APPARATUS AND METHOD FOR MOVING A RECEIVE WINDOW IN A RADIO ACCESS NETWORK

• US 20080267163A1
• Filed: 07/10/2008
• Published: 10/30/2008
• Est. Priority Date: 11/07/2002
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Young Dae, Yi, Seung June, Lee, So Young
• Granted Patent: US 7,903,663 B2
• Time in Patent Office: Days
• US Class Current: 370/349
• CPC Class Codes: H04L 1/1685 the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 1/1832 Details of sliding window management
• CPC Class Codes: H04L 1/187 Details of sliding window management
• CPC Class Codes: H04L 1/1877 for semi-reliable protocols, e.g. for less sensitive applications like streaming video buffer level management for video bitstream control arrangements H04N21/44004
• CPC Class Codes: H04L 1/188 Time-out mechanisms
• CPC Class Codes: H04L 47/225 Determination of shaping rate, e.g. using a moving window
• CPC Class Codes: H04L 47/34 ensuring sequence integrity, e.g. using sequence numbers
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/065 using assembly or disassembly of packets
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02

Abstract

A method of moving a receiving window in a wireless mobile communication system, wherein the AM RLC of the transmitting side sends information of the last discarded SDU regardless of continuity of the discarded SDUs. The AM RLC of the receiving side checks whether all SDUs from the start point of the receiving window up to the last discarded SDU are successfully received, delivers the SDUs that are successfully received to an upper layer, and discard only those SDUs that are not successfully received.

Claims

1-22. -22. (canceled)

23. A data communication method in a radio communication system, the method comprising:

receiving a move receiving window (MRW) command; and

delivering, to an upper layer, successfully received service data units (SDUs) among data units prior to a position indicated by the MRW command.

24. The method of claim 23, wherein the MRW command is transmitted through a radio environment.

25. The method of claim 23, wherein the data units are SDUs of a data link layer.

26. The method of claim 25, wherein the data units are radio link control (RLC) SDUs.

27. The method of claim 23, wherein the SDUs are identified by a SDU boundary indicator.

28. The method of claim 27, wherein the SDU boundary indicator is included in a protocol data unit (PDU) of a data link layer.

29. The method of claim 23, further comprising discarding SDUs that are not yet successfully received.

30. The method of claim 23, wherein the position that is indicated by the MRW command indicates an end point of a last discarded SDU.

31. The method of claim 23, wherein the receiving and delivering are performed in a receive-response mode.

32. The method of claim 23, wherein the MRW command comprises:

a sequence number of a protocol data unit (PDU) with an end point of a last discarded SDU; and

an end point indicator indicating the end point of the last discarded SDU in the PDU.

33. The method of claim 23, further comprising:

moving the MRW to the position indicated by the MRW command.

34. The method of claim 33, wherein moving the MRW is performed in a data link layer.

35. A method for moving a receiving window in a radio communication system, the method comprising:

receiving information of a last discarded service data unit (SDU) from a transmitting side;

checking whether service data units (SDUs) prior to the last discarded SDU are successfully received within the receiving window; and

delivering the SDUs that are successfully received to a upper layer and moving the receiving window according to the received information.

36. The method of claim 35, wherein the SDU is a radio link control (RLC) SDU.

37. The method of claim 35, wherein the information of the last discarded SDU comprises:

a sequence number of a protocol data unit (PDU) with an end point of the last discarded SDU; and

an end point indicator indicating the end point of the last discarded SDU in the PDU.

38. The method of claim 35, wherein moving the receiving window is performed in a data link layer.

39. The method of claim 35, wherein the SDU is identified by an end point indicator.

40. The method of claim 35, wherein the checking comprises:

identifying data from a portion indicated by one SDU end point indicator to a portion indicated by an adjacent SDU end point indicator as one SDU; and

determining that the SDU is successfully received if all portions of the identified one SDU are received.

41. A method of receiving data in a wireless communication system, the method comprising:

receiving protocol data units in a receiver, each of the protocol data units including at least a portion of a service data unit;

receiving a command in the receiver to adjust a receiving window, the receiving window having a start point; and

delivering, to an upper layer of the receiver, at least one service data unit that is successfully received from at least one protocol data unit received between the start point and a position identified by the command.

42. The method of claim 41, wherein the command identifies a last discarded service data unit.

43. The method of claim 41, further comprising discarding any service data unit between the start point and the position in the receiving window identified by the command that is not delivered to the upper layer.

44. The method of claim 41, wherein the command identifies a protocol data unit.

45. The method of claim 41, wherein a boundary indicator included in a protocol data unit is used to determine the at least one service data unit delivered to the upper layer.

46. The method of claim 45, wherein the boundary indicator is included in a header of the protocol data unit.

47. The method of claim 41, further comprising:

discarding service data units not yet successfully received.

48. The method of claim 41, further comprising:

moving the start point to the position identified by the command.

49. A communication apparatus for receiving data in a wireless communication system, the communication apparatus comprising:

a receiving unit configured to receive protocol data units, each of the protocol data units comprising at least a portion of a service data unit; and

a processing unit configured to receive a command to adjust a receiving window having a start point and deliver, to an upper layer, at least one service data unit that is successfully received from at least one protocol data unit received prior to a position identified by the command.

50. The communication apparatus of claim 49, wherein the command identifies a last discarded service data unit.

51. The communication apparatus of claim 49, wherein the processing unit discards any service data unit between the start point and the position in the receiving window identified by the command that is not delivered to the upper layer.

52. The communication apparatus of claim 49, wherein the command identifies a protocol data unit.

53. The communication apparatus of claim 49, wherein the processing unit uses a boundary indicator included in a protocol data unit to determine the at least one service data unit delivered to the upper layer.

54. The communication apparatus of claim 53, wherein the processing unit extracts the boundary indicator from a header of the protocol data unit.

55. The communication apparatus of claim 49, wherein the processing unit discards service data units not yet successfully received.

56. The communication apparatus of claim 49, wherein the processing unit moves the start point to the position identified by the command.

57. The communication apparatus of claim 49, wherein the processing unit is part of a data link layer.

58. The communication apparatus of claim 49, wherein the command comprises discard information identifying a last discarded service data unit, and the processing unit determines whether service data units were successfully received prior to the last discarded service data unit and delivers the successfully received service data units to the upper layer.

59. The communication apparatus of claim 58, wherein the discard information comprises a sequence number and an end point indicator, the sequence number identifying a protocol data unit comprising an end point of the last discarded service data unit and the end point indicator indicating the end point of the last discarded service data unit in the protocol data unit.

60. The communication apparatus of claim 59, wherein the processing unit uses the end point indicator to identify the service data units that were successfully received.

61. The communication apparatus of claim 58, wherein the discard information comprises a first end point indicator and a second end point indicator, and the processing unit identifies data from a location indicated by the first end point indicator to a location indicated by the second end point indicator as one service data unit and determines that the service data unit was successfully received if all portions of the identified one service data unit were received.