Apparatus and method for use in effecting automatic repeat requests in wireless multiple access communications systems

• US 6,816,478 B1
• Filed: 11/03/2000
• Issued: 11/09/2004
• Est. Priority Date: 11/03/2000
• Status: Expired due to Term

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Uppala, Sathyadev Venkata, Laroia, Rajiv, Li, Junyi
• Primary Examiner(s): CUMMING, WILLIAM D
• Application Number:
  US09/706,132
• Time in Patent Office: 1,467 Days
• Field of Search: 370/278, 370/349, 370/437
• US Class Current: 370/349
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information

Abstract

In a wireless multiple access communications system a channel resource is managed by utilizing traffic segments and acknowledgment segments to determine if data traffic needs to be retransmitted. traffic data and has a prescribed finite time interval and bandwidth. Each traffic segment in a downlink or an uplink is associated with an acknowledgment segment in the uplink or downlink, respectively, in a fixed one-to-one manner. A base station uses the acknowledgment segments in the downlink to acknowledge the associated traffic segments successfully received in the uplink. A wireless terminal that receives a downlink traffic segment uses the associated acknowledgment segment in the uplink to acknowledge the traffic segment. The base station monitors all the acknowledgment segments to determine whether any of the traffic segments needs to be retransmitted.

Claims

1. A method for use in a wireless communications system comprising at least one base station and at least one wireless terminal and which communicate via downlink and uplink wireless channel resources comprising the steps of:

partitioning said wireless channel resource into at least an acknowledgment channel including one or more acknowledgment segments and a traffic channel including one or more traffic segments;

associating each of said acknowledgment segments with said traffic segments in a fixed one-to-one manner;

transmitting traffic data in a traffic segment; and

receiving an acknowledgment in an acknowledgment segment associated with said traffic segment transporting said traffic data, wherein said acknowledgment includes at least one logical bit of information indicating whether or not said traffic data has been successfully received.

2. The method as defined in claim 1 wherein said association of said acknowledgment segments and said traffic segments includes the acknowledgment segment having a prescribed delay interval relative to an associated traffic segment wherein said delay interval is greater than zero.

3. The method as defined in claim 1 wherein said acknowledgment segments transport additional information relating to said associated traffic segments.

4. The method as defined in claim 1 wherein said acknowledgment consists of one logical bit.

5. The method as defined in claim 1 wherein said step of receiving includes a step of detecting a logical state of said at least one logical bit of information to determine whether said traffic data has been successfully received.

6. The method as defined in claim 5 wherein said logical bit of information has a first logical state indicating that said traffic data has not been successfully received and a second logical state indicating that said traffic data has been successfully received.

7. The method as defined in claim 1 wherein each of said traffic segments has a prescribed finite time interval and bandwidth, and wherein each of said acknowledgment segments has a prescribed finite time interval and bandwidth.

25. The method as defined in claim 1 further includes the steps of

determining from said at least one logical bit whether said received acknowledgment indicates that the traffic data needs to be retransmitted, and

retransmitting said traffic data in said traffic segment when said determination so indicates.

26. The method as defined in claim 1 wherein in said base station said step of transmitting includes transmitting a traffic segment on said downlink wireless channel resource and said step of receiving includes receiving an acknowledgment segment on said uplink wireless channel resource.

27. The method as defined in claim 26 wherein said step of transmitting includes a step of dynamically allocating said downlink traffic segments to said active wireless terminals.

28. The method as defined in claim 1 wherein said acknowledgment does not include any sequence number associated with said traffic data transmitted in said traffic segment.

29. The method as defined in claim 1 wherein in said at least one wireless terminal said step of transmitting includes transmitting a traffic segment on said uplink wireless channel resource and said step of receiving includes receiving an acknowledgment segment on said downlink wireless channel resource.

30. The method as defined in claim 29 wherein said step of transmitting includes a step of dynamically allocating said uplink traffic segments to said wireless terminals.

31. The method as defined in claim 30 wherein a particular wireless terminal transmits an uplink traffic segment if said uplink traffic segment is allocated to said particular wireless terminal.

32. The method as defined in claim 25 wherein said base station transmits a downlink traffic segment to a particular wireless terminal if said downlink traffic segment is allocated to said particular wireless terminal.

8. A method for use in a wireless communications system comprising at least one base station and at least one wireless terminal which communicate via downlink and uplink wireless channel resources comprising the steps of:

partitioning said wireless channel resources into at least an acknowledgment channel including one or more acknowledgment segments and a traffic channel including one or more traffic segments;

associating each of said acknowledgment segments with said traffic segments in a fixed one-to-one manner;

receiving traffic data in a traffic segment; and

determining whether said received traffic data passes a prescribed error test,

in response to results of said error test, transmitting an acknowledgment in the acknowledgment segment associated with said traffic segment that transported said traffic data,

wherein said acknowledgment includes at least one logical bit of information indicating whether or not said error test has been passed.

9. The method as defined in claim 8 wherein said association of said acknowledgment segments and said traffic segments includes the acknowledgment segment having a prescribed delay interval relative to an associated traffic segment, wherein said delay interval is greater than zero.

