Cellular time division telecommunications systems
First Claim
1. A method of operating a telecommunications system comprising the steps of providing in a radio link, a sequence of time frames, each time frame including a plurality of time slots, each time slot having an allocated channel, characterised in that the positions of said time slots and/or said allocated channels are changed in subsequent time frames of said sequence in a predetermined manner.
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Accused Products
Abstract
To reduce interference between physically close base and mobile stations belonging to uncoordinated systems of different operators, in a cellular time division telecommunications system, e.g. the TDD mode of UMTS, a method of operation comprises providing a sequence of time frames, each time frame including a plurality of time slots, each time slot having an allocated uplink or downlink channel, wherein the positions of said time slots of said channels are changed in consecutive time frames of said sequence according to a deterministic sequence, e.g. a cyclic rotation. In an initial set up operation, the base station may instruct a mobile station to transmit or receive in certain time slots, and that these time slots should be changed in succeeding frames according to a predefined algorithm transmitted to the mobile station.
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Citations
20 Claims
- 1. A method of operating a telecommunications system comprising the steps of providing in a radio link, a sequence of time frames, each time frame including a plurality of time slots, each time slot having an allocated channel, characterised in that the positions of said time slots and/or said allocated channels are changed in subsequent time frames of said sequence in a predetermined manner.
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11. An apparatus for providing time division operation of a telecommunications system in a radio link between a base station and mobile stations, the apparatus comprising:
means for providing a series of time frames, each time frame including a plurality of time slots, means for allocating a predetermined channel to each said time slot, characterised by means for changing the positions of said time slots and/or the allocated channels in subsequent frames of the series in a predetermined manner. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification