Control channel signalling for triggering the independent transmission of a channel quality indicator
The invention suggests a method for providing control signalling in a communication system, comprising the steps performed by a base station of the communication system of generating a control channel signal comprising a transport format and a channel quality indicator trigger signal for triggering a transmission of a channel quality indicator by at least one terminal to the base station, and transmitting the generated control channel signal to at least one terminal, wherein said transport format is a predetermined format for user data transmission by the at least one terminal to the base station and said control channel signal indicates a predetermined mode for reporting the channel quality indicator to the base station, wherein the channel quality indicator transmission is to be triggered by the at least one terminal based on the channel quality indicator trigger signal.
1. A method comprising the following steps performed by a mobile terminal:
receiving a control channel signal from a base station, wherein the control channel signal comprises a Modulation and Coding Scheme (MCS) Index, information on resource blocks used for a transmission from the mobile terminal to the base station, and a channel quality information trigger for triggering a transmission of an aperiodic channel quality information report to the base station,
in case when the channel quality information trigger is set and the control channel signal indicates a determined value of the MCS Index and also indicates a number of resource blocks that is smaller than or equal to a determined number of resource blocks, transmitting the aperiodic channel quality information report to the base station without multiplexing the aperiodic channel quality information report, with protocol data unit(s) to be transmitted by the mobile terminal via an Uplink Shared Channel (UL-SCH), and
in case (a) when the channel quality information trigger is set and the control channel signal does not indicate the determined value of the MCS Index, or in case (b) when the channel quality information trigger is set and the control channel signal does not indicate a number of resource blocks that is smaller than or equal to the determined number of resource blocks, transmitting the aperiodic channel quality information report to the base station while multiplexing the aperiodic channel quality information report with protocol data unit(s) to be transmitted by the mobile terminal via the UL-SCH.
2. The method according to claim 1 , wherein the determined MCS Index has value 29.
3. The method according to claim 1 , wherein the mobile terminal is configured to feed back the aperiodic channel quality information report on a Physical Uplink Shared Channel (PUSCH) based on one of a plurality of reporting modes.
4. The method according to claim 1 , wherein a Physical Uplink Shared CHannel (PUSCH) is used to transmit the aperiodic channel quality information report.
5. The method according to claim 1 , wherein the channel quality information trigger is a Channel Quality information request bit.
6. The method according to claim 1 , wherein the determined MCS Index indicates a redundancy version with value 1.
7. The method according to claim 1 , wherein the channel quality information is at least one of a channel quality indicator, a precoding matrix indicator, and a rank indicator.
8. A mobile terminal comprising:
a receiver configured to receive a control channel signal from a base station, wherein the control channel signal comprises a Modulation and Coding Scheme (MCS) Index, information on resource blocks used for a transmission from the mobile terminal to the base station, and a channel quality information trigger for triggering a transmission of an aperiodic channel quality information report to the base station, and
a transmitter configured to transmit the aperiodic channel quality information report to the base station, the transmitter being further configured:
to transmit the aperiodic channel quality information report without multiplexing the aperiodic channel quality information report, with protocol data unit(s) to be transmitted by the mobile terminal via an Uplink Shared Channel (UL-SCH), in case when the channel quality information trigger is set and the control channel signal indicates a determined value of the MCS Index and also indicates a number of resource blocks that is smaller than or equal to a determined number of resource blocks, and
to transmit the aperiodic channel quality information report while multiplexing the aperiodic channel quality information report, with protocol data unit(s) to be transmitted by the mobile terminal via the UL-SCH, in case (a) when the channel quality information trigger is set and the control channel signal does not indicate the determined value of the MCS Index, or in case (b) when the channel quality information trigger is set and the control channel signal does not indicate a number of resource blocks that is smaller than or equal to the determined number of resource blocks.
9. The mobile terminal according to claim 8 , wherein the determined MCS Index has value 29.
10. The mobile terminal according to claim 8 , which is configured to feed back the aperiodic channel quality information report on a Physical Uplink Shared Channel (PUSCH) based on one of a plurality of reporting modes.
11. The mobile terminal according to claim 8 , wherein the transmitter is configured to use a Physical Uplink Shared CHannel (PUSCH) to transmit the aperiodic channel quality information report.
12. The mobile terminal according to claim 8 , wherein the determined MCS Index indicates a redundancy version with value 1.
13. The mobile terminal according to claim 8 , wherein the channel quality information is at least one of a channel quality indicator, a precoding matrix indicator, and a rank indicator.