JP3276885B2 - Traffic control system for mobile communication - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic control system for mobile communication suitable for preventing a call loss due to congestion of a home memory and maximizing the number of completed mobile communication calls.

[0002]

2. Description of the Related Art A mobile communication network includes a radio base station that communicates with a mobile station, a mobile communication switching station that communicates with a plurality of radio base stations, and a home memory that manages location information of each mobile station. Consists of nodes. Then, mobile communication is performed by the cooperation of the nodes.

Generally, when an accident or disaster occurs, or a large event or ticket is released, the number of calls generated in a specific area increases abnormally. In mobile communication, since it is necessary to specify the position of the other party, each time a mobile communication call is generated, the mobile communication switch is
The home memory is referenced based on the terminal number of the other party.
Therefore, when a call occurs abnormally, traffic concentrates on the home memory. In this case, since the processing capacity of the home memory has a certain limit, congestion is likely to occur there. In such a case, the mobile communication call is regulated so that the entire mobile communication network is not disrupted. Further, when the number of occurrences of calls returns to the normal state, the restriction is released.

[0004]

The home memory detects the traffic of its own node, detects congestion when the traffic volume exceeds the processing capacity, and transfers the detection result to the traffic control device. Each exchange individually detects the traffic of its own node and transfers the detection result to the traffic control device. Upon receiving a report indicating that congestion has been detected from the home memory, the traffic control device determines an exchange to be regulated based on traffic information from each exchange, and issues a regulation instruction to the exchange. For this reason, the regulation instruction has been issued for each exchange.

[0005] In this case, a call from the radio base station to the congested home memory is once connected to an exchange, and the call is regulated by the exchange. Therefore, there is a problem that an invalid call is communicated between the wireless base station and the exchange.

[0006] Further, since the regulation unit is an exchange, there is a problem that even if there is a variation in traffic among the radio base stations connected to the exchange to be regulated, each radio base station is uniformly regulated. there were.

It is known that traffic fluctuations have a certain regularity. However, since the regulation unit is performed for each exchange, seasonal fluctuations, weekly fluctuations and time fluctuations are applied to each radio base station. However, there is a problem that the regulation control that predicts the situation cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a mobile communication system that reduces a call loss caused by congestion in a home memory and maximizes the number of completed calls in a mobile communication call. It is intended to be.

[0009]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, there are provided a plurality of mobile units for generating a call, position information indicating the positions of the mobile units, and communication therefor. A plurality of home memories for storing communication information indicating a situation, a plurality of radio base stations having communication means for communicating with the mobile device, and a restriction means for restricting a call from the mobile device; A mobile communication switch that accesses the home memory in response to a call from a base station and processes the call, a congestion detection unit that detects congestion in each of the home memories, and based on a detection result of the congestion detection unit. Traffic having a regulation ground determining means for determining the radio base station to be regulated, and regulation instruction means for giving a regulation instruction to the radio base station regulated by the regulation ground determination means Characterized in that a control device.

[0010] In the invention according to claim 2,
A plurality of mobile devices for generating a call, a plurality of home memories for storing position information indicating a position of the mobile device and communication information indicating a communication status thereof, a communication unit for performing communication between the mobile device, and A plurality of radio base stations having a restriction means for restricting a call from a mobile device; a call processing means for accessing the home memory in response to a call from the radio base station to process the call; and When processing the home memory, the number of times of access to the home memory is measured for each home memory, and traffic measurement means for generating traffic information, and the restriction amount instructed when a restriction instruction is given to each of the radio base stations. A mobile communication exchange having a regulated amount distributing means for distributing, a congestion detecting means for detecting congestion in each of the home memories based on the traffic information, and a detection result of the congestion detecting means A traffic control device having a regulation ground determining means for determining a regulation ground based on the traffic information, and a regulation instruction means for instructing the mobile communication exchange set as a regulation ground by the regulation ground determination means with the regulation amount. It is characterized by the following. The invention according to claim 3 is characterized in that the restricted amount distribution means distributes the restricted amount evenly to each of the radio base stations.

