Uplink power control using received reference signal

• US 9,137,813 B2
• Filed: 03/13/2014
• Issued: 09/15/2015
• Est. Priority Date: 05/14/2001
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Terry, Stephen E., Dick, Stephen G., Miller, James M., Zeira, Ariela, Zeira, Eldad M.
• Primary Examiner(s): Safaipour, Bobbak
• Application Number:
  US14/209,193
• Publication Number:
  US 20140194136A1
• Time in Patent Office: 551 Days
• Field of Search: 455/63.1, 455/67.11, 455/67.13, 455/69, 455/450, 455/522, 455/561, 455/452.2, 370/342, 370/347
• US Class Current: 1/1
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/246 where the output power of a terminal is based on a path parameter calculated in said terminal
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/26 using transmission rate or quality of service QoS [Quality of Service]
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A user equipment (UE) includes circuitry configured to receive control information on a downlink control channel from a base station. The control information indicates an allocation of an uplink channel and the control information is sent in response to the base station determining that the UE is to send an adaptive modulation and coding report. The circuitry is further configured in response to the control information to transmit a communication in the allocated uplink channel in a time interval including at least one time slot. The communication includes an adaptive modulation and coding report, and a transmission power level of the communication is derived from the control information and a pathloss measured by the UE.

Claims

1. A user equipment (UE) comprising:

circuitry configured to receive control information on a downlink control channel from a base station;

wherein the control information includes first information and second information;

wherein the first information is an allocation of an uplink channel and the second information is used to derive a modulation and coding for the uplink channel;

wherein the circuitry is further configured in response to receiving the control information to produce a communication for transmission in the allocated uplink channel in a time interval including at least one time slot;

wherein the communication includes an adaptive modulation and coding report;

wherein a transmission power level of the communication is derived from at least the second information and a pathloss measured by the UE.

2. The UE of claim 1 wherein the control information is transmitted to the UE from the base station in response to the base station determining that the UE should transmit an adaptive modulation and coding report.

3. A method comprising:

receiving, by a user equipment (UE), control information on a downlink control channel from a base station;

wherein the control information includes first information and second information;

wherein the first information is an allocation of an uplink channel and the second information is used to derive a modulation and coding for the uplink channel;

in response to receiving the control information, producing, by the UE, a communication for transmission in the allocated uplink channel in a time interval including at least one time slot;

wherein the communication includes an adaptive modulation and coding report;

wherein a transmission power level of the communication is derived from at least the second information and a pathloss measured by the UE.

4. The method of claim 3 wherein the control information is transmitted to the UE from the base station in response to the base station determining that the UE should transmit an adaptive modulation and coding report.

5. A base station comprising:

circuitry configured to determine that an adaptive modulation and coding report is to be sent from a user equipment (UE);

circuitry configured to provide a first information and second information;

wherein the first information is for use by the UE to determine a modulation and coding for an uplink communication and the second information indicating an allocation of an uplink channel;

circuitry configured, in response to determining that the UE is to transmit an adaptive modulation and coding report, to transmit control information including the first and second information over a downlink control channel; and

circuitry configured to receive the uplink communication from the UE in at least one time slot in the allocated uplink channel in response to the control information;

wherein the uplink communication includes an adaptive modulation and coding report and the uplink communication has a transmission power level derived at least from the second information.

6. The base station of claim 5 further comprising circuitry configured to measure a channel quality of the uplink channel in response to a previously received communication signal.

7. The base station of claim 5 wherein the transmission power level is further derived from a pathloss.