Uplink Power Control for Multiple Timing Alignment Groups
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Solution Overview
Problem
In wireless communication systems supporting carrier aggregation, there is a need for effective uplink power control, particularly in scenarios involving multiple timing adjustments, to ensure efficient transmission across various channels and cells.
Innovation Solution
A method for controlling uplink transmit power in a mobile station that considers timing alignment groups, determining power levels for channels like PUCCH, PUSCH, PRACH, and SRS, with specific equations for power calculation based on maximum transmit power, pathloss estimation, and other parameters, ensuring prioritization and efficient power distribution across different TA groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple channels (PUCCH, PUSCH, PRACH, SRS) are simultaneously transmitted in the same subframe across multiple TA groups, then the uplink transmission capacity and reliability are improved, but the power control complexity and difficulty of power distribution increase
Solution Approach 1:
The patent segments the uplink channels into different priority levels (PRACH highest, then PUCCH, then PUSCH with UCI, then PUSCH without UCI, then SRS lowest) and divides power allocation into sequential stages. This segmentation allows the mobile station to systematically distribute limited power resources across multiple simultaneously transmitted channels in multiple TA groups, resolving the power control complexity while maintaining transmission reliability.
Solution Approach 2:
The patent applies local quality by allocating different power levels to different channels based on their specific requirements and priorities. Each channel receives power according to its importance (e.g., PRACH gets highest power for random access success, PUCCH gets high power for control information reliability), allowing optimized power distribution across the heterogeneous channel types being simultaneously transmitted.
2Reliability
If transmit power is increased to ensure reliable communication across multiple TA groups, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies partial action by allocating power selectively to channels based on their priority and current transmission needs rather than maximizing power for all channels simultaneously. The mobile station calculates required power for each channel and allocates only the necessary amount, avoiding excessive energy consumption while maintaining adequate communication reliability across multiple TA groups.
Solution Approach 2:
The patent dynamically adjusts power allocation parameters based on channel conditions, priority levels, and available power resources. By changing power parameters adaptively rather than using fixed high power levels, the system maintains communication reliability while optimizing energy consumption across the multiple simultaneously transmitted channels.
Data Source
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AI summary
Disclosed are a terminal device for controlling uplink signal transmission power, and a method therefore. The present invention relates to a method and terminal device for controlling uplink transmission power, wherein the method, in which a terminal that communicates with cells of each timing alignment (TA) group controls uplink transmission power in the event a plurality of TA groups including one or more cells exists in a wireless communication system, comprises: a step of determining the uplink transmission power for at least one channel in the event at least two channels from among a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH) including a plurality of pieces of uplink control information (UCI), a PUSCH including no UCI, a physical random access channel (PRACH), and a sounding reference signal (SRS) are simultaneously transmitted in the same subframe in each specific cell of the plurality of TA groups; and a step of transmitting said at least one channel with the determined uplink transmission power, wherein said uplink transmission power is determined in consideration of a TA group index.