Channel communication device and method for CDMA communication system

• US 6,724,740 B1
• Filed: 08/11/1998
• Issued: 04/20/2004
• Est. Priority Date: 03/31/1998
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yoon, Soon-Young, Choi, Jin-Woo, Kim, Young-Ky, Ahn, Jae-Min, Jeong, Joong-Ho
• Primary Examiner(s): MARCELO, MELVIN C
• Application Number:
  US09/132,404
• Time in Patent Office: 2,079 Days
• Field of Search: 370/335, 370/342, 370/441
• US Class Current: 370/335
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 7/264 for data rate control
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A CDMA communication system transmitting/receiving control information during a voice and/or data communication service by using a dedicated control channel. A message frame length for the control information is variable according to an amount of the control information. The CDMA communication system includes a base station device and a terminal device. The base station device has a forward pilot channel generator for generating a pilot signal, a forward dedicated control channel generator for generating a control message for a forward dedicated control channel, a forward fundamental channel generator for generating a voice signal, and a forward supplemental channel generator for generating packet data. The terminal device has a terminal device including, a reverse dedicated control channel generator for generating a control message for a reverse dedicated control channel, a reverse pilot channel generator for generating a pilot signal by adding a power control signal to the pilot signal, a reverse fundamental channel generator for generating a voice signal, and a reverse supplemental channel generator for generating packet data.

Claims

1. A base station communication device for a CDMA (Code Division Multiple Access) communication system, comprising:

a controller for allocating an orthogonal code for channelizing one or more channels of said communication system;

a pilot channel generator for orthogonal-spreading a pilot signal with an orthogonal code allocated to a pilot channel;

a dedicated control channel generator for orthogonal-spreading a control message of a dedicated control channel with an orthogonal code allocated to the dedicated control channel and generating the control message discontinuously according to the existence/nonexistence of the control message, the dedicated control channel having a first and a second dedicated control channel signal;

a dedicated fundamental channel generator for orthogonal-spreading a voice signal of a dedicated fundamental channel with an orthogonal code allocated to the dedicated fundamental channel, the dedicated fundamental channel having a first and a second dedicated fundamental channel signal;

a dedicated supplemental channel generator for orthogonal-spreading packet data of a dedicated supplemental channel with an orthogonal code allocated to the dedicated supplemental channel, the dedicated supplemental channel having a first and a second dedicated supplemental channel signal;

a first adder for adding the output of the pilot channel generator to the first channel signals output from the dedicated control channel generator, the dedicated fundamental channel generator, and the dedicated supplemental channel generator;

a second adder for adding the second channel signals output from the dedicated control channel generator, the dedicated fundamental channel generator, and the dedicated supplemental channel generator; and

a spreader for spreading signals output from the first adder and the second adder with a PN (pseudo noise) sequence of a base station.

2. The base station communication device as claimed in claim 1, wherein said controller allocates a quasi-orthogonal code to at least one of said channel generators.

3. The base station communication device as claimed in claim 2, wherein the channel generator to which said quasi-orthogonal code is allocated is said dedicated control channel generator.

4. The base station communication device as claimed in claim 1, wherein the control message generated from said dedicated control channel generator comprises a radio link protocol (RLP).

5. The base station communication device as claimed in claim 1, wherein the control message generated from said dedicated control channel generator comprises a MAC (Medium Access Control) message.

6. The base station communication device as claimed in claim 1, wherein the control message generated from said dedicated control channel generator comprises an L3 signaling message.

7. The base station communication device as claimed in claim 1, wherein said dedicated control channel generator adds power control information to said control message.

8. The base station communication device as claimed in claim 1, wherein said fundamental channel generator adds power control information to said voice signal.

9. The base station communication device as claimed in claim 1, wherein said fundamental channel generator adds power control information to said voice signal and said dedicated control channel generator adds said power control information to said control message when said fundamental channel generator is disabled.

10. The base station communication device as claimed in claim 1, wherein said dedicated control channel generator generates said control message in first and second frame sizes according to sizes of said control message.

11. The base station communication device as claimed in claim 10, wherein said first frame size is 5 ms and said second frame size is 20 ms.

