Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1994-06-17
1997-07-15
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
H04B 724
Patent
active
056493010
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a communication control method in a mobile communication system which enables a subscriber to originate or terminate a call through any given mobile unit in an arbitrary mobile communication network through utilization of his personal number.
PRIOR ART
In mobile communication, a location register is provided in the mobile radio communication network and is covered by a plurality of base stations in the network. Even if a mobile unit freely moves across a plurality of areas, its visited area is always updated in the location register. Hence, when receiving a terminating call for a mobile unit anywhere in the mobile communication network, a switching center is capable of terminating the call at its destination unit by reading out its visited area from the location register, sending the call to the base station of that area and transmitting it therefrom to the mobile unit over a radio channel. With this method, however, users suffer an inconvenience that they are allowed to receive terminating calls only by their own mobile units.
It is now demanded to implement a mobile communication system wherein each subscriber registers his service information with the mobile communication network whenever necessary and the network effects call control for the subscriber by referring to his registered service information to allow him to use an arbitrary mobile unit for communication. Where the area over which the mobile communication service is offered is made up of a plurality of mobile communication networks by different service providers, it will be convenient that the subscriber belonging to one of the mobile radio communication networks is allowed to originate and terminate calls in the other networks as well. To meet this requirement, there has been proposed such a system as described below. In the following description, the mobile communication network to which the subscriber belongs will be referred to as a home network and the mobile communication network into which the subscriber moves from the home network will be referred to as a roaming network.
Every mobile unit (a portable telephone or car phone, for example) receives services specified in the contract with the company operating the mobile communication network. To carry out the services, each mobile unit is assigned a mobile unit identifying number and various pieces of information on the mobile unit, similar to those mentioned above, are prestored in the location register in the network to which the subscriber belongs. To receive call originating and call incoming services in a mobile communication network to which the mobile unit does not belong, that is, in the roaming network, it is necessary to access the mobile unit contract information and other similar information, but it is inefficient to access the home network for each call; it is customary in the prior art to transfer hence, all or some pieces of mobile unit contract information and similar information from the location register of the home network to the counterpart of the roaming network.
Conventionally, when the subscriber roams into a mobile communication network other than the home network, his fixed and unmodified contract information (including information about the subscriber and information about the mobile unit) is transferred from a visitor location register of the home network to the counterpart of the roaming network. In the roaming network, at the time of performing the call originating and terminating process for the subscriber, his contract information is referred to in the visitor location register of the roaming network to permit a mobile originated or terminated call in the roaming network. However, no proposals have been made regarding how effect changes of service such as incoming call forwarding, call waiting and temporary interruption of incoming call.
In the implementation of a communication system (a personal mobile communication system) which allows the subscriber to originate a call or receive an incoming call thro
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Hirata Shoichi
Maruyama Yasuo
Nakamura Hiroshi
Takemoto Eriko
Tsukahara Hiroshi
Eisenzopf Reinhard J.
Nguyen Lee
NTT Mobile Communications Network Inc.
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