Methods and systems for processing overhead reduction for control channel packets

• US 8,374,200 B2
• Filed: 06/25/2007
• Issued: 02/12/2013
• Est. Priority Date: 06/21/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gorokhov, Alexei, Khandekar, Aamod, Borran, Mohammad J., Prakash, Rajat, Palanki, Ravi
• Primary Examiner(s): Zewdu, Meless N
• Assistant Examiner(s): Sarwar, Babar
• Application Number:
  US11/768,135
• Publication Number:
  US 20070297379A1
• Time in Patent Office: 2,059 Days
• Field of Search: 370/232, 370/280, 370328-329, 370335-336, 370/338, 370341-342, 370/349, 370/310.1, 370/345, 370/347, 370270-274, 370/230, 370/389, 370/392, 370/474, 370/216, 370/473, 370/476, 370/471, 455/442, 455/452.2, 455/522, 455/450, 455/509, 455/464, 380247-250, 714/48, 714/746, 714/749, 714/751, 714/776, 714/774
• US Class Current: 370/474
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/0078 Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location forward error control, e.g. FEC, CRC H04L1/004; adaptive formatting H04L1/0006; mappings H04L27/00

Abstract

Various methods and systems receiving information from an access point over a wireless link in order to reduce processing and/or transmission overhead are disclosed. Such methods and systems may include the processing of a received packet using a descrambling operation on at least a portion of the packet'"'"'s information based on a MAC-ID associated with an access terminal to produce at least a first processed packet, and determining whether the received packet is targeted to the access terminal based on the first processed packet.

Claims

1. A method for receiving information from an access point over a wireless link, comprising:

receiving a packet comprising payload data and error detection data;

processing the received packet using at least a descrambling operation on only the error detection data based on a first identifier associated with an access terminal to produce a processed packet, the error detection data having a 16-bit length, the first identifier having a 16-bit length matching the 16-bit length of the error detection data, and the descrambling operation being performed on only 16 bits of the error detection data based on 16 bits of the first identifier; and

determining whether the received packet is targeted to the access terminal based on the processed packet.

2. The method of claim 1, wherein the step of processing further includes a decoding operation on the received packet.

3. The method of claim 1, wherein the step of processing includes first decoding the received packet to produce a decoded packet, then descrambling the error detection data from the decoded packet.

4. The method of claim 3, wherein the step of processing further includes determining whether the received packet is decoded correctly or in error based on descrambled error detection data.

5. The method of claim 1, wherein the step of determining includes determining whether the received packet is targeted to the access terminal based on descrambled error detection data.

6. The method of claim 1, wherein the error detection data includes a checksum derived from the payload data.

7. The method of claim 6, wherein the first identifier comprises a media access controller (MAC) identifier (MAC-ID) of the access terminal.

8. The method of claim 7, wherein the MAC-ID of the access terminal comprises a MAC-ID assigned to the access terminal.

9. The method of claim 7, wherein the checksum is descrambled by adding or subtracting the MAC-ID to or from the checksum.

10. The method of claim 7, wherein the checksum is descrambled by performing a logical operation on the checksum based on the MAC-ID.

11. The method of claim 7, wherein the checksum is descrambled by performing a shift-register based operation based on the MAC-ID.

12. The method of claim 6, wherein the first identifier comprises a broadcast media access controller identifier (MAC-ID).

13. The method of claim 6, wherein the step of processing causes only the checksum to be descrambled.

14. The method of claim 1, further comprising:

determining resources allocated to the access terminal based on the received packet if the received packet is targeted to the access terminal.

15. The method of claim 1, wherein the error detection data is descrambled by adding or subtracting the first identifier to or from the error detection data.

16. The method of claim 1, wherein the error detection data is descrambled by performing a shift-register based operation.

17. The method of claim 1, wherein the error detection data is descrambled by performing a linear operation.

18. The method of claim 1, wherein the step of processing includes:

performing a first descrambling operation based on a media access controller identifier (MAC-ID) specifically associated with the access terminal to produce a first processed packet; and

performing a second descrambling operation based on a broadcast MAC-ID to produce a second processed packet.

19. The method of claim 18, wherein the step of determining includes determining whether the received packet is targeted to the access terminal based on both the MAC-ID specific to the access terminal and the broadcast MAC-ID.

20. The method of claim 1, wherein the pay load data comprises control information.

21. An integrated circuit that performs the method of claim 1.

22. A Media Access Controller (MAC) that performs the method of claim 1.

23. A computer-readable memory containing a plurality of instructions that, when accessed by a computer, enables the computer to perform the steps of:

receiving a packet comprising payload data and error detection data;

processing the received packet using at least a descrambling operation on only the error detection data based on a first identifier associated with an access terminal to produce a processed packet, the error detection data having a 16-bit length, the first identifier having a 16-bit length matching the 16-bit length of the error detection data, and the descrambling operation being performed on only 16 bits of the error detection data based on 16 bits of the first identifier; and

determining whether the received packet is targeted to the access terminal based on the processed packet.

24. The computer-readable memory of claim 23, wherein the processing instructions further include a decoding operation on the received packet.

25. The computer-readable memory of claim 23, wherein the processing instructions include a decoding operation on the received packet to produce a decoded packet, then a descrambling operation on the error detection data from the decoded packet.

