Packet transfer system

Details Packet transfer system Packet transfer system

1999-06-01

2002-10-22

Maung, Nay (Department: 2681)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S336000, C370S328000, C370S230000, C370S443000, C370S468000, C370S462000, C455S560000

Reexamination Certificate

active

06469994

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a system for transferring packet data.
BACKGROUND OF THE INVENTION
Packet transfer systems, where data are transferred within a wired section of communication network while being sectioned into given data-length packets each of which is provided with a destination code, are of a connectionless type that without establishing a line when calling a packet, packet data are transferred using shared channel and of a connection-oriented type that a leased channel is assigned to each user when calling a packet and then packet data are transferred using the leased channel.
FIG. 1
is an illustration showing a connectionless type packet transfer system.
As shown in
FIG. 1
, a communication system that the conventional connectionless type packet transfer system is applied is composed of multiple terminals
110
a
to
110
c,
a wireless base station
120
that is connected through wireless lines with the terminals
110
a
to
110
c,
and a packet switching office
130
that is connected through wired packet lines with the wireless base station
120
. The packet switching office
130
is connected with a network
140
, such as a packet network as a public network and PSTN as a circuit switched network. Also, in the packet switching office
130
, packet terminal equipment
135
to perform a Layer
2
protocol terminal function is provided, where the other Layer
2
protocol terminal function is performed by the terminals
110
a
to
110
c.
In the communication system using the connectionless type packet transfer system, all the lines between the wireless base station
120
and the packet switching office
130
are used as shared channels that the multiple terminals
110
a
to
110
c
can use commonly. So, through one channel, the transferring of packet data by the terminals
110
a
to
110
c
may be performed.
FIG. 2
is an illustration showing a connection-oriented type packet transfer system.
As shown in
FIG. 2
, a communication system that the conventional connection-oriented type packet transfer system is applied is similar to that in FIG.
1
.
In the communication system using the conventional connection-oriented type packet transfer system, when calling a packet, multiple channels between the wireless base station
120
and the packet switching office
130
are used as leased channels each of which only one of the terminals
110
a
to
110
c
can use, where the transferring of packet data by the terminals
110
a
to
110
c
can be performed using the leased channels assigned to the respective terminals
110
a
to
110
c.
However, in the conventional packet transfer systems, the following problems may occur.
(1) In the connectionless type packet transfer system, since one channel is used commonly by multiple users, the utilization efficiency per one channel is enhanced. However, the retransmission throughput for guaranteeing the packet data of multiple users at that channel must be reduced.
(2) In the connection-oriented type packet transfer system, since one channel is assigned to one user, the retransmission throughput at that channel is enhanced. However, since the leased channel is used exclusively by one user from calling to releasing of packet, the hard physical quantity must increase.
Also, when packet data are transferred intermittently, the leased channel will be established even when there is no data transferred. Therefore, the ineffective reserved hard resource must increase. Here, for the packet communications, the per-unit charging system (charging based on the amount of information transferred) is employed in place of the time charging system (charging based on the time during the line is used) for line switching. Therefore, in the above case, a wasteful cost will occur.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide a packet transfer system that packet data can be transferred efficiently without reducing the retransmission throughput of line and without increasing the hard physical quantity.
According to the invention, a packet transfer system for transferring data from a plurality of terminals while sectioning the data into given data-length packets, comprises:
a communication system that is composed of the plurality of terminals, a base station connected through a wireless line with the plurality of terminals and a switching office connected through one or more wired lines with the base station, the wired lines being composed of shared channels that the plurality of terminals can use commonly;
wherein when the amount of data transferred from one of the plurality of terminals is greater than a predetermined value, one of the shared channels is assigned exclusively to the one of the plurality of terminals and data transferred from the one of the plurality of terminals is transferred using only the one of the shared channels.
According to another aspect of the invention, a packet transfer system for transferring data to a plurality of terminals while sectioning the data into given data-length packets, comprises:
a communication system that is composed of the plurality or terminals, a base station connected through a wireless line with the plurality of terminals and a switching office connected through one or more wired lines with the base station, the wired lines being composed of shared channels that the plurality of terminals can use commonly;
wherein when the amount of data transferred to one of the plurality of terminals is greater than a predetermined value, one of the shared channels is assigned exclusively to the one of the plurality of terminals and data transferred to the one of the plurality of terminals is transferred using only the one of the shared channels.
According to another aspect of the invention, a packet transfer system for transferring data from a plurality of terminals while sectioning the data into given data-length packets, comprises:
a communication system that is composed of the plurality of terminals, a base station connected through a wireless line with the plurality of terminals and a stitching office connected through one or more wired lines with the base station, the wired lines being composed of shared channels that the plurality of terminals can use commonly and a leased channel that only one of the plurality of terminals can use;
wherein only when the amount of data transferred from one of the plurality of terminals is greater than a predetermined value, the leased channel is assigned to the one of the plurality of terminals and data transferred from the one of the plurality of terminals is transferred using the leased channel.
According to another aspect of the invention, a packet transfer system for transferring data to a plurality of terminals while sectioning the data into given data-length packets, comprises:
a communication system that is composed of the plurality of terminals, a base station connected through a wireless line with the plurality of terminals and a switching office connected through one or more wired lines with the base station, the wired lines being composed of shared channels that the plurality of terminals can use commonly and a leased channel that only one of the plurality of terminals can use;
wherein only when the amount of data transferred to one of the plurality of terminals is greater than a predetermined value, the leased channel is assigned to the one of the plurality of terminals and data transferred to the one of the plurality of terminals is transferred using the leased channel.
According to another aspect of the invention, a packer transfer system for transferring data from a plurality of terminals while sectioning the data into given data-length packets, comprises:
a communication system that is composed of the plurality of terminals, a base station connected through a wireless line with the plurality of terminals and a switching office connected through one or more wired lines with the base station, the wired lines being composed of shared channels that the plurality of terminals can use commonly;
wherein the bas

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