Uplink control information (UCI) mapping indicator for long term evolution (LTE) carrier aggregation
A system and method to instruct a User Equipment (UE) how Uplink Control Information (UCI) on a Physical Uplink Shared Channel (PUSCH) should be transmitted with carrier aggregation. A semi-static signaling of a UCI mapping bit (via a Radio Resource Control (RRC) parameter) is used by a base station such as an eNodeB to require the UE to transmit UCI using one of two pre-determined UCI transmission modes. The bit can be decided by the base station, considering, for example, the available bandwidth or quality of different Uplink Component Carriers (UL CCs) associated with the UE. This network-based solution allows the network to either configure a general rule of UCI transmission by the UE or to enforce the UCI transmission on the Uplink Primary cell (UL Pcell). Because of the rules governing abstracts, this abstract should not be used to construe the claims.
1. A method performed at a mobile handset, comprising:
receiving information indicating a value of an Uplink Control Information (UCI) mapping bit via radio signaling from a mobile communication node; and
in response to a determination that a physical uplink shared channel (PUSCH) is to be transmitted during a current subframe on an Uplink Secondary cell (UL Scell) and not on an Uplink Primary cell (UL Pcell), transmitting UCI to the mobile communication node using a first mode of UCI transmission or a second mode of UCI transmission in accordance with the value of the UCI mapping bit;
wherein transmitting the UCI using the first mode of UCI transmission comprises transmitting the UCI on the PUSCH,
wherein transmitting the UCI using the second mode of UCI transmission comprises transmitting the UCI on a physical uplink control channel (PUCCH); and
wherein the UCI mapping bit corresponds to a value of a radio resource control (RRC) signaling parameter that indicates whether simultaneous PUCCH and PUSCH transmissions is configured for the mobile handset.
2. The method of claim 1 , wherein transmitting the UCI using the first mode of transmission comprises transmitting the UCI with periodic CSI contained therein in the current subframe using the PUSCH on a UL CC associated with the mobile handset and having a widest bandwidth among all UL CCs associated with the mobile handset.
3. The method of claim 1 , wherein the UCI includes at least one of the following:
Acknowledge/Negative Acknowledge (ACK/NACK) feedback information;
a Channel Quality Indicator (CQI);
a Precoding Matrix Indicator (PMI); and
a Rank Indicator (RI).
4. The method of claim 1 , wherein the UCI comprises Acknowledge/Negative Acknowledge (ACK/NACK) feedback information.