26. The computer-readable memory of claim 23, wherein the determining instructions include determining whether the decoded packet is targeted to the access terminal based on descrambled error detection data.

27. The computer-readable memory of claim 23, wherein the first identifier comprises a media access controller (MAC) identifier (MAC-ID) assigned specifically to the access terminal or a broadcast MAC-ID.

28. The computer-readable memory of claim 23, wherein the error detection data is descrambled by performing at least one of a linear operation, an addition operation, a subtraction operation, a shift-register based operation, or a mapping operation.

29. The computer-readable memory of claim 23, wherein the payload data comprises control information.

30. An apparatus for receiving information from an access point over a wireless link, comprising:

a media access controller (MAC) with a processing circuit and a memory in communication with the processing circuit, wherein the MAC is configured to receive a packet comprising payload data and error detection data, and to process the received packet by performing a descrambling operation on only the error detection data based on a MAC identification (MAC-ID), the error detection data having a 16-bit length, the MAC-ID having a 16-bit length matching the 16-bit length of the error detection data, and the descrambling operation being performed on only 16 bits of the error detection data based on 16 bits of the MAC-ID.

31. The apparatus of claim 30, wherein the MAC is further configured to perform a decoding operation on the received packet to produce a decoded packet, then a descrambling operation on the error detection data from the decoded packet.

32. The apparatus of claim 30, wherein the MAC is further configured to perform descrambling based on at least one of a linear operation, an addition operation, a subtraction operation, a shift-register based operation, or a mapping operation.

33. The apparatus of claim 30, wherein the error detection data includes a checksum derived from the payload data.

34. The apparatus of claim 30, wherein the payload data Comprises control information.

35. An apparatus for receiving information from an access point over a wireless link, comprising:

a computer-readable memory for storing a packet comprising payload data and error detection data; and

a determining means in communication with the memory for determining whether the packet residing in the memory is intended for the apparatus based on a descrambling operation on only the error detection data in the packet using a Media Access Controller Identifier (MAC-ID), the error detection data having a 16-bit length, the MAC-ID having a 16-bit length matching the 16-bit length of the error detection data, and the descrambling operation being performed on only 16 bits of the error detection data based on 16 bits of the MAC-ID.

36. The apparatus of claim 35, wherein the determining means includes a decoding means for performing a decoding operation on the received packet to produce a decoded packet, and a descrambling means for performing the descrambling operation on the error detection data from the decoded packet.

37. The apparatus of claim 36, wherein the determining means includes a means for determining whether the packet is decoded correctly or in error based on descrambled error detection data.

38. The apparatus of claim 35, wherein the error detection data includes a checksum derived from the payload data.

39. The apparatus of claim 35, wherein the payload data comprises control information.

40. A method for transmitting information to an access terminal over a wireless link, comprising:

obtaining a packet comprising payload data and error detection data;

processing the packet by applying at least a scrambling operation on only the error detection data based on a first identifier associated with an intended access terminal to produce a processed packet, the error detection data having a 16-bit length, the first identifier having a 16-bit length matching the 16-bit length of the error detection data, and the scrambling operation being performed on only 16 bits of the error detection data based on 16 bits of the first identifier; and

transmitting the processed packet to the intended access terminal.

41. The method of claim 40, wherein the step of processing further includes a coding operation after the scrambling operation.

42. The method of claim 40, wherein the error detection data comprises a checksum derived from the payload data.

43. The method of claim 40, wherein the first identifier comprises a media access controller identifier (MAC-ID) of the intended access terminal.

44. The method of claim 40, wherein the first identifier comprises a broadcast media access controller identifier (MAC-ID).

45. The method of claim 40, wherein the payload data comprises control information.

46. The method of claim 40, wherein the error detection data is scrambled based on at least one of a linear operation, an addition operation, a subtraction operation, a shift-register based operation, or a mapping operation.

47. The method of claim 40, wherein the error detection data is scrambled by adding or subtracting the first identifier to or from the error detection data.

48. An apparatus for transmitting information to an access terminal over a wireless link, comprising:

a media access control (MAC) circuit configured to obtain a packet comprising payload data and error detection data and to scramble only the error detection data based on a Media Access Controller Identifier (MAC-ID), the error detection data having a 16-bit length, the MAC-ID having a 16-bit length matching the 16-bit length of the error detection data, and the scrambling operation being performed on only 16 bits of the error detection data based on 16 bits of the MAC-ID; and

transmission circuitry for transmitting the scrambled packet.

49. The apparatus of claim 48, wherein the media access control (MAC) circuit is configured to perform a coding operation on the packet after the scrambling operation.

50. The apparatus of claim 48, wherein the payload data comprises control information.

51. The apparatus of claim 48, wherein the error detection data comprises a checksum derived from the payload data.

52. The apparatus of claim 48, wherein the MAC-ID is a unicast MAC-ID for an access terminal or a broadcast MAC-ID.

53. The apparatus of claim 48, wherein the MAC circuit is configured to scramble the error detection data based on at least one of a linear operation, an addition operation, a subtraction operation, a shift-register based operation, or a mapping operation.

54. The apparatus of claim 48, wherein the media access control (MAC) circuit is configured to scramble the error detection data by adding or subtracting the MAC-ID to or from the error detection data.