Method of controlling a communication system and the system employing the method
AssigneeKoninklijke Philips Electronics N.V.
InventorTimothy J. Moulsley
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Abstract
A method is described of controlling a communication system using a continuous FDD channel. Each time segment of the channel is divided into a predetermined number of sub-segments. For a first set of time segments, the communication signal data for the respective time segment is repeated in all sub-segments, and for a second set of time segments, null periods are provided in one or more of the sub-segments during which the communication signal from the first station to the second station is interrupted. The communication signal data is transmitted during the remaining sub-segments of the second set. This approach enables a slotted transmission mode to be established in a CDMA FDD system, without the need to adapt the spreading ratio of the CDMA system.
Claims9
A method of controlling a communication system in which a communication signal is established between a first station and a second station using a channel comprising sequential time segments in a substantially continuous transmission, the method comprising:
- dividing each of the time segments into a predetermined number of sub-segments of equal size;
- for each time segment of a first set of the time segments, repeating data from the communication signal corresponding to the respective time segment in all sub-segments of the respective time segment;
- and
- for each time segment of a second set of the time segments,
- providing a null period in one or more of the sub-segments of the respective time segment, the communication signal being interrupted during each null period,
- surveying alternative channels for the communication signal during one or more of the null periods;
- and
- transmitting data from the communication signal corresponding to the respective time segment during remaining sub-segments of the respective time segment.
A telecommunication station for transmitting a signal over an allocated channel which is divided into time segments, comprising:
- transmitting means,
- surveying means for surveying alternative channels for the signal;
- timing means for dividing the time segments into sub-segments of equal size,
- repeating means for allocating data from the signal to selected ones of the sub-segments, and
- interrupting means for arranging one or more of the sub-segments as null periods during which transmission of the signal is interrupted,
- wherein, for a first set of the time segments, the repeating means allocates the data from the signal to all sub-segments in the first set for transmission at a first power, and
- wherein, for a second set of time segments,
- the interrupting means arranges one or more of the sub-segments of each time segment in the second set as a null period,
- the surveying means surveys the alternative channels during one or more of the null periods;
- and
- the repeating means allocates the communication signal data to remaining sub-segments of each time segment in the second set for transmission at a second power which is greater than the first power.
A telecommunication station for receiving a signal from a transmitting station over an allocated channel which is divided into time segments with the time segments divided into a predetermined number of sub-segments of equal size, comprising:
- receiving means,
- means for interrupting operation of the receiving means during sub-segments sent from the transmitting station as null periods,
- means for combining data repeated in multiple sub-segments of individual time segments, and
- means for operating the receiving means to survey other communication channels for the signal during the null periods.
Dependencies are inferred from the claim text.