Weighted open loop power control transmitter

• US 8,767,878 B2
• Filed: 06/13/2011
• Issued: 07/01/2014
• Est. Priority Date: 03/21/2000
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Zeira, Ariela, Shin, Sung-Hyuk
• Primary Examiner(s): Bocure, Tesfaldet
• Application Number:
  US13/159,068
• Publication Number:
  US 20110243259A1
• Time in Patent Office: 1,114 Days
• Field of Search: 375/219, 375/259, 375/295, 375/316, 375/358, 375/377
• US Class Current: 375/316
• CPC Class Codes: H04B 2201/709709 Methods of preventing interference
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/242 taking into account path loss
• 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 52/248 where transmission power control commands are generated based on a path parameter

Abstract

A weighted open loop power control transmitter for controlling transmission power levels using a spread spectrum time division duplex (TDD) technique having frames with timeslots for communication includes a demodulator configured to receive a transmitted signal from the receiver, a channel estimation device, a data estimation device, and a weighted open loop power controller. The weighted open loop power controller includes a power measurement device, a pathloss estimation device configured to receive an interpreted power level from the data estimation device and estimate the pathloss and update a long term average of the pathloss, a quality measurement device, and a transmit power calculation device for determining the transmitter'"'"'s power level and to control the receiver'"'"'s amplifier.

Claims

1. A user equipment comprising:

at least one component configured to receive a downlink signal in a first time interval and transmit an uplink signal in a second time interval;

wherein the first time interval and the second time interval are separated by a plurality of time intervals;

wherein the first time interval and the second time interval each include at least one slot, and the plurality of time intervals includes at least one slot;

wherein the at least one component is further configured to determine a transmit power level of the uplink signal by multiplying a pathloss by a parameter;

wherein the pathloss is derived from a received power level of a reference signal;

wherein the parameter is based on a number of slots in the plurality of time intervals separating the first time interval and the second time interval, and wherein the parameter has a value from 0 to 1.

2. The user equipment of claim 1 wherein the parameter is α

.

3. The user equipment of claim 1 wherein the at least one component is further configured to determine a time interval difference between the first time interval and the second time interval.

4. The user equipment of claim 3 wherein the determined transmit power level is further determined based on the downlink signal in the first time interval.

5. The method of claim 1 wherein the parameter is α

.

6. The method of claim 1 further comprising determining, by the user equipment, a time interval difference between the first time interval and the second time interval.

7. The method of claim 6 wherein the determined transmit power level is further determined based on the downlink signal in the first time interval.

8. The user equipment of claim 1, wherein the parameter has a value of 1 when the plurality of time intervals includes one slot.

9. The user equipment of claim 1, wherein the parameter has a value of 0 when the number of slots in the plurality of time intervals is equal to or greater than a predetermined maximum value.

10. The user equipment of claim 9, wherein the at least one component is further configured to determine the transmit power level of the uplink signal based on a long term average pathloss measurement when the number of slots in the plurality of time intervals is equal to or greater than the predetermined maximum value.

11. A method comprising:

receiving, by a user equipment, a downlink signal in a first time interval and transmit, by the user equipment, an uplink signal in a second time interval;

wherein the first time interval and the second time interval are separated by a plurality of time intervals;

wherein the first time interval and the second time interval each include at least one slot, and the plurality of time intervals includes at least one slot; and

determining, by the user equipment, a transmit power level of the uplink signal by multiplying a pathloss by a parameter;

wherein the pathloss is derived from a received power level of a reference signal and the parameter is based on a number of slots in the plurality of time intervals separating the first time interval and the second time interval, and wherein the parameter is a value from 0 to 1.

12. The method of claim 11, wherein the parameter has a value of 1 when the plurality of time intervals includes one slot.

13. The method of claim 11, wherein the parameter has a value of 0 when the number of slots in the plurality of time intervals is equal to or greater than a predetermined maximum value.

14. The method of claim 13, wherein determining, by the user equipment, the transmit power level of the uplink signal is based on a long term average pathloss measurement when the number of slots in the plurality of time intervals is equal to or greater than the predetermined maximum value.