Further, in the invention according to claim 4,
A plurality of mobile devices for generating a call, a plurality of home memories for storing position information indicating a position of the mobile device and communication information indicating a communication status thereof, a communication unit for performing communication between the mobile device, and A plurality of radio base stations having a restriction means for restricting a call from a mobile device; a call processing means for accessing the home memory in response to a call from the radio base station to process the call; and A mobile communication exchange having a traffic measuring means for generating traffic information by measuring the number of accesses to the home memory for each of the home memories when processing the home memory, and determining the congestion of each of the home memories based on the traffic information. A congestion detection means for detecting, a regulation ground determination means for determining a regulation ground based on a detection result of the congestion detection means, and an access point instructed by the traffic information. A traffic control device having a restriction amount calculating unit that calculates the restriction amount of each of the wireless base stations according to the number of traffic, and a restriction instruction unit that indicates a telephone number band to be restricted. I do. Claim 5
In the invention described in (1), the traffic measuring means is provided in each of the radio base stations instead of providing the traffic measuring means in the mobile communication exchange.

Further, in the invention according to claim 6,
The congestion detection means of the traffic control device, a storage means for storing the traffic information of the past, a prediction means for predicting the number of times of access based on the traffic information stored in the storage means, Calculating means for calculating the number of future accesses based on the actual number of accesses, and determining means for determining whether or not the number of future accesses exceeds the processing capability of the home memory; Congestion is detected when it is determined that the future access count exceeds the processing capacity of the home memory.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

A. First Embodiment 1. First Embodiment Configuration of First Embodiment 1-1: Overall Configuration of System FIG. 1 is a block diagram of a mobile communication system according to a first embodiment of the present invention. In the figure, MS is a mobile device, and is constituted by a so-called mobile phone or car phone.
The BS is a radio base station and communicates with a plurality of mobile stations MS within a predetermined area. The MSC is a mobile communication exchange, and is connected to a plurality of radio base stations BS. Each mobile communication switching system MSC is connected to a radio base station B.
It communicates with the mobile station MS via S. At this time, when the mobile communication exchange MSC receives the call from the mobile station MS, it performs routine control and specifies a communication path.

Although not particularly shown in this figure, the mobile communication system is provided with a relay mobile communication exchange MSC-T, and is connected to a plurality of mobile communication exchanges MSC via communication lines. In addition, the relay mobile communication exchange MSC
-T collectively connects the communication lines collected from each radio base station BS via the mobile communication switching system MSC to connect to another relay mobile communication switching system MSC-T. Further, a communication line from a fixed network or another company's network is connected to the relay mobile communication switch MSC-T, and communication can be performed between these.

By the way, in the mobile communication, the mobile station M
S moves between the radio base stations BS, but cannot receive a call if the position of the mobile device MS is unknown at the time of reception at the mobile device MS. For this reason, each time the mobile station MS moves in each area, it is necessary to register the position in the network. This is called location registration. This location registration signal is transmitted to the radio base station BS,
It is stored in the home memory HM via the mobile communication switching system MSC. In this case, the home memory HM performs location registration in association with the telephone number of each mobile device MS. Although FIG. 1 shows one home memory HM for convenience of illustration,
The communication network according to the present embodiment includes a plurality of home memories HM.
, And manages the subscriber information of each mobile station MS for each telephone number band.

Next, TCE is a traffic control device, which is connected to each mobile communication switching system MSC.
It is also connected to the home memory HM. Then, the traffic of each node can be detected via the control line. Thereby, the traffic control device TCE can comprehensively grasp the traffic of the communication network which fluctuates dynamically. Then, based on the detected traffic of each node, the traffic control device TCE specifies a node that contributes to the prevention of communication network confusion, and issues a regulation instruction to the node. Hereinafter, each component will be described in detail.

1-2: Home Memory The home memory HM is composed of a general-purpose computer or the like, in which a large-capacity memory and a congestion detection unit 1 are provided. The above-mentioned location registration information is stored in this memory in association with the telephone number. When an incoming call is received, it is necessary to detect in which area the mobile station MS of the other party is located. Therefore, the mobile communication exchange MSC refers to the contents of the memory and recognizes the position of the other party. Also, as described above, when each mobile station MS moves across the area, the home memory H is transmitted via the mobile communication exchange MSC.
Location registration is performed on M. Thus, the home memory H
M is frequently accessed from the mobile switching center MSC, but its processing capacity has certain limitations.

The congestion detection unit 1 provided inside the home memory HM stores a threshold value corresponding to the processing capability of the home memory HM in advance, and constantly compares the threshold value with the number of accesses per unit time. When the number of accesses exceeds a threshold, a congestion state is detected to generate a congestion detection signal. The threshold value is set in accordance with the processing capacity of the home memory HM so that congestion can be detected. However, the threshold is set so that a sign of the congestion can be detected before an occurrence of congestion and an appropriate regulation instruction can be given. It may be set to a value slightly lower than the value.

1-3: Traffic Control Device Next, the traffic control device TCE includes a congestion determination unit 2,
A regulation ground determination unit 3 and a regulation instruction unit 4 are provided. The congestion determination unit 2 transfers traffic information TJ from each mobile communication switching system MSC in addition to the congestion detection signal from each home memory HM. Here, the contents of the traffic information TJ are shown in FIG. As shown in the figure, the traffic information TJ
Is composed of the number of accesses X associated with each home memory number HMNO. Home memory number HM
NO is a number for identifying each home memory HM. Therefore, the number of accesses X for each home memory HM can be known by referring to the traffic information TJ. The congestion determination unit 2 counts the traffic information TJ transferred from each mobile switching center MSC and calculates the total number of accesses SX for each home memory HM.

The congestion judging section 2 is provided with a processing capacity table TBL1 shown in FIG. As shown in the figure, the processing capacity Z is stored in the processing capacity table TBL1 for each home memory number HMNO. The congestion determination unit 2 refers to the processing capacity table TBL and compares the processing capacity Z of each home memory HM with the total access count SX. If the total access count SX is lower than the processing capacity Z, the congestion determination unit 2 determines It is determined that it is not in the state. On the other hand, if the total number of accesses SX exceeds the processing capacity Z, the congestion determination unit 2
Determines that the home memory HM is in a congestion state, and generates a congestion detection signal.

Next, upon receiving the congestion detection signal from the home memory HM or the congestion detection signal from the congestion determination unit 2, the regulation ground determination unit 3 specifies the mobile communication exchange MSC to be regulated. Specifically, the mobile communication switching system MSC in the congested area of the home memory HM is specified.

Next, the regulation instructing section 3 comprises a regulation ground determining section 3.
A restriction instruction table TBL2 is generated based on the result of the determination. FIG. 4 shows an example of the regulation instruction table TBL2. Each home memory H is stored in the regulation instruction table TBL2.
The telephone number band accommodated by M and the home memory HM
Is stored in advance. Also, each mobile communication exchange M controlled by each home memory HM
SC exchange number MSCNO is home memory number HMN
It is stored in advance in association with O. Further, the control amount P calculated in association with the exchange number MSCNO
Is stored. The restriction amount P indicates the number of accesses permitted in each mobile communication switching system MSC. Therefore, referring to the regulation instruction table TBL2, each mobile communication exchange M
The control amount P to the SC can be known. For example, the regulated amount of the mobile communication switching system MSC corresponding to the switching system number MSCNO2 is P2.

There are various methods for calculating the restricted amount P. For example, the number of accesses permitted to the mobile communication exchange MSC to be regulated is calculated, and the access number is generated in each mobile communication exchange MSC. This is performed by proportional distribution according to the number of calls. The restriction instruction unit 4 refers to the restriction instruction table TBL2, and sends a restriction amount P and a restriction instruction signal indicating a telephone number band to be restricted to each mobile communication switching system MSC.

1-4: Mobile Communication Switching System Next, the mobile communication switching system MSC has a traffic measuring unit 5.
And a regulated amount distribution unit 6. The traffic measuring unit 5 calculates the number of accesses X to the home memory HM per unit time for each home memory HM based on the call from the radio base station BS, and outputs the traffic information TJ shown in FIG.
Generate

The regulated amount distribution unit 6 equally distributes the regulated amount P indicated by the regulation instruction signal from the traffic control device TCE to the respective radio base stations BS controlled by the mobile communication switching system MSC, and controls the regulated amount distribution table. Generate TBL3. FIG. 5 shows an example of the regulated amount distribution table TBL3. As shown in the figure, the regulated amount distribution table TBL3 stores in advance a wireless base station number BSNO and a telephone number band accommodated in each home memory HM. The regulated amount distribution unit 6 evenly distributes the regulated amount P indicated by the regulation instruction signal to each of the radio base stations BS to generate a distribution regulated amount Q, and stores this in the regulated amount distribution table TBL.
3 is stored. Here, the restricted amount distribution table TBL3 shown in FIG. 5 is generated by the mobile communication exchange MSC corresponding to the exchange number MSCNO1, and the traffic control device TCE
Assuming that the restriction amount instruction table TBL2 shown in FIG. 4 is generated, the distribution restriction amount Q becomes Q = P1 / n.
Then, the regulated amount distribution unit 6 controls the regulated amount distribution table TBL.
Referring to 3, the control amount Q and the telephone number band are instructed to each wireless base station BS.