10. The method as defined in claim 8 wherein said acknowledgment segments transport additional information relating to said associated traffic segments.

11. The method as defined in claim 8 wherein said step of transmitting includes a step of determining a logical state of said at least one logical bit of information to indicate whether said traffic data has been successfully received.

12. The method as defined in claim 11 wherein said logical bit of information has a first logical state indicating that said traffic data has not been successfully received and a second logical state indicating that said traffic data has been successfully received.

33. The method as defined in claim 8 wherein any acknowledgement carried by said acknowledgement segment does not include any sequence number associated with said traffic data transmitted in said traffic segment.

34. The method as defined in claim 8 wherein in said at least one wireless terminal said step of receiving includes receiving a traffic segment on said downlink wireless channel resource and said step of transmitting includes transmitting an acknowledgment segment on said uplink wireless channel resource.

37. The method as defined in claim 8 wherein in said base station said step of receiving includes receiving a traffic segment on said uplink wireless resource and said step of transmitting includes transmitting an acknowledgment segment on said downlink wireless channel resource.

38. The method as defined in claim 37 wherein said downlink acknowledgment channel are common to all active wireless terminals and said step of receiving includes the step of dynamically allocating said uplink traffic segments to said wireless terminals.

39. The method as defined in claim 38 wherein said base station receives an uplink traffic segment from a particular wireless terminal and transmits to said particular wireless terminal a downlink acknowledgment segment associated with said uplink traffic segment, if said uplink traffic segment is allocated to said particular wireless terminal.

40. The method as defined in claim 8 wherein said acknowledgment consists of one logical bit.

13. Apparatus for a wireless communications system comprising at least one base station and at least one wireless terminal and which communicate via downlink and unlink wireless channel resource comprising:

a partitioner for partitioning said wireless channel resource into at least an acknowledgment channel including one or more acknowledgment segments and a traffic channel including one or more traffic segments, and for associating each of said acknowledgment segments with each of said traffic segments in a fixed one-to-one manner;

a transmitter for transmitting traffic data in a traffic segment; and

a receiver for receiving an acknowledgment in an acknowledgment segment associated on a one-to-one basis with said traffic segment transporting said traffic data, wherein said acknowledgment includes at least one logical bit of information indicating whether or not said traffic data has been successfully received.

14. The apparatus as defined in claim 13 wherein said association of said acknowledgment segments and said traffic segments includes the acknowledgment segment having a prescribed delay interval relative to an associated traffic segment, wherein said delay interval is greater than zero.

15. The apparatus as defined in claim 13 wherein said acknowledgment segments transport additional information relating to said associated traffic segments.

16. The apparatus as defined in claim 13 further includes

a detector for determining whether said received acknowledgment indicates that the traffic data is to be retransmitted, said determination to retransmit said traffic data being made from said at least one logical bit; and

said transmitter being controlled in response to the results of said determination to retransmit said traffic data in said traffic segment when said determination so indicates.

17. The apparatus as defined in claim 16 wherein said detector detects a logical state of said at least one logical bit of information to determine whether said traffic data has been successfully received.

18. The apparatus as defined in claim 17 wherein said logical bit of information has a first logical state indicating that said traffic data has been successfully received and a second logical state indicating that said traffic data has not been successfully received.

19. The apparatus as defined in claim 13 wherein each of said acknowledgment segments has a prescribed finite time interval and bandwidth, and wherein each of said traffic segments has a finite time interval and bandwidth.

20. The apparatus as defined in claim 14 wherein in said base station said transmitter transmits a traffic segment on said downlink wireless channel resource and said receiver receives an acknowledgment segment on said uplink wireless channel resource, said base station further includes an allocator for dynamically said downlink traffic segments to said wireless terminals, and in said base station said transmitter transmits a downlink traffic segment to a particular wireless terminal if said allocator allocates said downlink traffic segment to said particular wireless terminal.

21. The apparatus as defined in claim 14 wherein in said at least one wireless terminal said transmits a traffic segment on said uplink wireless channel resource and said receiver receives an acknowledgment segment on said downlink wireless channel resource, and in said at least one wireless terminal said transmitter transmits an uplink traffic segment to said base station if said allocator allocates said uplink traffic segment to said particular wireless terminal.

41. The apparatus as defined in claim 19 wherein in said base station said transmitter is controlled to transmit a traffic segment on said downlink wireless channel resource and said receiver is controlled to receive an acknowledgment segment on said uplink wireless channel resource.

42. The apparatus as defined in claim 19 wherein said acknowledgment does not include any sequence number associated with said traffic data transmitted in said traffic segment.

43. The apparatus as defined in claim 19 wherein in said at least one wireless terminal said transmitter is controlled to transmit a traffic segment on said uplink wireless channel resource and said receiver is controlled to receive an acknowledgment segment on said downlink wireless channel resource.

44. The apparatus as defined in claim 43 wherein said transmitter is controlled to dynamically allocate said uplink traffic segments to said wireless terminals.

45. The apparatus as defined in claim 44 wherein said transmitter in a particular wireless terminal is controlled to transmit an uplink traffic segment if said uplink traffic segment is allocated to said particular wireless terminal.

