METHODS AND APPARATUS FOR POWER CONTROL FOR HIGH-EFFICIENCY SCHEDULING IN TD-SCDMA HSUPA

• US 20140056239A1
• Filed: 12/01/2010
• Published: 02/27/2014
• Est. Priority Date: 12/01/2010
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Guo, Jiming, Fan, Mingxi, Chen, Bo, Zhang, Jainqiang
• Application Number:
  US13/882,246
• Publication Number:
  US 20140056239A1
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/286 during data packet transmission, e.g. high speed packet access [HSPA]
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/1268 of uplink data flows

Abstract

Certain aspects of the present disclosure propose techniques for power control for high-efficiency scheduling for Time Division Synchronous Code Division Multiple Access (TD-SCDMA) High Speed Uplink Packet Access (HSUPA). The basic principle of this power control for a scheduled Enhanced Dedicated Channel (E-DCH) Physical Uplink Channel (E-PUCH) is that all information for a transport block size (TBS) decision is made available at a user equipment (UE). Certain aspects provide a method for wireless communications. The method generally includes receiving, from a UE, an uplink signal, determining a reference uplink power level based on a filtered interference power of the received signal, and transmitting an indication of the reference uplink power level to the UE.

Claims

1-44. -44. (canceled)

45. A method for wireless communications, comprising:

transmitting, to a Node B, an uplink signal;

receiving, from the Node B, an indication of a reference uplink power level based on a filtered interference power of the transmitted uplink signal;

determining a transport block size (TBS) based on the reference uplink power level; and

transmitting, to the Node B, a packet according to the TBS.

46. The method of claim 45, wherein the uplink signal comprises a request for scheduling information.

47. The method of claim 46, wherein the request for the scheduling information is transmitted via an Enhanced Dedicated Channel (E-DCH) Physical Channel (E-PUCH) or an E-DCH Random Access Uplink Control Channel (E-RUCCH).

48. The method of claim 45, further comprising:

determining a serving and neighbor cell path loss (SNPL); and

determining a maximum allowed transmit power based on the determined SNPL and a SNPL target.

49. The method of claim 48, wherein the receiving comprises receiving the indication of the reference uplink power level via an Enhanced Dedicated Channel (E-DCH) Absolute Grant Channel (E-AGCH).

50. The method of claim 49, further comprising:

measuring a received signal code power of the E-AGCH for the n^th transmission time interval (TTI); and

determining a channel condition based on an instantaneous channel condition C(n)=RSCP_EAGCH(n)−

P_e-base(n), wherein P_e-base(n) is the reference uplink power level for the n^th TTI and wherein RSCP_EAGCH(n) is the measured received signal code power.

51. The method of claim 50, wherein determining the TBS comprises determining the TBS based on the maximum allowed transmit power and the channel condition.

52. The method of claim 51, wherein determining the TBS further comprises determining the TBS based on a spread factor (SF) and an out-loop margin (Δ

_outloop(n)).

53. The method of claim 50, wherein determining the channel condition comprises determining a filtered channel condition C(n)= C(n−

m)+(1−

μ

^m)C(n), wherein μ

is a speed-dependent parameter, m is a time of the most recent E-PUCH transmission, and C(n) is the instantaneous channel condition.

54. The method of claim 45, wherein the reference uplink power level comprises a reference desired Enhanced Dedicated Channel (E-DCH) Physical Uplink Channel (E-PUCH) received power known as P_e-base.

55. (canceled)

56. An apparatus for wireless communications, comprising:

means for transmitting, to a Node B, an uplink signal;

means for receiving, from the Node B, an indication of a reference uplink power level based on a filtered interference power of the transmitted uplink signal; and

means for determining a transport block size (TBS) based on the reference uplink power level, wherein the means for transmitting is configured to transmit, to the Node B, a packet according to the TBS.

57-66. -66. (canceled)

67. An apparatus for wireless communications, comprising:

a transmitter configured to transmit, to a Node B, an uplink signal;

a receiver configured to receive, from the Node B, an indication of a reference uplink power level based on a filtered interference power of the transmitted uplink signal; and

at least one processor configured to determine a transport block size (TBS) based on the reference uplink power level, wherein the transmitter is configured to transmit, to the Node B, a packet according to the TBS.

68. The apparatus of claim 67, wherein the uplink signal comprises a request for scheduling information.

69. The apparatus of claim 68, wherein the transmitter is configured to transmit the request for the scheduling information via an Enhanced Dedicated Channel (E-DCH) Physical Channel (E-PUCH) or an E-DCH Random Access Uplink Control Channel (E-RUCCH).

70. The apparatus of claim 67, wherein the at least one processor is further configured to:

determine a serving and neighbor cell path loss (SNPL); and

determine a maximum allowed transmit power based on the determined SNPL and a SNPL target.

71. The apparatus of claim 70, wherein the receiver is configured to receive the indication of the reference uplink power level via an Enhanced Dedicated Channel (E-DCH) Absolute Grant Channel (E-AGCH).

72. The apparatus of claim 71, wherein the at least one processor is further configured to:

measure a received signal code power of the E-AGCH for the n^th transmission time interval (TTI); and

determine a channel condition based on an instantaneous channel condition C(n)=RSCP_EAGCH(n)−

P_e-base(n), wherein P_e-base(n) is the reference uplink power level for the n^th TTI and wherein RSCP_EAGCH(n) is the measured received signal code power.

73. The apparatus of claim 72, wherein the at least one processor is configured to determine the TBS by determining the TBS based on the maximum allowed transmit power and the channel condition.

74. The apparatus of claim 73, wherein the at least one processor is further configured to determine the TBS by determining the TBS based on a spread factor (SF) and an out-loop margin (Δ

_outloop(n)).

75. The apparatus of claim 72, wherein the at least one processor is configured to determine the channel condition by determining a filtered channel condition C(n)= C(n−

m)+(1−

μ

^m)C(n), wherein μ

is a speed-dependent parameter, m is a time of the most recent E-PUCH transmission, and C(n) is the instantaneous channel condition.

76. The apparatus of claim 67, wherein the reference uplink power level comprises a reference desired Enhanced Dedicated Channel (E-DCH) Physical Uplink Channel (E-PUCH) received power known as P_e-base.

77. (canceled)

78. A computer-program product for wireless communications, the computer-program product comprising:

a non-transitory computer-readable medium comprising code for;

transmitting, to a Node B, an uplink signal;

receiving, from the Node B, an indication of a reference uplink power level based on a filtered interference power of the transmitted uplink signal;

determining a transport block size (TBS) based on the reference uplink power level; and

transmitting, to the Node B, a packet according to the TBS.

79-88. -88. (canceled)