JPH10136423A - Traffic control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain spedy recovery from a contested state while securing resources enabling a communication service to a high-priority mobile station by regulating the processing of a call defining a mobile communication exchange station as the call terminating destination when the result of discrimination reported by a state reporting means is true. SOLUTION: A zone existent mobile station monitoring means 13 finds the number of mobile stations existent in the zone by operating the difference between the number of mobile stations entering the zone and the number of mobile stations leaving the zone. A state reporting means 14 discriminates whether that number exceeds a preset upper limit value and the congested state is detected by a mobile report exchange station 11 or not and reports the discriminated result to exchange stations 121 -12N. The exchange stations 121 -12N perform call processing as call originating sources or repeater stations while being linked through a network to call processing performed by the mobile report exchange station 11 but when the discriminated result reported by the state reporting means 14 is true, call processing is regulated concerning the call defining the mobile report exchange station 11 as the call terminating destination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention restricts the call processing of a call generated in a congested state in a mobile communication switching center in a network including a mobile communication switching center for processing a call generated in a mobile communication system. It relates to a traffic control method.

[0002]

2. Description of the Related Art A service area of a mobile communication system is formed as a single radio zone or a set of a plurality of radio zones, and radio base stations forming these radio zones are adapted to a traffic distribution calculated in advance. A number of radio channels are allocated. However, regarding the number of mobile stations located in each wireless zone, for example, in the case of road congestion, occurrence of an accident, or an event, although traffic may be locally and temporarily concentrated in a specific wireless zone, In general, it is set under the finiteness of radio frequency resources as resources and the cost of system operation.

[0003] Therefore, a network connected to such a mobile communication system employs a traffic control system which regulates the call processing of a call that has occurred in a congested state while suppressing the degradation of service quality as much as possible. FIG. 9 is a diagram illustrating an example of a conventional traffic control method. In the figure, the mobile communication switching center 81 ₁ connected individually to a plurality of radio base stations, not shown, is connected to other mobile services switching center 81 _{2-81 4} via a public network 82.

In a conventional example having such a configuration, for example, the mobile communication switching office 81 ₁ is in a congested state (for example, an overloaded state of a processor performing call processing, an increase in call loss on an inter-station transmission path,
This is detected as congestion of the common channel signaling link, lack of trunks and other resources to be allocated to newly generated calls. Or fallen into), when moving away from the congestion state is not shown interoffice signal lines (giving a notice to that effect to the mobile switching center 81 _{2-81 4} via a communication link) (FIG. 10 (l) , (2)).

Mobile switching center 81_Two~ 81_FourMentioned above
Mobile switching center 81 based on the notification ₁ Is congested
Notification that the congestion state has been exited.
Unless otherwise specified, outgoing calls and relay calls
Mobile switching center 81₁ Call processing for calls to
Regulate at a fixed rate (hereinafter referred to as “regulation rate”)
(FIG. 10 (3)).

[0006] Note that such regulation rate, mobile switching center 81 _{2-81 4} each mobile switching center 8
1 ₁ In the preset range of the distribution of traffic for between, output path which can be subjected to the connection between the mobile switching center 81 _1, dynamically depending on the occupation state of the trunk other resources It is also possible to vary. The mobile communication switching center 81 _1, when the own station as described above falls into a congestion state, restriction in the same manner as the call processing of the call to the mobile switching center 81 _{2-81 4} and destination (FIG. 10 (4)).

[0007]

Meanwhile [0008] In such a conventional example, in the mobile communication switching center 81 _{1-81 4} subject to regulations call processing call is uniformly determined based on the control rate described above Therefore, for example, for a mobile station having a subscriber class having a higher priority than a general subscriber, such as a VIP class, the above-described resources increase as the number of calls that have occurred regardless of the subscriber class increases. Are sequentially assigned to calls that occurred earlier, so it is highly possible that services will not be provided.

However, a congestion state is a characteristic of a mobile communication system in which a subscriber can move, and as described above, when a road is congested, a radio base station installed near the road has a high probability. However, the same problem may occur when a fault occurring in the radio base station or the mobile communication switching center is restored. In a small-zone mobile communication system, each mobile station transmits a mobile communication switching center via a radio base station in accordance with location registration and switching of a busy channel in response to an outgoing call or an incoming call. 81 ₁ to 8
To access the 1 _4.

