Asymmetric multiple access protocol for a communication system
First Claim
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1. A method of time division duplexing in a mobile cellular communication system comprising:
- dividing the communication system into a plurality of cells, each cell being served by a base station;
providing a channel in the communication system over which a base station and at least one mobile station may communicate;
using time division duplexing to divide the channel into a plurality of frames, each frame consisting of a plurality of slots;
coordinating the time division duplexing across a plurality of cells; and
in which each base station allocates slots to either uplink communication or downlink communication to optimise throughput in the channel comprising that each frame includes a compulsory uplink communication slot and a compulsory downlink communication slot, inhibiting a mobile station from using selected slots of frames dependent upon the mobile station being determined as in an area where drown-out would otherwise occur, the selected slots not including the compulsory uplink communication slot and compulsory downlink communication slot.
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Abstract
The invention relates to mobile cellular communication systems in which asymmetric access to a time division duplex (TDD) communication channel is provided. The channel is divided (by TDD) into slots which are allocated to either uplink communication or downlink communication by the base station in each cell. Timing of slots, and thus of compulsory uplink and downlink slots, is coordinated across the cells of a system.
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Citations
8 Claims
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1. A method of time division duplexing in a mobile cellular communication system comprising:
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dividing the communication system into a plurality of cells, each cell being served by a base station;
providing a channel in the communication system over which a base station and at least one mobile station may communicate;
using time division duplexing to divide the channel into a plurality of frames, each frame consisting of a plurality of slots;
coordinating the time division duplexing across a plurality of cells; and
in whicheach base station allocates slots to either uplink communication or downlink communication to optimise throughput in the channel comprising that each frame includes a compulsory uplink communication slot and a compulsory downlink communication slot, inhibiting a mobile station from using selected slots of frames dependent upon the mobile station being determined as in an area where drown-out would otherwise occur, the selected slots not including the compulsory uplink communication slot and compulsory downlink communication slot. - View Dependent Claims (2, 3, 4)
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5. Apparatus for time division duplexing in a mobile cellular communication system comprising:
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at least one mobile station;
a plurality of base stations, each of which serves a cell of the communications system;
a channel in the communication system over which a base station and at least one mobile station may communicate, the channel being divided, using time division duplexing, into a plurality of frames, each frame consisting of a plurality of slots;
a central controller for coordinating the time division duplexing across a plurality of cells; and
in whicheach base station allocates slots to either uplink communication or downlink communication to optimise throughput in the channel further comprising each frame includes a compulsory uplink slot and a compulsory downlink slot, a mobile station being inhibited from using selected slots of frames dependent upon the mobile station being determined as in an area where drown-out would otherwise occur, the selected slots not including the compulsory uplink communication slot and compulsory downlink communication slot. - View Dependent Claims (6, 7, 8)
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Specification