Patent EP0399612A2 successfully refreshed from Google Patents.
EP0399612A2
Expired / Lapsed
EP
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Data transmission over a time division duplex channel
Assignee: Philips Electronics UK Ltd
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Filing: 1990-05-22
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Granted: —
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Expires: 2010-05-22
Abstract
Abstract A method of, and system for, data transmission over a time division duplex channel in which at least one duplex voice channel constituted by a pair of non-adjacent time slots (or physical channels) in a succession of time frames is allocated for effecting a data transaction between a first and a second station, one of said pair of time slots (or physical channels) being normally designated for unidirectional transmission of data in a first direction between the first and second stations and the other of the pair of time slots (or physical channels) being normally designated for unidirectional transmission of data in a second direction, opposite to the first direction. The system comprises means for determining that either of the time slots (or physical channels) of a duplex voice channel will not participate in, or is not participating in, the transmission of useful data because the data transfer is largely asymmetric and for releasing the non-participating time slots (or physical channels) and making them available for other unidirectional signalling, such as the parallel transmission of data packets in the current data transaction, retransmission of corrupted data packets, or the parallel transmission of data packets in another, largely asymmetric data transaction.
Inventors
- 👤 Robert C/O Philips Radio Comm. Systems Shepherd
- 👤 Frank Charles Gwyn Owen
- 👤 Christopher David Pudney
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 15:22
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04B7/212; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/733; H04B7/24; H04B7/26; H04B7/2643; H04W; H04W72/00; H04W72/04; H04L; H04L1/00; H04L1/12; H04L1/16; H04L1/1607; H04W72/044; H04W72/0446; H04W74/00; H04W74/04; H04W76/00; H04W76/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
139 words
A method of data transmission over a time division duplex channel in which at least one duplex voice channel constituted by a pair of non-adjacent time slots (or physical channels) in a succession of time frames is allocated for effecting a data transaction between a first and a second station, one of said pair of time slots being normally designated for unidirectional transmission of data in a first direction between said first and second stations and the other of said pair of time slots being normally designated for unidirectional transmission of data in a second direction, opposite to the first direction, wherein in response to it being determined that the data transaction will be or is asymmetric, then the time slot not being used for the transmission of useful data is released and made available for other unidirectional signalling.
Claim 2
Independent Claim
139 words
A method of data transmission over a time division duplex channel in which at least one duplex voice channel constituted by a pair of non-adjacent time slots (or physical channels) in a succession of time frames is allocated for effecting a data transaction between a first and a second station, one of said pair of time slots being normally designated for unidirectional transmission of data in a first direction between said first and second stations and the other of said pair of time slots being normally designated for unidirectional transmission of data in a second direction, opposite to the first direction, wherein in response to it being determined that the data transaction will be or is asymmetric, then the time slot not being used for the transmission of useful data is released and made available for other unidirectional signalling.
Claim 3
Dependent Claim
35 words
A method as claimed in Claim 1, characterised in that it is known in advance that the data transaction will be asymmetric and the time slots are released as part of the call establishment procedure.
Claim 4
Dependent Claim
24 words
A method as claimed in Claim 1, characterised in that the data transaction is determined to be asymmetric by monitoring the duplex voice channel(s).
Claim 5
Dependent Claim
19 words
A method as claimed in Claim 3, characterised in that the duplex voice channels are monitored for padding signals.
Claim 6
Dependent Claim
23 words
A method as claimed in Claim 3, characterised in that the duplex voice channels are monitored for the absence of useful data signals.
Claim 7
Independent Claim
29 words
A method as claimed in any one of Claims 1 to 5, characterised in that the released time slot is made available for unidirectional signalling in the opposite direction.
Claim 8
Dependent Claim
37 words
A method as claimed in Claim 6, characterised in that the released time slot is used to transmit data packets forming part of the data message being transacted in the other of the pair of time slots.
Claim 9
Independent Claim
42 words
A method as claimed in any one of Claims 1 to 5, characterised in that the released time slot is made available for the unidirectional transmission of data packets forming part of another data message being transacted in another duplex voice channel.
Claim 10
Independent Claim
27 words
A method as claimed in any one of Claims 1 to 5, characterised in that at least two duplex voice channels are allocated to a data transaction.
Claim 11
Dependent Claim
69 words
A method as claimed in Claim 9, characterised in that the non-data transmitting time slots of one of the duplex voice channels is used for the transmission of acknowledgements relating to the data transaction, the balance of the non-data transmitting time slots of the or each of the assigned duplex voice channels being released for unidirectional signalling in the opposite direction of data comprising part of the data transaction.
Claim 12
Dependent Claim
66 words
A method as claimed in Claim 9, characterised in that in the event of a second data transaction being set-up involving the same secondary station, at least one further duplex voice channel is assigned to the second data transaction, those time slots not being used for the transmission of useful data relating to the second data transaction being released and made available for other unidirectional signalling.
Claim 13
Dependent Claim
134 words
A communications system comprising at least one primary station, a system controller connected to the at least one primary station, a data secondary station, the primary and secondary stations each having transceivers for time division duplex radio transmissions therebetween in at least one duplex voice channel constituted by a predetermined pair of non-adjacent time slots (or physical channels) in a succession of time frames, the respective time slots being provided for unidirectional transmission in opposite directions, the system controller and the data secondary station each having means for assigning at least one duplex voice channel for a data transaction, means for determining if the data transaction will be or is asymmetric and for releasing the time slot not being used for the transmission of useful data and making it available for other unidirectional signalling.
Claim 14
Dependent Claim
134 words
A communications system comprising at least one primary station, a system controller connected to the at least one primary station, a data secondary station, the primary and secondary stations each having transceivers for time division duplex radio transmissions therebetween in at least one duplex voice channel constituted by a predetermined pair of non-adjacent time slots (or physical channels) in a succession of time frames, the respective time slots being provided for unidirectional transmission in opposite directions, the system controller and the data secondary station each having means for assigning at least one duplex voice channel for a data transaction, means for determining if the data transaction will be or is asymmetric and for releasing the time slot not being used for the transmission of useful data and making it available for other unidirectional signalling.
Claim 15
Dependent Claim
23 words
A system as claimed in Claim 12, characterised by means for monitoring the duplex voice channels for the absence of useful data signals.
Claim 16
Dependent Claim
21 words
A system as claimed in Claim 12, characterised by means for monitoring the duplex voice channels for the presence of padding.
References Cited (Backward Citations)
No citation records indexed.
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