[0009] Such location registration and channel switching during a call are performed by the mobile communication switching center 8 as a target of call processing performed in cooperation with the radio channel setting control performed by the radio base station.
1 ₁ becomes to 81 ₄ of the load, especially in urban areas, the load must not less negligibly to the load involved in call processing outgoing calls and incoming calls to the radio zones are densely formed in a large number.

[0010] Furthermore, in the processing relating to location registration and channel switching during a call, regulations are generally not allowed in order to maintain high service quality and call quality for completed calls. When there are many mobile stations located in a zone (hereinafter, simply referred to as “located mobile stations”), processing relating to location registration has been a factor that causes a long congestion state.

[0011] In addition, such a congested state generally spreads to other exchanges because the originator of the incomplete call frequently re-transmits to the mobile communication exchange once the congested state has occurred. It was likely. The present invention provides a traffic control system that quickly escapes from a congestion state while securing resources capable of providing a communication service to a high-priority mobile station in a congestion state occurring in a mobile communication switching center. The purpose is to do.

[0012]

FIG. 1 is a block diagram showing the principle of the present invention. According to the first aspect of the present invention, a radio channel setting control that performs call processing of a call generated by a mobile station located in a radio zone individually formed by one or a plurality of radio base stations is performed by these radio base stations. A mobile communication exchange station 11 that performs the operations in cooperation with each other, and performs a mobile station that has entered and exited the area, detects a congestion state of the own station, and detects a departure from the congestion state; Between the mobile communication switching stations 11
Exchanges 12 _{1 to} 12 _N that perform call processing as a call source or a relay station while coordinating with the call processing performed by the mobile communication exchange 11 and the number of mobile stations detected and entered by the mobile communication exchange 11. Serving mobile station monitoring means 1 for obtaining the number of serving mobile stations by calculating the difference from the mobile station that has gone out of service
3 and the number obtained by the serving mobile station monitoring means 13 exceeds a preset lower limit value, and the mobile communication switching center 1
1 to determine whether the congestion state is detected,
And a status notification unit 14 for notifying the result of the determination to the exchange 12 ₁ to 12 _N, when the switching center 12 ₁ to 12 _N is the result of the determination notified by the status notification unit 14 is true, the mobile It is characterized by having means for restricting the call processing of a call having the communication switching center 11 as a destination.

According to a second aspect of the present invention, in the traffic control system according to the _{first aspect} , all or a part of the exchanges 12 _{1 to} 12 _N perform radio channel setting control in the same manner as the mobile communication exchange 11. Perform call processing while coordinating with
The mobile station monitoring means 13 has means for detecting the congestion state of the mobile station that has entered and exited the service area and its own station and departure from the congestion state. Station 12 ₁
It is characterized in that the load is distributed to a switching center having means out of 〜12 _N.

According to a third aspect of the present invention, in the traffic control system according to the _{first aspect} , all or a part of the exchanges 12 _{1 to} 12 _N perform radio channel setting control in the same manner as the mobile communication exchange 11. And a means for detecting the congestion state of the mobile station that has entered and exited the area and its own station and exiting from the congestion state. Are mobile communication exchanges 11 and exchanges 12 ₁ to 12 ₁
12 of _N, characterized in that provided in the stations upper revised with an exchange having a unit.

According to a fourth aspect of the present invention, in the traffic control system according to any one of the first to third aspects, the mobile communication switching center 11 is a mobile communication switching center, Determine the number of priority mobile stations having a subscriber class with high call processing priority, and determine whether there are resources required for call processing for calls that occur simultaneously in all of these priority mobile stations or priority mobile stations with a predetermined ratio. And a state in which the result of the determination is false is detected as a congestion state.

According to a fifth aspect of the present invention, in the traffic control system according to any one of the first to fourth aspects, the mobile communication switching station 11 is a mobile station which is located in a congested state. The number of calls to be processed is identified as a degree corresponding to the ascending order of the numbers, and means for thinning out calls to be subjected to call processing at a larger ratio as the degree is higher. According to a sixth aspect of the present invention, in the traffic control method according to the fifth aspect, the mobile communication switching center 11 determines whether the home area of the mobile station where the call has occurred is the service area of the mobile station. It is characterized in that it has means for judging under the coordination with the channel setting control or based on the procedure of the call processing, and when the result of the judgment is false, expanding the ratio of thinning out of the calls to be processed. And

According to a seventh aspect of the present invention, there is provided a traffic control system according to the fifth aspect, wherein
For the mobile station where the call originated, determine whether or not the carrier to which it belongs is the operator of the mobile station under the coordination with the radio channel setting control or based on the call processing procedure. When the result is false, there is provided a means for increasing the rate of thinning out of the calls to be processed.

In the traffic control system according to the first aspect of the present invention, the mobile communication switching center 11 calls a call originating from a mobile station located in a wireless zone formed by one or more wireless base stations. The processing is performed in cooperation with the radio channel setting control performed by these radio base stations, and the mobile station that has entered and exited the service area, the congestion state of its own station, and the departure from the congestion state are detected. The serving mobile station monitoring means 13 obtains the difference between the number of mobile stations that have been detected in this way and have already entered the service area and the mobile station that has served the service area, as described above. Find the number of The state notifying means 14 determines whether or not the number exceeds a preset lower limit value and whether or not the above-mentioned congestion state is detected by the mobile communication switching center 11 and the result of the determination is determined by the switching stations 12 ₁ to 12 ₁ . to notify the 12 _N.

The exchanges 12 _{1 to} 12 _N are mobile communication exchanges 1
The call processing performed by the status notification means 14 is true, while the call processing performed by the status notification means 14 is performed while the call processing performed by the status notification means 14 is performed while coordinating with the call processing performed by No. 1 via a network or an inter-station transmission path. At times, the call processing is restricted for a call that is destined to the mobile communication switching center 11. That is, the exchanges 12 _{1 to} 12 _N determine that the mobile communication exchange 11 that is the destination is in a congestion state and that the mobile communication exchange 11
If the total number of mobile stations located in the wireless zone under the control of the mobile station exceeds the lower limit, the call processing of the corresponding call is restricted. Therefore, the number of mobile stations located in the area does not fluctuate significantly in response to channel switching or location registration during a call that occurs due to the movement of these mobile stations, and it is expected that traffic will increase as the number increases. As far as it can be done, an excessive congestion state can be prevented for each mobile communication switching center without performing complicated traffic monitoring adapted to entry and exit in each wireless zone.

In the traffic control system according to the second aspect of the present invention, in the traffic control system according to the first aspect, all or a part of the exchanges 12 _{1 to} 12 _N are similar to the mobile communication exchange 11. In addition to performing the call processing in cooperation with the wireless channel setting control, the mobile station that has entered and exited the service area and the congestion state of the own station and the departure from the congestion state are detected. Also, visiting mobile station monitoring unit 13 includes a mobile services switching center 11, of the switching center 12 ₁ to 12 _N, it is load balanced and all mentioned above or a part of the switching center.

That is, since the mobile communication switching station 11 and all or some of the above-mentioned switching stations 12 _{1 to} 12 _N individually determine the number of mobile stations located in the area, the existing home memory station and the higher-level station are determined. Without adding means for obtaining such a number, excessive congestion can be prevented in the unit of an exchange in the same manner as in the traffic control system according to the first aspect.

In the traffic control method according to the third aspect of the present invention, in the traffic control method according to the first aspect, all or a part of the exchanges 12 _{1 to} 12 _N are the same as the mobile communication exchange 11. In addition to performing the call processing in cooperation with the wireless channel setting control, the mobile station that has entered and exited the service area and the congestion state of the own station and the departure from the congestion state are detected. Moreover, visiting mobile station monitoring unit 13 includes a mobile services switching center 11, of the switching center 12 ₁ to 12 _N, provided in the stations upper revised with all described above or a part of the switching center.

That is, for the individual exchanges including the mobile communication exchange 11, the number of individually located mobile stations is collectively obtained by these mobile stations and the station that manages the traffic. Excessive congestion is prevented in the same manner as the traffic control method according to the first aspect under the configuration of the network adapted to the ladder. In the traffic control method according to the fourth aspect of the present invention, the traffic control method according to the first to third aspects is provided.
In the traffic control method according to any one of the above items, the mobile communication switching station 11 obtains the number of priority mobile stations having a subscriber class having a high call processing priority among mobile stations located within the mobile station. In addition, the presence / absence of resources required for call processing is determined for calls occurring simultaneously to all of these priority mobile stations or to the priority mobile stations having a predetermined ratio, and a state in which the result of the determination is false is detected as a congestion state. I do.

That is, for a mobile station having a subscriber class having a lower call processing priority than the above-mentioned priority mobile station, the call is made while resources to be preferentially allocated to the call generated in the above-mentioned priority mobile station are secured. Excessive congestion is prevented for each exchange in the same manner as in the traffic control method according to the first to third aspects, which is subject to processing restrictions.

