ENHANCEMENTS TO THE POSITIONING PILOT CHANNEL

• US 20090190525A1
• Filed: 07/01/2008
• Published: 07/30/2009
• Est. Priority Date: 01/28/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Mukkavilli, Krishna Kiran, Mantravadi, Ashok
• Granted Patent: US 8,165,064 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

A method for communicating transmitter identification in an interlace structure of a communication network system using positioning pilot channels (PPC), comprising:

• • a) encoding pilot information on a first portion of a plurality of subcarriers in a positioning pilot channel symbol for an active transmitter; and
  • b) encoding transmitter identification information on a second portion of a plurality of subcarriers of the symbol;
  • wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace;
  • the pilot information is scrambled in the first interlace with a wide area identifier and scrambled in the at least second interlaces with the wide area identifier and a local area identifier; and
  • wherein at least one of the interlace includes the transmitter identification information in the form of one or more transmitter location coordinates in a free interlace.

Claims

1. A method for communicating transmitter identification in an interlace structure of a communication network system using positioning pilot channels (PPC), comprising:

a) encoding pilot information on a first portion of a plurality of subcarriers in a positioning pilot channel symbol for an active transmitter; and

b) encoding transmitter identification information on a second portion of a plurality of subcarriers of the symbol;

wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace;

said pilot information is scrambled in the first interlace with a wide area identifier and scrambled in the at least second interlaces with the wide area identifier and a local area identifier; and

wherein at least one of said interlace includes said transmitter identification information in the form of one or more transmitter location coordinates in a free interlace.

2. The method of claim 1, wherein the transmitter identification information is encoded in at least the third interlace.

3. The method of claim 1, wherein said interlace structure is grouped into eight interlaces.

4. The method of claim 3, wherein said transmitter location coordinates are longitude, latitude and or altitude coordinates.

5. The method of claim 4, wherein said transmitter location coordinates of longitude, latitude and or altitude are in interlace 3.

6. The method of claim 5, wherein interlace 3 also includes network delay information.

7. The method of claim 6, wherein a fixed bit PPC packet length of 80 bits is used to provide 10 blocks of 8 bits each, with each 8 bits converted to 100 bits.

8. The method of claim 7, wherein said 80 bit PPC packet is allocated as option:

Field #bits Packet Type 2 TxID or Other Parameters Latitude 23 0.125 second resolution Longitude 24 0.125 second resolution Altitude 10 4 m resolution Network Delay 11 In micro-seconds Allocation 3 CRC 7

9. The method of claim 7, wherein said 80 bit PPC packet is allocated as option:

Field #bits Packet Type 2 TxID or Other Parameters Transmitter ID 18 Reserved 50 Additional bits to match packet size Allocation 3 CRC 7

10. The method of claim 8, wherein said packet type further includes parameters of transmitter power and super-frame number.

11. The method of claim 9, wherein said packet type further includes parameters of transmitter power and super-frame number.

12. The method as defined in claim 1, wherein the encoding of transmitter identification information includes:

interleaving information bits of the transmitter identification information;

encoding the bits using a predetermined encoding scheme;

manipulating the encoded bits to ensure number of bits matches a predetermined modulation scheme;

modulating the bits according to the predetermined modulation scheme; and

mapping the modulated bits to subcarriers in the second portion of the plurality of subcarriers of the symbol.

13. The method of claim 12, wherein the predetermined encoding scheme comprises Reed-Muller encoding.

14. The method of claim 12, wherein manipulating the encoded bits includes puncturing one or more encoded bits and replacing the punctured encoded bits with zero values.

15. The method of claim 12, wherein the predetermined modulated scheme comprises QPSK modulation.

16. The method of claim 1, wherein the communication system comprises an OFDM communication system.

17. An apparatus for communicating transmitter identification in an interlace structure of a communication network system using positioning pilot channels (PPC) comprising:

a) a first module configured to encode pilot information on a first portion of a plurality of subcarriers in a positioning pilot channel symbol for an active transmitter; and

b) a second module configured to encode transmitter identification information on a second portion of a plurality of subcarriers of the symbol;

wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace;

said pilot information is scrambled in the first interlace with a wide area identifier and scrambled in the at least second interlaces with the wide area identifier and a local area identifier; and

wherein at least one of said interlace includes said transmitter identification information in the form of one or more transmitter location coordinates in a free interlace.

18. The apparatus of claim 17, wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace.

19. The apparatus of claim 17, wherein said interlace structure is grouped into eight interlaces.

20. The apparatus of claim 17, wherein said transmitter location coordinates of longitude, latitude and or altitude are in interlace 3.