46. The apparatus as defined in claim 41 wherein in said base station said transmitter transmits a downlink traffic segment to a particular wireless terminal if said downlink traffic segment is allocated to said particular wireless terminal.

53. The apparatus as defined in claim 14 wherein said acknowledgment consists of one logical bit.

22. Apparatus for a wireless communications system comprising at least one base station and at least one wireless terminal and which communicate via downlink and uplink wireless channel resources comprising:

a partitioner to partition said wireless channel resources into at least an acknowledgment channel including one or more acknowledgment segments and a traffic channel including one or more traffic segments, and to associate each of said acknowledgment segments with said traffic segments in a fixed one-to-one manner;

a receiver for receiving traffic data in a traffic segment;

a detector for determining whether said received traffic data passes a prescribed error test; and

a transmitter responsive to results of said error test for transmitting an acknowledgment in said acknowledgment segment associated on a one-to-one basis with said traffic segment that transported said traffic data,

wherein said acknowledgment includes at least one logical bit of information indicating whether or not said error test was passed.

23. The apparatus as defined in claim 22 wherein said acknowledgment segments transport additional information relating to said associated traffic segments.

24. The apparatus as defined in claim 22 wherein said detector detects a logical state of said at least one logical bit of information to determine whether said traffic data has been successfully received, and said logical bit of information has a first logical state indicating that said traffic data has been successfully received and a second logical state indicating that said traffic data has not been successfully received.

47. The apparatus as defined in claim 22 wherein any acknowledgement carried by said acknowledgment segment does not include any sequence number associated with said traffic data transmitted in said traffic segment.

48. The apparatus as defined in claim 22 wherein in said base station said receiver is controlled to receive a traffic segment on said uplink wireless channel resource and said transmitter is controlled to transmit an acknowledgment segment on said downlink wireless channel resource, and wherein said downlink acknowledgment channel is common to all active wireless terminals and said receiver is further controlled to dynamically allocate said uplink traffic segments to said wireless terminals.

49. The apparatus as defined in claim 48 wherein said receiver in a particular wireless terminal is controlled to receive a downlink traffic segment from said base station and said transmitter in said particular wireless terminal is controlled to transmit an uplink acknowledgment segment associated with said downlink traffic segment, if said downlink traffic segment is allocated to said particular wireless terminal.

50. The apparatus as defined in claim 22 wherein in said at least one wireless terminal said receiver is controlled to receive a traffic segment on said downlink wireless channel resource and said transmitter is controlled to transmit an acknowledgment segment on said uplink wireless channel resource.

51. The method as defined in claim 50 wherein said unlink acknowledgment channel is common to all active wireless terminals and said receiver is controlled to dynamically allocate said downlink traffic segments to said active wireless terminals.

52. The method as defined in claim 22 wherein in said base station said receiver is controlled to receive an uplink traffic segment from a particular wireless terminal and said transmitter is controlled to transmit to said particular wireless terminal a downlink acknowledgment segment associated with said uplink traffic segment, if said uplink traffic segment is allocated to said particular wireless terminal.

54. The apparatus as defined in claim 22 wherein in said base station said receiver receives a traffic segment on said uplink wireless channel resource and said transmitter transmits an acknowledgment segment on said downlink wireless channel resource.

57. The apparatus as defined in claim 22 wherein in said at least one wireless terminal said receiver receives a traffic segment on said downlink wireless channel resource and said transmitter transmits an acknowledgment segment on said uplink wireless channel resource.

58. The apparatus as defined in claim 57 wherein said base station further includes an allocator for dynamically allocating said downlink traffic segments to said wireless terminals, and in said wireless terminal said receiver receives a downlink traffic segment from said base station if said allocator allocates said downlink traffic segment to said particular wireless terminal.

59. The apparatus as defined in claim 58 wherein said uplink acknowledgment channel is common to all active wireless terminals, and in said wireless terminal said transmitter transmits to said base station an uplink acknowledgment segment associated with said downlink traffic segment, if said downlink traffic segment is allocated to said wireless terminal.

35. The method as defined in 34 wherein said uplink acknowledgment channel is common to all active wireless terminals and said step of receiving includes a step of dynamically allocating said downlink traffic segments to said wireless terminals.

36. The method as defined in claim 35 wherein a wireless terminal receives a downlink traffic segment from said base station and transmits to said base station an uplink acknowledgment segment associated with said downlink traffic segments, if said downlink traffic segment is allocated to said wireless terminal.

55. The apparatus as defined in 54 wherein said base station further includes an allocator for dynamically allocating said uplink traffic segments to said wireless terminals, and in said base station said receiver receives an uplink traffic segment from a particular wireless terminal if said allocator allocates said unlink traffic segment to said particular wireless terminal.

56. The apparatus as defined in claim 55 wherein said downlink acknowledgment channel is common to all active wireless terminals, and in said base station said transmitter transmits to a wireless terminal a downlink acknowledgment segment associated with said uplink traffic segment, if said unlink traffic segment is allocated to said wireless terminal.