Frame structure forcellular telecommunications systems
First Claim
1. A cellular telecommunications time division system, wherein a main station for a cell provides a defined frame structure, wherein each frame comprises a plurality of timeslots, each timeslot having at the end a guard period, the main station having means for transmitting data bursts within each time slot, and means for transmitting timing deviation signals to subsidiary stations within the cell, each subsidiary station within the cell of the main station having means for adjusting its timing to received timing deviation signals, for adjusting the timing of uplink transmission bursts, characterised in that:
- the guard period at the main station for a downlink slot followed by an adjacent uplink slot is longer than a guard period for an uplink slot followed by an adjacent downlink slot, whereby the cell size may be extended.
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Accused Products
Abstract
In order to double the size of cells for a UMTS/UTRAN system operating in time division mode (TDD) from 3.75 km to 7.5 km, the node B station defines the guard period for a downlink slot followed by an adjacent uplink slot to be longer than the guard period for an uplink slot followed by an adjacent downlink slot, whereby the cell size is extended. Each UE adjusts its timing in reponse to timing deviation signals transmitted at the start of each downlink bust, so as to transmit an uplink burst which arrive at the Node B, at the beginning of the next uplink slot.
39 Citations
17 Claims
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1. A cellular telecommunications time division system, wherein a main station for a cell provides a defined frame structure, wherein each frame comprises a plurality of timeslots, each timeslot having at the end a guard period, the main station having means for transmitting data bursts within each time slot, and means for transmitting timing deviation signals to subsidiary stations within the cell,
each subsidiary station within the cell of the main station having means for adjusting its timing to received timing deviation signals, for adjusting the timing of uplink transmission bursts, characterised in that: the guard period at the main station for a downlink slot followed by an adjacent uplink slot is longer than a guard period for an uplink slot followed by an adjacent downlink slot, whereby the cell size may be extended. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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2. Apparatus for a cellular telecommunications time division system, including a main station for a cell including means providing a defined frame structure, wherein each frame comprises a plurality of timeslots, each timeslot having at the end a guard period, the main station including means for transmitting data bursts within a time slot, and means for transmitting timing deviation signals to subsidiary stations within the cell,
at least one subsidiary station within the cell of the main station having means for adjusting its timing to received timing deviation signals, for adjusting the timing of uplink transmission bursts, characterized in that said means providing a defined frame structure is arranged to provide a guard period at the main station for a downlink slot followed by an adjacent uplink slot which is longer than a guard period for an uplink slot followed by an adjacent downlink slot, whereby the cell size may be extended.
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10. A method of time division access in a cellular telecommunications system, wherein a main station for a cell provides a defined frame structure, each frame comprises a plurality of timeslots, each timeslot having at the end a guard period, and the main station transmitting timing deviation signals to subsidiary stations within the cell, each subsidiary station within the cell adjusting its timing to received timing deviation signals, and adjusting the timing of uplink transmission bursts, and characterised in that
the main station defines the guard period for a downlink slot followed by an adjacent uplink slot to be longer than the guard period for an uplink slot followed by an adjacent downlink slot, whereby the cell size is extended.
Specification