In the traffic control system according to the fifth aspect of the present invention, the mobile switching center 11 identifies a congestion state as a degree corresponding to an ascending order of the number of mobile stations located in the mobile station, and performs call processing. The higher the degree, the thinner the target calls are.

That is, even if there are resources to be allocated in the course of call processing for the generated call, the calls to be processed are thinned out at a ratio corresponding to the degree of congestion. When the amount increases rapidly, it is possible to shorten the time required to enter the congestion state and promote the escape from the congestion state. In the traffic control method according to the invention described in claim 6, the mobile communication switching center 11
For the mobile station where the call originated, it is determined whether or not the home area is the service area of the own station under the coordination with the radio channel setting control or based on the procedure of the call processing, and the result of the determination is false. At a certain time, the ratio of thinning out calls to be processed is expanded.

That is, among roaming mobile stations among the mobile stations located in the own station, call processing of a call that has occurred is regulated with a higher probability than other mobile stations. Of the service quality due to the increase in the number of services is suppressed. In the traffic control method according to the seventh aspect of the present invention, the mobile communication switching center 11 determines whether or not the communication carrier to which the call originates is the operator of the local station by the radio channel setting control. The determination is made under the coordination of the above or based on the procedure of the call processing, and when the result of the determination is false, the ratio of the thinning out of the call to be processed is expanded.

That is, of the mobile stations located within the own station, the mobile station belonging to a non-operator of the station is regulated with a higher probability of the call processing of the call that has occurred than the other mobile stations. In this way, a decrease in service quality due to an increase in mobile stations belonging to another communication carrier is suppressed.

[0029]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a diagram showing an embodiment corresponding to the first to seventh aspects of the present invention. In the figure, components having the same hardware configuration as those shown in FIG. 9 are denoted by the same reference numerals, and description thereof is omitted here. The configuration of this embodiment is different from that of the conventional example shown in FIG. 9 in that the mobile communication exchanges 81 _{1 to} 81 ₄ have communication links 41 ₁ respectively.
To 41 ₄ are connected to the home memory station 42 via, and these mobile switching center 81 _{1-81 4} is connected to the network controller 44 via the communication link 43 ₁ to 43 ₄ respectively, the network controller 44 and communication link 4
2 are connected to each other via a communication link 45.

In the correspondence between the present embodiment and the block diagram shown in FIG. 1, the mobile communication exchange 81 ₁ corresponds to the mobile communication exchange 11 and the mobile communication exchanges 81 _{2 to} 81 _4.
Corresponds to the exchange 12 ₁ to 12 _N, the home memory station 42 and the network control station 44 is visiting mobile station monitoring unit 13
, And the network control station 44
Corresponding to

FIG. 3 is an operation flowchart of the mobile communication switching center in the present embodiment. FIG. 4 is an operation flowchart of the home memory station in the present embodiment. FIG. 5 is an operation flowchart of the network control station in the present embodiment. FIG. 6 is a diagram for explaining the operation of the present embodiment corresponding to the first to third aspects of the present invention.

Hereinafter, claims 1 to 3 will be described with reference to FIGS.
The operation of the present embodiment corresponding to the invention described in (1) will be described.
The mobile communication switching stations 81 _{1 to} 81 ₄ recognize the position of the mobile station (the zone in which the mobile station is located) according to the switching of the channel during the call and the position registration while cooperating with the wireless channel setting control performed by the wireless base station (not shown). Communication link 4 as appropriate
1 _{1-41 4} via the notifying appropriate home memory station 42 (FIG. 3 (1), FIG. 6 (l)).

The home memory station 42 registers the position of each mobile station notified in this way in the home memory (FIG. 4 (l), FIG. 6 (2)). Further, the home memory station 42
The identification information of the mobile switching center connected to the radio base station corresponding to the position (here, for the sake of simplicity, it is assumed that the identification information is given as a set of upper bits of a bit string giving the position). by reference was period, the number of visiting mobile stations located in the radio zone under control of the mobile switching center 81 _{1-81 4} counted separately for these mobile service switching center (FIG. 4 (2) ), And notifies the number to the network control station 44 (FIG. 4 (3), FIG. 6 (3)).

The network control station 44 stores this way the number notified by the serving toll table 61 shown in FIG. 7 with associated individually to the mobile communication switching station 81 ₁ to 81 ₄ (FIG. 5 ( 1), FIG. 6 (4)). On the other hand, mobile communication switching offices 81 _1-
81 ₄ performs call processing for calls that occurred in the mobile station located in the radio zone under the own station while associated with the radio channel setting control described above, and parallel with e.g., time rate of an overload condition, the station The system monitors, at a predetermined frequency, for an increase in call loss on the transmission line between them and a shortage of resources such as a common line signaling link and a trunk to be allocated to a newly generated call, and recognizes a congestion state or congestion as a result of the monitoring. When breaking away from the state, and notifies the network control station 44 via the communication link 43 ₁ to 43 ₄ (FIG. 3 (2), 6 (5)).

The network control station 44 performs such communication.
Depending on the knowledge, any mobile communication switching center (here, a simple
The code "81₁ ". ) Is congested
When the mobile communication switching center 81 recognizes that
₁ In the area stored in the area number table 61 corresponding to
Obtain the number of mobile stations (Fig. 5 (2), Fig. 6 (6)) and determine the number in advance.
It is determined whether or not the value exceeds the upper limit. Further
Meanwhile, the network control station 44 determines that the result of the determination is true.
In some cases, the corresponding mobile switching center 81₁ Identification number
Number (here, for simplicity, equal to the code "81₁ "
Assume that ) And a "call processing regulation request"
Generating and communicating link 43_Two ~ 43 _Four Moved through
Mobile switching center 81_Two~ 81_FourThe “call processing regulation request”
It is transmitted (FIG. 5 (3), FIG. 6 (7)).

However, if the result of the above determination is false, the network control station 44 similarly generates an identification number and a "call processing regulation release request" indicating that, and the communication link 43 _2- . 43 ₄ via the mobile switching center 8
And sends the "call processing restriction release request" to 1 _{2-81 4} (FIG. 5 (4), 6 (7)). The mobile communication switching offices 81 _{2 to} 81 ₄
The "call processing restriction request" or "call processing restriction release request" given from the network control station 44 in this manner is held in the restriction control register 62 shown in FIG. 3 (3), (4), FIG.
(8)).

Further, the mobile communication exchanges 81 _{2 to} 81 ₄ obtain the destination of the generated call as a result of the route selection performed under the procedure of the call processing, and transmit the destination to the mobile communication exchange serving as the destination. Correspondingly, it is determined whether or not the request held in the regulation control register 62 is the above-mentioned "call processing regulation request" (FIG. 3 (5)). Further, the mobile communication switching center 81 _{2-81 4,}
If the result of the determination is true, the call processing of the corresponding call is interrupted (FIGS. 3 (6) and 6 (9)), while if false, the call processing is continued.

As described above, according to the present embodiment, the number of mobile stations within the range exceeding the upper limit value and the call processing of calls destined to the mobile communication switching center that has fallen into a congested state is reliably restricted. Therefore, if the upper limit and the criterion for determining the congestion state are appropriately set in advance, the mobile station having a subscriber class having a higher priority than other subscribers, such as a target of the VIP service, On the other hand, excessive congestion is prevented while ensuring the possibility of providing a service.

In this embodiment, the mobile communication switching center 8
The number of mobile stations in the range of 1 1 to 8 _{1 4} is the same as the existing home memory station 4
Although sought collectively by 2, the present invention is not limited to such a configuration, for example, similarly determine the number of visiting mobile station processing load of the mobile communication switching center 81 _{1-81 4} It may be performed under a distributed mode. Hereinafter, the operation of the present embodiment corresponding to the invention described in claim 4 will be described with reference to FIG.

The difference from the embodiment of the invention according to this embodiment and the aforementioned claims 1 to 3, in the procedure of processing by the mobile communication switching center 81 _{1-81 4} performs. The mobile communication exchanges 81 _{1 to} 81 ₄ individually have a priority mobile station count (not shown), which will be described later, and perform location registration and registration in cooperation with the above-described radio channel setting control performed by the radio base station. Performs processing suitable for channel switching during a call.

In the course of such processing, for example, when the mobile communication switching office 81 ₁ recognizes that any mobile station has entered the wireless zone under its control, the mobile communication switching station 811 joins the mobile station. The user class is referred to here (for the sake of simplicity, it is assumed that it is registered in advance as station information in its own station). Furthermore, the mobile switching center 81 ₁ determines whether or not the subscriber class indicates that the subscriber class is a target of a service that should be performed with priority on call processing (for example, a VIP (Very Important Person) service). However, if the result of the determination is false, no processing is performed. In the following, such a subscriber class is referred to as a “priority subscriber class”.

