Dynamic Power Control Parameter Selection for TDD Interference
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Solution Overview
Problem
Current radio communications networks face performance degradation due to interference from neighboring cells, particularly in TDD systems where eNodeB-to-eNodeB interference and adjacent channel interference lead to high interference levels in certain subframes, which existing power control methods struggle to manage effectively.
Innovation Solution
The method involves a user equipment and radio network node system where multiple sets of power control parameters are stored and dynamically indicated to the user equipment, allowing for flexible and efficient transmit power adjustments based on interference levels, enabling optimal power settings even in subframes with high interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional power control methods are used, then power control is simple to implement, but performance degradation occurs due to high interference levels in certain subframes
Solution Approach 1:
The patent applies dynamics by making the power control parameters adjustable and time-varying. Instead of using fixed power control parameters, the system dynamically selects from multiple pre-configured sets of power control parameters based on current interference conditions. This allows the transmit power to be adaptively adjusted in response to changing interference levels across different subframes, resolving the contradiction between maintaining simple implementation and achieving reliable performance under varying interference conditions.
Solution Approach 2:
The patent implements parameter changes by introducing multiple pre-configured sets of power control parameters with different parameter values. The network can indicate to the user equipment which set of parameters to use based on current interference conditions. This enables the system to change power control parameters (such as path-loss compensation factors, target received powers, or maximum transmit powers) according to the specific interference scenario, thereby improving performance without significantly complicating the implementation.
2Adaptability or versatility
If multiple sets of power control parameters are used, then flexibility and performance in high interference subframes improve, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple sets of power control parameters before actual transmission occurs. These parameter sets are prepared in advance and stored in the user equipment, allowing for rapid selection based on current conditions without requiring complex real-time calculations. This approach enhances adaptability while keeping device complexity manageable, as the heavy lifting of parameter optimization is done beforehand rather than in real-time.
Solution Approach 2:
The patent implements segmentation by dividing the power control parameter space into multiple discrete sets. Instead of continuously adjusting parameters, the system segments them into distinct pre-defined sets that can be easily selected and switched between. This segmentation simplifies the control mechanism while maintaining flexibility, as the user equipment only needs to select from a finite number of pre-configured parameter sets rather than managing continuous parameter adjustments.
Data Source
AI summary
Some embodiments herein relate to method in a user equipment for determining a transmit power to be used by the user equipment when transmitting in a radio communications network, which user equipment is served by a radio network node in the radio communications network. The user equipment receives, from the radio network node, an indication indicating a set of power control parameters out of multiple sets of power control parameters, which multiple sets of power control parameters are stored at the user equipment. The user equipment determines a transmit power based on the indicated set of power control parameters.