a profile for the corresponding subscriber is created and stored in the profile 50 (step B5). In creating the profile, the signal processing unit 40 extracts necessary information such as authentication information, area information, and contract status information of the subscriber from the call processing signal, and includes this in the profile. In addition, the information about the created subscriber profile is transmitted to the resource management processor 60 to update the profile distribution information 61. Thereafter, the signal processing unit 40 performs signal processing based on the profile of the corresponding subscriber (step B6), and transmits a call processing signal to the line termination processor 20 (step B7).

  When the signal processing unit 40 determines in step B3 that the own processor number is written in the call processing signal, the signal processing unit 40 proceeds to step B4 and determines whether or not the profile of the corresponding subscriber is held. Thereafter, when the profile of the subscriber is not held, the profile of the subscriber is created in step B5, signal processing is performed based on the profile in step B6, and call processing is performed on the line termination processor 20 in step B7. Send a signal.

  For example, if the resource management processor 60 determines that the call processor 31 is a call processor to be processed, the signal processor 40 of the call processor 30 sends the call processor 31 to the call processor 31 in step B11. A call processing signal in which the processor number of the processing processor 31 is written is transmitted. The signal processing unit 41 of the call processor 31 that has received this call processing signal determines in step B3 that its own processor number is written in the calling signal. Thereafter, the process proceeds to step B4, and it is determined whether or not the profile of the corresponding subscriber is held. If the signal processing unit 41 has the profile of the subscriber, the signal processing unit 41 proceeds to step B6 and performs call processing based on the stored profile. If the profile of the corresponding subscriber is not held, the signal processing unit 41 creates a profile in step B5, and performs call processing based on the created profile in step B6.

  In this embodiment, the processor determination unit 62 refers to the profile distribution information 61 when there is no call processing processor that holds the profile of the corresponding subscriber, and calls the call processing processor that has less profiles to be processed. Determine as the processor. In this embodiment, load distribution is performed based on the distribution status of profiles, and it is not necessary to monitor the load of each call processor using a load distribution processor. In this embodiment, a call processing signal is sent from the line termination processor 20 to the call processing processors 30 to 32 to cause the call processing processor to execute processing for load distribution. In this embodiment, by selecting a call processor in step A3 so that the call processing signal is transmitted in round robin, even when the number of call processors increases, the processing load on a specific processor is increased. You can avoid concentration. Therefore, even if the number of call processing processors is increased, there is no processor that becomes a processing bottleneck, the processing capacity of the server system can be easily improved, and the load distribution type server system that makes the best use of the processing capacity of the call processing processor Can be built.

  In this embodiment, after the call processor to be processed is determined, information (processor number) for specifying the call processor is written to the call processing signal. In subsequent communications, the information is written to the call processing signal. Information specifying the call processor is set in both directions. In this case, the line termination processor 20 can identify the call processing processor to which the call processing signal should be transmitted by extracting the processor number from the call processing signal (continuation signal). In this way, the line termination processor 20 can identify the call processing processor to which the call processing signal is to be transmitted without checking which call processing processor stores the profile of the corresponding subscriber, and the processing load on the continuation signal. Can be reduced and the processing capacity of the server system can be improved.

  FIG. 4 shows the configuration of the server system according to the second embodiment of the present invention. The difference from the first embodiment is that a load distribution processor 80 corresponding to the resource management processor 60 of FIG. 1 has a signal processing unit 81 including the function of the processor determination unit 62 of FIG. In the server system 10a of the present embodiment, the line termination processor 20 transmits a call signal out of call processing signals received from the line side to the load distribution processor 80. For the continuation signal among the call processing signals, the line termination processor 20 transfers the continuation signal to the call processing processor to be processed by the same processing as in the first embodiment.

  When receiving the call signal, the signal processing unit 81 of the load distribution processor 80 refers to the profile distribution information 82 to determine a call processor to be processed for the call signal. The call processor determination process is the same as the call processor determination process in the processor determination unit 62 of FIG. The profile distribution information 82 is the same as the profile distribution information 61 (FIG. 1) in the first embodiment. When the signal processing unit 81 determines a call processor to be processed, the signal processing unit 81 writes information specifying the determined call processor in the call processing signal. Thereafter, a call processing signal is transmitted to the determined call processor.

  FIG. 5 shows an operation procedure of the line termination processor 20. The procedure shown in FIG. 5 is the same as the procedure shown in FIG. 2 except that in step C3, information (processor number) for specifying the load distribution processor 80 is extracted as the call processing signal transmission destination. If the call processing signal received in step A1 is a call signal, the line termination processor 20 extracts the processor number of the load distribution processor 80 in step C3, and sends the call processing signal to the load distribution processor 80 in step A5. (Call signal) is transmitted. If the received call processing signal is a continuation signal, information specifying a call processing processor to be processed is extracted from the call processing signal in step A4 by the same operation as in the first embodiment, and step A5 is executed. Then, a continuation signal is transmitted to the call processor.

  FIG. 6 shows an operation procedure of the load distribution processor 80. The signal processing unit 81 of the load distribution processor 80 waits for reception of a call processing signal (calling signal) from the line termination processor 20 (step D1). When receiving the calling signal, the signal processing unit 81 refers to the profile distribution information 82 to determine a signal transfer destination processor, that is, a processor to perform call processing (step D2).

  In step D2, if any call processor has the profile of the subscriber, that call processor is determined as the signal transfer destination processor. When none of the call processors has a profile of the subscriber, a call processor having a small number of held profiles among the call processors 30 to 32 is determined as a signal transfer destination processor.

The signal processing unit 81 writes information for identifying the call processor determined as the signal transfer destination in step D2, for example, the processor number of the call processor, in the call processing signal (step D3). Thereafter, a call processing signal in which information for specifying the call processing processor is written in step D3 is transmitted to the call processing processor determined as the signal transfer destination in step D2 (step D4).
To do.

  FIG. 7 shows an operation procedure of the call processor. The operation procedure of the call processor of this embodiment corresponds to the operation procedure shown in FIG. 3 in which Step B3 and Steps B8 to B11 are omitted. That is, in step E1, reception of a call processing signal from the line termination processor 20 or the load distribution processor 80 is waited, and in step E2, it is determined whether or not the call processing signal is a call signal. Thereafter, similarly to the processing of steps B4 to B7 in FIG. 3, it is determined whether or not the profile is held at step E3. If not, the profile is created at step E4 and called at step E5. Processing is performed and signal transmission is performed to the line termination processor 20 in step E6.

  In the present embodiment, the load distribution processor 80 determines a call processor to be processed with respect to the call signal, and writes information specifying the determined call processor into the call process signal. For the continuation signal, the line termination processor 20 extracts information specifying the call processing processor from the call processing signal, and transmits the call processing signal to the call processing processor. In load distribution of related technology, the load distribution processor is configured to determine signal transfer destinations for all call processing signals. On the other hand, in this embodiment, the load distribution processor 80 does not need to determine (determine) the signal transfer destination for the continuation signal, and can greatly reduce the processing load of the load distribution processor. Therefore, the processing load of the load balancing processor can be reduced, the number of call processors can be increased, and the processing capacity per system can be improved.

  Although the present invention has been described based on the preferred embodiment, the server system, the load distribution method, and the program of the present invention are not limited to the above embodiment, and the configuration of the above embodiment. Various modifications and changes are also included in the scope of the present invention.

The block diagram which shows the structure of the server system of 1st Example of this invention. The flowchart which shows the operation | movement procedure of a line termination | terminus processor. The flowchart which shows the operation | movement procedure of a call processor. The block diagram which shows the structure of the server system of 2nd Example of this invention. The flowchart which shows the operation | movement procedure of the line termination | terminus processor in 2nd Example. The flowchart which shows the operation | movement procedure of a load distribution processor. The flowchart which shows the operation | movement procedure of the call processor in 2nd Example.

Explanation of symbols

10: Server system 20: Line termination processor 21: Protocol termination unit 30-32: Call processing processor 40-42: Signal processing unit 50-52: Profile 60: Resource management processor 61: Profile distribution information 62: Processor determination unit 70: Network 80: Load distribution processor 81: Signal processing unit 82: Profile distribution information

Claims (23)