1-5: Radio Base Station Next, a restriction unit 7 is provided in the radio base station BS.
The control unit 7 sets the control amount Q and the telephone number band to the mobile communication exchange MS.
Upon receipt from C, a restriction table TBL4 is generated by associating the restriction amount Q with the telephone number band. Regulation table TBL
4 shows an example of FIG. In this example, the home memory number H
This is a case where congestion has occurred in the home memory HM corresponding to the MNO1, and calls for the telephone number band are restricted. In this case, when processing the call from the mobile station MS, the radio base station BS refers to the restriction table TBL4 based on the telephone number of the other party and performs restriction.

In this way, since the call is regulated at the radio base station BS, an invalid call does not occur between the radio base station BS and the mobile communication switching system MSC. As a result, call loss due to congestion in the home memory HM can be prevented, the number of completed mobile communication calls can be maximized, and equipment can be used effectively.

2. Operation of First Embodiment Next, the operation of the mobile communication system according to the first embodiment will be described with reference to the drawings. FIG. 7 is a flowchart showing the operation of the mobile communication system according to the first embodiment.

First, each mobile communication switching system MSC generates traffic information TJ indicating the number of accesses per unit time for each home memory HM in the traffic measuring section 5 (step S1), and transfers this to the traffic control device TCE. I do.

Next, when the traffic information TJ is transferred to the traffic control device TCE, the congestion judging section 2 counts the traffic information TJ from each mobile communication switching system MSC for each home memory HM and totals the number of accesses SX. Is calculated (step S2). Thereafter, the congestion determination unit 2 refers to the processing capacity table TBL1, acquires the maximum number of accesses Z allowed in each home memory HM, and compares this with the total number of accesses SX to determine whether the state is congested. It is determined whether or not it is (step S3). If the total number of accesses SX exceeds the processing capacity Z, the determination result is YES and the home memory HM is determined to be in a congested state, and the process proceeds to step S5. On the other hand, the total access count SX is equal to the processing capacity Z.
If the value is less than, the determination result is NO, and step S
Proceeding to 4, it is determined whether a congestion detection signal has been detected. The congestion detection signal is generated when congestion occurs in each home memory HM as described above.

Therefore, when a congestion detection signal is detected, it is necessary to regulate even if the determination result in step S3 is NO. Therefore, when the congestion detection signal is detected, the process proceeds to step S5, and the control ground is determined. Here, the regulated ground is determined by the regulated ground determining unit 3. The control ground determination unit 3 specifies the home memory HM where the congestion has occurred, and determines the mobile communication switching system MSC within the control range of the home memory HM as the control ground.

Next, when the control ground is determined, the control instruction unit 4 calculates a control amount for each of the mobile communication exchanges MSC to be controlled, and sets a control instruction table TBL shown in FIG.
Generate 2. In this example, the home memory number H
The home memory HM corresponding to the MNO1 is in a congested state, and the control amounts of the mobile communication exchanges MSC corresponding to the exchange numbers MSCNO1 to 3 are P1 to P3. Then, the regulation instruction unit 4 refers to the regulation instruction table TBL2, generates a regulation instruction signal, and transfers this to the mobile communication exchange MSC to be regulated (step S6).

Mobile communication exchange M which has received the regulation instruction signal
In the SC, the regulated amount distribution unit 6 distributes the regulated amount (step S7). In this example,
The regulated amount is evenly distributed to the respective radio base stations BS, and a regulated amount distribution table TBL3 (see FIG. 5) is generated. After this,
The regulated amount distribution unit 6 notifies each wireless base station BS of the regulated amount equally divided and the telephone number band managed by the congested home memory HM (step S8).

Next, when the radio base station BS receives the restriction amount and the telephone number band from the mobile communication switching system MSC, it stores the restriction amount in the restriction table TBL4 in association with the telephone number band. Then, when processing the call from the mobile station MS, the wireless base station BS refers to the restriction table TBL4 based on the telephone number of the other party and performs restriction.

