Method of handling communication operation in communication system and related apparatus

• US 9,893,865 B2
• Filed: 12/22/2015
• Issued: 02/13/2018
• Est. Priority Date: 12/22/2014
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Hsieh, Chia-Wen
• Primary Examiner(s): Javaid, Jamal
• Assistant Examiner(s): Khawar, Saad
• Application Number:
  US14/977,655
• Publication Number:
  US 20160182204A1
• Time in Patent Office: 784 Days
• Field of Search: None
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

The disclosure proposes a method of handling communication operation in communication system and related apparatus. According to one of the exemplary embodiments, the disclosure proposes a method of handling a communication operation of a mobile device in a wireless communication system, applicable to the mobile device which is configured with a plurality of serving cells comprising a first serving cell and a second serving cell by a network of the wireless communication system. The method would include receiving a first transmission in a first subframe via the first serving cell and decoding the first transmission; generating a decoding result in response to decoding the first transmission; transmitting an acknowledgement (ACK) or negative-acknowledgement (NACK) in a second subframe, wherein the ACK or NACK corresponds to the decoding result; and receiving a second transmission in a third subframe via the second serving cell wherein the second transmission is a retransmission of the first transmission.

Claims

1. A method of handling a communication operation of a mobile device in a wireless communication system, applicable to the mobile device which is configured with a plurality of serving cells comprising a first serving cell and a second serving cell by a network of the wireless communication system, the method comprising:

receiving a first transmission in a first subframe via the first serving cell and decoding the first transmission;

generating a decoding result in response to decoding the first transmission;

storing at least one soft channel bit of the first transmission in at least one partitions of a soft buffer if the first transmission is not successfully decoded, wherein the soft buffer is divided into the plurality of partitions according to at least N_soft,N_{licensed cells}^DL,M_{DL_HARQ}, and M_limit, wherein N_soft is a size of the soft buffer, N_{licensed cells}^DL is a number of licensed serving cells configured to the mobile ceased cells device, M_{DL_HARQ} is a maximum number of DL HARQ processes and M_limit is a constant or a configurable parameter, wherein M_limit is determined according to at least one of the following;

whether one of the licensed serving cells assists one of unlicensed serving cells;

a number of unlicensed serving cells configured to the mobile device;

a traffic load category of the one of the unlicensed serving cells;

a congestion rate of the one of the unlicensed serving cells; and

a permutation of the traffic load category and the number of the unlicensed serving cells;

transmitting an acknowledgement (ACK) or negative-acknowledgement (NACK) in a second subframe, wherein the ACK or NACK corresponds to the decoding result; and

receiving a second transmission in a third subframe via the second serving cell wherein the second transmission is a retransmission of the first transmission.

2. The method of claim 1, wherein the first serving cell is either a licensed serving cell or an unlicensed serving cell.

3. The method of claim 1, wherein the second serving cell is either a licensed serving cell or an unlicensed serving cell.

4. The method of claim 1, wherein the first serving cell and the second serving cell are either the same or different.

5. The method of claim 1, wherein the second subframe is after the first subframe.

6. The method of claim 1, the third subframe is after the second subframe.

7. The method of claim 1, wherein the soft buffer is divided according to:

8. The method of claim 1, wherein M_limit is 12 if the one of the licensed serving cells assists the one of the unlicensed serving cell.

9. The method of claim 1, wherein M_limit is 12, 16, or 20 if the number of the unlicensed serving cells configured to the mobile device is 1, 2, or 3 respectively.

10. The method of claim 1, wherein M_limit is 16, 12, and 8 if the traffic load category of the one of the unlicensed serving cells is high, medium, and low respectively.

11. The method of claim 1, wherein M_limit is 8, 12, and 16 if the congestion rate of the one of the unlicensed serving cells is high, medium, and low respectively.

12. The method of claim 1, wherein M_limit is configured by a network via higher layer signaling or physical layer signaling.

13. The method of claim 12, the higher layer signaling is transmitted by radio resource control (RRC), system information block (SIB) or master information block (MIB).

14. The method of claim 12, the physical layer signaling is transmitted by downlink control information (DCI).

15. The method of claim 1, wherein the first serving cell and the second serving cell share a M_{DL_HARQ}.

16. The method of claim 15, wherein if the first serving cell is a frequency domain duplexing (FDD) DL serving cell and the second serving cell is an all DL serving cell, then the M_{DL_HARQ} is 16.

17. The method of claim 16, wherein if the mobile device is further configured with a third serving cell, then the M_{DL_HARQ is} 24.

18. The method of claim 15, wherein if both the first serving cell and the second serving cell are configured with uplink (UL)/DL configuration of 0, then the M_{DL_HARQ} is 8.

19. The method of claim 15, wherein if both the first serving cell and the second serving cell are configured with UL/DL configuration 5 then the M_{DL HARQ} is 30.

20. The method of claim 15, wherein if the first serving cell is configured with UL/DL configuration of 0 and the second serving cell is configured with UL/DL configuration of 5, then the M_{DL_HARQ} is 13.

21. The method of claim 15, wherein if the first serving cell is configured with UL/DL configuration of 0 and the second serving cell is an all DL serving cell then the M_{DL_HARQ} is 14.

22. The method of claim 15, wherein if the first serving cell is configured as a FDD DL serving cell and the second serving cell is configured with UL/DL configuration 0 then the M_{DL_HARQ} is 12.

23. The method of claim 1, wherein if the second subframe is a subframe with subframe number n, the first subframe is a subframe with subframe number n−

k where k is a positive integer.

24. The method of claim 23, wherein k is a constant.

25. The method of claim 23, wherein kε

K and K is a downlink association set index comprising at least one element.

26. The method of claim 25, wherein if the first serving cell is configured with UL/DL configuration 0, the downlink association set index (K) is determined according to a table below:

27. The method of claim 25, wherein if the first serving cell is configured with UL/DL configuration 1, the downlink association set index (K) is determined according to a table below:

28. The method of claim 25, wherein if the first serving cell is configured with UL/DL configuration 2, the downlink association set index (K) is determined according to a table below:

29. The method of claim 25, wherein if the first serving cell is configured with UL/DL configuration 3, the downlink association set index (K) is determined according to a table below:

30. The method of claim 25, wherein if the first serving cell is configured with UL/DL configuration 4, the downlink association set index (K) is determined according to a table below:

31. The method of claim 25, wherein if the first serving cell is configured with UL/DL configuration 5, the downlink association set index (K) is determined according to a table below:

32. The method of claim 25, wherein if the first serving cell is configured with UL/DL configuration 6, the downlink association set index (K) is determined according to a table below:

33. A method of handling a communication operation of a mobile device in a wireless communication system for a network of the wireless communication system, applicable to a network which configures the mobile device with a plurality of serving cells comprising a first serving cell and a second serving cell, the method comprising:

transmitting a first transmission in a first subframe via the first serving cell;

receiving an acknowledgement (ACK) or negative-acknowledgement (NACK) in a second subframe wherein the ACK or NACK is corresponding to the first transmission; and

transmitting a second transmission in a third subframe via the second serving cell wherein the second transmission is a retransmission of the first transmission, wherein if the second subframe is a subframe with subframe number n, the first subframe is a subframe with subframe number n−

k where k is a positive integer; and

kε

K, wherein K is a downlink association set index determined at least according to UL/DL configuration of the first serving cell and UL/DL configuration of the second serving cell.

34. The method of claim 33, wherein the first serving cell is either a licensed serving cell or an unlicensed serving cell.

35. The method of claim 33, wherein the second serving cell is either a licensed serving cell or an unlicensed serving cell.

36. The method of claim 33, the first serving cell and the second serving cell are the same or different.

37. The method of claim 33, the third subframe is after the second subframe.

38. The method of claim 33, wherein k is a constant.

39. The method of claim 33, wherein the downlink association set index (K) comprises at least one element.

40. The method of claim 39, wherein if the first serving cell is configured with UL/DL configuration 0, the downlink association set index (K) is determined according to a table below:

41. The method of claim 39, wherein if the first serving cell is configured with UL/DL configuration 1, the downlink association set index (K) is determined according to a table below:

42. The method of claim 39, wherein if the first serving cell is configured with UL/DL configuration 2, the downlink association set index (K) is determined according to a table below:

43. The method of claim 39, wherein if the first serving cell is configured with UL/DL configuration 3, the downlink association set index (K) is determined according to a table below:

44. The method of claim 39, wherein if the first serving cell is configured with UL/DL configuration 4, the downlink association set index (K) is determined according to a table below:

45. The method of claim 39, wherein if the first serving cell is configured with UL/DL configuration 5, the downlink association set index (K) is determined according to a table below:

46. The method of claim 39, wherein if the first serving cell is configured with UL/DL configuration 6, the downlink association set index (K) is determined according to a table below: