RACH ramp-up acknowledgement

• US 7,508,861 B2
• Filed: 10/31/2007
• Issued: 03/24/2009
• Est. Priority Date: 03/22/1999
• Status: Expired due to Fees

• Current Assignee: Apple Inc.
• Original Assignee: Golden Bridge Technology Incorporated
• Inventors: Parsa, Kourosh, Kanterakis, Emmanuel
• Primary Examiner(s): Bocure, Tesfaldet
• Application Number:
  US11/979,117
• Publication Number:
  US 20080062951A1
• Time in Patent Office: 510 Days
• Field of Search: None
• US Class Current: 375/141
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70702 Intercell-related aspects
• CPC Class Codes: H04B 7/2668 Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation, for code acquisition H04B1/7075, for code tracking H04B1/7085
• CPC Class Codes: H04J 11/0069 Cell search, i.e. determining cell identity [cell-ID] design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 74/00 Wireless channel access

Abstract

A disclosed code-division-multiple-access (CDMA) system has a base station (BS) and remote stations (RSs). A BS-spread-spectrum transmitter broadcasts a common-synchronization channel having a chip-sequence signal common to the remote stations served by the BS, and a frame-timing signal. A RS-spread-spectrum receiver receives the broadcast common-synchronization channel, and determines frame timing from the frame-timing signal. A first RS-spread-spectrum transmitter transmits an access-burst signal, which has a plurality of segments. Each access burst signal segment has a plurality of power levels. A BS-spread-spectrum receiver receives the access-burst signal at a detected-power level. In response to receiving the access-burst signal, a BS-spread-spectrum transmitter transmits an acknowledgment signal to the RS-spread-spectrum receiver. The RS-spread-spectrum receiver receives the acknowledgment signal, and in the RS-spread-spectrum transmitter transmits a spread-spectrum signal having data to the BS-spread-spectrum receiver.

Claims

1. A method of wireless transmission of packet data from a remote station in a communication network having a base station, the method comprising steps of:

selecting an access preamble from a set of predefined preambles;

spread-spectrum transmitting an access burst segment consisting of the selected preamble at a first discrete power level followed by a pilot, without any data of a message;

during transmitting of the pilot, listening for an acknowledgement signal from the base station;

if NO acknowledgement corresponding to the access preamble is detected while listening, spread-spectrum transmitting an access burst segment consisting of an access preamble from the set of predefined preambles at a second discrete power level higher than the first discrete power level followed by a pilot, without any data of a message;

upon detecting an acknowledgement corresponding to a transmitted access preamble, ceasing access burst segment transmission; and

beginning transmission of packet data of a message, for reception by the base station, following cessation of access burst segment transmission.

2. The method of claim 1, wherein the acknowledgement is a layer one (L1) acknowledgement.

3. The method of claim 1, wherein, in each access burst segment, power level of the pilot is less than power level of the preamble.

4. The method of claim 3, wherein the power level of each pilot is zero.

5. The method of claim 3, wherein the power level of each pilot is greater than zero.

6. The method of claim 1, wherein:

the acknowledgement is a layer one (L1) acknowledgement;

power level of each pilot is zero; and

the transmitted access preambles are the same.

7. The method of claim 6, further comprising steps:

receiving from the base station a common channel broadcast from the base station; and

responsive to the received broadcast common channel, determining a transmission parameter;

wherein at least one of the access burst segment transmitting steps is implemented using the determined transmission parameter.

8. The method of claim 1, further comprising steps:

receiving from the base station a common channel broadcast from the base station; and

responsive to the received broadcast common channel, determining a transmission parameter;

wherein at least one of the access burst segment transmitting steps is implemented using the determined transmission parameter.

9. The method of claim 8, wherein the common channel broadcast received from the base station is a broadcast control channel (BCCH).

10. The method of claim 8, wherein the set of predefined preambles is a set of preambles associated with the base station.

11. The method of claim 10, wherein the transmitted access preambles are the same.

12. The method of claim 10, wherein each transmitted access preamble is different.

13. The method of claim 10, wherein the common channel broadcast received from the base station indicates the set of preambles associated with the base station.