As described above, in the first embodiment, since the call is regulated at the radio base station BS, an invalid call does not occur between the radio base station BS and the mobile communication switching system MSC. As a result, call loss due to congestion in the home memory HM can be prevented, the number of completed mobile communication calls can be maximized, and equipment can be used effectively.

B. Second Embodiment Next, a mobile communication system according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 8 shows the overall configuration of the mobile communication system according to the second embodiment. This mobile communication system is characterized in that the restricted amount distribution unit 6 is not provided in the mobile communication exchange MSC, and the traffic control device TCE
This is different from the first embodiment in that the restriction instruction section 4 directly issues a restriction instruction to each wireless base station BS. Also, the traffic information TJ generated by the traffic measurement unit 5
And the contents of the restriction instruction table TBL2 can be restricted for each radio base station BS.
This is different from the embodiment. Hereinafter, the differences will be mainly described.

The traffic measuring unit 5 of the mobile communication switching system MSC measures traffic and generates traffic information TJ as in the first embodiment. However, in the first embodiment, the traffic of the exchange is measured, but the second embodiment is different in that the traffic is measured for each radio base station BS. In this case, the traffic measuring unit 5
When the call from S is processed, it records which radio base station BS it is. FIG. 9 shows an example of the traffic information TJ. As shown in the figure, a home memory number HMNO and a wireless base station number BSNO are associated with the traffic information TJ, and the number of accesses X to the home memory HM is recorded for each wireless base station BS. I have. Therefore, by referring to the traffic information TJ, the number of accesses X to each home memory HM can be known for each wireless base station. For example, if the traffic information TJ is as shown in FIG. 9, in order to process a call from the radio base station BS corresponding to the radio base station number BSNO1, the mobile communication switching center MSC responds to the home memory number HMNO1. This means that the home memory HM has been accessed X11 times per unit time.

Next, in the traffic control device TCE, the congestion judging unit 2 calculates the total number of accesses SX for each home memory HM by summing up the traffic information TJ from each mobile communication switching system MSC, Z is compared with Z to determine the congestion state. This is the same as in the first embodiment. If it is determined that the mobile station is in the congestion state, the regulation ground determination unit 3 determines the radio base station BS to be regulated based on the home memory number HMNO of the home memory HM in the congestion state.

Next, the regulation instructing section 3 comprises a regulation ground determining section 3.
A restriction instruction table TBL2 is generated based on the result of the determination. FIG. 10 shows an example of the regulation instruction table TBL2. Each home memory H is stored in the regulation instruction table TBL2.
The telephone number band accommodated by M and the home memory HM
Is stored in advance. Also, each mobile communication exchange M controlled by each home memory HM
SC exchange number MSCNO is home memory number HMN
It is stored in advance in association with O. The radio base station number BS is associated with each exchange number MSCNO.
NO is stored in advance. Further, the radio base station number B
The regulated amount P calculated in association with the SNO is stored. The restriction amount P indicates the number of accesses permitted in each radio base station BS. Therefore, the regulation instruction table TBL
2, it is possible to know the regulated amount P for each wireless base station BS.

In this case, the regulated amount P is the home memory HM
Is calculated by performing an operation of proportionally distributing the processing capacity Z to the number of accesses from each radio base station BS. For example, the home memory HM having the processing capacity Z1 is in a congested state, and the home memory HM has the radio base station number BSNO
It is assumed that only the wireless base stations BS corresponding to 1 to 3 are managed. Here, if the access times X corresponding to the wireless base station numbers BSNO1 to 3 are X11, X12, and X13, respectively, the control amount P11 for the wireless base station number BSNO1 is used.
Is given by the following equation. P11 = Z1 * ｛X11 / (X11 + X12 + X1
3)｝

Next, the regulation instructing section 4 refers to the regulation instruction table TBL2 and controls each radio base station B to be regulated.
The control instruction signal is transferred to S. The restriction instruction signal indicates a telephone number band and a restriction amount managed by the congested home memory HM. The restriction unit 7 of each radio base station BS controls the call based on the restriction instruction signal.

