Uplink Pathloss Gap Offset for Wireless Power Control

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Solution Overview

Problem

In Fourth Generation wireless communication systems, especially in FDD systems with gain mismatch, the estimated uplink pathloss is typically smaller than the actual, leading to insufficient power transmission by mobile stations during initial network entry or recovery from idle state, potentially causing failure in connecting to the base station.

Innovation Solution

Implementing methods to estimate and compensate for the gap between downlink and uplink pathloss by setting initial offset values or directly applying the estimated gap into pathloss estimation values within IEEE 802.16 and LTE standards, ensuring accurate power adjustment during initial ranging and network entry.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If downlink pathloss measurement is used to estimate uplink pathloss, then the mobile station can determine transmit power, but the estimated value is smaller than actual uplink pathloss causing insufficient power transmission

Engineering Contradiction:

Improveuplink pathloss estimation accuracyVSAvoidnetwork entry success rate

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies preliminary action by introducing an offset value before the mobile station transmits uplink signals. This offset is added to the downlink pathloss measurement to pre-compensate for the expected underestimation, ensuring the mobile station transmits with sufficient power from the outset during initial network entry or idle state recovery

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the parameter of pathloss estimation by adding an offset value to the measured downlink pathloss. This parameter adjustment transforms the underestimated pathloss value into a corrected value that accounts for gain mismatch, thereby improving both measurement precision and network entry reliability

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If the mobile station transmits at lower power based on underestimated pathloss, then energy consumption is reduced, but initial network entry or connection fails

Engineering Contradiction:

Improvemobile station transmit powerVSAvoidconnection establishment

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The offset value is applied in advance during initial network entry or when recovering from idle state, before actual data transmission begins. This preliminary power compensation ensures connection establishment succeeds while avoiding excessive power consumption during subsequent normal operation where base station can adjust offsets

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8472993B2Downlink and uplink pathloss estimation gap adjustment scheme for wireless systems

Publication Date: 2013.06.25 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Briefly, in accordance with one or more embodiments, a pathloss gap between a downlink pathloss from a base station to a mobile station and an uplink pathloss from the mobile station to the base station is estimated. An initial offset value for uplink power control of the estimated pathloss gap is calculated based at least in part on said estimating. An offset value for an uplink data channel or an uplink control channel, or combinations thereof, is set based at least in part on the initial offset value. The pathloss gap for uplink power control is compensated using the set offset value.