12. The base station communication device as claimed in claim 11, wherein said dedicated control channel generator generates said control message discontinuously according to existence/nonexistence of said control message.

13. The base station communication device as claimed in claim 1, wherein said dedicated control channel generator generates said control message in a first frame size when said control message is an urgent control message and in a second frame size when said control message is a normal control message.

14. The base station communication device as claimed in claim 13, wherein said first frame size is 5 ms and said second frame size is 20 ms.

15. The base station communication device as claimed in claim 14, wherein said dedicated control channel generator generates said control message discontinuously according to existence/nonexistence of said control message.

16. The base station communication device as claimed in claim 1, wherein said supplemental channel generator allocates a plurality of supplemental channels.

17. The base station communication device as claimed in claim 1, further comprising:

a sync channel generator to which an orthogonal code is allocated by said controller, for generating sync channel information for time synchronization and frame synchronization; and

a paging channel generator to which an orthogonal code is allocated by said controller, for generating information required before formation of a communication channel.

18. A terminal communication device for a CDMA communication system, comprising:

a dedicated control channel generator for discontinuously generating a control message according to the existence/nonexistence of the control message for a dedicated control channel;

a pilot channel generator for generating a pilot signal by adding a power control signal to said pilot signal thereby eliminating the need to assign a new channel to transmit the power control signal;

a fundamental channel generator for generating a voice signal;

a supplemental channel generator for generating data; and

a spreader for spreading signals output from the channel generators with a PN.

19. The terminal communication device as claimed in claim 18, further comprising a controller for allocating an orthogonal code for dividing channels of said channel generators.

20. The terminal communication device as claimed in claim 19, wherein said controller allocates a quasi-orthogonal code to at least one of said channel generators.

21. The terminal communication device as claimed in claim 20, wherein the channel generator to which said quasi-orthogonal code is allocated is said dedicated control channel generator.

22. The terminal communication device as claimed in claim 19, wherein the control message generated from said dedicated control channel generator comprises an RLP message.

23. The terminal communication device as claimed in claim 19, wherein the control message generated from said dedicated control channel generator comprises a MAC message.

24. The terminal communication device as claimed in claim 19, wherein the control message generated from said dedicated control channel generator comprises an L3 signaling message.

25. The terminal communication device as claimed in claim 19, wherein said dedicated control channel generator generates said control message in first and second frame sizes according to sizes of said control message.

26. The terminal communication device as claimed in claim 25, wherein said first frame size is 5 ms and said second frame size is 20 ms.

27. The terminal communication device as claimed in claim 26, wherein said dedicated control channel generator generates said control message discontinuously according to existence/nonexistence of said control message.

28. The terminal communication device as claimed in claim 19, wherein said dedicated control channel generator generates said control message in a first frame size when said control message is an urgent control message and in a second frame size when said control message is a normal control message.

29. The terminal communication device as claimed in claim 28, wherein said first frame size is 5 ms and said second frame size is 20 ms.

30. The terminal communication device as claimed in claim 29, wherein said dedicated control channel generator generates said control message discontinuously according to existence/nonexistence of said control message.

31. The terminal communication device as claimed in claim 19, wherein said supplemental channel generator allocates a plurality of supplemental channels.

32. The terminal communication device as claimed in claim 19, wherein said dedicated control channel generator generates said control message at a data rate of 9.6 Kbps.

33. The terminal communication device as claimed in claim 32, wherein the control message generated from said dedicated control channel generator comprises an RLP message.

34. The terminal communication device as claimed in claim 32, wherein the control message generated from said dedicated control channel generator comprises a MAC message.

35. The terminal communication device as claimed in claim 32, wherein the control message generated from said dedicated control channel generator comprises an L3 signaling message.

36. A terminal communication device for a CDMA communication system, comprising:

a dedicated control channel generator for discontinuously generating a control message for a dedicated control channel, said control message having a frame length variable according to a control type and a data rate of 9.6 Kbps;

a pilot channel generator for generating a pilot signal by adding a power control signal to said pilot signal thereby eliminating the need to assign a new channel to transmit the power control signal;

a fundamental channel generator for generating a voice signal at a variable rate;

a supplemental channel generator for generating data at a scheduled rate; and

a spreader for spreading signals output from the channel generators with a PN (pseudo noise) sequence.