[0043] However, if the judgment result is true, the mobile services switching center 81 ₁ increments the priority mobile station counter provided to the own station. When the mobile communication switching station 81 ₁ recognizes that any mobile station has gone out of the wireless zone under its control in the process of processing for the above-described location registration and channel switching during a call, The subscriber class of the corresponding mobile station is similarly referred to. Further, the mobile switching center 81 ₁ determines whether or not the subscriber class corresponds to the above-mentioned preferred subscriber class. If the result of the determination is false, no processing is performed. If the result is true, the priority mobile station counter is decremented.

Therefore, the priority mobile station counter stores the number of mobile stations that should be given priority in call processing among mobile stations located in the radio zone under the control of each mobile communication switching center. By the way, the mobile communication switching office 81 ₁ monitors the number of resources not to be allocated to any call among resources to be captured in the course of the call processing of the generated call. further,
The mobile communication switching office 81 ₁ has a predetermined ratio (for example, an operation time zone, a call concentration rate in the operation time zone) of the number of mobile stations stored in the priority mobile station counter. It is determined in advance based on the distribution of traffic for each wireless zone or route.) It is determined whether there is a possibility that the number of mobile stations occupying the mobile station will be less than the number required for preferential service.

If the result of the determination is true, the mobile communication switching station 81 ₁ suspends the call processing of the corresponding call and aggressively enters the congestion state even if there is a surplus of other resources. The network control station 4 recognizes that it has fallen
4 is notified (FIG. 3 (2)). However, the mobile switching center 81
₁ is that, when the result of the similar determination is false, the call processing of the corresponding call is continued, and the above-described determination of the congestion state is an embodiment corresponding to the invention according to claims 1 to 3. Is performed based on the same criteria as described above.

[0046] Therefore, according to this embodiment, the mobile communication switching center 81 _{1-81 4} to claims 1 to 3 while ensuring the resources necessary for the call processing of the call relating to a mobile station having a priority subscriber class Excessive congestion is prevented as in the embodiment corresponding to the described invention. In the present embodiment, although the mobile switching center 81 _{1-81 4} are given subscriber class as station information with the individual, the present invention is not limited to such a configuration, for example, the home memory station 42
The subscriber class can be obtained in the same manner by inquiring.

In this embodiment, the target of the VIP service is shown as an example of the priority subscriber class.
The present invention is not limited to the target of such a VIP service, and can be applied to any subscriber class as long as it indicates that call processing and radio channel allocation should be performed with priority over other subscribers. It is.

The operation of this embodiment according to the fifth aspect of the present invention will be described below with reference to FIG. This embodiment is characterized in the steps of processing the mobile communication switching center 81 _{1-81 4} performs. The mobile communication exchanges 81 _{1 to} 81 ₄ have the number of mobile stations in their area (here, for simplicity, the home memory station 4).
Suppose that it is notified by two. ) Is acquired at a predetermined cycle. Further, mobile communication switching offices 81 _{1 to} 81 ₄
Has a plurality of different threshold values in advance, and among these threshold values,
The largest one less than the number obtained in this way is obtained.

Further, the mobile communication exchanges 81 _{1 to} 81 ₄ set a restriction rate in advance as a percentage of calls whose call processing is to be restricted corresponding to the plurality of thresholds described above, respectively. Among them, the control rate corresponding to the maximum threshold value obtained as described above (hereinafter, simply referred to as “set control rate”) is obtained. Further, the mobile communication switching offices 81 _{1 to} 81 ₄ perform the call processing of all or a part (for example, the outgoing call of the mobile station) of the types of calls occurring in the mobile station at a rate equal to the set regulation rate. regulate.

As described above, according to the present embodiment, call processing is thinned out based on a regulation rate preset in accordance with the number of serving mobile stations in units of mobile communication exchanges. It is possible to suppress acceleration of congestion and escape from congestion without monitoring traffic for each wireless zone (wireless base station) in accordance with location registration and channel switching during calls performed according to the movement of We can get on efficiently.

In this embodiment, the mobile communication switching center 8
1 _{1-81 4} retrieves the number of the serving mobile station from the home memory station 42, but the present invention is not limited to such a configuration, for example, associated with the radio channel setting control the radio base station performs , The number of serving mobile stations may be individually added based on the procedure of call processing. Hereinafter, the operation of the present embodiment corresponding to the inventions according to claims 6 and 7 will be described with reference to FIG.