As described above, according to the second embodiment, since the call is regulated at each radio base station BS, an invalid call between the radio base station BS and the mobile communication switching system MSC due to the congestion of the home memory HM. Communication is not performed. Further, since the control amount is calculated in accordance with the number of accesses X to the home memory HM associated with the processing of a call generated in each wireless base station BS, it is possible to perform the control that is appropriate for the traffic of each wireless base station BS. Becomes

C. Third Embodiment Next, a mobile communication system according to a third embodiment of the present invention will be described with reference to the drawings. 1. Configuration of Third Embodiment FIG. 11 is a block diagram of a mobile communication system according to the third embodiment. This mobile communication system is the same as the second embodiment except that a database 8 is provided in the traffic control device TCE.

The database 8 is generated based on the traffic information TJ. FIG. 12 shows an example of the database. As shown in the figure, the database 8 is divided for each wireless base station number BSNO, in which the number of accesses X corresponding to the home memory number HMNO is stored in association with the time. Then, the new access count is sequentially stored with the passage of time. In this example, 10:10 am on April 1, 1997
In 15 minutes, the wireless base station BS corresponding to the wireless base station number BSNO1 has accessed X11 times to the home memory HM corresponding to the home memory number HMNO1.

By the way, since the traffic of the mobile communication system which changes every moment is stored in the database 8 in a fragmented manner, if the contents of the database 8 are analyzed,
It is possible to know in what time zone which radio base station BS has increased the number of times of access. For example, in a commuting time zone, there is a time variation such that the number of accesses of the radio base station BS along the track tends to increase, and a radio base station B in an area where offices are concentrated in the morning on Monday.
Weekly fluctuations such as an increase in the number of accesses in S,
Radio base station B in the area where the downtown area is located on Christmas and holidays
In S, it is possible to know seasonal fluctuations such as an increase in the number of accesses.

2. Operation of Third Embodiment Next, the operation of the regulation process using the database 8 will be described. 2-1: Congestion Determination Processing The congestion determination unit 2 calculates the growth rate W of the current total access number SX (total number of accesses to each home memory HM), and refers to the database 8 to The elongation rate W 'predicted from the total number of accesses SX' in the time zone is calculated. In this case, the past total access count S
The growth rate W 'of X' is calculated by taking into account any of time variation, weekly variation, seasonal variation, or any combination thereof.

Next, the actual elongation W and the predicted elongation W 'are compared to determine whether or not the actual elongation W exceeds the predicted elongation W'. Then, when the actual growth rate W exceeds the predicted growth rate W ′, the future total number of accesses SX is predicted based on the actual growth rate W and the predicted growth rate. Then, the total number of accesses SX in the future is equal to the processing capacity Z of the home memory HM.
Is determined, and if the future total access count SX exceeds the processing capacity Z, a congestion prediction signal is generated.

This will be specifically described. FIG.
3 shows an example of the total number of accesses SX 'of the day and the actual total number of accesses SX predicted from the change of the total number of accesses in the past. FIG. 14 shows an example of a predicted growth rate W ′ of the total number of accesses SX ′ on the day and an actual growth rate W of the total number of accesses SX.

In this example, as shown in FIG.
The total access number SX ′ predicted at 12:00 am is the maximum. On the other hand, the actual number of accesses SX coincides with the predicted number of accesses SX 'until time t1, but thereafter exceeds the predicted number of accesses SX',
Time t2 has been reached. In this case, the actual elongation W is
Until the time t1, it matches the predicted growth rate W ′, but after that, it exceeds the predicted growth rate W ′ and changes at the time t1.
Leads to 2. The congestion determination unit 2 calculates a difference between the current elongation rate W and the predicted elongation rate W ′, and adds the predicted elongation rate to the difference to generate a corrected elongation rate SW. FIG.
The modified elongation rate SW in No. 2 is indicated by a dotted line.

Next, a corrected predicted total access number SSX is calculated based on the corrected elongation rate SW and the actual total access number SX. For example, the corrected predicted total access number SSX at time t2 is given by the following equation. However, T> t2
And SSX (T) = SX (t2) + ∫ _t2 SW (T) dT

Next, the modified predicted total access number SSX is compared with the processing capacity Z. If the modified predicted total access number SSX exceeds the processing capacity Z, a congestion predicted signal is generated.
The generation timing of the congestion prediction signal has the following modes. The congestion prediction signal is generated immediately when the corrected predicted total access number SSX is predicted to exceed the processing capacity Z. The difference between the time at which the corrected predicted total access number SSX is predicted to exceed the processing capacity Z (t3 shown in FIG. 12) and the current time is calculated, and when the time falls below a predetermined threshold value, the congestion prediction signal is calculated. Generate

2-2: Regulation Instruction Processing Next, regulation instruction processing is performed on the regulation ground. When detecting the congestion prediction signal from the congestion determining unit 2, the control ground determination unit 3 determines each wireless base station BS managed by the home memory HM where the congestion is predicted as the control ground.

