US 7,096,034 B2 · System and method for reducing power consumption for wireless communications by mobile devices

Abstract

A power control scheme for a wireless network communication system that includes a base station and multiple wireless mobile device dynamically adjusts transmission power of a mobile device in conjunction with adjusting its bit allocation in source coding and channel coding to minimize its total power consumption while maximizing the system capacity in terms of the total effective transmission rates received by the base station. The base station sets a target signal quality value for each mobile station, and the target values are determined by the base station such that the total effective data rate from all the mobile devices is maximized under constraints of the total received power and the error protection level requirements for the mobile devices. The base station periodically measures a signal quality value, such as a signal-to-interference ratio (SIR), from transmissions received by the base from each mobile device, compares it with the measured signal quality value for that mobile device, and sends a control signal instructing the mobile device to increase or decrease its transmission power based on the result of the comparison. When the mobile device receives the control signal, it determines an amount of adjustment to its transmission power by performing a minimum calculation under constraints on the total data distortion and the maximum transmission rate to adjust the parameters for source coding, channel coding, and transmission under the constraints to result in a redistribution of power between the components that provides the minimized total power consumption.

Claims18

Dependent claims

A computer-readable medium having computer-executable instructions for performing steps of a power control scheme for network communications between a base station and a plurality of mobile devices, the steps comprising:

setting, by the base station, a target signal quality value for each of the mobile devices through a constrained maximization calculation to maximize a total effective data rate of wireless transmissions from the mobile devices;
periodically deriving, by the base station a measured value of a signal quality parameter for each mobile device based on transmissions received from said each mobile device;
comparing, by the base station, the measured values of the signal quality parameter for said each mobile device to the target signal quality value for said each mobile device;
transmitting, by the base station, an instruction signal to said each mobile device to adjust a transmission power of said each mobile device;
determining, by said each mobile device in response to the instruction signal from the base station, an amount of adjustment to a transmission power of said each mobile device based on a constrained minimization calculation to minimize a total power consumption of said each mobile device via a reallocation of power among the transmission power and coding components of the total power consumption;
and
adjusting, by said each mobile device, the transmission power by said amount of adjustment in conjunction with the reallocation of power to the coding components of the total power consumption, and,
wherein the reallocation of power results in a changed error protection level of said each mobile device, the computer-readable medium including further computer-executable instructions for said each mobile device to send an information packet to the base station specifying the changed error protection level of said each mobile device.

5 more elements

A computer network comprising:

a base station;
a plurality of mobile devices communicating with the base stations by wireless transmissions, the base station being programmed to perform to set a target signal quality value for each of the mobile devices through a constrained maximization calculation to maximize a total effective data rate of wireless transmissions from the mobile devices, periodically derive a measured value of a signal quality parameter for each mobile device based on transmissions received from said each mobile device, compare the measured values of the signal quality parameter for said each mobile device to the target signal quality value for said each mobile device, and transmit an instruction signal to said each mobile device to adjust a transmission power of said each mobile device;
said each mobile device being programmed to determine, in response to the instruction signal from the base station, an amount of adjustment to a transmission power of said each mobile device based on a constrained minimization calculation to minimize a total power consumption of said each mobile device via a reallocation of power among the transmission power and coding components of the total power consumption, and adjust the transmission power by said amount of adjustment in conjunction with the reallocation of power to the coding components of the total power consumption;
and,
wherein the reallocation of power results in a changed error protection level of said each mobile device, and wherein said each mobile device is programmed to send an information packet to the base station specifying the changed error protection level of said each mobile device.

2 more elements

Dependencies are inferred from the claim text.

System and method for reducing power consumption for wireless communications by mobile devices

Life of this patent

System and method for reducing power consumption for wireless communications by mobile devices

Life of this patent

Abstract

Claims18