Method for communicating information in a communication system that supports multiple modulation schemes

• US 6,456,627 B1
• Filed: 08/29/1997
• Issued: 09/24/2002
• Est. Priority Date: 08/29/1997
• Status: Expired due to Term

• Current Assignee: Blackberry Limited
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Skold, Johan, Schramm, Peter, Muller, Frank, Frodigh, Carl Magnus, H{umlaut over (oo)}k, Mikael
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): KWOH, JASPER C
• Application Number:
  US08/921,376
• Time in Patent Office: 1,852 Days
• Field of Search: 370/204, 370/206, 370/331-333, 370/465, 375/259, 375/261, 375/279, 375/281, 375/340
• US Class Current: 370/465
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence

Abstract

A method of communicating control information in systems that support multiple modulation schemes for communicating voice or data and control information. To provide backward compatibility dedicated control channels use the modulation scheme used in current systems, for example GMSK modulation scheme. Traffic channels and associated control channels use linear modulation schemes that have the same symbol rate. The modulation scheme of the associated control channel uses a reduced signal set of the modulation scheme used for traffic channels. Also, an in-band signalling procedure is used to indicate to a receiving station the modulation type, channel coding and speech coding used for a transmitted burst.

Claims

1. A method of communication between a base station and a mobile station comprising the steps of:

communicating control information over a non-associated control channel;

communicating voice or data over a traffic channel;

using a first modulation scheme to communicate the control information over the non-associated control channel; and

using a second modulation scheme to communicate the voice and data over the traffic channel, wherein the traffic channel has an associated control channel that uses a third modulation scheme for communicating associated control information.

2. The method of claim 1, wherein the first modulation scheme is a non-linear modulation scheme and the second and third modulation schemes are linear modulation schemes.

3. The method of claim 2, wherein the second and the third modulation schemes have the same symbol rate.

4. The method of claim 3, wherein the associated control channel is a fast associated control channel.

5. The method of claim 3, wherein the associated control channel is a slow associated control channel.

6. The method of claim 2, wherein the third modulation scheme has a lower level of modulation than the second modulation scheme.

7. The method of claim 6, wherein the third modulation scheme uses a reduced signal set of the second modulation scheme.

8. The method of claim 2, wherein the second and third modulation schemes use the same pulse shaping.

9. The method of claim 2, wherein the second and third modulation schemes use the same burst format.

10. The method in claim 2, wherein the second and third modulation schemes use the same training sequences.

11. The method in claim 2, wherein the first modulation scheme is GMSK modulation scheme, the second modulation scheme is a QAM modulation scheme, and the third modulation scheme is a QPSK modulation scheme.

12. A method of communication between a base station and a mobile station comprising:

communicating control information over a non-associated control channel using a first modulation scheme;

communicating voice or data over a traffic channel using a second modulation scheme; and

communicating in-band signalling information over the traffic channel using a third modulation scheme, wherein the in-band signalling information includes reserved bits indicating at least one or more of a modulation type, a channel coding, or a speech coding used with a transmitted burst.

13. The method of claim 12, wherein the second and the third modulation schemes have the same symbol rate.

14. The method of claim 13, wherein the reserved bits have a predetermined position within the transmitted burst.

15. The method of claim 13, wherein the traffic channel has an associated control channel that uses the third modulation scheme for communicating control information.

16. The method of claim 13, wherein both the second and third modulation schemes are linear modulation schemes.

17. The method of claim 16, wherein the second modulation scheme has a higher level of modulation than the third modulation scheme.

18. The method of claim 17, wherein the third modulation scheme uses a reduced signal set of the second modulation scheme.

19. The method of claim 16, wherein the second and third modulation schemes have the same level of modulation.

20. The method of claim 16, wherein the second modulation scheme and the third modulation scheme use the same pulse shaping.

21. The method of claim 16, wherein the second and third modulation schemes use the same burst format.

22. The method in claim 16, wherein the second and third modulation schemes use the same training sequences.

23. The method in claim 16, wherein the first modulation scheme is a GMSK scheme, the second modulation scheme is a QAM modulation scheme and the third modulation scheme is a QPSK modulation scheme.

24. A method of communication between a mobile station and a base station comprising:

communicating control information over a non-associated control channel using a first modulation scheme;

communicating voice or data over a traffic channel using a second modulation scheme; and

initiating a hand-over via an associated control channel using a third modulation scheme.

25. The method of claim 24, wherein the second and the third modulation schemes have the same symbol rate.

26. The method of claim 25, wherein the associated control channel is a fast associated control channel.

27. The method of claim 26, wherein the fast associated control channel is indicated by signalling information that are communicated using the third modulation scheme.

28. The method of claim 25, wherein both the second and third modulation schemes are linear modulation schemes.

29. The method of claim 28, wherein the second modulation scheme has a higher level of modulation than the third modulation scheme.

30. The method of claim 29, wherein the third modulation scheme uses a reduced signal set relative to the second modulation scheme.

31. The method of claim 28, wherein the second and third modulation schemes have the same level.

32. The method of claim 28, wherein the second modulation scheme and the third modulation scheme use the same pulse shaping.

33. The method of claim 28, wherein the second and third modulation schemes use the same burst format.

34. The method in claim 28, wherein the second and third modulation schemes use the same training sequences.

35. The method in claim 28, wherein the first modulation scheme is a GMSK modulation scheme, the second modulation scheme is a QAM modulation scheme and that the third modulation scheme is a QPSK modulation scheme.

36. A method of communication between a base station and a mobile station, comprising the steps of:

transmitting a burst that communicates three sets of information;

modulating a first set of information using a first modulation scheme, wherein the first set of information is control information;

modulating a second set of information using a second modulation scheme that is different from the first modulation scheme, wherein the second set of information is voice and data; and

modulating a third set of information using a third modulation scheme that is different from the first and the second modulation schemes, wherein the third set of information is other control information.

37. The method of claim 36, wherein the first modulation scheme is a non-linear modulation scheme and the second and third modulation schemes are linear modulation schemes.

38. The method of claim 36, wherein the second and third modulation schemes have the same symbol rate.

39. The method of claim 37, wherein the second modulation scheme has a higher level of modulation than the third modulation scheme.

40. The method of claim 39, wherein the third modulation scheme uses a reduced signal set of the second modulation scheme to communicate the second set of information.

41. The method of claim 37, wherein the second modulation scheme and the third modulation scheme use the same pulse shaping.

42. The method of claim 37, wherein the second and third modulation schemes use the same burst format.

43. The method in claim 37, wherein the first modulation scheme is a GMSK modulation scheme, the second modulation scheme is a QAM modulation scheme, and the third modulation scheme is a QPSK modulation scheme.

44. The method of claim 36, wherein the control information is control information transmitted over control channels that are not associated with traffic channels, and wherein the other control information is control information transmitted over control channels that are associated with traffic channels.