14. A method of wireless transmission of packet data from a remote station in a communication network having a base station, the method comprising steps of:

selecting an access preamble from a set of predefined preambles;

spread-spectrum transmitting a signal consisting of the selected preamble at a first discrete power level followed by a pilot, without any data of a message, wherein power level of the pilot is less than power level of the preamble;

during transmitting of the pilot, listening for a layer one (L1) acknowledgement signal from the base station;

if NO L1 acknowledgement corresponding to the access preamble is detected while listening, spread-spectrum transmitting said access preamble at a second discrete power level higher than the first discrete power level, without any data of a message;

upon detecting a L1 acknowledgement corresponding to the transmitted access preamble, ceasing preamble transmission; and

beginning transmission of packet data of a message, for reception by the base station, following cessation of preamble transmission.

15. The method of claim 14, wherein the power level of the pilot is zero.

16. The method of claim 14, wherein the power level of the pilot is greater than zero.

17. The method of claim 14, further comprising steps:

receiving from the base station a common channel broadcast from the base station; and

responsive to the received broadcast common channel, determining a transmission parameter;

wherein at least one of the transmitting steps is implemented using the determined transmission parameter.

18. The method of claim 17, wherein the common channel broadcast received from the base station is a broadcast control channel (BCCH).

19. The method of claim 17, wherein the set of predefined preambles is a set of preambles associated with the base station.

20. The method of claim 19, wherein the common channel broadcast received from the base station indicates the set of preambles associated with the base station.

21. A method of wireless transmission of packet data from a remote station in a communication network having a base station, the method comprising steps of:

receiving from the base station a common channel broadcast from the base station, including an indication of a set of preambles associated with the base station;

responsive to the received common channel, selecting a first preamble from among preambles associated with the base station;

spread-spectrum transmitting an access burst segment consisting of the selected first preamble at a first discrete power level followed by a pilot, without any data of a message;

during transmitting of the pilot, listening for an acknowledgement signal from the base station;

if NO acknowledgement corresponding to the first preamble is detected while listening, selecting a second preamble from among preambles associated with the base station and spread-spectrum transmitting an access burst segment consisting of the second preamble at a second discrete power level higher than the first discrete power level followed by a pilot, without any data of a message;

upon detecting an acknowledgement corresponding to a transmitted preamble, ceasing access burst segment transmission; and

beginning transmission of packet data of a message, for reception by the base station, following cessation of access burst segment transmission.

22. The method of claim 21, wherein the first and second preambles are the same.

23. The method of claim 21, wherein the first and second preambles are different preambles.

24. The method of claim 21, wherein power level of each pilot is zero.

25. The method of claim 21, wherein the common channel broadcast received from the base station is a broadcast control channel (BCCH).

26. The method of claim 21, wherein the acknowledgement is a layer one (L1) acknowledgement.

27. The method of claim 21, wherein:

the acknowledgement is a layer one (L1) acknowledgement;

power level of each pilot is zero; and

the transmitted access preambles are the same.

28. A remote station for wireless transmission of packet data to a base station of a network, the remote station comprising:

a spread-spectrum transmitter;

a spread-spectrum receiver; and

a controller coupled to the receiver for responding to signals received via the receiver and coupled for controlling the transmitter, such that in operation the remote station is configured for performing functions comprising;

selecting an access preamble from a set of predefined preambles;

spread-spectrum transmitting an access burst segment consisting of the selected preamble at a first discrete power level followed by a pilot, without any data of a message;

during transmitting of the pilot, listening for an acknowledgement signal from the base station;

if NO acknowledgement corresponding to the access preamble is detected while listening, spread-spectrum transmitting an access burst segment consisting of an access preamble from the set of predefined preambles at a second discrete power level higher than the first discrete power level followed by a pilot, without any data of a message;

upon detecting an acknowledgement corresponding to a transmitted access preamble, ceasing access burst segment transmission; and

beginning transmission of packet data of a message, for reception by the base station, following cessation of access burst segment transmission.

29. The remote station of claim 28, wherein the acknowledgement is a layer one (L1) acknowledgement.

30. The remote station of claim 28, wherein, in each access burst segment, power level of the pilot is less than power level of the preamble.

31. The remote station of claim 30, wherein the power level of the pilot is zero.

32. The remote station of claim 30, wherein the power level of the pilot is greater than zero.

33. The remote station of claim 28, wherein:

the acknowledgement is a layer one (L1) acknowledgement;

power level of each pilot is zero; and

the transmitted access preambles are the same.

34. The remote station of claim 28, wherein the set of predefined preambles is a set of preambles associated with the base station.

35. The remote station of claim 34, wherein the transmitted access preambles are the same.

36. The remote station of claim 34, wherein each transmitted access preamble is different.

37. A base-band processor for use in a wireless remote station for wireless transmission of packet data to a base station of a network, the remote station having a spread-spectrum modulator and a spread-spectrum demodulator, the base-band processor comprising:

an acknowledgment detector, coupled to the demodulator, for detecting an acknowledgment in a received spread-spectrum signal;

a preamble generator for generating signals containing preambles;

a multiplexer for multiplexing the data and the preamble signals and supplying the multiplexed data and preamble signals to the modulator for transmission; and

a controller coupled to the acknowledgment detector and coupled for controlling the modulator, the preamble generator and the multiplexer, such that in operation the remote station is configured for performing functions comprising;

selecting an access preamble from a set of predefined preambles;

spread-spectrum transmitting an access burst segment consisting of the selected preamble at a first discrete power level followed by a pilot, without any data of a message;

during transmitting of the pilot, listening for an acknowledgement signal from the base station;

if NO acknowledgement corresponding to the access preamble is detected while listening, spread-spectrum transmitting an access burst segment consisting of an access preamble from the set of predefined preambles at a second discrete power level higher than the first discrete power level followed by a pilot, without any data of a message;

upon detecting an acknowledgement corresponding to a transmitted access preamble, ceasing access burst segment transmission; and

beginning transmission of packet data of a message, for reception by the base station, following cessation of access burst segment transmission.

38. The base-band processor of claim 37, wherein the acknowledgement is a layer one (L1) acknowledgement.

39. The base-band processor of claim 37, wherein, in each access burst segment, power level of the pilot is less than power level of the preamble.

40. The base-band processor of claim 39, wherein the power level of the pilot is zero.

41. The base-band processor of claim 39, wherein the power level of the pilot is greater than zero.

42. The base-band processor of claim 37, wherein:

the acknowledgement is a layer one (L1) acknowledgement;

power level of each pilot is zero; and

the transmitted access preambles are the same.

43. The base-band processor of claim 37, wherein the set of predefined preambles is a set of preambles associated with the base station.

44. The base-band processor of claim 43, wherein the transmitted access preambles are the same.

45. The base-band processor of claim 43, wherein each transmitted access preamble is different.

46. A remote station for wireless transmission of packet data to a base station of a network, the remote station comprising:

a spread-spectrum transmitter;

a spread-spectrum receiver; and

a controller coupled to the receiver for responding to signals received via the receiver and coupled for controlling the transmitter, such that in operation the remote station is configured for performing functions comprising;

selecting an access preamble from a set of predefined preambles;

spread-spectrum transmitting a signal consisting of the selected preamble at a first discrete power level followed by a pilot, without any data of a message, wherein power level of the pilot is less than power level of the preamble;

during transmitting of the pilot, listening for a layer one (L1) acknowledgement signal from the base station;

if NO L1 acknowledgement corresponding to the access preamble is detected while listening, spread-spectrum transmitting said access preamble at a second discrete power level higher than the first discrete power level, without any data of a message;

upon detecting a L1 acknowledgement corresponding to the transmitted access preamble, ceasing preamble transmission; and

beginning transmission of packet data of a message, for reception by the base station, following cessation of preamble transmission.

47. The remote station of claim 46, wherein the power level of the pilot is zero.

48. The remote station of claim 46, wherein the power level of the pilot is greater than zero.

49. The remote station of claim 46, wherein the set of predefined preambles is a set of preambles associated with the base station.

50. A base-band processor for use in a wireless remote station for wireless transmission of packet data to a base station of a network, the remote station having a spread-spectrum modulator and a spread-spectrum demodulator, the base-band processor comprising:

an acknowledgment detector, coupled to the demodulator, for detecting an acknowledgment in a received spread-spectrum signal;

a preamble generator for generating signals containing preambles;

a multiplexer for multiplexing the data and the preamble signals and supplying the multiplexed data and preamble signals to the modulator for transmission; and

a controller coupled to the acknowledgment detector and coupled for controlling the modulator, the preamble generator and the multiplexer, such that in operation the remote station is configured for performing functions comprising;

selecting an access preamble from a set of predefined preambles;

spread-spectrum transmitting a signal consisting of the selected preamble at a first discrete power level followed by a pilot, without any data of a message, wherein power level of the pilot is less than power level of the preamble;

during transmitting of the pilot, listening for a layer one (L1) acknowledgement signal from the base station;

if NO L1 acknowledgement corresponding to the access preamble is detected while listening, spread-spectrum transmitting said access preamble at a second discrete power level higher than the first discrete power level, without any data of a message;

upon detecting a L1 acknowledgement corresponding to the transmitted access preamble, ceasing preamble transmission; and

beginning transmission of packet data of a message, for reception by the base station, following cessation of preamble transmission.

