# US 8,543,154 B2 · Methods of reverse link power control

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- Number: US 8,543,154 B2
- Document ID: US8543154B2
- Status: Granted
- Kind: B2
- Application number: 13/494,305
- Filed: 2012-06-12
- Published: 2012-10-04
- Granted: 2013-09-24
- Earliest claimed: 2006-02-17
- Assignees: Alcatel Lucent
- Applicants: Suman Das; Shirish Nagaraj; Harish Viswanathan
- Inventors: Suman Das; Shirish Nagaraj; Harish Viswanathan
- Web page: https://patentgrep.com/patent/US8543154B2

## CPC

- H04W 52/243: {taking into account interferences}
- H04L 5/0016: {Time-frequency-code}
- H04L 27/0008: {arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453)}
- H04W 52/146: {Uplink power control}
- H04W 52/16: Deriving transmission power values from another channel
- H04W 52/24: using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W 52/36: with a discrete range or set of values, e.g. step size, ramping or offsets
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04W 52/247: {where the output power of a terminal is based on a path parameter sent by another terminal}
- H04W 52/362: {Aspects of the step size}
- H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Methods of reverse link power control are provided. A first example method includes first adjusting OFDMA transmission power based on first feedback signals during an OFDMA transmission and second adjusting OFDMA transmission power based on second feedback signals during periods between OFDMA transmissions. A second example method includes sending first power adjustment indicators based on measured OFDMA SINRs when receiving OFDMA transmissions from a mobile station and sending second power adjustment indicators based on estimated OFDMA SINRs when not receiving OFDMA transmissions from the mobile station. A third example method includes receiving a plurality of interference indicating signals from different base stations and determining whether to adjust a maximum transmit power threshold based on the plurality of interference indicating signals, the maximum transmit power threshold indicating the maximum permitted transmission power level below which transmissions are constrained.

## Claims

### Claim 1

A method of controlling reverse link transmission power in a wireless communications network, comprising:
first adjusting OFDMA transmission power based on first feedback signals during an OFDMA transmission;
second adjusting OFDMA transmission power based on second feedback signals during periods between OFDMA transmissions; and
controlling reverse link transmission power according to the first adjusting and the second adjusting.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first feedback signals are based on a measured OFDMA SINR and the second feedback signals are based on an estimated OFDMA SINR.

### Claim 3

A method of controlling reverse link transmission power in a wireless communications network, comprising:
sending first power adjustment indicators based on measured OFDMA SINRs when receiving OFDMA transmissions from a mobile station; and
sending second power adjustment indicators based on estimated OFDMA SINRs when not receiving OFDMA transmissions from the mobile station; and
calculating a power level for reverse link transmissions based on the first power adjustment indicators and the second power adjustment indicators.

### Claim 4 (depends on 3)

The method of claim 3, wherein the estimated OFDMA SINRs are based on (i) previous OFDMA transmissions and (ii) CDMA transmissions received after (i).