UE Transmit Power Control via HARQ Process Segmentation
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Solution Overview
Problem
In mobile communication systems, particularly in LTE and LTE-Advanced standards, there is a need for efficient control of User Equipment (UE) transmit power to manage resource allocation, minimize interference among communication modules, and comply with Specific Absorption Rate (SAR) requirements, while also optimizing the Hybrid Automatic Repeat reQuest (HARQ) process to prevent resource wastage.
Innovation Solution
A method and apparatus for controlling UE transmit power by determining when multiple HARQ processes are running and reducing the power of those processes that have not experienced previous reductions, ensuring that the total required power does not exceed the maximum allowed, thereby optimizing power distribution across multiple HARQ processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE increases transmit power to maintain communication quality, then the communication reliability is improved, but the SAR requirement violation and interference among communication modules worsen
Solution Approach 1:
The patent segments the transmit power control across multiple HARQ processes. When total required power exceeds maximum power, the system divides the power reduction burden among multiple running HARQ processes rather than affecting a single process, thereby maintaining communication reliability while complying with SAR requirements
Solution Approach 2:
The patent implements dynamic transmit power adjustment based on real-time conditions. The system dynamically determines which HARQ processes to reduce power in, based on whether they have previously experienced power reduction, creating a dynamic power distribution strategy that adapts to changing communication conditions while meeting SAR constraints
2Object-affected harmful factors
If the UE reduces transmit power to meet SAR requirements, then the SAR compliance is improved, but the communication quality and resource allocation efficiency worsen
Solution Approach 1:
The patent segments power reduction across multiple HARQ processes to maintain overall resource allocation efficiency. By distributing the power reduction burden across multiple processes rather than uniformly reducing all power, the system maintains better communication quality and resource utilization while achieving SAR compliance
Solution Approach 2:
The patent changes the power allocation parameters dynamically across different HARQ processes. Instead of uniform power reduction, the system adjusts power parameters selectively based on which processes have previously experienced power reduction, thereby maintaining resource allocation efficiency while meeting SAR requirements
3Ease of operation
If the UE applies uniform power reduction across all HARQ processes, then the implementation simplicity is improved, but the performance degradation worsens
Solution Approach 1:
The patent implements a dynamic power reduction strategy that tracks which HARQ processes have previously experienced power reduction. This dynamic approach selects different processes for power reduction based on their history, improving performance by avoiding repeated power reduction on the same process while maintaining reasonable implementation complexity
Data Source
AI summary
A method and apparatus for controlling transmit power of a User Equipment (UE) in a mobile communication system is provided. The transmit power control method of the present invention includes determining, when the terminal's required transmit power exceeds the terminal's maximum transmit power, whether a plurality of Hybrid Automatic Repeat reQuest (HARQ) processes are running and reducing, when the plurality of HARQ processes are running, a transmit power of at least one of the plurality of HARQ processes which has not experienced transmit power reduction previously. The UE transmit power control method and apparatus of the present invention is advantageous to control the transmit power in transmit power reduction mode.