EP0507384A2
Expired / Lapsed
EP
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TDMA transmission system with time slots of different durations
Assignee: Philips Electronics UK Ltd
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Filing: 1992-03-26
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Granted: —
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Expires: 2012-03-26
Abstract
Abstract A signal transmission system, for example a TDMA system, in which a carrier is divided into a plurality of traffic signal time slots, with optionally, some regularly interspersed control signal time slots. In order to be able to provide flexibility in the symbol rates and/or modulation schemes used by complementary users, the traffic signal time slots have one of at least two predetermined durations. However irrespective of the duration(s) of the traffic signal time slots, the number of symbols per traffic signal time slot remains substantially the same. <IMAGE>
Inventors
- 👤 Andrew James c/o Philips Telecom Richardson
- 👤 Peter John c/o Philips Telecom Mabey
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 22:13
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2643
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
68 words
A transmission system in which a carrier is divided into a plurality of time slots, at least some of which time slots are traffic signal time slots, in which the traffic signal time slots have one of at least two predetermined durations, and in which, irrespective of the duration(s) of the traffic signal time slots, the number of symbols per traffic signal time slot remains substantially the same.
Claim 2
Dependent Claim
34 words
A system as claimed in claim 1, characterised in that the time slots are arranged in concatenated frames and in that the durations of the traffic signal time slots in a frame is equal.
Claim 3
Dependent Claim
35 words
A system as claimed in claim 1, characterised in that the time slots are arranged in concatenated frames and in that the traffic signal time slots in at least one frame have different predetermined durations.
Claim 4
Dependent Claim
48 words
A system as claimed in claim 1, characterised in that the time slots are arranged in concatenated frames and in that on a carrier at least some frames comprise traffic signal time slots of equal duration and other frames comprise traffic signal time slots having different predetermined durations.
Claim 5
Independent Claim
22 words
A system as claimed in any one of claims 2 to 4, characterised in that the frames have a substantially equal duration.
Claim 6
Independent Claim
25 words
A system as claimed in any one of claims 1 to 5, characterised in that different predetermined modulation schemes are used to transmit traffic signals.
Claim 7
Independent Claim
30 words
A system as claimed in any one of claims 1 to 5, characterised in that different predetermined symbol rates and/or different predetermined modulation schemes are used for transmitting traffic signals.
Claim 8
Independent Claim
34 words
A system as claimed in any one of claims 1 to 7, characterised in that control signals are transmitted at the same symbol rate irrespective of the duration of the traffic signal time slot.
Claim 9
Independent Claim
95 words
A system as claimed in any one of claims 1 to 8, characterised in that a synchronisation sequence which comprises symbols which are common to each predetermined modulation scheme is included in each traffic signal time slot, in that the synchronisation sequence includes a sequence key indicative of the number of modulation levels used in the transmission of the traffic signal, and in that a receiving station has means responsive to the receipt of the sequence key for selecting the demodulation scheme to be used in demodulating the traffic signal contained in the time slot.
Claim 10
Dependent Claim
47 words
A transceiver for use in the transmission system as claimed in claim 1, comprising a transmitter, a receiver, channel coding means, and control means for controlling time slot generation by the channel coding means such that each time slot has one of at least two predetermined durations.
References Cited (Backward Citations)
No citation records indexed.
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