Data transmission over a time division duplex channel
First Claim
1. A method of data transmission between a first station and a second station over a time division duplex radio channel comprising the steps of:
- allocating at least one duplex voice channel constituted by a pair of non-adjacent time slots, in a succession of time frames for effecting a data transaction;
default designation one of said pair of non-adjacent time slots for undirectional transmission of data in a first direction between said first and second stations and the other of said pair of time slots for unidirectional transmission of data in a second direction, opposite to the first direction;
determining if the data transaction will be asymmetric;
releasing the time slot not being used for the transmission of useful data for other unidirectional signalling in response to the determining step.
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Accused Products
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.
79 Citations
14 Claims
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1. A method of data transmission between a first station and a second station over a time division duplex radio channel comprising the steps of:
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allocating at least one duplex voice channel constituted by a pair of non-adjacent time slots, in a succession of time frames for effecting a data transaction; default designation one of said pair of non-adjacent time slots for undirectional transmission of data in a first direction between said first and second stations and the other of said pair of time slots for unidirectional transmission of data in a second direction, opposite to the first direction; determining if the data transaction will be asymmetric; releasing the time slot not being used for the transmission of useful data for other unidirectional signalling in response to the determining step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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- 12. A communications system comprising at least one primary station, a system controller connected to 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, 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 including 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.
Specification