Control channel design for eLAA
A flexible and efficient physical downlink control channel (PDCCH) signaling scheme that schedules physical uplink shared channel (PUSCH) transmission over multiple subframes with Hybrid Automatic Retransmission (HARQ) support is proposed. The PDCCH has a downlink control information (DCI) format that schedules PUSCH transmission over multiple subframes. The PUSCH transmission is associated with multiple HARQ processes with non-consecutive HARQ process IDs. Furthermore, the DCI format uses joint signaling to combine HARQ process indexes, new data indication (NDI), and redundancy version (RV) to reduce signaling overhead.
1. A method comprising:
transmitting an uplink grant over a physical downlink control channel (PDCCH) to a user equipment (UE) by a base station in an orthogonal frequency division multiplexing (OFDM) wireless communications network;
receiving an uplink transmission in response to the uplink grant, wherein the uplink transmission is applied with multiple Hybrid Automatic retransmission (HARQ) processes, and wherein the multiple HARQ processes have non-consecutive HARQ process IDs; and
transmitting a downlink control information (DCI), wherein the DCI comprises subsequent uplink grant information for HARQ data retransmission as well as HARQ new data transmission over multiple subframes.
2. The method of claim 1 , wherein the DCI comprises resource allocation, modulation and coding scheme (MCS), new data indication (NDI), and transmit power information.
3. The method of claim 2 , wherein the DCI further comprises HARQ process IDs, redundancy versions (RVs), resource interlace allocation information, and uplink subframe index information.
4. The method of claim 3 , wherein the NDI, the HARQ process IDs, and the RVs are jointly signaled with a reduced number of bits.
5. The method of claim 4 , wherein a single index number is created to independently signal a corresponding NDI, a corresponding HARQ process ID, and a corresponding RV.
6. The method of claim 3 , wherein the DCI also indicates that the multiple subframes are contiguous.
7. The method of claim 3 , wherein the DCI also indicates that the multiple subframes are non-contiguous, and the non-contiguous subframes are jointly signaled with the NDI, the HARQ process IDs, and the RVs.
8. A method, comprising:
receiving an uplink grant from a base station over a physical downlink control channel (PDCCH) by a user equipment (UE) in an orthogonal frequency division multiplexing (OFDM) wireless communications network;
transmitting uplink data over a physical uplink shared channel (PUSCH) in response to the uplink grant, wherein the PUSCH transmission is applied with multiple Hybrid Automatic retransmission (HARQ) processes, and wherein the multiple HARQ processes have non-consecutive HARQ process IDs; and
decoding a downlink control information (DCI) from the base station, wherein the DCI comprises subsequent uplink grant information for HARQ data retransmission as well as HARQ new data transmission over multiple subframes.
9. The method of claim 8 , wherein the DCI comprises resource allocation, modulation and coding scheme (MCS), new data indication (NDI), and transmit power information.
10. The method of claim 9 , wherein the DCI further comprises HARQ process IDs, redundancy versions (RVs), resource interlace allocation information, and uplink subframe index information.
11. The method of claim 10 , wherein the NDI, the HARQ process IDs, and the RVs are jointly signaled with a reduced number of bits.
12. The method of claim 11 , wherein a single index number is created to independently signal a corresponding NDI, a corresponding HARQ process ID, and a corresponding RV.
13. The method of claim 10 , wherein the DCI also indicates that the multiple subframes are contiguous.
14. The method of claim 10 , wherein the DCI also indicates that the multiple subframes are non-contiguous, and the non-contiguous subframes are jointly signaled with the NDI, the HARQ process IDs, and the RVs.
15. A user equipment (UE), comprising:
a receiver that receives an uplink grant from a base station over a physical downlink control channel (PDCCH) in an orthogonal frequency division multiplexing (OFDM) wireless communications network;
a transmitter that transmits uplink data over a physical uplink shared channel (PUSCH) in response to the uplink grant, wherein the PUSCH transmission is applied with multiple Hybrid Automatic retransmission (HARQ) processes, and wherein the multiple HARQ processes have non-consecutive HARQ process IDs; and
a decoder that decodes a downlink control information (DCI) from the base station, wherein the DCI comprises subsequent uplink grant information for HARQ data retransmission as well as HARQ new data transmission over multiple subframes.
16. The UE of claim 15 , wherein the DCI comprises resource allocation, modulation and coding scheme (MCS), new data indication (NDI), and transmit power information.
17. The UE of claim 16 , wherein the DCI further comprises HARQ process IDs, redundancy versions (RVs), resource interlace allocation information, and uplink subframe index information.
18. The method of claim 17 , wherein the DCI also indicates that the multiple subframes are contiguous.
19. The method of claim 17 , wherein the DCI also indicates that the multiple subframes are non-contiguous, and the non-contiguous subframes are jointly signaled with the NDI, the HARQ process IDs, and the RVs.
20. The method of claim 17 , wherein the NDI, the HARQ process IDs, and the RVs are jointly signaled with a reduced number of bits.
21. The method of claim 20 , wherein a single index number is created to independently signal a corresponding NDI, a corresponding HARQ process ID, and a corresponding RV.