Scrambling sequence initialization for coordinated multi-point transmissions

• US 9,496,978 B2
• Filed: 11/21/2014
• Issued: 11/15/2016
• Est. Priority Date: 09/30/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Montojo, Juan, Luo, Tao, Chen, Wanshi
• Primary Examiner(s): KHAJURIA, SHRIPAL K
• Application Number:
  US14/549,898
• Publication Number:
  US 20150103807A1
• Time in Patent Office: 725 Days
• Field of Search: 370/335
• US Class Current: 1/1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04J 11/0053 using co-ordinated multipoint transmission/reception co-ordinated antenna or beam-forming aspects H04B7/022
• CPC Class Codes: H04J 13/10 Code generation

Abstract

Methods, systems, apparatus and computer program products are provided for generating a shared initialization code for physical channel data scrambling in an LTE Advanced coordinated multipoint transmission network. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the disclosed subject matter. Therefore, it is to be understood that it should not be used to interpret or limit the scope or the meaning of the claims.

Claims

1. A method, comprising:

transmitting a virtual cell identifier from a serving cell in a coordinated multi-point (CoMP) set to a user equipment (UE), wherein the virtual cell identifier is distinct from a cell identifier of the serving cell and is used for communications involving the CoMP set;

generating a UE-specific reference signal (UE-RS) sequence for the UE based at least in part on the virtual cell identifier; and

transmitting the UE-RS on a downlink channel.

2. The method of claim 1, further comprising:

transmitting the cell identifier of the serving cell.

3. The method of claim 2, further comprising:

generating a scrambling sequence based at least in part on the cell identifier of the serving cell;

scrambling data for downlink transmission based at least in part on the scrambling sequence; and

transmitting the scrambled data to the UE.

4. The method of claim 2, further comprising:

generating a second UE-RS sequence based at least in part on the cell identifier of the serving cell; and

transmitting the second UE-RS to a second UE.

5. The method of claim 1, wherein the UE-RS is generated without UE identification.

6. The method of claim 1, further comprising:

transmitting data scrambled with a scrambling sequence on a physical downlink shared channel (PDSCH), wherein the scrambling sequence is based at least in part on the cell identifier of the serving cell.

7. The method of claim 6, further comprising:

transmitting a virtual UE identifier from the serving cell, wherein the scrambling sequence is further based at least in part on the virtual UE identifier.

8. The method of claim 6, further comprising:

transmitting a codeword index and a transmission slot index from the serving cell, wherein the scrambling sequence is further based at least in part on the codeword index and the transmission slot index.

9. The method of claim 8, wherein the codeword index comprises one of a serving cell codeword index and a virtual codeword index, and the transmission slot index comprises one of a serving cell transmission slot index and a virtual transmission slot index.

10. The method of claim 1, further comprising:

receiving data scrambled with a scrambling sequence on a physical uplink shared channel (PUSCH), wherein the scrambling sequence is based at least in part on the cell identifier of the serving cell.

11. The method of claim 10, further comprising:

transmitting a virtual UE identifier from the serving cell, wherein the scrambling sequence is further based at least in part on the virtual UE identifier.

12. The method of claim 10, further comprising:

transmitting a transmission slot index from the serving cell, wherein the scrambling sequence is further based at least in part on the transmission slot index.

13. A communication device, comprising:

a processor; and

a memory comprising processor executable instructions that, when executed by the processor, configure the communication device to;

transmit a virtual cell identifier from a serving cell in a coordinated multi-point (CoMP) set to a user equipment (UE), wherein the virtual cell identifier is distinct from a cell identifier of the serving cell and is used for communications involving the CoMP set;

generate a UE-specific reference signal (UE-RS) sequence for the UE based at least in part on the virtual cell identifier; and

transmit the UE-RS on a downlink channel.

14. The communication device of claim 13, wherein the memory further comprises processor executable instructions that, when executed by the processor, configure the communication device to:

transmit the cell identifier of the serving cell.

