JPH04311198A - System for selecting mobile body call controlling exchange - Google Patents

Abstract

PURPOSE:To select a mobile body exchange having low control part using efficiency as a mobile body call controlling exchange when plural body exchanges for calling mobile body to be called exist in the mobile body call control exchange selecting system for a mobile body communication system. CONSTITUTION:In the mobile body communication system for selecting a mobile body call controlling exchange out of plural mobile body exchanges 2-1 to 2-j having the same calling area by means of a gate exchange 1 and allowing the selected exchange to execute the call control of mobile bodies to be called, an exchange efficiency transmitting means 3 for periodically transmitting the using efficiency of a control part in each mobile body exchange is included in each mobile body exchange and an exchange function storing means 4 for receiving and storing using efficiency information and a mobile body call controlling exchange selecting means 5 for selecting a mobile body exchange having low using efficiency out of the plural mobile body exchanges sharing the calling area of the mobile body concerned as a mobile body call controlling exchange at the time of receiving a connection request to the mobile body are included in the gate exchange 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a selection method for a mobile call control switch in a mobile communication system.

[0002] In recent years, public mobile communication systems such as car telephone systems and mobile telephone systems are rapidly expanding. In response to the expanding demand for mobile communications, it has become an important issue to effectively utilize frequencies for mobile communications. ing. In the small zone system, multiple mobile telephone exchanges (hereinafter referred to as AMS) share the area where all calls are made (hereinafter referred to as the calling area). A method is used in which an AMS that takes the lead in call control is selected from among the AMSs to control calls and connections. The AMS that takes the lead in this call control is called a mobile call control switch. Note that paging and switching stations (mobile call control stations) that function as mobile call control exchanges
Although called a pilot station (PP station), hereinafter, both the mobile call control exchange and the mobile call control station will be referred to as a PP station.

[0003] In the example of a car telephone system, a connection from a fixed communication network to a mobile unit is first made to a gateway station of the mobile communication network. The gateway station checks the calling area in which the called mobile object exists in the home memory station where the mobile object's location is registered, and makes a simultaneous call to that area. The home memory station notifies the AMS in charge of the wireless zone where the called mobile unit is likely to exist based on the latest communication records.
If the gateway station can secure a line between the notified AMS and the gateway exchange, the PP station determines the notified AMS and takes the lead in calling and connection control for the mobile unit.

[0004] When the location of the mobile body moves to another wireless zone while communicating with the mobile body via the PP station, and the AMS that controls the connection with the mobile body changes accordingly. In this case, the gateway station switches the PP station to another AMS and also changes the connection route.

[0005] However, recently, even if the mobile station leaves its own radio zone, a system has been developed in which the selected PP station continues to control the connection and continues communication via another switching station. It has appeared. In this case, the AMS of the PP station increases the amount of connection control processing, but in the conventional technology, the selection of the PP station does not depend on whether the AMS processing is congested or not, so the usage efficiency of the control unit is high. There is a possibility that AMS will be selected as the PP station, causing trouble in connection processing.

[0006] Therefore, there is a need for a mobile paging control exchange selection system that selects a PP station while taking into account the usage efficiency of the AMS control unit.

[0007]

2. Description of the Related Art FIG. 4 is a block diagram of a mobile communication system, and FIG. 5 is a diagram showing a procedure for selecting a mobile call control exchange according to the prior art.

FIG. 4 shows a configuration diagram of a mobile communication system using an example of a car telephone system, and FIG. ) illustrates the selection procedure. Below, FIG. 4 and FIG. 5 will be explained together. In addition, S21
~S29 are symbols indicating each step in FIG.

In FIG. 4, a calling party 31 of a fixed communication network 30
When the user dials the automated telephone number as the mobile identification number, the mobile communication network 2
It is connected to the barrier station 23 of 0 (S21), and the barrier exchange (
MGS) 21 receives the automated telephone number.

The gateway switch 21 transfers the received telephone number to the home memory station 26 which stores mobile subscriber information.
The mobile subscriber 29 inquires about the location information of the mobile subscriber 29 having the corresponding telephone number (S22). Home memory station 2
In step 6, the information stored in the mobile subscriber file 27 is searched, and information on areas where there is a high possibility that the mobile subscriber 29 exists is returned as calling area information LI, and at the same time, information on areas where there is a high possibility that the mobile subscriber 29 exists is returned. The identification number NPC of the AMS (Automatic Telephone Switching System) in charge of the wireless zone (not shown) with high security is returned (S23). Above L
I and NPC are obtained from the location information of the last communication with the mobile subscriber 29 or the latest location registration information sent from the mobile subscriber 29, and LI is obtained from multiple A
This is information indicating the range of simultaneous paging from the MS.