37. The terminal communication device as claimed in claim 36, further comprising a controller for allocating an orthogonal code for dividing channels of said channel generators.

38. The terminal communication device as claimed in claim 37, wherein said dedicated control channel generator generates said control message in first and second frame lengths according to sizes of said control message.

39. The terminal communication device as claimed in claim 38, wherein said control message comprises RLP, MAC and L3 signaling messages.

40. The terminal communication device as claimed in claim 39, wherein the scheduled rate of said supplemental channel generator is over 9.6 Kbps.

41. The terminal communication device as claimed in claim 40, wherein the variable rate of said fundamental channel generator is a selected one of 9.6 Kbps, 4.8 Kbps, 2.4 Kbps and 1.2 Kbps.

42. A terminal communication device for a CDMA communication system, comprising:

a dedicated control channel generator for discontinuously generating a control message for a dedicated control channel and spreading said control message with an orthogonal code for an allocated dedicated control channel to generate a dedicated control channel signal, said control message having a frame length variable according to a control type and having a data rate of 9.6 Kbps;

a pilot channel generator for spreading a pilot signal and a power control signal added to said pilot signal by using an orthogonal code allocated for a pilot channel to generate a pilot channel signal thereby eliminating the need to assign a new channel to transmit the power control signal;

a fundamental channel generator for spreading a voice signal with an orthogonal code allocated for a fundamental channel to generate a fundamental channel signal;

a supplemental channel generator for spreading data with an orthogonal code allocated for a supplemental channel to generate a supplemental channel signal;

an adder for generating a first channel signal by adding said dedicated control channel signal to said pilot channel signal, and generating a second channel signal by adding said fundamental channel signal to said supplemental channel signal; and

a spreader for spreading said first and second channel signals with corresponding common PN sequences for a base station.

43. The terminal communication device as claimed in claim 42, wherein said dedicated control channel generator generates said control message in first and second frame lengths according to a message type.

44. The terminal communication device as claimed in claim 43, wherein the control message of said dedicated control channel generator comprises RLP, MAC and L3 signal messages.

45. The terminal communication device as claimed in claim 44, wherein said supplemental channel generator generates said packet data at a scheduled rate of over 9.6 Kbps according to a decision by the base station.

46. The terminal communication device as claimed in claim 45, wherein said fundamental channel generator generates a voice signal having a data rate selected form variable rates of 9.6 Kbps, 4.8 Kbps, 2.4 Kbps and 1.2 Kbps.

47. A method for communicating dedicated channel information in a base station for a CDMA communication system, comprising the steps of:

allocating a dedicated fundamental channel for communicating the dedicated channel information and a dedicated control channel for communicating control information;

transmitting information via the dedicated fundamental channel and the control information via a dedicated control channel; and

upon termination of communication, releasing the dedicated fundamental channel and the dedicated control channel;

wherein the channel communicating the control information maintains a control hold status for a predetermined time before being released.

48. The method as claimed in claim 47, wherein the information transmitted via the dedicated fundamental channel includes voice or data.

49. The method as claimed in claim 48, wherein the control information transmitted via the dedicated control channel includes one of a control message having a first frame length, and a control message and a user message having a second frame length.

50. The method as claimed in claim 49, wherein the first frame length is 5 ms and the second frame length is 20 ms.

51. The method as claimed in claim 48, wherein the dedicated control channel transmits power control bits for controlling a transmission power of a reverse link.

52. A method for communicating data in a base station for a CDMA communication system, comprising the steps of:

a) allocating a dedicated supplemental channel for communicating the data and a dedicated control channel for communicating control information;

b) transmitting the data via the dedicated supplemental channel and the control information via the dedicated control channel; and

c) upon termination of communication, releasing the dedicated channels;

wherein the channel communicating the control information maintains a control hold status for a predetermined time before being released.