Thereafter, the regulation instructing unit 4 predicts the number of times each radio base station BS accesses the home memory HM at the time when the corrected predicted total number of accesses SSX is predicted to exceed the processing capacity Z. The predicted number of accesses in this case is calculated by the same method as the above-mentioned modified total number of accesses SSX. Then, the processing capacity Z is proportionally distributed based on the predicted number of accesses of each radio base station BS,
The restriction amount P for each wireless base station BS is calculated, and the restriction instruction table TBL2 (see FIG. 10) described in the second embodiment is generated. Thereafter, a regulation instruction signal for instructing the telephone number band and the regulation amount P is transmitted to each radio base station BS with reference to the regulation instruction table TBL2. Each radio base station BS
Performs call regulation based on the regulation instruction signal.

As described above, according to the present embodiment, the number of accesses is predicted in consideration of seasonal variation, weekly variation, or time variation from the transition of the past number of accesses, and based on the predicted number of accesses and the actual number of accesses. Then, the number of future accesses is predicted again, and congestion is predicted based on this. Therefore, regulation control can be performed before congestion occurs.

D. 2. Modifications Although the embodiment according to the invention has been described above, the invention is not limited to the embodiment described above, and various modifications described below are possible. In the above embodiments, the traffic information TJ
Was measured by the traffic measuring unit 5 of the mobile communication switching system MSC, but the present invention is not limited to this, and the traffic information TJ may be generated by each radio base station BS. In this case, a traffic measuring unit 5 is provided in each radio base station BS. Home memory number HMNO
What is necessary is just to measure every time.

In the second and third embodiments described above,
Although the restriction instruction from the traffic control device TCE is issued directly to each radio base station BS without passing through the mobile communication exchange MSC, the restriction instruction may be issued via the mobile communication exchange MSC. The point is that the traffic control device TC sets the regulated amount according to the number of accesses of each radio base station BS.
The route of the regulation instruction may be any route as long as it is generated by the regulation instruction unit 4 of E and each radio base station BS can perform the regulation in accordance with the regulation amount.

In each of the embodiments described above, the congestion determination unit 2 of the traffic control device TCE determines the congestion state based on the processing capacity Z of the home memory HM in the congested state. May be stored in a memory in advance, and congestion may be determined based on this.

In each of the embodiments described above, the regulation instruction unit 4 of the traffic control device TCE calculates the regulation amount P by proportionally distributing the processing capacity Z based on the number of accesses, but the present invention is not limited to this. Instead, non-linear weighting may be performed to distribute the regulated amount. In short, any distribution method may be used as long as the regulated amount is distributed according to the number of accesses.

[0059]

As described above, according to the invention specifying matter according to the present invention, since the restriction instruction is issued for each radio base station,
Communication of an invalid call between the wireless base station and the mobile communication exchange can be prevented, and the equipment can be effectively used. Further, since the restriction amount is controlled according to the number of times of access of each wireless base station, it is possible to perform the restriction according to the traffic of each wireless base station. In addition, since the number of future accesses is predicted based on the number of past accesses and the number of current accesses, it is possible to predict even before congestion actually occurs, and perform regulation control.

[Brief description of the drawings]

FIG. 1 is a block diagram of a mobile communication system according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of the content of traffic information according to the embodiment.

FIG. 3 is a diagram showing an example of the contents of a processing capability table according to the embodiment;

FIG. 4 is a diagram showing an example of the contents of a regulation instruction table according to the embodiment.

FIG. 5 is a diagram showing an example of the contents of a regulated amount distribution table according to the embodiment.

FIG. 6 is a diagram showing an example of the contents of a restriction table according to the embodiment.

FIG. 7 is a flowchart showing an operation of the mobile communication system according to the embodiment.

FIG. 8 is a block diagram of a mobile communication system according to a second embodiment of the present invention.

FIG. 9 is a diagram showing an example of the content of traffic information according to the embodiment.

FIG. 10 is a diagram showing an example of the contents of a regulation instruction table according to the embodiment.

