Uplink Power Control in Dynamic TDD Conflict Sub-frames
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Solution Overview
Problem
In LTE and LTE-Advanced communication systems, dynamic TDD schemes face challenges in maintaining consistent uplink-downlink sub-frame configurations, leading to increased interference in conflict uplink sub-frames, which affects the Signal to Interference and Noise Ratio (SINR) of uplink signals, and there is a lack of mature solutions to adjust uplink power control effectively.
Innovation Solution
A method where a User Equipment (UE) receives adjusted uplink power control parameters from an eNB, calculated using Interference over Thermal (IoT), thermal noise power, and target SINR, to determine the transmitting power of Physical Uplink Shared Channel (PUSCH) and Physical Uplink Control Channel (PUCCH) in conflict uplink sub-frames, ensuring rational power control and interference compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD scheme is used to adapt uplink-downlink configurations to traffic load, then system throughput and peak transmission rate are improved, but interference in conflict uplink sub-frames increases and SINR deteriorates
Solution Approach 1:
The patent applies local quality by differentiating power control parameters between conflict uplink sub-frames and non-conflict uplink sub-frames. Specifically, the eNB configures different P0_NOMINAL_PUSCH, P0_NOMINAL_PUCCH, and alpha values for conflict sub-frames compared to non-conflict sub-frames, allowing localized optimization of uplink power control in interference-prone sub-frames while maintaining standard parameters elsewhere.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting power control parameters (P0_NOMINAL_PUSCH, P0_NOMINAL_PUCCH, alpha) based on whether a sub-frame is identified as a conflict uplink sub-frame. The eNB modifies these parameters specifically for conflict sub-frames to compensate for increased interference, thereby maintaining acceptable SINR levels while enabling dynamic TDD operation.
2Measurement precision
If uplink power control parameters are adjusted for conflict sub-frames, then SINR is improved, but device complexity increases due to additional parameter management
Solution Approach 1:
The patent applies preliminary action by having the eNB pre-configure and indicate power control parameters for conflict uplink sub-frames before the actual transmission occurs. The eNB identifies conflict sub-frames based on TDD configuration and proactively provides appropriate power control parameters through RRC signaling or physical layer indicators, allowing the UE to prepare and apply the correct parameters without real-time computation or complex decision-making.
Solution Approach 2:
The patent uses the eNB as an intermediary that manages the complexity of power control parameter determination. Instead of requiring the UE to independently identify conflict sub-frames and calculate appropriate power levels, the eNB performs this function centrally, identifies conflict sub-frames, determines suitable power control parameters, and communicates them to the UE through established signaling mechanisms, thereby simplifying the UE's task.
Data Source
AI summary
The present invention provides an apparatus and method for uplink signal power control in a dynamic Time Division Duplexing (TDD) cell. According to the method, after accessing a dynamic TDD cell, a User Equipment (UE) receives from an evolved NodeB (eNB) an uplink power control parameter which has been adjusted for a conflict uplink sub-frame.