Claims
- 1. A format for a code division multiple access downlink synchronization code transmission, comprising:
- a repeating frame comprising a plurality of slots;
- a primary synchronization code c.sub.p repeated in each slot of the repeating frame; and
- a secondary synchronization combined code c.sub.s/lci providing information useful in a process for identifying both a frame timing and a scrambling code for the downlink transmission.
- 2. The format of claim 1 wherein the information relating to the scrambling code is conveyed by the combined code c.sub.s/lci itself.
- 3. The format of claim 1 wherein the information relating to the frame timing is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c.sub.s/lci within the frame.
- 4. The format of claim 3 wherein modulation implemented by the modulation sequence on the plural combined codes c.sub.s/lci within the frame comprises binary phase shift keyed (BPSK) modulation.
- 5. The format of claim 3 wherein modulation implemented by the modulation sequence on the plural combined codes c.sub.s/lci within the frame comprises quadrature phase shift keyed (QPSK) modulation.
- 6. The format of claim 1 wherein the information relating to the frame timing and scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c.sub.s/lci within the frame.
- 7. The format of claim 6 wherein the modulation sequence comprises a first portion and a second portion, and wherein a pattern of the modulation defined by the first portion of the modulation sequence provides the information relating to the frame timing, and a pattern of the modulation defined by the second portion of the modulation sequence provides the information relating to the scrambling code.
- 8. The format of claim 6 wherein a pattern of the modulation defined by the modulation sequence explicitly provides the information relating to the scrambling code and implicitly provides the information relating to the frame timing.
- 9. The format of claim 1 wherein a part of the information relating to the scrambling code is conveyed by the combined code c.sub.s/lci itself.
- 10. The format of claim 9 wherein the information relating to the frame timing and scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c.sub.s/lci within the frame.
- 11. The format of claim 10 wherein a pattern of the modulation defined by the modulation sequence explicitly provides another part of the information relating to the scrambling code and implicitly provides the information relating to the frame timing.
- 12. The format of claim 1 wherein at least part of the information relating to the scrambling code is conveyed by a sequence of the combined codes c.sub.s/lci included within the frame, the sequence further implicitly providing the information relating to the frame timing.
- 13. The format of claim 12 wherein further information relating to the scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c.sub.s/lci within the frame.
- 14. The format of claim 13 wherein a pattern of the modulation defined by the modulation sequence explicitly provides another part of the information relating to the scrambling code.
- 15. The format of claim 1 wherein each combined code c.sub.s/lci is offset from its associated primary code c.sub.p in a slot by a distance specified by a pattern of distances in a distance sequence, and wherein the pattern of distances defined by the distance sequence provides the information useful in identifying frame timing and/or scrambling code.
- 16. The format of claim 15 wherein the distance sequence comprises a first portion and a second portion, and wherein a pattern of the distances defined by the first portion of the distance sequence provides the information relating to the frame timing, and a pattern of the distances defined by the second portion of the distance sequence provides the information relating to the scrambling code.
- 17. The format of claim 15 wherein the pattern of distances defined by the distance sequence provides the information useful in identifying frame timing, and wherein the information relating to the scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c.sub.s/lci within the frame.
- 18. The format of claim 15 wherein the pattern of distances defined by the distance sequence provides the information useful in identifying scrambling code, and wherein the information relating to the frame timing is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c.sub.s/lci within the frame.
- 19. The format of claim 1 wherein the primary code c.sub.p comprises a pilot code.
- 20. The format of claim 1 wherein the scrambling code comprises a long code.
- 21. A code division multiple access communications system, comprising:
- a base station transmitter for generating a downlink synchronization code transmission, comprising:
- a repeating frame comprising a plurality of slots;
- a primary synchronization code c.sub.p repeated in each slot of the repeating frame; and
- a secondary synchronization combined code c.sub.s/lci providing information useful in a process for identifying both a frame timing and a scrambling code for the downlink transmission; and
- a mobile station for receiving the downlink synchronization code transmission and recovering the information useful for identifying both a frame timing and a scrambling code.
