Method and apparatus to improve aperiodic SRS (sounding reference symbol) in a wireless communication system
A method and apparatus are disclosed for aperiodic SRS improvement. In one embodiment, the method comprises configuring a UE (User Equipment) with aperiodic SRS. The method also comprises transmitting a PUSCH (Physical Uplink Shared Channel) on a last SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbol in a UE-specific aperiodic SRS subframe if a Msg3 in the subframe is transmitted on the PUSCH. Furthermore, the method comprises not transmitting a PUSCH on a last SC-FDMA symbol in a UE-specific aperiodic SRS subframe if a Msg3 in the subframe is not transmitted on the PUSCH.
1. A method to implement SRS (Sounding Reference Symbol), comprising:
configuring a UE (User Equipment) with aperiodic SRS; and
transmitting a PUSCH (Physical Uplink Shared Channel) on a last SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbol in a UE-specific aperiodic SRS subframe if a Msg3 in the subframe is transmitted on the PUSCH, wherein the PUSCH does not overlap with a maximum SRS bandwidth.
2. The method of claim 1 , wherein a SPS (Semi-Persistent Scheduling) C-RNTI performs a scrambling initialization of the PUSCH if the PUSCH does not contain the Msg3.
3. The method of claim 1 , wherein the Msg3 is transmitted in a contention-based random access procedure.
4. The method of claim 3 , wherein the random access procedure is triggered by a PDCCH (Physical Downlink Control Channel) order.
5. The method of claim 3 , wherein the random access procedure is triggered by an arrival of uplink (UL) data.
6. The method of claim 3 , wherein the random access procedure is triggered by a handover.
7. The method of claim 1 , wherein a rate-matching of the PUSCH is based on SC-FDMA symbols in the subframe.
8. The method of claim 7 , wherein the rate-matching of the PUSCH excludes the last SC-FDMA symbol in the subframe.
9. The method of claim 1 , wherein the UE does not rate-match the last SC-TDMA symbol of the PUSCH.
10. The method of claim 1 , wherein the UE does not transmit a SRS in the subframe.
11. The method of claim 1 , wherein the UE does not transmit the PUSCH on the last SC-FDMA symbol in the subframe if the PUSCH does not contain the Msg3.
12. The method of claim 1 , wherein a C-RNTI (Cell Radio Network Temporary Identifier) performs a scrambling initialization of the PUSCH if the PUSCH does not contain the Msg3.
13. A communication device for use in a wireless communication system, the communication device comprising:
a control circuit;
a processor installed in the control circuit;
a memory installed in the control circuit and coupled to the processor;
wherein the processor is configured to execute a program code stored in memory to implement SRS (Sounding Reference Symbol) by:
configuring a UE (User Equipment) with aperiodic SRS; and
transmitting a PUSCH (Physical Uplink Shared Channel) on a last SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbol in a UE-specific aperiodic SRS subframe if a Msg3 in the subframe is transmitted on the PUSCH, wherein the PUSCH does not overlap with a maximum SRS bandwidth.
14. The device of claim 13 , wherein a C-RNTI (Cell Radio Network Temporary Identifier) performs a scrambling initialization of the PUSCH if the PUSCH does not contain the Msg3.
15. The device of claim 13 , wherein a SPS (Semi-Persistent Scheduling) C-RNTI performs a scrambling initialization of the PUSCH if the PUSCH does not contain the Msg3.
16. The device of claim 13 , wherein the UE does not transmit the PUSCH on the last SC-FDMA symbol in the subframe if the PUSCH does not contain the Msg3.
17. The device of claim 13 , wherein a rate-matching of the PUSCH is based on SC-FDMA symbols in the subframe.
18. The device of claim 13 , wherein the UE does not transmit the PUSCH on the last SC-FDMA symbol in the subframe if the PUSCH does not contain the Msg3.