PRACH Uplink Power Selection After Initial Access

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Solution Overview

Problem

Existing methods for determining uplink power levels in wireless communication systems often result in excessive power consumption during initial random access procedures, as they are based solely on downlink communication measurements, leading to inefficient power usage.

Innovation Solution

A wireless communication device selects an uplink power level calculation technique based on an indication received from a base station, allowing for more efficient power usage while ensuring sufficient signal strength for the initial message transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If uplink power level is determined based on downlink communication measurements, then the transmission power can be adjusted to ensure sufficient signal strength, but the power consumption becomes excessive during initial random access procedures

Engineering Contradiction:

Improvesignal reception reliabilityVSAvoiduplink transmission power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic selection between multiple power level calculation techniques (first technique based on downlink measurements, second technique based on other criteria) depending on the operational context. The system dynamically switches between different power determination approaches to optimize the balance between signal reliability and power consumption during random access procedures

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameters used for power level calculation by introducing multiple calculation techniques with different input parameters. The first technique uses downlink communication measurements, while the second technique uses alternative parameters, allowing the system to select the most appropriate parameter set for the current operational scenario

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If a single uplink power level calculation technique is used, then the system complexity is reduced, but the adaptability to different communication scenarios is limited

Engineering Contradiction:

Improvepower control system complexityVSAvoidpower level calculation adaptability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent segments the power level calculation process into multiple distinct techniques, each optimized for specific scenarios. By dividing the overall power control function into separate calculable modules (first calculation technique, second calculation technique), the system can select and apply the most appropriate segment for each operational context without managing excessive complexity

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12507284B2Enhanced uplink power control for physical random access channel after initial access

Publication Date: 2025.12.23 QUALCOMM INC

AI summary

Aspects of the disclosure relate to a wireless communication device selecting an uplink (UL) power level for an initial message in a random access procedure. For example, the wireless communication device may receive, via a transceiver, an indication that indicates an UL power level calculation technique to use for a random access procedure. The wireless communication device may further determine an UL power level for an initial message in the random access procedure using the UL power level calculation technique. The wireless communication device may further transmit, via the transceiver, the initial message for the random access procedure using the UL power level. Other aspects, embodiments, and features are also claimed and described.