- 22. The system of claim 21 wherein the information relating to the scrambling code is conveyed by the combined code c.sub.s/lci itself.
- 23. The system of claim 21 wherein the information relating to the frame timing is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c.sub.s/lci within the frame.
- 24. The system of claim 23 wherein modulation implemented by the modulation sequence on the plural combined codes c.sub.s/lci within the frame comprises binary phase shift keyed (BPSK) modulation.
- 25. The system of claim 23 wherein modulation implemented by the modulation sequence on the plural combined codes c.sub.s/lci within the frame comprises quadrature phase shift keyed (QPSK) modulation.
- 26. The system of claim 21 wherein the information relating to the frame timing and scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c.sub.s/lci within the frame.
- 27. The system of claim 26 wherein the modulation sequence comprises a first portion and a second portion, and wherein a pattern of the modulation defined by the first portion of the modulation sequence provides the information relating to the frame timing, and a pattern of the modulation defined by the second portion of the modulation sequence provides the information relating to the scrambling code.
- 28. The system of claim 26 wherein a pattern of the modulation defined by the modulation sequence explicitly provides the information relating to the scrambling code and implicitly provides the information relating to the frame timing.
- 29. The system of claim 21 wherein a part of the information relating to the scrambling code is conveyed by the combined code c.sub.s/lci itself.
- 30. The system of claim 29 wherein the information relating to the frame timing and scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c.sub.s/lci within the frame.
- 31. The system of claim 30 wherein a pattern of the modulation defined by the modulation sequence explicitly provides another part of the information relating to the scrambling code and implicitly provides the information relating to the frame timing.
- 32. The system of claim 21 wherein at least part of the information relating to the scrambling code is conveyed by a sequence of the combined codes c.sub.s/lci included within the frame, the sequence further implicitly providing the information relating to the frame timing.
- 33. The system of claim 32 wherein further information relating to the scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c.sub.s/lci within the frame.
- 34. The system of claim 33 wherein a pattern of the modulation defined by the modulation sequence explicitly provides another part of the information relating to the scrambling code.
- 35. The system of claim 21 wherein each combined code c.sub.s/lci is offset from its associated primary code c.sub.p in a slot by a distance specified by a pattern of distances in a distance sequence, and wherein the pattern of distances defined by the distance sequence provides the information useful in identifying frame timing and/or scrambling code.
- 36. The system of claim 35 wherein the distance sequence comprises a first portion and a second portion, and wherein a pattern of the distances defined by the first portion of the distance sequence provides the information relating to the frame timing, and a pattern of the distances defined by the second portion of the distance sequence provides the information relating to the scrambling code.
- 37. The system of claim 35 wherein the pattern of distances defined by the distance sequence provides the information useful in identifying frame timing, and wherein the information relating to the scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c.sub.s/lci within the frame.
- 38. The system of claim 35 wherein the pattern of distances defined by the distance sequence provides the information useful in identifying scrambling code, and wherein the information relating to the frame timing is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c.sub.s/lci within the frame.
- 39. The system of claim 21 wherein the primary code c.sub.p comprises a pilot code.
- 40. The system of claim 21 wherein the scrambling code comprises a long code.
CROSS REFERENCE TO RELATED APPLICATION
The present application for patent is related to U.S. application for patent Ser. No. 08/884,002, entitled "MOBILE STATION SYNCHRONIZATION WITHIN A SPREAD SPECTRUM COMMUNICATIONS SYSTEM", filed Jun. 27, 1997.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4943974 |
Motamedi |
Jul 1990 |
|
5416797 |
Gilhousen et al. |
May 1995 |
|
5778316 |
Persson et al. |
Jul 1998 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
0 744 840 |
May 1996 |
EPX |
WO 9315573 |
Aug 1993 |
WOX |
Non-Patent Literature Citations (2)
Entry |
Baier, Alfred, et al., Design Study for a CDMA-Based Third-Generation Mobile Radio System, pp. 733-743. |
Higuchi, Kenichi, et al. Fast Cell Search Algorithm using Long Code Masking in DS-CDMA Asynchronous Cellular System, pp. 1-6 (with translation). |