21. The apparatus of claim 20, wherein interlace 3 also includes network delay information.

22. The apparatus of claim 21, wherein a fixed bit PPC packet length of 80 bits is included to provide 10 blocks of 8 bits each, with each 8 bits converted to 100 bits.

23. The apparatus of claim 22, wherein said 80 bit PPC packet is allocated as option:

Field #bits Packet Type 2 TxID or Other Parameters Latitude 23 0.125 second resolution Longitude 24 0.125 second resolution Altitude 10 4 m resolution Network Delay 11 In micro-seconds Allocation 3 CRC 7

24. The apparatus of claim 22, wherein said 80 bit PPC packet is allocated as option:

Field #bits Packet Type 2 TxID or Other Parameters Transmitter ID 18 Reserved 50 Additional bits to match packet size Allocation 3 CRC 7

25. A computer program product, comprising:

a computer-readable medium comprising;

code for causing a computer to encode pilot information on a first portion of a plurality of subcarriers in a positioning pilot channel symbol for an active transmitter; and

code for causing a computer to encode transmitter identification information on a second portion of a plurality of subcarriers of the symbol;

wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace;

said pilot information comprises code for causing a computer to scramble in the first interlace with a wide area identifier and code for causing a computer scrambling in the at least second interlaces with the wide area identifier and a local area identifier; and

wherein at least one of said interlace includes code for causing a computer to encode said transmitter identification information in the form of one or more transmitter location coordinates in a free interlace.

26. The computer program product of claim 25, wherein the transmitter identification information is encoded in at least the third interlace.

27. The computer program product of claim 25, wherein the transmitter identification information includes at least one of a transmitter identification field, a transmitter allocation field, and cyclic redundancy check bits.

28. The computer product of claim 27, wherein the transmitter allocation field is configured to communicate whether subsequent symbols including further data will be transmitted.

29. The computer program product of claim 25, wherein the computer readable medium further comprises code for causing a computer to transmit transmitter allocation data within the transmitter identification information indicating the allocation of one or more subsequent symbols for a transmitter specific channel used to communicate further data.

30. The computer program product of claim 25, wherein the computer readable medium further comprises:

code for interleaving information bits of the transmitter identification information;

code for encoding the bits using a predetermined encoding scheme;

code for manipulating the encoded bits to ensure number of bits matches a predetermined modulation scheme;

code for modulating the bits according to the predetermined modulation scheme; and

code for mapping the modulating bits to subcarriers in the second portion of the plurality of subcarriers of the symbol.

31. The computer program product of claim 30, wherein the predetermined encoding scheme comprises Reed-Muller encoding.

32. The computer program product of claim 30, wherein the code for manipulating the encoded bits further includes code for puncturing one or more encoded bits and replacing the punctured encoding bits with zero values.

33. The computer program product of claim 30, wherein the predetermined modulation scheme comprises QPSK modulation.

34. The computer product of claim 25, wherein the communication system comprises an OFDM communication system.

35. A computer readable media embodying a method for communicating transmitter identification in an interlace structure of a communication network system using positioning pilot channels (PPC), the method comprising:

a) encoding pilot information on a first portion of a plurality of subcarriers in a positioning pilot channel symbol for an active transmitter; and

b) encoding transmitter identification information on a second portion of a plurality of subcarriers of the symbol;

wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace;

said pilot information is scrambled in the first interlace with a wide area identifier and scrambled in the at least second interlaces with the wide area identifier and a local area identifier; and

wherein at least one of said interlace includes said transmitter identification information in the form of one or more transmitter location coordinates in a free interlace.

36. The computer readable media of claim 35, wherein the transmitter identification information is encoded in at least the third interlace.

37. The computer readable media of claim 35, wherein said interlace structure is grouped into eight interlaces.

38. The computer readable media of claim 37, wherein said transmitter location coordinates are longitude, latitude and or altitude coordinates.

39. The computer readable media of claim 38, wherein said transmitter location coordinates of longitude, latitude and or altitude are in interlace 3.

40. The computer readable media of claim 39, wherein interlace 3 also includes network delay information.

41. The computer readable media of claim 40, wherein a fixed bit PPC packet length of 80 bits is used to provide 10 blocks of 8 bits each, with each 8 bits converted to 100 bits.

42. The computer readable media of claim 41, wherein said 80 bit PPC packet is allocated as option:

43. The computer readable media of claim 41, wherein said 80 bit PPC packet is allocated as option:

Field #bits Packet Type 2 TxID or Other Parameters Transmitter ID 18 Reserved 50 Additional bits to match packet size Allocation 3 CRC 7