The feature of this embodiment is that the mobile communication exchange 81
In steps of a _{process 1-81 4} performs. Mobile switching center 81
_{1-81 4} (corresponding to the caller or callee.) Mobile station call is originated the subscriber class of the home memory station 42
To obtain the home area identification information indicating the home area to which the mobile station belongs and the identification information of the contracted carrier, by referring to the subscriber class.

Further, the mobile communication exchanges 81 _{1 to} 81 ₄ are individually operated by the communication service provider which operates in accordance with the service area identification information indicating the service area formed by all the radio base stations under its control. Is displayed. The mobile communication switching offices 81 _{1 to} 81 ₄ provide a combination of the service area identification information with the home area identification information obtained as described above, and the identification information obtained in the same manner as the operator identification information. Then, it is determined whether any one of them matches. Further, the mobile communication switching center 81 _{1-81 4} is the judgment result if false applies the control rate similar to the embodiment of the invention according to claim 5, true in the opposite In some cases, a regulation rate higher than the regulation rate is applied.

Therefore, according to the present embodiment, the mobile communication switching center prevents the acceleration of the congestion state by reliably giving priority to the mobile station having its own service area as the home area over the roaming mobile station, and A communication service can be provided while efficiently deviating from the congestion playing state. In the present embodiment, the restriction rate for roaming mobile stations is set high for outgoing calls and incoming calls, but the present invention is not limited to such calls, and if a decrease in service quality is allowed, For example, the present invention is also applicable to call processing adapted to location registration and channel switching during a call.

Further, in the present embodiment, the identification of the roaming mobile station is performed based on the home area to which the mobile station belongs and the communication carrier. However, the present invention is not limited to such a configuration. When the control signal transmitted to the wireless base station based on the procedure of the wireless channel setting control includes information that can be similarly provided for identification, the information is referred to in cooperation with the wireless base station. Is also good.

Further, in each of the embodiments described above, all exchanges are mobile communication exchanges, but at least one exchange
Subscriber line exchanges and transit exchanges connected to one mobile communication exchange via an interoffice transmission line or a public network,
If the call processing restriction request and the call processing restriction release request adapted to the number of serving mobile stations are reliably given to the mobile communication switching center, the present invention can be similarly applied.

Further, in each of the above-described embodiments, the home memory station 42 operates at a constant cycle with the mobile communication exchanges 81 _{1 to} 81 _4.
Although the number of individual mobile stations in the area is counted and notified to the network control station 44, the present invention is not limited to such a cycle. For example, in a non-congestion state, the cycle is set long, Home memory station 42 and network control station 44
It is also possible to these mobile switching center 81 _{1-81 4} counts the number of similar, and informs the network controller 44 in response to polling performed under the initiative.

Further, in each of the above-described embodiments, the necessity of restricting the call processing is uniformly determined according to the number of mobile stations located in a plurality of subordinate wireless zones. The present invention is not limited to the configuration.For example, if a wireless zone that is not in a congested state can also be subject to regulation, the traffic control method according to the present invention is not applied, and a method in which regulation is performed in units of wireless zones is used as appropriate. May be done.

[0059]

As described above, according to the first aspect of the present invention, the number of mobile stations located within the communication area does not fluctuate significantly according to channel switching or location registration during a call. As long as it can be considered that the traffic increases as the number increases, an excessive congestion state can be prevented in the unit of the mobile communication switching center without performing complicated monitoring of traffic adapted to entry and exit for each wireless zone.

According to the second aspect of the present invention, a means for monitoring the number of serving mobile stations in the wireless zone under the control of each switching station is not added to the existing home memory station or the higher-ranking station. In the same manner as in the traffic control method according to the first aspect, an excessive congestion state is prevented for each exchange. According to the third aspect of the present invention, an excessively congested state is prevented in the same manner as in the traffic control method according to the first aspect, under a network configuration adapted to the level of the station.

According to the fourth aspect of the present invention, for a mobile station having a subscriber class whose call processing priority is lower than that of the priority mobile station, the resources to be preferentially allocated to the call generated in the priority mobile station described above. , Call processing is regulated, and an excessive congestion state is prevented for each switching center in the same manner as in the traffic control method according to any one of claims 1 to 3.

According to the fifth aspect of the present invention, it is possible to shorten the time required to enter a congestion state when the traffic volume increases rapidly and to promote the departure from the congestion state. According to the invention described in claim 6, a decrease in service quality due to a large proportion of roaming mobile stations occupying mobile stations located in the own station is suppressed. According to the seventh aspect of the present invention, a decrease in service quality caused by a large proportion of mobile stations belonging to another communication carrier among mobile stations located in the own station is suppressed.