In a server system having a line termination processor for terminating a line, and a plurality of call processing processors that hold subscriber profiles and perform signal processing on call processing signals using the profiles,
A server system comprising: a processor determination unit that determines a call processing processor to perform signal processing on the call processing signal by referring to distribution information of the profile in the plurality of call processing processors when communication is started .   The server system according to claim 1, wherein the processor determination unit determines a call processing processor having the smallest number of profiles held among the plurality of call processing processors as a call processing processor to perform the signal processing. .   The profile distribution information includes information indicating a correspondence relationship between a subscriber and a call processor that holds the profile of the subscriber, and the processor determination unit includes a call processor that holds the profile of the subscriber. 3. The server system according to claim 1, wherein when there is a call processor, a call processor having a profile of the subscriber is determined as a call processor to perform the signal processing.   The line termination processor transfers a call processing signal to one of the plurality of call processing processors, and the call processing processor that has received the transfer of the call processing signal performs the signal processing on the processor determination unit. The server system as described in any one of Claims 1-3 which requests determination of a call processor to be performed.   The server system according to claim 4, wherein the line termination processor transfers the call processing signal to the plurality of call processors in a round robin manner.   6. The call processing processor according to claim 4 or 5, wherein when the call processing processor to be subjected to the signal processing is determined by the processor determination unit, information specifying the determined call processing processor is written in the call processing signal. The server system described.   The call processing processor that has requested the call processing processor to perform the signal processing determines whether or not the call processing processor determined by the processor determination unit is its own processor. The server system according to claim 6, wherein the call processing signal is transmitted to a processing processor.   When the received call processing signal is a continuation signal indicating continuation of communication, the line termination processor extracts information for specifying the call processing processor from the call processing signal, and sends the call processing signal to the call processing processor. The server system according to claim 6 or 7, which transmits a signal.   When the processor determination unit determines a call processing processor to perform the signal processing, information specifying the determined call processing processor is written in the call processing signal, and the call processing signal is transferred to the determined call processing processor The server system according to any one of claims 1 to 3.   When the received call processing signal is a continuation signal indicating continuation of communication, the line termination processor extracts information for specifying the call processing processor from the call processing signal, and sends the call processing signal to the call processing processor. The server system according to claim 9 which transmits a signal. A line termination processor that terminates a line, a plurality of call processors that hold subscriber profiles and perform signal processing on call processing signals using the profiles, and a resource management processor that manages distribution information of the profiles A load balancing method in a server system having:
The resource management processor determines a call processing processor to perform signal processing on a call processing signal received by the line termination processor with reference to the distribution information of the profile at the start of communication Distribution method.   The load distribution according to claim 11, wherein the resource management processor determines a call processing processor having the smallest number of profiles held among the plurality of call processing processors as a call processing processor to perform the signal processing. Method.   The profile distribution information includes information indicating a correspondence relationship between a subscriber and a call processor that holds the profile of the subscriber, and the resource management processor is a call processor that holds the profile of the subscriber. The load distribution method according to claim 11 or 12, wherein when there is a call processor, a call processor having a profile of the subscriber is determined as a call processor to perform the signal processing. The line termination processor transfers the received call processing signal to any of the plurality of call processing processors;
The load distribution method according to any one of claims 11 to 13, wherein the call processing processor that has received the transfer of the call processing signal requests the resource management processor to determine a call processing processor to perform the signal processing. .   The load distribution method according to claim 14, wherein the line termination processor transfers the call processing signal to the plurality of call processors in a round robin manner.   When the resource management processor determines the call processing processor to be subjected to the signal processing, the call processing processor that has requested the determination of the call processing processor to be subjected to the signal processing includes information specifying the determined call processing processor, The load distribution method according to claim 14 or 15, wherein the call processing signal is written.   The call processor that requested the call processor to perform signal processing determines whether or not the call processor determined by the resource management processor is its own processor. The load distribution method according to claim 16, wherein the call processing signal is transmitted to a processing processor.   When the received call processing signal is a continuation signal indicating continuation of communication, the line termination processor extracts information for specifying the call processing processor from the call processing signal, and sends the call processing signal to the call processing processor. The load distribution method according to claim 16 or 17, wherein a signal is transmitted. The line termination processor transfers the received call processing signal to the resource management processor;
When the resource management processor determines a call processing processor to perform the signal processing, the resource management processor writes information specifying the determined call processing processor in the call processing signal, and transfers the call processing signal to the determined call processing processor The load distribution method according to any one of claims 11 to 13.   When the received call processing signal is a continuation signal indicating continuation of communication, the line termination processor extracts information for specifying the call processing processor from the call processing signal, and sends the call processing signal to the call processing processor. The load distribution method according to claim 19, wherein the signal is transmitted. A line termination processor that terminates a line, a plurality of call processors that hold subscriber profiles and perform signal processing on call processing signals using the profiles, and a resource management processor that manages distribution information of the profiles A program for causing a server system to execute load distribution processing,
A program for executing a process of determining a call processing processor to perform signal processing on a call processing signal received by the line termination processor with reference to the distribution information of the profile at the start of communication.   The determination of the call processing processor to perform the signal processing determines a call processing processor having the smallest number of profiles held among the plurality of call processing processors as a call processing processor to perform the signal processing. Item 22. The program according to Item 21.   The profile distribution information includes information indicating a correspondence relationship between the subscriber and a call processor having the subscriber profile. In determining the call processor to perform the processing, It is determined whether or not there is a call processing processor having a profile, and when there is a call processing processor having a profile of the corresponding subscriber, the call processing processor is set as a call processing processor to perform the signal processing. The program according to claim 21 or 22, wherein the program is determined.

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