EP0269202A2
Expired / Lapsed
EP
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A communication system
Assignee: BAE Systems Electronics Ltd
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Filing: 1987-08-24
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Granted: —
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Expires: 2007-08-24
Abstract
Abstract A dynamic frame length slotted ALOHA communication system has a central station which monitors the traffic congestion and determines the optimum frame length. This is transmitted to the sub-stations in the form of a service information message when there is to be a change in the frame length but not, as is conventional, at the beginning of each frame. The amount of time available for the useful transmission of communication messages is thus optimised.
Inventors
- 👤 Barry Gordon West
- 👤 Roger Keith Tolfree
- 👤 Boleslaw Marian Sosin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:38
CPC Classifications
H; H04; H04W; H04W74/00; H04W74/04; H04L; H04L47/00; H04L47/10; H04L47/11; H04L47/12; H04L47/36; H04W28/00; H04W28/02; H04W28/0205; H04W8/00; H04W8/02; H04W8/04; H04W24/00; H04W28/06; H04W48/00; H04W48/08; H04W72/00; H04W72/02; H04W74/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
A communication system comprising a number of sub-stations each designed to transmit a communication message in a time slot selected from a frame containing a number, which is variable, of time slots, and a central station comprising means for setting a value from which each sub-station can derive a currently desired number of slots in a frame, a transmitter for producing an instruction message containing the said value and transmission-initiating means for initiating transmission of the instruction message to the sub-stations in response to a change in the set value, each sub-station being designed to use the said value to determine the number of slots in a frame.
Claim 2
Dependent Claim
108 words
A communication system comprising a number of sub-stations each designed to transmit a communication message in a time slot selected from a frame containing a number, which is variable, of time slots, and a central station comprising means for setting a value from which each sub-station can derive a currently desired number of slots in a frame, a transmitter for producing an instruction message containing the said value and transmission-initiating means for initiating transmission of the instruction message to the sub-stations in response to a change in the set value, each sub-station being designed to use the said value to determine the number of slots in a frame.
Claim 3
Dependent Claim
40 words
A system according to claim 1 in which the transmission initiating means is designed also to initiate transmission of an instruction message in response to the elapse of a pre-determined time interval since the previous transmission of an instruction message.
Claim 4
Dependent Claim
40 words
A system according to claim 1 or 2 in which the central station includes a congestion assessment facility for assessing the degree of traffic congestion in the system and in which the said value is a function of this assessment.
Claim 5
Independent Claim
19 words
A system according to any preceding claim in which the instruction message includes information additional to the said value.
Claim 6
Independent Claim
27 words
A system according to any preceding claim in which different sub-stations are designed to determine different frame lengths from the same value received from the main station.
Claim 7
Independent Claim
39 words
A system according to any preceding claim in which the said instruction messages act as time slot synchronising signals and in which each sub-station contains a slot timing device adapted to lock into synchronism with the said instruction messages.
Claim 8
Dependent Claim
24 words
A communication system substantially as described with reference to figures 1,2 and 3 of the accompanying drawings and substantially as illustrated in figure 1.
Claim 9
Dependent Claim
24 words
A communication system substantially as described with reference to figures 1,2 and 3 of the accompanying drawings and substantially as illustrated in figure 1.
References Cited (Backward Citations)
No citation records indexed.
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