EP0444592A2
Expired / Lapsed
EP
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Multidirection multiplex communication system
Assignee: NEC Corp
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Filing: 1991-02-26
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Granted: —
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Expires: 2011-02-26
Abstract
Abstract A TDM/TDMA (Time Division Multiplex/Time Division Multiple Access) multidirection multiplex communication system of the type using a demand assignment protocol. The system has a multiframe arrangement in which each unit frame is constituted by a frame synchronization signal, a connection control signal for setting up radio channels, N conversation channels, and a single additional bit transmission channel shared by the N conversation channels. When N unit frames are combined in a multiframe format by a frame synchronization signal, N additional bit transmission channels are provided in total.
Inventors
- 👤 Saburo Shinmiyo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 23:11
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/08; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2643; H04W56/00; H04W56/001
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
116 words
A TDM/TDMA multidirection multiplex communication system of a demand assign type in which M (integer) subscriber signals are multiplexed on N (integer smaller than M) radio channels forming a radio fame arrangement in response to every call; said radio frame arrangement comprising an N multiframe format; each frame of said N multiframe format comprising: a frame synchronization signal capable of being arranged in an N multiframe format; a control channel for connection including assignment of conversation channels for call origination and termination; N conversation channels each comprising a time slot sufficient in capacity to transmit a main signal; and a channel comprising a subscriber identification number, information of call origination and termination, an error check bits.
Claim 2
Dependent Claim
122 words
A TDM/TDMA multidirection multiplex communication system of a demand assign type in which M (integer) subscriber signals are multiplexed on N (integer smaller than M) radio channels forming a radio frame arrangement in response to every call; said radio frame arrangement comprising an N/I (I being an integer dividing N) multiframe format; each frame of said N/I multiframe format comprising: a frame synchronization signal capable of being arranged in an N/I multiframe format; a control channel for connection including assignment of conversation channels for call origination and termination; N/I conversation channels each comprising a time slot sufficient in capacity to transmit a main signal; and a channel comprising a subscriber identification number, information of call origination and termination, and error check bits.
Claim 3
Dependent Claim
183 words
A TDM/TDMA multidirection multiplex communication system of a demand assign type in which M (integer) subscriber signals are multiplexed on N (integer smaller than M) radio channels forming a radio frame arrangement in response to every call; means for generating said radio frame arrangement comprising: first converting means for converting M (integer) voice signals sent from subscriber stations into M digital data signals; control means for generating, on determining presence/absence of each of said M voice signals, a control signal for assignment, a subscriber identification number, information of call origination and termination, and error check bits; selecting means responsive to said control signal for assigning said M digital data signals to N (smaller than M) conversation channels and outputting N digital data signals; signal generating means for generating a multiframe timing signal and time slot timing signals; second converting means for converting said information into a burst signal in response to said multiframe timing signal; a third converting means for converting said N digital data signals into N burst signals; and multiplexing means for multiplexing said burst signal and said N burst signals.
References Cited (Backward Citations)
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