Telecommunications – Radiotelephone system – Security or fraud prevention
Reexamination Certificate
1998-07-29
2001-05-15
Le, Thanh Cong (Department: 2684)
Telecommunications
Radiotelephone system
Security or fraud prevention
C455S435100, C455S445000
Reexamination Certificate
active
06233447
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mobile communication system, particularly relates to a mobile communication system and a method for restricting incoming calls when a particular mobile communication exchange is under traffic congestion state.
2. Description of the Related Art
A block diagram of constitution of a general mobile communication system focusing to a network side is shown in FIG.
3
.
A location register
31
, which manages location information and subscriber information of each mobile station
34
, is respectively connected to mobile communication exchanges
32
and
33
for call connecting processing via a common channel signaling network
35
and information required for the processing of an incoming call to each mobile station
34
is mutually communicated via the common channel signaling network
35
. Although radio base stations and radio base station control units are not shown in drawings, it is assumed that they are part of the mobile communication exchange
32
,
33
.
In this type of mobile communication system, if the traffic of a specific mobile communication exchange has increased and congestion state occurs, the specific mobile communication exchange is relieved from such a congestion state by restricting an incoming call to the above mobile communication exchange from other mobile communication exchanges and restricting or denying a call origination request from mobile stations under control of the mobile communication exchange through radio base stations (not shown).
FIG. 4
is a sequence diagram showing a conventional type incoming call control method.
Suppose that the mobile communication exchange
33
which controls the mobile station
34
is in a state of congestion.
At this time, when one of the mobile communication exchanges of the mobile communication network, e.g. the mobile communication exchange
32
, receives a request
40
for call termination to the mobile station
34
, which is under control of the mobile communication exchange
33
, the mobile communication exchange
32
sends an incoming call information reading request
41
to the location register
31
through the common channel signaling network
35
.
The mobile communication exchange
32
acquires the location information of the mobile station
34
based upon an incoming call information reading response
42
returned from the location register
31
in response to the above request.
The mobile communication exchange
32
recognizes that the mobile station
34
is located in area under control of the mobile communication exchange
33
, and sends a request for call termination
43
to the mobile communication exchange
33
.
On the other hand, the mobile communication exchange
33
receives the request
43
for call termination to the mobile station
34
, however, as the mobile communication exchange
33
itself is in a state of congestion, the mobile communication exchange
33
returns an incoming call denying signal
44
to the mobile communication exchange
32
. Hereby, processing for the call in the mobile communication exchange
32
is interrupted, and the call is treated as a call loss.
However, in such a conventional type mobile communication system, as processing for an incoming call to a mobile station located in an area under control of a mobile communication exchange, which is in a state of congestion, is advanced up to the mobile communication exchange, and the incoming call request is denied by the mobile communication exchange. That is, the mobile communication exchange in a state of congestion is required to execute processing for denying the incoming call. Therefore, such processing for rejecting the incoming call by the mobile communication exchange in a state of congestion causes a problem that a mobile communication exchange in a state of congestion is prevented from recovering from the congestion.
To solve the above problem, Japanese Patent Publication Laid-open No. Hei 3-42950 discloses a technology that incoming calls to an exchange in a state of congestion are rejected at an exchange of the preceding stage which is notified by the exchange in a state of congestion that the exchange is currently being in a state of congestion. Hereby, as incoming calls to an exchange in a state of congestion are restricted at the preceding exchange, the above problem can be solved, however, there is a problem that wasteful processing for incoming calls routed up to the preceding exchange cannot be reduced.
SUMMARY OF THE INVENTION
The present invention is made to solve such problems and therefore has an object to provide a mobile communication system which can restrict incoming calls to an exchange in a state of congestion and can omit wasteful processing for connecting to a restricting exchange.
To achieve such an object, a mobile communication system according to the present invention is constituted so that a location register stores incoming call restricting exchange information showing a mobile communication exchange which is under incoming call restricting state; and a mobile communication exchange, when received a call request, acquires a mobile station information including location information and incoming call restricting exchange information to the location register for the received call request, and verifying whether the call terminating process being allowed or not in accordance with the query result.
In more detail, the location register according to the present invention comprises an incoming call restricting exchange information storage section for storing an exchange information showing a mobile communication exchange is under incoming call restricting state due to traffic over load condition or like, and the mobile communication exchange comprises an incoming call judging section for judging whether a call to a mobile station is allowed or not by referring to information including location information of the mobile station and incoming call restricting exchange information obtained from the location register.
Therefore, each mobile communication exchange comprises means for detecting traffic state of own exchange and instructing the traffic congestion state to the location register, and means for judging whether a call to a mobile station is allowed or not according to information obtained from the location register when a call request has been received, and means for interrupting call processing in accordance with a result of judgement which has judged that the mobile station was located in a control area of the mobile communication exchange indicated by the incoming call restricting exchange information.
A method of incoming call restriction for a mobile communication system according to the present invention comprises the following steps;
(1) instructing the location register to store an incoming call restricting exchange information when traffic state of a mobile communication exchange exceeding a predetermined value for rejecting incoming calls to mobile stations located in own control area:
(2) storing the incoming call restricting exchange information in the location register showing that a mobile communication exchange is under incoming call restricting state;
(3) acquiring information to the location register when a mobile communication exchange has received a call request to a mobile station;
(4) judging whether a call to the mobile station is allowed or not according to information from the location register including location information of the mobile station and incoming call restricting exchange information; and
(5) interrupting call processing when it has judged the mobile station is locating in a control area of the mobile communication exchange indicated by the incoming call restricting exchange information.
REFERENCES:
patent: 6085084 (2000-07-01), Christmas
patent: 3-42950 (1991-02-01), None
Cong Le Thanh
McGuireWoods LLP
NEC Corporation
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