Therefore, in a network to which these inventions are applied and which is connected to a mobile communication system, congestion control and traffic control adapted to the congestion control are performed without complicating processing and increasing the scale of hardware. In addition, a significant decrease in service quality under such traffic control is avoided without increasing costs.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the principle of the present invention.

FIG. 2 is a diagram showing an embodiment corresponding to the invention described in claims 1 to 7;

FIG. 3 is an operation flowchart of a mobile communication switching center in the present embodiment.

FIG. 4 is an operation flowchart of a home memory station in the embodiment.

FIG. 5 is an operation flowchart of a network control station in the present embodiment.

FIG. 6 is a diagram for explaining the operation of the present embodiment corresponding to the first to third aspects of the present invention;

FIG. 7 is a diagram illustrating a configuration of a number-of-residents table.

FIG. 8 is a diagram showing a configuration of a regulation control register.

FIG. 9 is a diagram illustrating an example of a conventional traffic control method.

FIG. 10 is a diagram illustrating an operation of a conventional example.

[Explanation of symbols]

 11, 81 Mobile communication switching station 12 Switching station 13 Residing mobile station monitoring means 14 Status notifying means 41, 43, 45 Communication link 42 Home memory station 44 Network control station 61 Number of resident persons table 62 Regulation control register 82 Public network

Claims (7)

[Claims] 1. A wireless zone formed by one or a plurality of wireless base stations, and performs a call process for a call generated by a mobile station located in cooperation with the wireless channel setting control performed by these wireless base stations. A mobile station that has performed entry and exit, and a mobile communication exchange that detects the congestion state of its own station and escape from the congestion state, and a network or inter-station transmission path to the mobile communication exchange. An exchange that is connected through the mobile communication exchange and performs call processing as a source or a relay of the call while coordinating with the call processing performed by the mobile communication exchange. The mobile station monitoring means for obtaining the number of mobile stations in the area by taking the difference between the number of mobile stations that performed the mobile station and the mobile station in which the mobile station has performed the area. Is a preset lower limit A status notifying unit that determines whether or not the congestion state is detected by the mobile communication switching center, and notifies a result of the determination to the switching center. A traffic control method comprising: means for restricting call processing of a call destined to the mobile communication switching center when a result of the determination notified by the notification means is true. 2. The traffic control system according to claim 1, wherein all or a part of the exchanges perform call processing while cooperating with radio channel setting control in the same manner as the mobile communication exchanges, and perform a call entry process. A mobile station that has gone out of service and a means for detecting a congestion state of the own station and a departure from the congestion state; and a serving mobile station monitoring means, the mobile communication switching station, and And a switching center having the above means. 3. The traffic control system according to claim 1, wherein all or a part of the exchanges perform call processing in cooperation with radio channel setting control in the same manner as the mobile communication exchanges, and perform a call entry process. The mobile station that has gone out of service has a means for detecting the congestion state of the mobile station and its own station and departure from the congestion state.The serving mobile station monitoring means includes: a mobile communication switching center; A traffic control system provided in a station of a higher rank than an exchange having said means. 4. The traffic control system according to claim 1, wherein the mobile communication switching center has a higher priority for call processing among mobile stations located within the mobile communication switching center. The number of priority mobile stations having the caller class is determined, the presence or absence of resources required for call processing is determined for calls occurring simultaneously to all of these priority mobile stations or to a predetermined ratio of priority mobile stations. A traffic control method for detecting a false state as a congestion state. 5. The traffic control system according to claim 1, wherein the mobile communication switching center responds to the congestion state in ascending order of the number of mobile stations located in the mobile station. A traffic control method characterized by having means for discriminating calls to be processed and thinning out the calls to be processed at a higher rate as the degree of the calls is higher. 6. The traffic control system according to claim 5, wherein the mobile switching center determines whether or not the home area of the mobile station where the call originated is the service area of the mobile station. A traffic control method characterized in that it has means for judging under coordination or based on a call processing procedure and, when the result of the judgment is false, expanding the rate of thinning out of the calls to be processed. . 7. The traffic control system according to claim 5, wherein the mobile communication switching center controls the radio channel setting for the mobile station on which the call originated, as to whether or not the associated carrier is the operator of the mobile station. Characterized in that it has means for judging under the coordination with or based on a call processing procedure, and when the result of the judgment is false, expanding means for thinning out the calls to be processed. control method.