[0011] When the gateway switch 21 obtains the LI and NPC from the home memory station 26 (S24), it receives the corresponding A from the NPC.
Search the line group number (trunk group number, hereinafter referred to as TGN) for the MS, for example, AMS15-1 (hereinafter referred to as AMS1. The same applies to other AMS), and select the corresponding TG.
An operation is performed to select a vacant line within N (S25). As a result, if a free line is obtained, that TGN line is determined as the line between the barrier station 12 and the AMS 1 (S26,
S28), the AMS1 station is determined to be the PP station (S29)
).

[0012] If there is no free line in the TGN for AMS1, T
Check whether there are free lines within the GN (S26, S27
). If a free line is available on the TGN to the detour destination AMS,
The AMS to which the line group is set, for example AMS2, is determined as the PP station (S26, S28, S29).

[0013] The AM determined as the PP station as described above
For example, if S is AMS1, AMS1 is another AMS2.
~ Call area 2 that also controls AMSJ and is determined by LI
8-1 to call all at once.

As described above, in the prior art, the home memory station can become a PP station from the location of the mobile unit.
Therefore, the notified AMS is determined to be the PP station, unless the line for this AMS cannot be secured because it is busy or the like.

[0015]

[Problems to be Solved by the Invention] In the conventional technology, when connecting to a mobile unit, the home memory station notifies the AMS that is likely to be a PP station based on the latest location information of the mobile unit. , the probability that a particular AMS will be determined as a PP station increases, and the AMS
There is a problem that the load between the two is unbalanced. In particular, in a system in which a PP station tracks mobile units and controls connections, the load on a particular AMS becomes excessive, which may cause congestion in the mobile exchange.

SUMMARY OF THE INVENTION An object of the present invention is to select a mobile exchange with a low usage efficiency of the control section as a mobile call control exchange when there are a plurality of mobile exchanges that call a called mobile.

[0017]

[Means for Solving the Problems] FIG. 1 is a diagram illustrating the principle of the present invention. In the figure, 1 is a gateway switch installed at a barrier station (not shown) of a mobile communication network, 2-1 to 2-j are a plurality of mobile switches having the same calling area, and 3 is each mobile switch 2- 1 to 2-j, mobile exchanges 2-1 to 2
4 and 5 are provided in the barrier exchange 1; 4 and 5 are provided in the barrier exchange 1; Exchange function rate storage means 5 receives and stores usage efficiency information of the control unit of the mobile exchange transmitted from 3; mobile switching equipment 2-1~2
- mobile call control exchange selection means for inputting and comparing the usage efficiency of the control unit of j from the switching function rate storage means 4 and selecting a mobile exchange with a lower usage efficiency of the control unit as the mobile call control exchange; be.

[0018]

[Operation] In FIG. 1, each of the switching function rate transmitting means 3 in the mobile switching equipment 2-1 to 2-j is connected to the mobile switching equipment 2-j.
The usage efficiency of the control units 1 to 2-j (not shown) is received from the control units and periodically transmitted to the barrier exchange 1.

In the gateway exchange 1, the exchange function rate storage means 4 stores the usage efficiency information of the control section of the mobile exchange sent from the exchange function rate transmission means 3 of the plurality of mobile exchanges 2-1 to 2-j. Receive and store.

[0020] When a connection request to a mobile unit is made to the gateway exchange 1, the gateway exchange 1 obtains the location information of the called mobile unit by means not shown, and calls the mobile unit to make a simultaneous call to that location. Check exchanges 2-1 to 2-j.

[0021] Mobile switchboards 2-1 to 2 that perform simultaneous paging
-j is confirmed, the mobile call control exchange selection means 5
inputs the utilization efficiency information of the control units of the corresponding mobile exchanges 2-1 to 2-j from the exchange function rate storage means 4, and selects the mobile exchange with the lowest utilization efficiency as the mobile call control exchange; Take control of subsequent calls and connections to the mobile.

[0022] As described above, the mobile exchanges 2-1 to 2-j
are selected as mobile call control exchanges in order from the one with the lowest usage efficiency of the control unit, so the usage efficiency of the control unit of each mobile exchange is equalized, and for example, mobile units are concentrated around a specific mobile exchange. Even in such cases, there is no possibility that only a specific mobile exchange is congested.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a diagram showing a procedure for selecting a mobile call control exchange according to an embodiment of the present invention.

