SCRAMBLING UNDER AN EXTENDED PHYSICAL-LAYER CELL IDENTITY SPACE

• US 20090323957A1
• Filed: 06/24/2009
• Published: 12/31/2009
• Est. Priority Date: 06/25/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Luo, Tao, Montojo, Juan, Chen, Wanshi
• Granted Patent: US 8,654,623 B2
• Time in Patent Office: Days
• US Class Current: 380/270
• CPC Class Codes: H04J 11/0069 Cell search, i.e. determining cell identity [cell-ID] design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655
• CPC Class Codes: H04L 25/03866 using scrambling
• CPC Class Codes: H04W 72/0466 the resource being a scrambling code

Abstract

A method for wireless communications is provided. The method includes determining a set of physical layer cell identities and analyzing a current set of scrambling sequences. The method increases the current set of scrambling sequences to account for increases in the physical layer cell identities.

Claims

1. A method for wireless communications, comprising:

determining a set of physical layer cell identities;

analyzing a current set of scrambling sequences; and

increasing the current set of scrambling sequences to account for increases in the physical layer cell identities.

2. The method of claim 1, further comprising increasing the current set of scrambling sequences by N, where N is an integer and employed as a binary power to raise the number of scrambling sequences in the current set.

3. The method of claim 1, the further comprising increasing the current set by adding an extension element I to the current set of scrambling sequences, where I is an integer and indicates whether to apply the scrambling sequences to the set of physical layer cell identities or to an extended set of physical layer cell identities.

4. The method of claim 1, further comprising adding N bits to a scrambling sequence initialization, where N is an integer and the N bits indicate additional bits due to a physical layer cell identity space increase.

5. The method of claim 4, the N bits are linked to an increase in cell identifiers employed in the scrambling sequence initialization.

6. The method of claim 5, the N bits indicate an arrangement of Primary Synchronization Codes (PSC) and Secondary Synchronization Codes (SSC).

7. The method of claim 6, if N is set to a value of (1), then PSC/SSC are swapped in order, if N is set to a value of (0), then PSC/SSC apply in an original order.

8. The method of claim 6, one or more of the N bits are distributed in differing portions of a scrambling sequence.

9. The method of claim 6, the N bits are applied to a primary reference signal (PRS), a scrambling function, or a hopping function.

10. The method of claim 1, further comprising maintaining the current set of scrambling sequences in addition to an extended set of scrambling sequences in order to support legacy systems.

11. The method of claim 1, the scrambling sequences are associated with a wireless physical layer.

12. The method of claim 1, the scrambling sequences are associated with a physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH).

13. The method of claim 1, the scrambling sequences are associated with a physical multicast channel (PMCH) or a physical control format indicator channel (PCFICH).

14. The method of claim 1, the scrambling sequences are associated with a physical downlink control channel (PDCCH) or a physical hybrid ARQ indicator channel (PHICH).

15. The method of claim 1, the scrambling sequences are associated with a downlink cell-specific format, a user equipment-specific format, or a multicast broadcast single frequency network (MBSFN) format.

16. A communications apparatus, comprising:

a memory that retains instructions for determining a set of physical layer cell identities, generating a current set of scrambling sequences, and automatically increasing the current set of scrambling sequences to account for increases in the physical layer cell identities; and

a processor that executes the instructions.

17. The communications apparatus of claim 16, further comprising an instruction to increase the current set of scrambling sequences by N, where N is an integer and employed as a binary power to raise the number of scrambling sequences in the current set.

18. The communications apparatus of claim 16, the further comprising an instruction to increase the current set by adding an extension element I to the current set of scrambling sequences, where I is an integer and indicates whether to apply the scrambling sequences to the set of physical layer cell identities or to an extended set of physical layer cell identities.

19. The communications apparatus of claim 18, further comprising an bits that indicate Primary Synchronization Codes (PSC) and Secondary Synchronization Codes (SSC).

20. The communications apparatus of claim 16, the scrambling sequences are associated with a wireless physical layer, a channel, or a device.

34. The communications apparatus of claim 16, the further comprising processing an instruction to increase the current set by adding an extension element I to the current set of scrambling sequences, where I is an integer and indicates whether to apply the scrambling sequences to the set of physical layer cell identities or to an extended set of physical layer cell identities.

