User equipment, base station and wireless communication method

1. A user equipment, comprising:

circuitry operative to process Uplink Control Information (UCI) bits to be transmitted according to a comparison of a number M of UCI bits generated based on Downlink (DL) assignment(s) before an Uplink (UL) grant from a base station and a number N of UCI bits generated based on DL assignment(s) after the UL grant with a number P of UCI bits indicated in the UL grant and/or a maximum number Q of bits determined based on a maximum coding rate of UCI bits, an assumed resource size and an assumed modulation order, wherein each of M, N, P and Q is an integer equal to or larger than 0; and

a transmitter operative to transmit the processed UCI bits in a Physical Uplink Shared Channel (PUSCH) at a Transmission Time Interval (TTI) indicated in the UL grant to the base station,

wherein when P<(M+N)≤Q, the circuitry multiplexes the N UCI bits with the M UCI bits together without compression.

2. The user equipment according to claim 1 , wherein when (M+N)≤P, the circuitry multiplexes the N UCI bits with the M UCI bits together without compression,

when M<P<(M+N), the circuitry bundles the N UCI bits into (N−X1) UCI bits, bundles the M UCI bits into (M−X2) UCI bits and multiplexes the (N−X1) UCI bits with the (M−X2) UCI bits together, wherein (X1+X2)=M+N−P in which both X1 and X2 are integers equal to or larger than 0, and

when P≤M, the circuitry bundles the N UCI bits into (N−Y1) UCI bits, bundles the M UCI bits into (M−Y2) UCI bits and multiplexes the (N−Y1) UCI bits with the (M−Y2) UCI bits together, wherein (Y1+Y2)=M+N−P in which both Y1 and Y2 are integers larger than 0.

3. The user equipment according to claim 1 , wherein when (M+N)≤Q, the circuitry multiplexes the N UCI bits with the M UCI bits together without compression, and

when Q<(M+N), the circuitry bundles the N UCI bits into (N−Z1) UCI bits, bundles the M UCI bits into (M−Z2) UCI bits and multiplexes the (N−Z1) UCI bits with the (M−Z2) UCI bits together, wherein (Z1+Z2)≥M+N−Q in which both Z1 and Z2 are integers equal to or larger than 0.

4. The user equipment according to claim 1 , wherein the UCI bits are used for a first UCI, and wherein

when a difference between a transmitted coding rate of the first UCI considering DL assignment(s) after the UL grant and a transmitted coding rate of the first UCI not considering DL assignment(s) after the UL grant is higher than a predetermined value, the circuitry pre-empts resources used for a second UCI of a priority lower than that of the first UCI in the PUSCH to provide additional bits for the first UCI.

5. The user equipment according to claim 4 , wherein the circuitry pre-empts resources used for the second UCI in PUSCH by bundling and/or dropping the second UCI, and

wherein dropping the second UCI comprising one of:

dropping some REs for the second UCI without changing a coding rate of the second UCI;

changing the coding rate of the second UCI to leave some REs to be used for the first UCI; and

dropping all of REs for the second UCI.

6. The user equipment according to claim 4 , wherein the first UCI is Hybrid Automatic Repeat request-Acknowledgement (HARQ-ACK) and the second UCI is Channel State Information (CSI).

7. The user equipment according to claim 2 , wherein the bundling is performed in a spatial domain first and then in a frequency domain and finally in a time domain, or performed in the spatial domain first and then in the time domain and finally in the frequency domain, which is based on RRC configuration or specified in a standard.

8. The user equipment according to claim 1 , wherein the UCI bits are used for one of HARQ-ACK, CSI part 1 and CSI part 2, and

wherein the coding rate for each of HARQ-ACK, CSI part 1 and CSI part 2 is separately configured.

