Bidirectional sidelink communications enhancement

1. A method for sidelink wireless communications comprising:

receiving, by a first user equipment (UE), configuration parameters, of a cell for sidelink communications with a second UE, the configuration parameters comprising:

first configuration parameters of a first bandwidth part (BWP) of the cell for transmission of one or more first sidelink signals and channels by the first UE to the second UE; and

second configuration parameters of a second BWP of the cell for reception of one or more second sidelink signals and channels by the first UE from the second UE,

wherein:

the first configuration parameters indicate first radio resources of the cell and a first numerology for the first BWP of the cell for the transmission of the one or more first sidelink signals; and

the second configuration parameters indicate second radio resources of the cell and a second numerology for the second BWP of the cell for the transmission of the one or more second sidelink signals;

transmitting, by the first UE, the one or more first sidelink signals and channels via the first BWP and based on the first configuration parameters; and

receiving, by the first UE, the one or more second sidelink signals and channels via the second BWP and based on the second configuration parameters.

2. The method of claim 1 further comprising receiving, by the first UE, third configuration parameters of a third BWP of the cell for uplink transmissions to a base station.

3. The method of claim 2 , wherein:

the third configuration parameters define a third numerology for the third BWP; and

the first UE expects that the third numerology is equal to the first numerology.

4. The method of claim 1 , wherein the cell is in a frequency band associated with the sidelink communications.

5. The method of claim 1 , wherein the one or more first signals and channels comprise one or more of:

a first physical sidelink shared channel (PSSCH);

a first physical sidelink control channel (PSCCH);

a first physical sidelink feedback channel (PSFCH);

a first sidelink primary synchronization signal (S-PSS); and

a first sidelink secondary synchronization signal (S-SSS).

6. The method of claim 1 , wherein the one or more second signals and channels comprise one or more of:

a second PSSCH;

a second PSCCH;

a second PSFCH;

a second S-PSS; and

a second S-SSS.

7. The method of claim 1 , wherein:

the first configuration parameters define a first frequency domain location and a first bandwidth of the first BWP; and

the second configuration parameters define a second frequency domain location and a second bandwidth of the second BWP.

8. The method of claim 1 , wherein:

the first configuration parameters define a first subcarrier spacing and a first symbol duration of the first BWP; and

the second configuration parameters define a second subcarrier spacing and a second symbol duration of the second BWP.

9. The method of claim 1 further comprising:

transmitting, by the first UE to a base station, a capability message comprising an information element indicating that the first UE is capable of transmitting and receiving sidelink communications using different bandwidth parts (BWPs) of a cell,

wherein the configuration parameters are received by the first UE, from the base station, in response to the first UE transmitting the capability message.

10. The method of claim 1 further comprising:

transmitting, by the first UE to a base station, a capability message comprising an information element indicating that the first UE is capable of transmitting sidelink communications via multiple BWPs of a cell; and

in response to transmitting the capability message, receiving, by the first UE, third configuration parameters of a third BWP of the cell for transmission of one or more third sidelink signals and channels to a third UE.

11. The method of claim 1 further comprising:

receiving third configuration parameters of a third BWP of the cell for transmission of one or more third sidelink signals and channels by the first UE to a third UE,

wherein:

transmission of the one or more first sidelink signals and channels via the first BWP is associated with a first priority; and

transmission of the one or more third sidelink signals and channels via the third BWP is associated with a second priority.

12. The method of claim 11 , wherein:

the first configuration parameters comprise a first priority parameter indicating the first priority; and

the third configuration parameters comprise a second priority parameter indicating the second priority.

13. The method of claim 11 , further comprising selecting, based on the first priority and the second priority, one of:

first transmission of a first sidelink signal or sidelink channel via the first BWP; and

second transmission of a third sidelink signal or sidelink channels via the third BWP.

14. The method of claim 13 , wherein selecting one of the first transmission or the second transmission is based on the first UE not being capable of simultaneously transmitting the first transmission and the second transmission.

15. The method of claim 1 further comprising:

receiving third configuration parameters of a third BWP of the cell for transmission of one or more third sidelink signals and channels by the first UE to a third UE;

receiving a downlink control information, the downlink control information including

a field indicating one of the first BWP or the third BWP, and scheduling information for a sidelink signal or channel; and

transmitting the sidelink signal or channel via one of the first BWP or the third BWP, based at least in part, on the downlink control information.

16. The method of claim 1 , wherein:

transmitting the one or more first sidelink signals and channels includes transmitting the one or more first sidelink signals and channels based on a first time pattern; and

receiving the one or more second sidelink signals and channels includes receiving the one or more second sidelink signals and channels based on a second time pattern.

17. The method of claim 16 , wherein the first time pattern and the second time pattern are configured to avoid simultaneous transmission on the first BWP and reception on the second BWP.

18. The method of claim 16 , wherein:

the first configuration parameters indicate the first time pattern; and

the second configuration parameters indicate the second time pattern.

19. The method of claim 16 , wherein the first time pattern is based on a first bitmap, wherein a value of a first bit in the first bitmap indicates whether a first symbol corresponding to the first bit can be used for transmission of the one or more first sidelink signals and channels, and wherein the first configuration parameters indicate the first bitmap.

20. The method of claim 16 , wherein the second time pattern is based on a second bitmap, and wherein a value of a second bit in the second bitmap indicates whether a second symbol corresponding to the second bit can be used for reception of the one or more second sidelink signals and channels, and

the second configuration parameters indicate the second bitmap.

21. The method of claim 16 , wherein:

the first time pattern is based on a first periodicity and wherein the first configuration parameters include the first periodicity; and

the second time pattern is based on a second periodicity and wherein the second configuration parameters indicate the second periodicity.

22. The method of claim 16 , wherein:

the first time pattern is based on a first start symbol parameter and a first length parameter and wherein the first configuration parameters indicate the first start symbol parameter and the first length parameter; and

the second time pattern is based on a second start symbol parameter and a second length parameter and wherein

the second configuration parameters indicate the second start symbol parameter and the second length parameter.