53. The method as claimed in claim 52, wherein the step of releasing comprises the steps of:

i) releasing the dedicated fundamental channel; and

ii) transitioning to a control hold state to hold a connection state of the dedicated control channel.

54. The method as claimed in claim 53, wherein the step of transitioning comprises the steps of:

allocating the dedicated fundamental channel to restart communication when data communication is requested within a predefined time; and

releasing the dedicated control channel when data communication is not requested within the predefined time.

55. The method as claimed in claim 52, wherein the control information transmitted via the dedicated control channel includes one of a control message having a first frame length, and a control message and a user message having a second frame length.

56. The method as claimed in claim 55, wherein the first frame length is 5 ms and the second frame length is 20 ms.

57. The method as claimed in claim 52, wherein the dedicated control channel transmits power control bits for controlling a transmission power of a reverse link.

58. A method for communicating dedicated channel information in a base station for a CDMA communication system, comprising the steps of:

a) allocating a dedicated fundamental channel for communicating voice, a dedicated supplemental channel for communicating data and a dedicated control channel for communicating control information;

b) transmitting the voice via the dedicated fundamental channel, the data via the dedicated supplemental channel and the control information via the dedicated control channel;

c) upon termination of voice communication, releasing the dedicated fundamental channel; and

d) upon termination of data communication, releasing the dedicated supplemental channel;

wherein the channel communicating the control information maintains a control hold status for a predetermined time before being released.

59. The method as claimed in claim 58, wherein the step of releasing the dedicated supplemental channel comprises the steps of:

i) releasing the dedicated supplemental channel; and

ii) transitioning to a control hold state to hold a connection state of the dedicated control channel.

60. The method as claimed in claim 58, wherein the step of releasing the dedicated supplemental channel comprises the steps of:

releasing the dedicated supplemental channel and the dedicated control channel;

holding a connection state of the dedicated fundamental channel; and

communicating the voice and the control information via the dedicated fundamental channel.

61. The method as claimed in claim 60, wherein when the dedicated control channel is released, power control information for controlling a transmission power of a reverse link is transmitted via the dedicated fundamental channel.

62. The method as claimed in claim 58, wherein the step of releasing the dedicated supplemental channel comprises the steps of:

releasing the dedicated supplemental channel; and

holding a connection state of the dedicated fundamental channel and the dedicated control channel.

63. The method as claimed in claim 59, wherein the step of releasing the dedicated fundamental channel comprises the steps of:

i) releasing the dedicated control channel; and

ii) transitioning to a control hold state to hold a connection state of the dedicated control channel.

64. The method as claimed in claim 60, wherein the step of releasing the dedicated fundamental channel comprises the steps of:

i) releasing the dedicated control channel; and

ii) transitioning to a control hold state to hold a connection state of the dedicated control channel.

65. The method as claimed in claim 62, wherein the step of releasing the dedicated fundamental channel comprises the steps of:

i) releasing the dedicated control channel; and

ii) transitioning to a control hold state to hold a connection state of the dedicated control channel.

66. The method as claimed in claim 63, wherein the step of transitioning comprises the steps of:

allocating the dedicated supplemental channel to restart the communication when data communication is requested within a predefined time; and

releasing the dedicated control channel when data communication is not requested within the predefined time.

67. The method as claimed in claim 64, wherein the step of transitioning comprises the steps of:

allocating the dedicated supplemental channel to restart the communication when data communication is requested within a predefined time; and

releasing the dedicated control channel when data communication is not requested within the predefined time.

68. The method as claimed in claim 65, wherein the step of transitioning comprises the steps of:

allocating the dedicated supplemental channel to restart the communication when data communication is requested within a predefined time; and

releasing the dedicated control channel when data communication is not requested within the predefined time.

69. The method as claimed in claim 58, wherein the control information transmitted via the dedicated control channel includes one of a control message having a first frame length, and a control message and a user message having a second frame length.

70. The method as claimed in claim 69, wherein the first frame length is 5 ms and the second frame length is 20 ms.

71. The method as claimed in claim 58, wherein the dedicated control channel transmits power control bits for controlling a transmission power of a reverse link.