9. A base station, comprising:

a receiver operative to receive Uplink Control Information (UCI) bits transmitted in a Physical Uplink Shared Channel (PUSCH) at a Transmission Time Interval (TTI) indicated in an Uplink (UL) grant from a user equipment; and

circuitry operative to decode the UCI bits in accordance with a UCI multiplexing rule,

wherein the UCI bits before transmission are processed at the user equipment according to a comparison of a number M of UCI bits generated based on Downlink (DL) assignment(s) before the UL grant from the base station and a number N of UCI bits generated based on DL assignment(s) after the UL grant with a number P of UCI bits indicated in the UL grant and/or a maximum number Q of bits determined based on a maximum coding rate of UCI bits, an assumed resource size and an assumed modulation order, wherein each of M, N, P and Q is an integer equal to or larger than 0, and

wherein when P<(M+N)≤Q, the N UCI bits are multiplexed with the M UCI bits without compression at the user equipment.

10. The base station according to claim 9 , wherein

when (M+N)≤P, the N UCI bits are multiplexed with the M UCI bits together without compression at the user equipment,

when M<P<(M+N), the N UCI bits are bundled into (N−X1) UCI bits, the M UCI bits are bundled into (M−X2) UCI bits and the (N−X1) UCI bits are multiplexed with the (M−X2) UCI bits together at the user equipment, wherein (X1+X2)=M+N−P in which both X1 and X2 are integers equal to or larger than 0, and

when P≤M, the N UCI bits are bundled into (N−Y1) UCI bits, the M UCI bits are bundled into (M−Y2) UCI bits and the (N−Y1) UCI bits are multiplexed with the (M−Y2) UCI bits together at the user equipment, wherein (Y1+Y2)=M+N−P in which both Y1 and Y2 are integers larger than 0.

11. The base station according to claim 9 , wherein

when (M+N)≤Q, the N UCI bits are multiplexed with the M UCI bits together without compression at the user equipment, and

when Q<(M+N), the N UCI bits are bundled into (N−Z1) UCI bits, the M UCI bits are bundled into (M−Z2) UCI bits and the (N−Z1) UCI bits are multiplexed with the (M−Z2) UCI bits together at the user equipment, wherein (Z1+Z2)≥M+N−Q in which both Z1 and Z2 are integers equal to or larger than 0.

12. A wireless communication method for a user equipment, comprising:

processing Uplink Control Information (UCI) bits to be transmitted according to a comparison of a number M of UCI bits generated based on Downlink (DL) assignment(s) before an Uplink (UL) grant from a base station and a number N of UCI bits generated based on DL assignment(s) after the UL grant with a number P of UCI bits indicated in the UL grant and/or a maximum number Q of bits determined based on a maximum coding rate of UCI bits, an assumed resource size and an assumed modulation order, wherein each of M, N, P and Q is an integer equal to or larger than 0, wherein when P<(M+N)≤Q, the N UCI bits are multiplexed with the M UCI bits without compression; and

transmitting the processed UCI bits in a Physical Uplink Shared Channel (PUSCH) at a Transmission Time Interval (TTI) indicated in the UL grant to the base station.

13. A wireless communication method for a base station, comprising:

receiving Uplink Control Information (UCI) bits transmitted in a Physical Uplink Shared Channel (PUSCH) at a Transmission Time Interval (TTI) indicated in an Uplink (UL) grant from a user equipment; and

decoding the UCI bits in accordance with a UCI multiplexing rule,

wherein the UCI bits before transmission are processed at the user equipment according to a comparison of a number M of UCI bits generated based on Downlink (DL) assignment(s) before the UL grant from the base station and a number N of UCI bits generated based on DL assignment(s) after the UL grant with a number P of UCI bits indicated in the UL grant and/or a maximum number Q of bits determined based on a maximum coding rate of UCI bits, an assumed resource size and an assumed modulation order, wherein each of M, N, P and Q is an integer equal to or larger than 0, and

wherein when P<(M+N)≤Q, the N UCI bits are multiplexed with the M UCI bits without compression at the user equipment.