UE PRACH Transmission Power Control via RO Group Selection

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Solution Overview

Problem

There is a need for methods and procedures to control or determine transmission power suitable for non-terrestrial network (NTN) services, particularly considering the maximum transmission power of user equipment (UE).

Innovation Solution

A method for a user equipment (UE) in a wireless communication system involves receiving a configuration related to multiple random access channel occasion (RO) groups, determining an appropriate RO group for physical random access channel (PRACH) transmission based on the UE's maximum transmission power and reference signal received power (RSRP), and determining the transmission power for PRACH transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If transmission power is increased to improve communication performance in NTN services, then communication reliability is improved, but UE maximum transmission power constraints are violated

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidtransmission power

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The patent applies dynamics by making the RO selection adaptable to changing channel conditions and UE power capabilities. The UE dynamically determines which RO group to use based on measured RSRP values and its maximum transmission power, allowing the system to adapt transmission parameters in real-time rather than using fixed configurations.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of RO group selection based on RSRP measurements and UE power constraints. By selecting different RO groups corresponding to different target received power levels, the system adjusts transmission parameters to match both channel conditions and UE capabilities, resolving the contradiction between achieving reliable communication and respecting power constraints.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If RO groups with different target received powers are used to adapt to channel conditions, then communication performance is improved, but system complexity increases

Engineering Contradiction:

Improvecommunication performanceVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the RO resources into multiple RO groups, where each group corresponds to a specific target received power level. This segmentation allows the system to handle different channel conditions and UE power capabilities by selecting the appropriate segment, improving communication performance while keeping the complexity manageable through structured organization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies preliminary action by pre-configuring multiple RO groups with different target received power levels before actual communication occurs. The UE measures RSRP and determines the appropriate RO group in advance, preparing the transmission parameters beforehand to ensure optimal performance without increasing real-time processing complexity.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4572511A1Method, user equipment, processing device, and storage medium for transmitting uplink signal, and method and base station for receiving uplink signal

Publication Date: 2025.06.18 LG ELECTRONICS INC

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AI summary

This BS may provide configurations regarding a plurality of random access channel occasion (RO) groups. This UE may: on the basis of the maximum transmission power of the UE, and an RSRP which has been measured on the basis of a downlink reference signal, determine one of the plurality of RO groups as an RO group for a PRACH transmission; determine one of the ROs within the determined RO group; and perform the PRACH transmission within the determined RO.