Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2000-07-07
2004-08-03
Nguyen, Chau (Department: 2663)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S468000
Reexamination Certificate
active
06771618
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a packet transfer method and system. More particularly, it relates to a system and method for controlling packet data transfer in mobile data communication.
Conventionally, packet transmission in a mobile communication system will be described with reference to FIG.
11
. The mobile communication system includes a plurality of terminals
110
a
-
110
c
, a base station
120
connected to the terminals
110
a
-
110
c
via wireless lines, and a switching center
130
linked to the base station
120
via wire lines. The switching center
130
is connected to a network
140
, which is one type of a public network of PSTN (Plain Service Telephone Network). Each of the terminals
11
O
a
-
110
c
includes an information terminal unit and a mobile unit such as a PHS or cell phone terminal linked to the information terminal unit.
The wire line for interconnecting the base station
120
and the switching center
130
includes a shared channel and a dedicated channel. The shared channel can be shared by the multiple terminals, while the dedicated channel can exclusively be used by one of the terminals.
When a quantity of data transferred from the terminal is equal to or greater than a predetermined value, then the dedicated channel is allocated to the terminal, thereby allowing the data transferred from the terminal to be transferred through the dedicated channel.
However, in such a conventional data communication system, an enormous volume of data as well as poor quality of transmission is likely to bring about delay in data or discard of data, with concomitant reductions in processing ability and service quality in the base station and the switching center.
In view of the above problem, an object of the present invention is to provide a packet transfer method and system adapted to minimize delay in data and discard of data in the mobile communication system, and thus to provide improvements in processing ability and service quality in the base station and the switching center.
SUMMARY OF THE INVENTION
The above objective of the present invention is achieved by a data transfer method in a mobile data communication system including a mobile terminal, a base station communicated to the mobile terminal by wireless, and a switching center connected to the base station via a wire line, comprising that, when a quantity of data residing in a dedicated channel of the wire line between the base station and the switching center exceeds a predetermined. value, the dedicated channel being exclusively allocated to the mobile terminal, then a further dedicated channel is allocated to the mobile terminal, thereby transmitting the data through the multiple dedicated channels.
Further, the objective of the present invention is achieved by a data transfer method in a mobile data communication system including a mobile terminal, a base station communicated to the mobile terminal by wireless, and a switching center connected to the base station via a wire line, comprising that, when a quantity of data residing in a dedicated channel of the wire line between the base station and the switching center exceeds a predetermined value, the dedicated channel being exclusively allocated to the mobile terminal, then a shared channel to be shared by the multiple mobile terminals is applied to the mobile terminal, thereby transmitting the data through the shared channel and the dedicated channel.
A mode for carrying out the present invention will now be described. A communication system embodying the present invention includes a plurality of terminals, a base station connected to the terminals via wireless lines, and a switching center linked to the base station via a plurality of wire lines. The wire line includes a shared channel and a dedicated channel in which the shared channel can be shared by the terminals, while the dedicated channel can be used by only one of the terminals.
A packet transfer method in the communication system permits data transferred from the terminal to be transferred by packets in which the data are separated by a certain length. When a quantity of data transferred from the terminal is equal to or greater than a predetermined value, then the packet transfer method allocates the dedicated channel to the terminal, thereby permitting the data transferred from the terminal to be transferred through the dedicated channel. In the packet transfer method according to the present invention, in data transfer through the dedicated channel that is allocated to the terminal, when data transferred from the terminal is waited because of an excessive quantity of such transferred data, and further when a queuing data quantity of the data is equal to or greater than a predetermined delay data quantity-generating value, then another dedicated channel (hereinafter called an “additional dedicated channel”) is allocated to the terminal, thereby transferring the data through the dedicated channel and the additional dedicated channel until the queuing data quantity is equal to or less than a predetermined delay data quantity-restoring value.
Processing to allocate the additional dedicated channel according to one embodiment of the present invention includes the following steps:
At step S
1
, the base station determines whether a queuing data quantity of data transferred from the terminal is equal to or greater than a delay data quantity-generating value. When the determination results in “YES”, then the base station requests the switching center through the shared channel to allocate the additional dedicated channel to the terminal.
At step S
2
, the switching center determines upon receipt of such a request from the base station whether the additional dedicated channel can be allocated to the terminal. Then, the switching center delivers the result of the determination to the base station through the shared channel.
At step S
3
, the base station allocates the additional dedicated channel to the terminal upon receipt of the positive result of the determination from the switching center.
Processing to release the additional dedicated channel according to one embodiment of the present invention includes the following steps:
At step S
4
, the base station, in which the additional dedicated channel has been allocated to the terminal, determines whether a queuing data quantity of data transferred from the terminal is equal to or less than a delay data quantity-restoring value. When the determination results in “YES”, then the base station requests the switching center through the shared channel to free the additional dedicated channel from the terminal.
At step S
5
, the switching center determines upon receipt of such a request from the base station whether the additional dedicated channel already allocated to the terminal can be released therefrom. Then, the switching center conveys the result of the determination to the base station.
At step S
6
, the base station releases the additional dedicated channel from the terminal upon receipt of the positive result of the determination from the switching center.
Pursuant to a preferred embodiment of the present invention, in the dedicated channel allocated to the terminal, when data transferred from the terminal is waited because of an excessive quantity of transferred data, and further when a queuing data quantity of the data is equal to or greater than a predetermined delay data quantity-generating value, then another dedicated channel (or an “additional dedicated channel”) is allocated to the terminal, thereby transferring the data through the additional dedicated channel until the queuing data quantity is equal to or less than a predetermined delay data quantity-restoring value.
Processing to allocate the additional dedicated channel according to one embodiment of the present invention includes the following steps:
At step S
11
, the switching center determines whether a queuing data quantity of data transferred to the terminal is equal to or greater than a delay data quantity-generating value. When the dete
NEC Corporation
Ng Christine
Nguyen Chau
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