FIG. 11 is a block diagram of a mobile communication system according to a third embodiment of the present invention.

FIG. 12 is a diagram showing an example of the contents of a database according to the embodiment.

FIG. 13 is a diagram illustrating an example of a total access count SX ′ of the day and an actual total access count SX predicted from a change in the past total access count in the embodiment.

FIG. 14 is a diagram showing an example of a predicted growth rate W ′ of the total access frequency SX ′ and an actual growth rate W of the total access frequency SX in the present embodiment.

[Explanation of symbols]

 MS mobile unit HM home memory MSC mobile communication switch BS radio base station TJ traffic information 2 congestion determination unit (congestion detection unit) 3 regulation ground determination unit (regulation ground determination unit) 4 regulation instruction unit (regulation instruction unit) 5 traffic measurement unit 6 regulated amount distribution unit (regulated amount distribution means) 7 regulated unit 8 database (storage means)

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04Q ^7/ 00-7/38 H04B ⁷ /24-7/26 H04M 3/00

Claims (6)

(57) [Claims] 1. A plurality of mobile devices for generating a call, a plurality of home memories storing position information indicating a position of the mobile device and communication information indicating a communication state of the mobile device, and communicating with the mobile device. A plurality of radio base stations having communication means for performing the call and a restriction means for restricting a call from the mobile device; and mobile communication for accessing the home memory in response to a call from the radio base station and processing the call. An exchange, congestion detecting means for detecting congestion in each of the home memories,
A regulation ground determining means for determining the radio base station to be regulated based on the detection result of the congestion detection means, and a regulation instruction to the radio base station regulated by the regulation ground determination means. A traffic control system for mobile communication, comprising: 2. A plurality of mobile units for generating a call, a plurality of home memories storing position information indicating a position of the mobile unit and communication information indicating a communication state of the mobile unit, and communication between the mobile units. A plurality of radio base stations having communication means for performing the call and a restriction means for restricting a call from the mobile device; and call processing for accessing the home memory in response to a call from the radio base station and processing the call. Means, a traffic measuring means for measuring the number of accesses to the home memory when processing the call for each home memory to generate traffic information, and a restriction amount instructed when a restriction instruction is issued. A mobile communication exchange having a regulated amount distributing unit for distributing to each radio base station; a congestion detecting unit for detecting congestion in each of the home memories based on the traffic information; Traffic control comprising: a regulation ground determination means for determining a regulation ground based on a detection result of the means; and a regulation instruction means for instructing the mobile communication exchange, which has been regulated to the ground by the regulation ground determination means, the regulation amount. A traffic control system for mobile communication characterized by comprising a device. 3. The regulated amount distributing means distributes a regulated amount evenly to each of the radio base stations.
4. The traffic control system for mobile communication according to 1. 4. A plurality of mobile units for generating a call, a plurality of home memories for storing position information indicating a position of the mobile unit and communication information indicating a communication state of the mobile unit, and a communication between the mobile units. A plurality of radio base stations having communication means for performing the call and a restriction means for restricting a call from the mobile device; and call processing for accessing the home memory in response to a call from the radio base station and processing the call. Means, a mobile communication switch having a traffic measuring means for generating the traffic information by measuring the number of accesses to the home memory for each of the home memories when processing the call, and each of the mobile communication switches based on the traffic information Congestion detection means for detecting congestion in the home memory; regulation ground determination means for determining a regulation ground based on the detection result of the congestion detection means; And a traffic control device having a restriction instruction means for calculating the restriction amount of each of the radio base stations in accordance with the indicated access times and indicating the restriction amount and a telephone number band to be restricted. A traffic control system for mobile communication characterized by the following. 5. The traffic control system for mobile communication according to claim 4, wherein said traffic measuring means is provided in each of said radio base stations instead of providing said traffic measuring means in said mobile communication exchange. 6. A congestion detecting means of the traffic control device, comprising: accumulating means for accumulating the past traffic information; estimating means for estimating the number of accesses based on the traffic information accumulated in the accumulating means; Calculating means for calculating the number of future accesses based on the obtained number of accesses and the actual number of accesses, and determining means for determining whether the number of future accesses exceeds the processing capacity of the home memory, 6. The traffic control system for mobile communication according to claim 4, wherein the congestion is detected when the determination unit determines that the future access count exceeds the processing capacity of the home memory.