In FIG. 2, the same objects as in FIG.
W), 1b is also a control unit, 4, 5, 10, and 11 are provided in the control unit 1b, and 4 is a replacement function rate storage unit (RM).
, 5 is a mobile paging control switch selection unit (PPS), 10 is a connection processing unit, and 11 is a line group selection unit (TGN).

[0025] 3, 12, 13 are mobile switching equipment 2-1~
2-j, 3 is an exchange function rate transmitter (TE);
12 is a communication path network (NW), 13 is a control unit (C
C). Further, 6 is a home memory station, 7 is a mobile subscriber file provided in the home memory station 6 and stores mobile subscriber information, and 8 is a mobile switch 2-1 to 2-.
9 is a mobile subscriber, and 14 is a wireless base station (MBS).

[0026] FIG. 2 shows one of the plurality of calling areas.
Only one area is described, and the description of the mobile switching system that makes a call to the not-illustrated calling area is also omitted. Hereinafter, FIGS. 2 and 3 will be described together, and S1 to S11 are symbols for each step in FIG. 3.

In FIG. 2, each mobile switch 2-1 to 2-2
-j periodically outputs the usage efficiency of each control unit 13 to the exchange function rate transmission unit 3, and the exchange function rate transmission unit 3 stores the received usage efficiency information of the control unit 13 in the exchange function rate storage of the barrier exchange 1. Send to Department 4. As a result, the switching efficiency storage section 4 stores the latest utilization efficiency information of the control section 13 of each of the mobile exchanges 2-1 to 2-j.

In the above state, for example, when a connection request is made from a fixed communication network (not shown) to a mobile subscriber (for example, a car phone) 9 (S1), the number of the mobile subscriber 9 to be connected is transferred to the gateway exchange. 1 is sent to the control unit 1b. The connection processing unit 10 of the control unit 1b sends the received number of the mobile subscriber 9 to the home memory station 6 and inquires about the current location of the mobile subscriber 9 (S2).

Mobile subscriber file 7 of home memory station 6
records the latest location registration information sent by the mobile subscriber or the location information from the last communication by the mobile subscriber, so when an inquiry for location information is received from barrier switch 1, the above information is recorded. The mobile subscriber file 7 is searched and information LI identifying the calling area of the mobile subscriber 9 is returned (S3).

When the connection processing unit 10 of the barrier switch 1 receives the paging area information LI (S4), it activates the mobile call control switch selection unit 5. The mobile call control exchange selection unit 5 first selects the call area information LI by means not shown.
The mobile switching system that makes the call to the calling area is confirmed (S5). For example, if the calling area specified by the identification information LI is calling area 8 in FIG.
j is confirmed. When this is confirmed, the mobile call control exchange selection section 5 accesses the switching efficiency storage section 4, inputs and compares the usage efficiency information of the control sections 13 of all the mobile exchanges 2-1 to 2-j. For example, if the usage efficiency of the mobile switch 2-1 is 30%, which is the lowest, the mobile call control switch selector 5 selects the mobile switch 2-1 as the mobile call control switch (PP station) for the mobile subscriber 9. , and notifies the connection processing unit 10 (S6).

When the connection processing unit 10 obtains this information, it accesses the line group selection unit 11 and selects an empty line in the line group for the mobile exchange 2-1, and connects the communication path network 1a and the mobile exchange 2. A direct line is set between the communication path networks 12 of -1 (S7, S8, S10). As a result, the mobile switch 2-1 is determined to be the mobile call control switch (S11).

Thereafter, the mobile exchange 2-1 controls its own exchange as well as the other mobile exchanges 2-2 to 2-j to make a simultaneous call to the paging area 8, but this call is sent to each mobile 1 connected to exchanges 2-1 to 2-j
Alternatively, it is performed via a plurality of wireless base stations 14.

When the connection processing unit 10 accesses the line group selection unit 11, if there is no free line in the line group for the mobile exchange 2-1, the connection processing unit 10 moves to the mobile call control exchange selection unit 5. Next to the mobile switching device 2-1, the mobile switching device having the lowest control unit usage efficiency is queried. For example, if the usage efficiency of the control unit 13 of the mobile exchange 2-j is 40%,
If the usage efficiency is the second lowest after the mobile exchange 2-1, the mobile call control exchange selection unit 5 has the second lowest usage efficiency after the mobile exchange 2-1.
The connection processing unit 10 is notified that j has been selected as the mobile call control exchange (S7, S8, S9), and the line selection is performed in the same manner as above, and if a line is obtained, the mobile call control exchange 2-j is determined as the mobile call control exchange (S7 to S11).

