Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Patent
1997-11-05
2000-10-10
Pham, Chi H.
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
370440, 370468, H04L 1256
Patent
active
061308889
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an ATM (Asynchronous Transfer Mode) transmission system, and more particularly to an ATM transmission method, and a system, transmitter and receiver using the same that can improve the channel efficiency by suppressing transmission of mute sections of voices.
BACKGROUND ART
A conventional ATM transmission system carries out transmission through a fixed band occupied on a channel between stations regardless of the presence or absence of speech as long as the call continues. Therefore, speech spurt cells are mixed with mute cells, thereby impairing the channel efficiency by an amount corresponding to the mute cells.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide an ATM transmission method, and a system, transmitter and receiver using the same, which have mute compression control function that can compress the mute sections by suppressing their transmission by notifying a party of the start and end of each of the mute sections.
In a first aspect of the present invention, there is provided an ATM (Asynchronous Transfer Mode) transmission method for transmitting input voice data using a cell consisting of a fixed length bit sequence, the ATM transmission method comprising the steps of: section, and transmitting the mute start cell; pair of an end of the mute section, and transmitting the mute end cell, and received; and
Here, the mute start cell and the mute end cell may be transmitted through a control channel other than a channel for transmitting the voice data.
The transmitting side may handle the input voice data on a frame-by-frame basis, and may detect the mute section frame by frame.
The receiving side may handle the voice data obtained from the cell on the frame-by-frame basis.
The receiving side may generate, after starting generation of the mute section, a mute frame every time a time period has elapsed corresponding to a length of the frame, and outputs the mute frame as the mute section.
The transmitting side may add to the frame a number indicating an input sequence, and may manage the frame in accordance with the number.
The receiving side may add to the frame a number indicating a generated sequence, and may manage the frame in accordance with the number.
The receiving side may release a channel if the mute end cell does not arrive for a predetermined time period after receiving the mute start cell.
In a second aspect of the present invention, there is provided an ATM (Asynchronous Transfer Mode) transmission system for transmitting input voice data using a cell consisting of a fixed length bit sequence, the ATM transmission system comprising: pair of a start of the mute section; continues; and end cell for notifying the pair of an end of the mute section; and is received; and received.
Here, the ATM transmission system may further comprise a control channel for transmitting the mute start cell and the mute end cell, the control channel being provided besides a channel for transmitting the voice data.
The transmitter may handle the input voice data on a frame-by-frame basis, and may further comprise means for detecting whether the frame is vocal or mute.
The receiver may comprise means for converting the voice data obtained from the received cell into the frame.
The receiver may further comprise a mute timer for counting an elapsed time after starting generation of the mute section, and means for generating a mute frame every time the mute counter counts a time period corresponding to a length of the frame.
The transmitter may further comprise means for adding to the frame a number indicating an input sequence, and may manage the frame in accordance with the number.
The receiver may further comprise means for adding to the frame a number indicating a generated sequence, and may manage the frame in accordance with the number.
The receiver may further comprise means for counting an elapsed time after receiving the mute start cell, and means for releasing a channel if the mute end cell does not arrive for a predete
REFERENCES:
patent: 5058111 (1991-10-01), Kihara et al.
patent: 5414796 (1995-05-01), Jacobs et al.
patent: 5757801 (1998-05-01), Arimilli
patent: 5897613 (1999-04-01), Chan
Nakajima Akihisa
Nakamura Hiroshi
Onuki Masafumi
Tsuboya Hisakazu
NTT Mobile Communications Network Inc.
Pham Chi H.
Yao Kwang B.
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