51. The base-band processor of claim 50, wherein the power level of the pilot is zero.

52. The base-band processor of claim 50, wherein the power level of the pilot is greater than zero.

53. The base-band processor of claim 50, wherein the set of predefined preambles is a set of preambles associated with the base station.

54. A remote station for wireless transmission of packet data to a base station of a network, the remote station comprising:

a spread-spectrum transmitter;

a spread-spectrum receiver; and

a controller coupled to the receiver for responding to signals received via the receiver and coupled for controlling the transmitter, such that in operation the remote station is configured for performing functions comprising;

receiving from the base station a common channel broadcast from the base station, including an indication of a set of preambles associated with the base station;

responsive to the received common channel, selecting a first preamble from among preambles associated with the base station;

spread-spectrum transmitting an access burst segment consisting of the selected first preamble at a first discrete power level followed by a pilot, without any data of a message;

during transmitting of the pilot, listening for an acknowledgement signal from the base station;

if NO acknowledgement corresponding to the first preamble is detected while listening, selecting a second preamble from among preambles associated with the base station and spread-spectrum transmitting an access burst segment consisting of the second preamble at a second discrete power level higher than the first discrete power level followed by a pilot, without any data of a message;

upon detecting an acknowledgement corresponding to a transmitted preamble, ceasing access burst segment transmission; and

beginning transmission of packet data of a message, for reception by the base station, following cessation of access burst segment transmission.

55. The remote station of claim 54, wherein the first and second preambles are the same.

56. The remote station of claim 54, wherein the first and second preambles are different preambles.

57. The remote station of claim 54, wherein power level of each pilot is zero.

58. The remote station of claim 54, wherein the common channel broadcast received from the base station is a broadcast control channel (BCCH).

59. The remote station of claim 54, wherein the acknowledgement is a layer one (L1) acknowledgement.

60. The remote station of claim 54, wherein:

the acknowledgement is a layer one (L1) acknowledgement;

power level of each pilot is zero; and

the transmitted access preambles are the same.

61. A base-band processor for use in a wireless remote station for wireless transmission of packet data to a base station of a network, the remote station having a spread-spectrum modulator and a spread-spectrum demodulator, the base-band processor comprising:

an acknowledgment detector, coupled to the demodulator, for detecting an acknowledgment in a received spread-spectrum signal;

a preamble generator for generating signals containing preambles;

a multiplexer for multiplexing the data and the preamble signals and supplying the multiplexed data and preamble signals to the modulator for transmission; and

a controller coupled to the acknowledgment detector and coupled for controlling the modulator, the preamble generator and the multiplexer, such that in operation the remote station is configured for performing functions comprising;

receiving from the base station a common channel broadcast from the base station, including an indication of a set of preambles associated with the base station;

responsive to the received common channel, selecting a first preamble from among preambles associated with the base station;

spread-spectrum transmitting an access burst segment consisting of the selected first preamble at a first discrete power level followed by a pilot, without any data of a message;

during transmitting of the pilot, listening for an acknowledgement signal from the base station;

if NO acknowledgement corresponding to the first preamble is detected while listening, selecting a second preamble from among preambles associated with the base station and spread-spectrum transmitting an access burst segment consisting of the second preamble at a second discrete power level higher than the first discrete power level followed by a pilot, without any data of a message;

upon detecting an acknowledgement corresponding to a transmitted preamble, ceasing access burst segment transmission; and

beginning transmission of packet data of a message, for reception by the base station, following cessation of access burst segment transmission.

62. The base-band processor of claim 61, wherein the first and second preambles are the same.

63. The base-band processor of claim 61, wherein the first and second preambles are different preambles.

64. The base-band processor of claim 61, wherein power level of each pilot is zero.

65. The base-band processor of claim 61, wherein the common channel broadcast received from the base station is a broadcast control channel (BCCH).

66. The base-band processor of claim 61, wherein the acknowledgement is a layer one (L1) acknowledgement.

67. The base-band processor of claim 61, wherein:

the acknowledgement is a layer one (L1) acknowledgement;

power level of each pilot is zero; and

the transmitted access preambles are the same.