15. The communication device of claim 14, wherein the memory further comprises processor executable instructions that, when executed by the processor, configure the communication device to:

generate a scrambling sequence based at least in part on the cell identifier of the serving cell;

scramble data for downlink transmission based at least in part on the scrambling sequence; and

transmit the scrambled data to the UE.

16. The communication device of claim 14, wherein the memory further comprises processor executable instructions that, when executed by the processor, configure the communication device to:

generate a second UE-RS sequence based at least in part on the cell identifier of the serving cell; and

transmit the second UE-RS to a second UE.

17. The communication device of claim 13, wherein the UE-RS is generated without UE identification.

18. The communication device of claim 13, wherein the memory further comprises processor executable instructions that, when executed by the processor, configure the communication device to:

transmit data scrambled with a scrambling sequence on a physical downlink shared channel (PDSCH), wherein the scrambling sequence is based at least in part on the cell identifier of the serving cell.

19. The communication device of claim 18, wherein the memory further comprises processor executable instructions that, when executed by the processor, configure the communication device to:

transmit a virtual UE identifier from the serving cell, wherein the scrambling sequence is further based at least in part on the virtual UE identifier.

20. The communication device of claim 18, wherein the memory further comprises processor executable instructions that, when executed by the processor, configure the communication device to:

transmit a codeword index and a transmission slot index from the serving cell, wherein the scrambling sequence is further based at least in part on the codeword index and the transmission slot index.

21. The communication device of claim 20, wherein the codeword index comprises one of a serving cell codeword index and a virtual codeword index, and the transmission slot index comprises one of a serving cell transmission slot index and a virtual transmission slot index.

22. The communication device of claim 13, wherein the memory further comprises processor executable instructions that, when executed by the processor, configure the communication device to:

receive data scrambled with a scrambling sequence on a physical uplink shared channel (PUSCH), wherein the scrambling sequence is based at least in part on the cell identifier of the serving cell.

23. The communication device of claim 22, wherein the memory further comprises processor executable instructions that, when executed by the processor, configure the communication device to:

transmit a virtual UE identifier from the serving cell, wherein the scrambling sequence is further based at least in part on the virtual UE identifier.

24. The communication device of claim 22, wherein the memory further comprises processor executable instructions that, when executed by the processor, configure the communication device to:

transmit a transmission slot index from the serving cell, wherein the scrambling sequence is further based at least in part on the transmission slot index.

25. A non-transitory computer-readable medium storing computer-executable program code, comprising:

program code for transmitting a virtual cell identifier from a serving cell in a coordinated multi-point (CoMP) set to a user equipment (UE), wherein the virtual cell identifier is distinct from a cell identifier of the serving cell and is used for communications involving the CoMP set;

program code for generating a UE-specific reference signal (UE-RS) sequence based at least in part on the virtual cell identifier; and

program code for transmitting the UE-RS on a downlink channel.

26. The non-transitory computer-readable medium of claim 25, wherein the computer-executable program code further comprises:

program code for transmitting the cell identifier of the serving cell.

27. The non-transitory computer-readable medium of claim 26, wherein the computer-executable program code further comprises:

program code for generating a scrambling sequence based at least in part on the cell identifier of the serving cell;

program code for scrambling data for downlink transmission based at least in part on the scrambling sequence; and

program code for transmitting the scrambled data to the UE.

28. The non-transitory computer-readable medium of claim 26, wherein the computer-executable program code further comprises:

program code for generating a second UE-RS sequence based at least in part on the cell identifier of the serving cell; and

program code for transmitting the second UE-RS to a second UE.

29. The non-transitory computer-readable medium of claim 25, wherein the UE-RS is generated without UE identification.

30. The non-transitory computer-readable medium of claim 25, wherein the computer-executable program code further comprises:

program code for transmitting data scrambled with a scrambling sequence on a physical downlink shared channel (PDSCH), wherein the scrambling sequence is based at least in part on the cell identifier of the serving cell.

31. The non-transitory computer-readable medium of claim 30, wherein the computer-executable program code further comprises:

program code for transmitting a virtual UE identifier from the serving cell, wherein the scrambling sequence is further based at least in part on the virtual UE identifier.

32. The non-transitory computer-readable medium of claim 30, wherein the computer-executable program code further comprises:

program code for transmitting a codeword index and a transmission slot index from the serving cell, wherein the scrambling sequence is further based at least in part on the codeword index and the transmission slot index.

33. The non-transitory computer-readable medium of claim 32, wherein the codeword index comprises one of a serving cell codeword index and a virtual codeword index, and the transmission slot index comprises one of a serving cell transmission slot index and a virtual transmission slot index.

34. The non-transitory computer-readable medium of claim 25, wherein the computer-executable program code further comprises:

program code for receiving data scrambled with a scrambling sequence on a physical uplink shared channel (PUSCH), wherein the scrambling sequence is based at least in part on the cell identifier of the serving cell.

35. The non-transitory computer-readable medium of claim 34, wherein the computer-executable program code further comprises:

program code for transmitting a virtual UE identifier from the serving cell, wherein the scrambling sequence is further based at least in part on the virtual UE identifier.

36. The non-transitory computer-readable medium of claim 34, wherein the computer-executable program code further comprises:

program code for transmitting a transmission slot index from the serving cell, wherein the scrambling sequence is further based at least in part on the transmission slot index.

37. A communication device, comprising:

means for transmitting a virtual cell identifier from a serving cell in a coordinated multi-point (CoMP) set to a user equipment (UE), wherein the virtual cell identifier is distinct from a cell identifier of the serving cell and is used for communications involving the CoMP set;

means for generating a UE-specific reference signal (UE-RS) sequence for the UE based at least in part on the virtual cell identifier; and

means for transmitting the UE-RS on a downlink channel.

38. The communication device of claim 37, further comprising:

means for transmitting the cell identifier of the serving cell.

39. The communication device of claim 38, further comprising:

means for generating a scrambling sequence based at least in part on the cell identifier of the serving cell;

means for scrambling data for downlink transmission based at least in part on the scrambling sequence; and

means for transmitting the scrambled data to the UE.

40. The communication device of claim 38, further comprising:

means for generating a second UE-RS sequence based at least in part on the cell identifier of the serving cell; and

means for transmitting the second UE-RS to a second UE.

41. The communication device of claim 37, wherein the UE-RS is generated without UE identification.

42. The communication device of claim 37, further comprising:

means for transmitting data scrambled with a scrambling sequence on a physical downlink shared channel (PDSCH), wherein the scrambling sequence is based at least in part on the cell identifier of the serving cell.

43. The communication device of claim 42, further comprising:

means for transmitting a virtual UE identifier from the serving cell, wherein the scrambling sequence is further based at least in part on the virtual UE identifier.

44. The communication device of claim 42, further comprising:

means for transmitting a codeword index and a transmission slot index from the serving cell, wherein the scrambling sequence is further based at least in part on the codeword index and the transmission slot index.

45. The communication device of claim 44, wherein the codeword index comprises one of a serving cell codeword index and a virtual codeword index, and the transmission slot index comprises one of a serving cell transmission slot index and a virtual transmission slot index.

46. The communication device of claim 37, further comprising:

means for receiving data scrambled with a scrambling sequence on a physical uplink shared channel (PUSCH), wherein the scrambling sequence is based at least in part on the cell identifier of the serving cell.

47. The communication device of claim 46, further comprising:

means for transmitting a virtual UE identifier from the serving cell, wherein the scrambling sequence is further based at least in part on the virtual UE identifier.

48. The communication device of claim 46, further comprising:

means for transmitting a transmission slot index from the serving cell, wherein the scrambling sequence is further based at least in part on the transmission slot index.