Method of operating a communications system, a communications system and a secondary station for use in the system
First Claim
1. A method of operating a frequency division multiplex, FDM, -time division duplex, TDD, communications system comprising at least one primary station and one secondary station, Wherein the one primary and the one secondary station are communicating with each other in successive TDD frames in a plurality of FDM channels, each TDD frame including a transmit half frame and a receive half frame, the method comprisingcommunicating between one secondary station and one primary station on one of the plurality FDM channels andmonitoring, in the one secondary station, a channel quality parameter in at least one other FDM channel during the receive half frame of one of every n TDD frames, where n is an integer greater than one.
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Abstract
A method of operating a communications system, particularly a FDM-TDD cordless telephony system, in which, in order to expedite handover, a portable secondary station builds up a record of the status and quality of the other FDM channels in the system by every 1 in n (where n is an integer greater than one) TDD frames monitoring another FDM channel. The value of n is adaptive in that, as the quality of its existing channel deteriorates, the value of n decreases, thereby updating its record more rapidly. At handover, the secondary station is able to choose immediately an acceptable alternative channel, thereby avoiding the time overhead of scanning all the other FDM channels.
145 Citations
35 Claims
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1. A method of operating a frequency division multiplex, FDM, -time division duplex, TDD, communications system comprising at least one primary station and one secondary station, Wherein the one primary and the one secondary station are communicating with each other in successive TDD frames in a plurality of FDM channels, each TDD frame including a transmit half frame and a receive half frame, the method comprising
communicating between one secondary station and one primary station on one of the plurality FDM channels and monitoring, in the one secondary station, a channel quality parameter in at least one other FDM channel during the receive half frame of one of every n TDD frames, where n is an integer greater than one.
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16. A frequency division multiplex, FDM, -time division duplex, TDD, communications system comprising
at least one primary station and at least one secondary station for communicating with the primary station over one of a plurality of FDM channels, the secondary station including a transmitter, a receiver, means for tuning the transmitter and receiver to any one of the FDM channels, control means for causing the tuning means to retune at least the receiver, for a receive half frame of one in every n TDD frames, to at least one other FDM channel, where n is an integer greater than one, and means for monitoring a channel quality parameter in the at least one other FDM channel.
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26. A secondary station for use in a frequency division multiplex, FDM, -time division duplex, TDD, communication system comprising at least one primary station and at least one secondary station for communicating with the primary station over a communicating one of a plurality of FDM channels, the secondary station comprising
a transmitter, a receiver, means for tuning the transmitter and receiver to any one of the FDM channels, control means for causing the tuning means to retune at least the receiver, for a receive half frame of one in every n TDD frames, to at least one other FDM channel, where n is an integer greater than one, and means for monitoring a channel quality parameter in the at least one other FDM channel.
Specification