Uplink power control for distributed wireless communication

• US 9,232,416 B2
• Filed: 06/03/2014
• Issued: 01/05/2016
• Est. Priority Date: 12/03/2008
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Lin, Zinan, Reznik, Alexander, Chitrapu, Prabhakar R., Beluri, Mihaela C., Zeira, Eldad M., Pietraski, Philip J., Shin, Sung-Hyuk, Charlton, Gregg A.
• Primary Examiner(s): GESESSE, TILAHUN
• Application Number:
  US14/294,590
• Publication Number:
  US 20140269958A1
• Time in Patent Office: 581 Days
• Field of Search: 455/522, 455/69, 455/127.1
• US Class Current: 1/1
• CPC Class Codes: H04B 7/2615 using hybrid frequency-time division multiple access [FDMA-TDMA]
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 52/0209 in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/46 in multi hop networks, e.g. wireless relay networks
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure
• CPC Class Codes: H04W 92/20 between access points
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus for power control for distributed wireless communication is disclosed including one or more power control loops associated with a wireless transmit/receive unit (WTRU). Each power control loop may include open loop power control or closed loop power control. A multi-phase power control method is also disclosed with each phase representing a different time interval and a WTRU sends transmissions at different power levels to different set of node-Bs or relay stations during different phases to optimize communications.

Claims

1. A wireless transmit/receive unit (WTRU) comprising:

circuitry configured to determine a first set of transmission time intervals and a second set of transmission time intervals;

wherein the circuitry is further configured to determine a first closed loop power control factor for the first set of transmission time intervals and a second closed loop power control factor for the second set of transmission time intervals;

wherein the first closed loop power control factor is derived by accumulating first power commands and the second closed loop power control factor is derived by combining second power commands;

wherein the first and second power commands are different; and

wherein the circuitry is further configured to transmit in a transmission time interval of the first set of transmission time intervals at a transmission power level based on the first closed loop power control factor and to transmit in a transmission time of the second set of transmission time intervals at a transmission power level based on the second closed loop power control factor.

2. The WTRU of claim 1, wherein the first closed loop power control factor and the second closed loop power control factor are independent.

3. The WTRU of claim 1, wherein the transmissions of the first set of transmission time intervals and the second set of transmission time intervals are single-carrier frequency division multiple access (SC-FDMA) transmissions.

4. The WTRU of claim 1, wherein the WTRU is a long term evolution (LTE) WTRU.

5. A method for use in a wireless transmit/receive unit, comprising:

determining, by the WTRU, a first set of transmission time intervals and a second set of transmission time intervals;

determining, by the WTRU, a first closed loop power control factor for the first set of transmission time intervals and a second closed loop power control factor for the second set of transmission time intervals;

wherein the first closed loop power control factor is derived by accumulating first power commands and the second closed loop power control factor is derived by combining second power commands;

wherein the first and second power commands are different; and

transmitting, by the WTRU, in a transmission time interval of the first set of transmission time intervals at a transmission power level based on the first closed loop power control factor and transmitting, by the WTRU, in a transmission time interval of the second set of transmission time intervals at a transmission power level based on the second closed loop power control factor.

6. The method of claim 5, wherein the first closed loop power control factor and the second closed loop power control factor are independent.

7. The method of claim 5, wherein the transmissions of the first set of transmission time intervals and the second set of transmission time intervals are single-carrier frequency division multiple access (SC-FDMA) transmissions.

8. The method of claim 5, wherein the WTRU is a long term evolution (LTE) WTRU.

9. An evolved nodeB (eNodeB), comprising:

circuitry configured to determine a first set of transmission time intervals and a second set of transmission time intervals for a wireless transmit/receive unit (WTRU);

wherein the circuitry is further configured to establish a first closed power control loop for the first set of transmission time intervals and a second closed power control loop for the second set of transmission time intervals;

wherein first power commands are transmitted for the first closed power control loop and second power commands are transmitted for the second closed power control loop;

wherein the first and second power commands are different; and

wherein the circuitry is further configured to receive a transmission in a transmission time interval of the first set of transmission time intervals that was transmitted at a transmission power level based on the first closed power control loop and to receive a transmission in a transmission time interval of the second set of transmission time intervals that was transmitted at a transmission power level based on the second closed power control loop.

10. The eNodeB of claim 9, wherein the first closed power control loop and the second closed power control loop are independent.

11. The eNodeB of claim 9, wherein the received transmissions of the transmission time intervals of the first set of transmission time intervals and the second set of transmission time intervals are single-carrier frequency division multiple access (SC-FDMA) transmissions.