User equipment and method for grant-free uplink transmission

1. A method of grant-free uplink transmission for a user equipment, comprising:

receiving a grant-free configuration parameter by the user equipment;

receiving at least one reference signal by the user equipment;

performing channel measurement based on the at least one reference signal by the user equipment;

deciding at least one uplink beamforming weight or at least one precoder based on the at least one reference signal by the user equipment; and

performing grant-free uplink transmission based on the decided at least one uplink beamforming weight or the at least one precoder and the grant-free configuration parameter by the user equipment.

2. The method of claim 1 , wherein the grant-free configuration parameter comprises any combination of the following parameters: a code rate, a modulation order, a transport block size, a physical resource block size, a configured resource, a downlink reference signal related configuration, an uplink reference signal related configuration, a number of rank.

3. The method of claim 2 , wherein deciding the code rate, the modulation order, the transport block size, and the physical resource block size is based on any combination of the followings: a transmission occasion within a transmission period, a number of transmission repetitions within the transmission period, a redundancy version sequence, a repetition pattern and a configured uplink transmission resource.

4. The method of claim 1 , wherein each of the at least one reference signal comprises any combination of the followings: an uplink reference signal and a downlink reference signal.

5. The method of claim 1 , wherein,

the at least one reference signal corresponds to at least one uplink transmission resource;

the step of deciding the at least one uplink beamforming weight or the at least one precoder by the user equipment based on the at least one reference signal comprises:

receiving a reference signal index control signaling by the user equipment; and

deciding, by the user equipment, the at least one uplink beamforming weight or the at least one precoder based on the reference signal indicated by the reference signal index control signaling; and

the method further comprises:

choosing, by the user equipment, one among the at least one uplink transmission resource based on the reference signal indicated by the reference signal index control signaling, wherein the user equipment further performs grant-free uplink transmission based on the chosen at least one uplink transmission resource.

6. The method of claim 5 , wherein,

the user equipment receives a plurality of reference signals, and the step of the user equipment performing channel measurement based on the plurality of reference signals comprises reporting a channel measurement result, and the step of deciding the at least one uplink beamforming weight or the at least one precoder by the user equipment based on the plurality of reference signals further comprises: in response to the reported channel measurement result, receiving the reference signal index control signaling by the user equipment.

7. The method of claim 6 , wherein the user equipment wirelessly communicates with a base station, and the method further comprises:

transmitting the reference signal index control signaling by the base station to the user equipment based on the channel measurement result received from the user equipment.

8. The method of claim 1 , wherein,

the at least one reference signal corresponds to at least one uplink transmission resource, and the method further comprises:

choosing one among the at least one reference signal by the user equipment based on a channel measurement result; and

choosing one among the at least one uplink transmission resource by the user equipment based on the chosen at least one reference signal to perform grant-free uplink transmission.

9. The method of claim 8 , wherein the step of deciding the at least one uplink beamforming weight or the at least one precoder by the user equipment based on the at least one reference signal further comprises:

deciding the at least one uplink beamforming weight or the at least one precoder by the user equipment based on the chosen at least one reference signal.

10. The method of claim 8 , wherein the user equipment wirelessly communicates with a base station, and the method further comprises:

transmitting a reference signal index control signaling by the base station to the user equipment based on the channel measurement result received from the user equipment.

11. The method of claim 1 , wherein,

the user equipment receives a plurality of reference signals, and a plurality of channels are measured based on the plurality of reference signals, and the step of deciding the at least one uplink beamforming weight or the at least one precoder by the user equipment based on the at least one reference signal comprises:

deciding a plurality of uplink beamforming weights or a plurality of precoders by the user equipment based on a channel measurement result;

receiving a reference signal index control signaling by the user equipment; and

choosing one among the plurality of uplink beamforming weights or the plurality of precoders by the user equipment based on the reference signal index control signaling,

wherein the user equipment performs grant-free uplink transmission based on the chosen uplink beamforming weight or the chosen precoder.

12. The method of claim 11 , wherein the step of deciding the at least one uplink beamforming weight or the at least one precoder by the user equipment based on the at least one reference signal further comprises:

transmitting, by the user equipment, a plurality of uplink reference signals through the plurality of channels, respectively, based on the decided at least one uplink beamforming weight or the at least one precoder, wherein in response to transmission of the plurality of uplink reference signals, the user equipment receives the reference signal index control signaling.

