Timing of Uplink Transmissions in a Multi-Carrier Communication System
First Claim
1. A method of operating a user equipment in a multi-carrier communication system, the user equipment comprising a transmitter and a receiver, the method comprising:
- operating the receiver to concurrently receive at least two downlink carriers;
receiving, from one or more remote nodes of the multi-carrier communication system, one or more timing advance commands, each of the one or more timing advance commands being associated with a respective one of one or more groups of uplink carriers, each of the groups of uplink carriers comprising at least one uplink component carrier, and each of the groups of uplink carriers being associated with one or more of the received downlink carriers;
for each of the one or more downlink carriers that are associated with one of the one or more groups of one or more uplink carriers, performing;
selecting one of the one or more downlink carriers for use as a reference downlink carrier;
ascertaining a timing of the reference downlink carrier; and
ascertaining a transmission time period based on said ascertained timing of said downlink reference carrier and an offset specified by the timing advance command associated with the one of the one or more groups of one or more uplink carriers, wherein the transmission time period comprises a transmission start time and a transmission stop time; and
controlling the transmitter to initiate transmission of information on the one or more groups of one or more uplink carriers at an earliest transmission start time of the ascertained transmission time periods and to cease transmission at a latest transmission stop time of the ascertained transmission time periods.
1 Assignment
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Accused Products
Abstract
A terminal with transmitter and receiver operates in a multi-carrier communication system and receives at least two downlink carriers. One or more timing advance commands are received, each associated with a group of one or more uplink carriers, each group being associated with one or more of the received downlink carriers. For each downlink carrier associated with one of the groups of uplink carriers, one is selected as a reference downlink carrier; the reference downlink carrier timing is ascertained; and a transmission time period is ascertained based on the timing of the downlink reference carrier and an offset specified by the timing advance command associated with the group of uplink carriers. The transmission time period comprises a start time and a stop time. Transmission is initiated at an earliest transmission start time of the ascertained transmission time periods and is ceased at a latest ascertained stop time.
53 Citations
24 Claims
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1. A method of operating a user equipment in a multi-carrier communication system, the user equipment comprising a transmitter and a receiver, the method comprising:
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operating the receiver to concurrently receive at least two downlink carriers; receiving, from one or more remote nodes of the multi-carrier communication system, one or more timing advance commands, each of the one or more timing advance commands being associated with a respective one of one or more groups of uplink carriers, each of the groups of uplink carriers comprising at least one uplink component carrier, and each of the groups of uplink carriers being associated with one or more of the received downlink carriers; for each of the one or more downlink carriers that are associated with one of the one or more groups of one or more uplink carriers, performing; selecting one of the one or more downlink carriers for use as a reference downlink carrier; ascertaining a timing of the reference downlink carrier; and ascertaining a transmission time period based on said ascertained timing of said downlink reference carrier and an offset specified by the timing advance command associated with the one of the one or more groups of one or more uplink carriers, wherein the transmission time period comprises a transmission start time and a transmission stop time; and controlling the transmitter to initiate transmission of information on the one or more groups of one or more uplink carriers at an earliest transmission start time of the ascertained transmission time periods and to cease transmission at a latest transmission stop time of the ascertained transmission time periods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for operating a user equipment in a multi-carrier communication system, the user equipment comprising a transmitter and a receiver, the apparatus comprising:
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means for operating the receiver to concurrently receive at least two downlink carriers; means for receiving, from one or more remote nodes of the multi-carrier communication system, one or more timing advance commands, each of the one or more timing advance commands being associated with a respective one of one or more groups of uplink carriers, each of the groups of uplink carriers comprising at least one uplink component carrier, and each of the groups of uplink carriers being associated with one or more of the received downlink carriers; means for performing, for each of the one or more downlink carriers that are associated with one of the one or more groups of one or more uplink carriers, the following; selecting one of the one or more downlink carriers for use as a reference downlink carrier; ascertaining a timing of the reference downlink carrier; and ascertaining a transmission time period based on said ascertained timing of said downlink reference carrier and an offset specified by the timing advance command associated with the one of the one or more groups of one or more uplink carriers, wherein the transmission time period comprises a transmission start time and a transmission stop time; and means for controlling the transmitter to initiate transmission of information on the one or more groups of one or more uplink carriers at an earliest transmission start time of the ascertained transmission time periods and to cease transmission at a latest transmission stop time of the ascertained transmission time periods. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification