EP0507384B1
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EP
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TDMA transmission system with time slots of different durations
Assignee: Philips Electronics UK Ltd
•
Filing: 1992-03-26
•
Granted: 1998-07-08
•
Expires: 2012-03-26
Abstract
No abstract record available.
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
2026-10-24 10:34
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2643
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A method of transmitting signals on a system having at
least two different carrier spacings, characterised by channel coding signals to
be transmitted at a first of said at least two different carrier spacings, said
signals being formatted into first traffic signal time slots of a first predetermined
duration, by channel coding signals to be transmitted at a second of said at
least two different carrier spacings which second carrier spacing is different
from the first carrier spacing, said second signals being formatted into second
traffic signal time slots of a second predetermined duration which is different
from the first predetermined duration, by encoding said signals such that the
number of symbols transmitted in the first and second time slots is substantially
constant and by transmitting the symbols in accordance with a respective
predetermined modulation scheme.
Claim 2
Dependent Claim
31 words
A method as claimed in Claim 1, characterised by arranging the
traffic signal time slots in concatenated frames, each respective frame
containing traffic signal time slots having a same respective duration.
Claim 3
Dependent Claim
42 words
A method as claimed in Claim 1, characterised by arranging the
time slots in concatenated frames, one of said frames containing at least one
of said first traffic signal time slots and at least one of said second traffic signal
time slots.
Claim 4
Dependent Claim
43 words
A method as claimed in Claim 1, characterised by arranging the
time slots in concatenated frames, at least one of said frames containing said
first traffic signal time slots and at least another of said frames containing said
second traffic signal time slots.
Claim 5
Independent Claim
59 words
A method as claimed in any one of Claims 1 to 4, characterised
in that each traffic signal time slot includes a synchronisation sequence which
comprises symbols which are common to the or each respective modulation
scheme, said synchronisation sequence including a sequence key indicative of
the number of modulation levels used in the transmission of the traffic signal.
Claim 6
Independent Claim
37 words
A method as claimed in any one of Claims 1 to 5, characterised
by using one predetermined modulation scheme for transmitting certain traffic
signals and using a different predetermined modulation scheme for transmitting
certain other traffic signals.
Claim 7
Independent Claim
30 words
A method 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
43 words
A method as claimed in any one of Claims 1 to 7, characterised
by transmitting control signals respectively relating to said traffic signal time
slots at a same symbol rate irrespective of the duration of the first and second
traffic signal time slots.
Claim 9
Dependent Claim
64 words
A method as claimed in Claim 3, characterised by the traffic signal
time slots of the second predetermined duration being twice as long as the
traffic signal time slots of the first duration and by maintaining the fidelity of
digitised speech encoded for transmission at the second carrier spacing by
forming a second traffic signal time slot from two first traffic signal time slots.
Claim 10
Dependent Claim
227 words
A transceiver for transmitting and receiving signals operating in
a transmission system having at least two different carrier spacings, said
signals being transmitted in traffic signal time slots having one of at least two
different predetermined durations, traffic signal symbols in each time slot being
transmitted according to a respective predetermined modulation scheme,
characterised in that said transceiver comprises means (74,76) for receiving a
signal to be transmitted in accordance with a predetermined respective
modulation scheme, channel coding means (80) for grouping said signal to be
transmitted into groups of symbols to be transmitted in different traffic signal
time slots, the number of symbols in each traffic signal time slot being
substantially the same irrespective of the duration of the traffic signal time slot,
control means (80) for controlling time slot generation by the channel coding
means such that each traffic signal time slot has one of said at least two
predetermined durations, a transmitter (90,92,94) for transmitting said groups
of symbols in said respective traffic signal time slots, according to said
predetermined respective modulation scheme, and a receiver (44 to 72) for
receiving groups of symbols which were transmitted according to said
predetermined respective modulation scheme in respective traffic signal time
slots having one of said at least two predetermined durations, said receiver
having means for recovering the coded signals from said traffic signal time
slots.
References Cited (Backward Citations)
No citation records indexed.
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