Ntt Mobile Communications Network, Inc.

Masafumi Onuki

Kazuhiro Watanabe

Akihisa Nakajima

Masatomo Nakano

Hiroshi Nakamura

Motoshi Tamura

Akira Kaiyama

Hisakazu Tsuboya

Takatoshi Okagawa

A short cell multiplexing is provided for chiefly transmitting data shorter than the payload of a standard ATM cell (basically the data of less than 48 bytes, but the data more than 48 bytes can be allowed). A standard ATM cell assembler converts various forms of input information into short cells, places the short cells in standard ATM cells efficiently considering their information length, and output them to a B/ISDN network . The standard ATM cell disassembler disassembles the standard ATM cells, which are assembled by the standard ATM cell assembler and is input through the B-ISDN network , into short cells, converts the short cells into those with the original input information forms, and outputs them to channels. The configuration makes it possible for the short cell ATM cell multiplexing to improve channel efficiency with small delay, and matching to the standard ATM system.

Short cell multiplexed ATM transmission system and transmission method

An improvement of an ATM transmission system between a mobileservices switching center and a base station in a mobile communication system. A delay time for generating/sending out a cell is minimized to ensure the information quality required for real time transmission. When the transmission interval of a call type a is T, call types b and c whose periods are twice and four time that of the call type a should be transmitted at intervals twice and four times that of the call type a. A transmitted frame assembler/disassembler in the base station prepares transmitted frames each including the cell slots - - and - for transferring the respective call types, and schedules such that the transmitted frames are sent out to a channel at the interval T, thereby enabling the transmission to be carried out without delay.

Transmission system between base station and switching center of mobile communications using fixed length cell

ATM transmission method having silence compression controlling function

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Tokyo, Japan

Masafumi Onuki