13. The method of claim 1 , wherein,

the user equipment decides a number of transmission repetitions and/or a resource usage and/or a data quantity per transmission based on a transmission occasion within a transmission period to perform grant-free uplink transmission.

14. The method of claim 1 , wherein the user equipment wirelessly communicates with a base station, and the method further comprises:

transmitting the grant-free configuration parameter and the at least one reference signal by the base station.

15. A method of grant-free uplink transmission for a user equipment, comprising:

deciding a number of transmission repetitions and/or a resource usage and/or a data quantity per transmission based on a transmission occasion within a transmission period by the user equipment; and

performing grant-free uplink transmission based on the number of transmission repetitions and/or the resource usage and/or the data quantity per transmission by the user equipment.

16. The method of claim 15 , further comprising:

receiving a grant-free configuration parameter by the user equipment;

receiving at least one reference signal by the user equipment;

performing channel measurement based on the at least one reference signal by the user equipment; and

deciding at least one uplink beamforming weight or at least one precoder based on a channel measurement result by the user equipment,

wherein the user equipment performs grant-free uplink transmission based on the number of transmission repetitions and/or the resource usage and/or the data quantity per transmission and the at least one uplink beamforming weight or the at least one precoder.

17. The method of claim 15 , wherein the data quantity per transmission is a constant value, and the user equipment decides the number of transmission repetitions and the resource usage based on the transmission occasion within the transmission period.

18. The method of claim 15 , wherein the resource usage is a constant value, and the user equipment decides the number of transmission repetitions and the data quantity per transmission based on the transmission occasion within the transmission period.

19. The method of claim 15 , wherein the user equipment decides the number of transmission repetitions, the resource usage, and the data quantity per transmission based on the transmission occasion within the transmission period.

20. The method of claim 15 , wherein the user equipment further decides the number of transmission repetitions and the data quantity per transmission based on a data quantity to be transmitted.

21. The method of claim 15 , wherein the user equipment further decides the data quantity per transmission based on a channel quality, and the user equipment reports the decided data quantity per transmission.

22. A user equipment, comprising:

a controller; and

a wireless communication module coupled to the controller, and the controller is configured to control:

receiving a grant-free configuration parameter by the user equipment;

receiving at least one reference signal by the user equipment;

performing channel measurement based on the at least one reference signal by the user equipment;

deciding at least one uplink beamforming weight or at least one precoder based on the at least one reference signal by the user equipment; and

performing grant-free uplink transmission based on the decided at least one uplink beamforming weight or the at least one precoder and the grant-free configuration parameter by the user equipment.

23. The user equipment of claim 22 , wherein the grant-free configuration parameter comprises any combination of the following parameters: a code rate, a modulation order, a transport block size, a physical resource block size, a configured resource, a downlink reference signal related configuration, an uplink reference signal related configuration, a number of rank.

24. The user equipment of claim 22 , wherein deciding the code rate, the modulation order, the transport block size, and the physical resource block size is based on any combination of the followings: a transmission occasion within a transmission period, a number of transmission repetitions within the transmission period, a redundancy version sequence, a repetition pattern and a configured uplink transmission resource.

25. The user equipment of claim 22 , wherein each of the at least one reference signal comprises any combination of the followings: an uplink reference signal and a downlink reference signal.

26. The user equipment of claim 22 , wherein,

the controller is configured to control:

corresponding the at least one reference signal to at least one uplink transmission resource;

when the user equipment decides the at least one uplink beamforming weight or the at least one precoder based on the at least one reference signal,

the user equipment receives a reference signal index control signaling; and

the user equipment decides the at least one uplink beamforming weight or the at least one precoder based on the at least one reference signal indicated by the reference signal index control signaling; and

the user equipment chooses one among the at least one uplink transmission resource based on the at least one reference signal indicated by the reference signal index control signaling, wherein the user equipment further performs grant-free uplink transmission based on the chosen at least one uplink transmission resource.

27. The user equipment of claim 26 , wherein,

the controller is configured to control:

receiving the at least one reference signal by the user equipment, and performing channel measurement by the user equipment based on the at least one reference signal, and reporting a channel measurement result; and

when the user equipment decides the at least one uplink beamforming weight or the at least one precoder based on the at least one reference signal, in response to the reported channel measurement result, the user equipment receives the reference signal index control signaling.