As described above, in the mobile call control switch selection method of the present invention, the mobile switchboards 2-1 to 2-j are selected as mobile call control switches in order from the one with the lowest usage efficiency of the control section. , the usage efficiency of the control unit of each mobile exchange is equalized, and there is no possibility that only a particular mobile exchange is congested.

[0035] Furthermore, in a system in which a mobile call control switch continues to control connection to a mobile station that has moved out of the wireless zone belonging to its own switch, the processing amount of the mobile call control switch increases; however, in the present invention, the above-mentioned Since mobile call control exchanges are selected from those with lower control unit usage efficiency, such as mobile call control exchanges, it is possible to avoid excessive overload of the mobile call control exchange selected as the mobile call control exchange than other mobile exchanges. It will be done.

Although the embodiment of the present invention has been described above with reference to FIGS. 2 and 3, FIGS. 2 and 3 merely show one embodiment of the present invention. It goes without saying that the procedure is not limited to only the procedure shown in FIG. For example, in FIG. 2, the connection processing unit 10, switching capacity storage unit 4, mobile call control exchange selection unit 5, and line group selection unit 11 in the control unit 1b of the barrier switch are shown as separate structures. However, it is clear that the effects of the present invention will not change even if these components are combined as appropriate depending on the configuration of the barrier switch. In addition, in FIG. 2, the switching function rate transmitting unit 3 is the mobile switching equipment 2-1 to 2-2-.
However, it may be installed outside the mobile exchange within the station where the mobile exchange is installed.

Furthermore, in the above explanation, the barrier exchange 1
connects to a mobile unit in response to an incoming call from a fixed communication network, but the present invention can also be applied when the gateway switch 1 controls connections between mobile units as a relay switch within a mobile communication network. It is clear that

[0038]

[Effects of the Invention] As explained above, according to the present invention,
The mobile call control exchange that performs call control for mobile units is selected from among multiple mobile exchanges with the same paging area, based on the one with the lowest usage efficiency of the control unit, so the usage efficiency of the control unit of each mobile exchange The traffic is leveled out, and there is no possibility that only a specific mobile exchange is congested. Therefore, even if mobile bodies are concentrated in a radio zone belonging to a particular mobile exchange, the mobile exchange will not be congested, and connections to the mobile bodies will be made smoothly. Furthermore, even in a system in which a mobile call control switch continues to control connections for mobile devices that have moved outside the radio zone belonging to its own switch, if the mobile switch selected as the mobile call control switch is faster than other mobile switch Extreme overload can be avoided.

That is, the present invention provides a mobile switching system in a mobile communication system in which a mobile call control switch is selected from among a plurality of mobile switchboards having the same paging area and takes the lead in controlling paging for a called mobile unit. It has a remarkable effect on leveling usage efficiency and preventing congestion.

[Brief explanation of drawings]

[Figure 1] Diagram explaining the principle of the present invention

[Figure 2] Embodiment configuration diagram of the present invention

[Fig. 3] Mobile call control switch selection procedure diagram according to the embodiment of the present invention

[Figure 4] Mobile communication system configuration diagram

[Fig. 5] Prior art mobile call control switch selection procedure diagram

[Explanation of symbols]

1　Kanmon exchange machine 2-1 to 2-j Mobile switching equipment 3 Exchange function rate transmission means 4 Exchange function rate storage means 5 Mobile call control exchange selection means

Claims (1)

[Claims] [Claim 1] The connection to the mobile unit is provided by a gateway exchange (1
), and the barrier switch (1) is connected to multiple mobile switches (2-1 to 2-2) having the same paging area.
j) In a mobile communication system in which a mobile call control switch is selected from among the above to take the lead in call control for a called mobile unit, each mobile switch (2-1 to 2-j)
a switch function rate transmitting means (3) for receiving the usage efficiency of the control unit of each mobile switch (2-1 to 2-j) and periodically transmitting it to the barrier switch (1); In the barrier exchange (1), the exchange function rate transmitting means (3)
exchange function rate storage means (4) for receiving and storing the utilization efficiency information of the control unit of the mobile exchange transmitted from the mobile exchange; Multiple mobile exchanges (2-1~
2-j) Mobile call control in which the usage efficiency of the control unit is inputted from the switching function rate storage means (4) and compared, and the mobile exchange with the lower usage efficiency of the control unit is selected as the mobile call control exchange. A mobile call control exchange selection method comprising: exchange selection means (5).