METHODS AND ARRANGEMENTS IN A WIRELESS COMMUNICATIONS SYSTEM

• US 20110004797A1
• Filed: 12/01/2008
• Published: 01/06/2011
• Est. Priority Date: 01/31/2008
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Sunell, Kai-Erik, Bergman, Johan, Gerstenberger, Dirk
• Granted Patent: US 8,738,983 B2
• Time in Patent Office: Days
• US Class Current: 714/748
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 1/189 Transmission or retransmission of more than one copy of a message

Abstract

The present invention relates to methods and arrangements that enable continuous adaptive control of the number of autonomous HARQ retransmissions. This is achieved by a solution, where the UE and the radio base station are using a number of autonomous HARQ retransmissions that can be adjusted based on observations in the UE and/or the radio base station. What is observed is the amount of HARQ retransmissions needed for the radio base station to correctly decode the latest received data packet(s).

Claims

1-30. -30. (canceled)

31. A method of uplink hybrid automatic repeat request (HARQ) retransmissions in a radio base station of a wireless communications system, said radio base station controlled by a radio network controller (RNC) and receiving data packets from at least one user equipment adapted use autonomous HARQ retransmissions for transmitting the data packets received at the radio base station, said method comprising, for each reception of a new data packet from the at least one user equipment:

observing the amount of HARQ retransmissions needed to correctly decode the latest at least one received data packet;

adjusting said number of autonomous HARQ retransmissions, based on the observed amount of HARQ retransmissions; and

transmitting a request for an adjustment of said number of autonomous HARQ retransmissions to the RNC, in order for the RNC to transmit a request for an adjustment to the user equipment and inform at least one soft handover radio base station, also receiving data packets from the at least one user equipment, about the adjustment.

32. The method of claim 31 wherein the adjustment comprises an increase or decrease by at least one of said number of autonomous HARQ retransmissions.

33. The method of claim 31 wherein the adjustment comprises setting said number of autonomous HARQ retransmissions to an absolute value.

34. The method of claim 31 wherein adjusting said number of autonomous HARQ retransmissions comprises adjusting said number of autonomous HARQ retransmissions according to a pre-determined rule that uses the observed amount of HARQ retransmissions as input.

35. The method of claim 34 wherein the pre-determined rule states that the adjusted number of autonomous HARQ retransmissions is equal to the observed amount of HARQ retransmission needed to correctly decode the latest received data packet, increased or decreased by at least one.

36. The method of claim 34 wherein the pre-determined rule states that the adjusted number of autonomous HARQ retransmissions is a statistical function of the observed amount of HARQ retransmission needed to correctly decode the latest at least two received data packets.

37. A method of uplink hybrid automatic repeat request (HARQ) retransmissions in a user equipment of a wireless communications system, wherein the user equipment transmits data packets to at least one radio base station, and is adapted to use autonomous HARQ retransmissions for said data packet transmission, said method comprising, for at least one transmission of a new data packet to the at least one radio base station:

receiving a request for an adjustment of said number of autonomous HARQ retransmissions; and

adjusting said number of autonomous HARQ retransmissions, based on an observed amount of HARQ retransmissions, according to the received request.

38. The method of claim 37, wherein the request for an adjustment is received via an order on a High Speed Shared Control Channel (HS-SCCH).

39. The method of claim 37, wherein the request for an adjustment is received via an Enhanced Dedicated Channel Absolute Grant Channel (E-AGCH).

40. The method of claim 37 wherein the adjustment comprises an increase or decrease by at least one of said number of autonomous HARQ retransmissions.

41. The method of claim 37 wherein the adjustment comprises setting said number of autonomous HARQ retransmissions to an absolute value.

42. The method of claim 37 wherein adjusting said number of autonomous HARQ retransmissions comprises:

observing the amount of HARQ retransmission needed to correctly transmit the latest at least one transmitted data packet; and

adjusting said number of autonomous HARQ retransmissions according to a pre-determined rule that uses said observed amount of HARQ retransmissions as input.

43. The method of claim 42, wherein the pre-determined rule states that the adjusted number of autonomous HARQ retransmissions is equal to the observed amount of HARQ retransmission needed to correctly transmit the latest transmitted data packet, increased or decreased by a at least one.

44. The method of claim 42, wherein the pre-determined rule states that the adjusted number of autonomous HARQ retransmissions is a statistical function of the observed amount of HARQ retransmission needed to correctly transmit the latest at least two transmitted data packets.

45. A radio base station of a wireless communications system, adapted to receive data packets from at least one user equipment adapted to use autonomous hybrid automatic repeat request (HARQ) retransmissions for transmitting the data packets received at the radio base station, said radio base station comprising:

an observing function operative to observe the amount of HARQ retransmissions needed to correctly decode the latest at least one received data packet;

an adjusting function operative to adjust said number of autonomous HARQ retransmissions based on the observed amount of HARQ retransmissions; and

a transmitter operative to transmit a request for an adjustment of said number of autonomous HARC retransmissions to a radio network controller (RNC).

46. The radio base station of claim 45, wherein the adjustment comprises an increase or decrease by at least one of said number of autonomous HARQ retransmissions.

47. The radio base station of claim 45, wherein the adjustment comprises setting said number of autonomous HARQ retransmissions to an absolute value.

48. The radio base station of claim 45 wherein the transmitter is operative to transmit the request for an adjustment of said number of autonomous HARC retransmissions to the RNC in order for the RNC to inform at least one soft handover radio base station, also receiving data packets from the at least one user equipment, about the adjustment.

49. The radio base station of claim 45 wherein the adjusting function is further operative to adjust said number of autonomous HARQ retransmissions according to a pre-determined rule that uses the observed amount of HARQ retransmissions as input.

50. The radio base station of claim 49 wherein the pre-determined rule slates that the adjusted number of autonomous HARQ retransmissions is equal to the observed amount of HARQ retransmission needed to correctly decode the latest received data packet, increased or decreased by at least one.

51. The radio base station of claim 49 wherein the pre-determined rule states that the adjusted number of autonomous HARQ retransmissions is a statistical function of the observed amount of HARQ retransmission needed to correctly decode the latest at least two received data packets.

52. A user equipment of a wireless communications system, adapted to transmit data packets to at least one radio base station, and adapted to use autonomous hybrid automatic repeat request (HARQ) retransmissions for said data packet transmission, said user equipment comprising:

a receiver operative to receive a request for an adjustment of said number of autonomous HARQ retransmissions; and

an adjusting function operative to adjust said number of autonomous HARQ retransmissions, based on an observed amount of HARQ retransmissions, according to the received request.

53. The user equipment of claim 52 wherein the adjustment comprises an increase or decrease by at least one of said number of autonomous HARQ retransmissions.

54. The user equipment of claim 52 wherein the adjustment comprises setting said number of autonomous HARO retransmissions to an absolute value.

55. The user equipment of claim 52 wherein the adjusting function comprises:

an observing function operative to observe the amount of HARQ retransmission needed to correctly transmit the latest at least one transmitted data packet; and

an adjusting function operative to adjust said number of autonomous HARQ retransmissions according to a pre-determined rule that uses said observed amount of HARQ retransmissions as input.

56. The user equipment of claim 55 wherein the pre-determined rule states that the adjusted number of autonomous HARQ retransmissions is equal to the observed amount of HARO retransmission needed to correctly transmit the latest transmitted data packet, increased or decreased by a at least one.

57. The user equipment of claim 55 wherein the pre-determined rule states that the adjusted number of autonomous HARQ retransmissions is a statistical function of the observed amount of HARQ retransmission needed to correctly transmit the latest at least two transmitted data packets.