21. A communications apparatus, comprising:

means for generating a set of physical layer cell identities;

means for extending a current set of scrambling sequences; and

means for increasing a number of the current set of scrambling sequences to account for an increased number of physical layer cell identities.

22. The communications apparatus of claim 21, the means for extending further comprising an instruction to increase the current set of scrambling sequences by N, where N is an integer and employed as a binary power to raise the number of scrambling sequences in the current set.

23. The communications apparatus of claim 21, the means for extending further comprising an instruction to increase the current set by adding an extension element I to the current set of scrambling sequences, where I is an integer and indicates whether to apply the scrambling sequences to the set of physical layer cell identities or to an extended set of physical layer cell identities.

24. A computer program product comprising:

a computer-readable medium that includes code for extending scrambling sequences, the code comprising;

code for causing a computer to generate a set of physical layer cell identities;

code for causing a computer to extend a current set of scrambling sequences; and

code for causing a computer to increase a number of the current set of scrambling sequences to account for a number of physical layer cell identities.

25. The computer program product of claim 24, further comprising an extension sequence that employs a raised power factor to increase the number of the current set of scrambling sequences.

26. The computer program product of claim 24, further comprising an extension integer that is employed to select the current set of scrambling sequences or an extended set of scrambling sequences.

27. A processor that executes the following instructions:

processing a set of physical layer cell identities;

extending a current set of scrambling sequences; and

increasing a number of the current set of scrambling sequences to account for a number of physical layer cell identities.

28. The processor of claim 27, further comprising a selection element to automatically increase scrambling sequence identities.

29. A method for wireless communications, comprising:

processing a set of physical layer cell identities;

processing a current set of scrambling sequences; and

receiving an extended set of scrambling sequences to account for increases in the physical layer cell identities.

30. The method of claim 29, further comprising processing the current set of scrambling sequences by N, where N is an integer and employed as a binary power to raise the number of scrambling sequences in the current set.

31. The method of claim 29, the further comprising processing the current set by adding an extension element I to the current set of scrambling sequences, where I is an integer and indicates whether to apply the scrambling sequences to the set of physical layer cell identities or to an extended set of physical layer cell identities.

32. A communications apparatus, comprising:

a memory that retains instructions for determining a set of physical layer cell identities, processing a current set of scrambling sequences, and processing an extended set of scrambling sequences to account for increases in the physical layer cell identities; and

a processor that executes the instructions.

33. The communications apparatus of claim 32, further comprising processing an instruction to increase the current set of scrambling sequences by N, where N is an integer and employed as a binary power to raise the number of scrambling sequences in the current set.

35. A communications apparatus, comprising:

means for processing a set of physical layer cell identities;

means for processing a current set of scrambling sequences; and

means for processing an extended set of scrambling sequences to account for an extended number of physical layer cell identities.

36. The communications apparatus of claim 35, further comprising an instruction to increase the current set of scrambling sequences by N, where N is an integer and employed as a binary power to raise the number of scrambling sequences in the current set.

37. The communications apparatus of claim 35, further comprising an instruction to increase the current set by adding an extension element I to the current set of scrambling sequences, where I is an integer and indicates whether to apply the scrambling sequences to the set of physical layer cell identities or to an extended set of physical layer cell identities.

38. A computer program product comprising:

a computer-readable medium that includes code for extending scrambling sequences, the code comprising;

code for causing a computer to process a set of physical layer cell identities;

code for causing a computer to extend a current set of scrambling sequences; and

code for causing a computer to process a number of extended scrambling sequences to account for a number of extended physical layer cell identities.

39. The computer program product of claim 38, further comprising an extension sequence that employs a raised power factor to increase the number of the current set of scrambling sequences.

40. The computer program product of claim 38, further comprising an extension integer that is employed to select the current set of scrambling sequences or an extended set of scrambling sequences.

41. A processor that executes the following instructions:

processing a set of physical layer cell identities;

extending a current set of scrambling sequences; and

processing an extended number of scrambling sequences to account for an extended number of physical layer cell identities.

42. The processor of claim 41, further comprising a selection instruction to automatically increase scrambling sequence identities.