28. The user equipment of claim 27 , wherein the user equipment wirelessly communicates with a base station, the base station transmits the reference signal index control signaling to the user equipment based on the channel measurement result received from the user equipment.

29. The user equipment of claim 22 , wherein,

the controller is configured to control:

corresponding the at least one reference signal to at least one uplink transmission resource;

choosing one among the at least one reference signal by the user equipment based on a channel measurement result; and

choosing one among the at least one uplink transmission resource by the user equipment based on the chosen at least one reference signal to perform grant-free uplink transmission.

30. The user equipment of claim 29 , wherein when the user equipment decides the at least one uplink beamforming weight or the at least one precoder based on the at least one reference signal, the user equipment decides the at least one uplink beamforming weight or the at least one precoder based on the chosen at least one reference signal.

31. The user equipment of claim 29 , wherein the user equipment wirelessly communicates with a base station, the base station transmits a reference signal index control signaling to the user equipment based on the channel measurement result received from the user equipment.

32. The user equipment of claim 22 , wherein the controller is configured to control:

receiving the at least one reference signal by the user equipment, and measuring a plurality of channels based on the at least one reference signal by the user equipment,

when the user equipment decides the at least one uplink beamforming weight or the at least one precoder based on the at least one reference signal,

the user equipment decides the at least one uplink beamforming weight or the at least one precoder based on a channel measurement result;

the user equipment receives a reference signal index control signaling; and

the user equipment chooses one among the at least one uplink beamforming weight or the at least one precoder based on the reference signal index control signaling;

wherein the user equipment performs grant-free uplink transmission based on the chosen at least one uplink beamforming weight or the at least one precoder.

33. The user equipment of claim 32 , wherein,

the controller is configured to control:

when the user equipment decides the at least one uplink beamforming weight or the at least one precoder based on the at least one reference signal, the user equipment transmits a plurality of uplink reference signals through the plurality of channels, respectively, based on the decided at least one uplink beamforming weight or the at least one precoder, wherein in response to transmission of the plurality of uplink reference signals, the user equipment receives the reference signal index control signaling.

34. The user equipment of claim 22 , wherein,

the user equipment decides a number of transmission repetitions and/or a resource usage and/or a data quantity per transmission based on a transmission occasion within a transmission period.

35. The user equipment of claim 22 , wherein the user equipment wirelessly communicates with a base station, and the base station transmits the grant-free configuration parameter and the at least one reference signal.

36. A user equipment, comprising:

a controller; and

a wireless communication module coupled to the controller, and the controller is configured to control:

deciding a number of transmission repetitions and/or a resource usage and/or a data quantity per transmission based on a transmission occasion within a transmission period by the user equipment; and

performing grant-free uplink transmission based on the number of transmission repetitions and/or the resource usage and/or the data quantity per transmission by the user equipment.

37. The user equipment of claim 36 , wherein the controller controls:

receiving a grant-free configuration parameter by the user equipment;

receiving at least one reference signal by the user equipment;

performing channel measurement by the user equipment based on the at least one reference signal; and

deciding at least one uplink beamforming weight or at least one precoder by the user equipment based on a channel measurement result,

wherein the user equipment performs grant-free uplink transmission based on the number of transmission repetitions and/or the resource usage and/or the data quantity per transmission and the at least one uplink beamforming weight or the at least one precoder.

38. The user equipment of claim 36 , wherein the data quantity per transmission is a constant value, and the controller controls the user equipment to decide the number of transmission repetitions and the resource usage based on the transmission occasion within the transmission period.

39. The user equipment of claim 36 , wherein the resource usage is a constant value, and the controller controls the user equipment to decide the number of transmission repetitions and the data quantity per transmission based on the transmission occasion within the transmission period.

40. The user equipment of claim 36 , wherein the controller controls the user equipment to decide the number of transmission repetitions, the resource usage, and the data quantity per transmission based on the transmission occasion within the transmission period.

41. The user equipment of claim 36 , wherein the controller controls the user equipment to further decide the number of transmission repetitions and the data quantity per transmission based on a data quantity to be transmitted.

42. The user equipment of claim 36 , wherein the controller controls the user equipment to further decide the data quantity per transmission based on a channel quality, and the user equipment reports the decided data quantity per transmission.