Multiplex communications – Communication over free space – Combining or distributing information via time channels
Patent
1996-08-29
1999-10-05
Nguyen, Chau
Multiplex communications
Communication over free space
Combining or distributing information via time channels
455456, H04L 1256
Patent
active
059635509
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a packet transfer scheme for transferring a packet at a high speed in a mobile communication and a packet mobile communication system using this transfer scheme.
BACKGROUND ART
FIG. 13 shows a construction of a conventional packet communication network in a mobile communication, and FIG. 14 shows a control sequence diagram employed in this construction.
In FIG. 13, a packet switch 110 includes a signal processor 111. This signal processor 111 is interconnected with an external packet switch (for . Upon receipt of a packet addressed to one of the mobile terminals within the network, the signal processor 111 transfers the packet to a packet switch 120. This packet switch 120 includes a subscriber information memory 122 in which subscribers information of the individual mobile terminals is stored. The subscriber information includes identification numbers of the individual mobile terminals, service information indicating the contents of services (for example, whether the individual mobile terminals subscribe to the packet service or not) for the individual mobile terminals, location information showing the zones where the individual mobile terminals are currently located.
The signal processor 121 included in the packet switch 120 reads the subscriber information of the mobile terminal 40 as the address of the packet from the subscriber information memory 122 and makes a judgment as to whether or not a service can be offered to the mobile terminal 40, based on the service information stored in the subscriber information memory 122. If the judgment result is affirmative, the signal processor 121 transfers the packet to a packet switch 30 corresponding to the zone shown in the location information. Although FIG. 13 shows only one packet switch 30, actually, a number of similar packet switches are installed and administrate their own zones, respectively.
With the above-mentioned arrangement, however, it was difficult for other communication methods (for example, voice communication method) to commonly use the contents of the subscriber information memory 122 because the subscriber information memory 122 is installed within the packet-specific switch 120. Another problem was that since the packet transferred from the external packet switch must be transferred to the mobile terminal 40 essentially via at least three packet switches, the transmission speed is decreased.
DISCLOSURE OF INVENTION
The present invention was made in view of the above-mentioned problems. It is, therefore, an object of the present invention to provide a packet transfer scheme and a mobile communication system in which various data can easily be used commonly with other communication methods and a packet can be transferred at a high speed.
To achieve this object, from one aspect of the present invention, there is provided packet transfer scheme used in a mobile communication system comprising a database for storing an identification number of a mobile terminal and location information showing a zone in which the mobile terminal is currently located and for rewriting the location information in accordance with a request from the mobile terminal, a first packet switch, and a second packet switch capable of communicating with the mobile terminal in case the mobile terminal is located in a zone under the second packet switch, the packet transfer scheme being characterized in that: information when the first packet switch receives a packet addressed to the mobile terminal; in response to the inquiry; case the location information indicates the zone under the second packet switch; and the second packet switch receives the packet from the first packet switch.
With this construction, the first packet switch inquires of the database about location information of a mobile terminal as a destination address of a packet received by the first packet switch. In response to the inquiry, the database provides the location information to the first packet switch. In case this location information indicates a zon
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Hirata Shoichi
Ikeda Kimio
Nakajima Akihisa
Shimokawa Atsushi
Sotoyama Masumi
Nguyen Chau
NTT Mobile Communications Network Inc.
Vanderpaye Kenneth
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