Uplink Power Control via Pathloss Reference Selection
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE and LTE-Advanced, face inefficiencies in controlling uplink transmit power when coordinated communication between base stations is involved, leading to increased energy consumption and interference.
Innovation Solution
A method for determining uplink transmit power in a user equipment (UE) that involves receiving information from a higher layer, measuring pathloss values of participating base stations, and selecting a reference point based on channel estimation information and pathloss offsets to optimize power decision, thereby minimizing energy consumption and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink transmit power is increased to improve transmission reliability, then transmission reliability is improved, but energy consumption increases
Solution Approach 1:
The patent dynamically changes the uplink transmit power parameter based on measured pathloss values and selected reference points. By adjusting the power level according to actual channel conditions rather than using fixed high power, the system maintains transmission reliability while reducing unnecessary energy consumption.
Solution Approach 2:
The patent implements a feedback mechanism where the UE measures pathloss values from multiple base stations, selects an optimal reference point based on these measurements, and adjusts uplink transmit power accordingly. This closed-loop feedback ensures reliable transmission only when necessary while minimizing energy waste during good channel conditions.
2Reliability
If uplink transmit power is increased to overcome pathloss, then signal quality is improved, but interference to other users increases
Solution Approach 1:
The patent applies local quality by selecting different reference points (base stations) based on their specific pathloss characteristics to the UE. Each UE determines the optimal reference point locally based on its own channel conditions, allowing for localized power optimization that improves signal quality for that specific user while minimizing interference to others in different locations.
Solution Approach 2:
The patent dynamically adjusts the uplink transmit power parameter based on the selected reference point and measured pathloss. By changing the power level to match the specific channel conditions rather than using uniformly high power, the system maintains adequate signal quality while reducing interference generation.
3Adaptability or versatility
If multiple base stations are monitored for pathloss measurement, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments the set of multiple base stations into a selected reference point and other non-selected base stations. The UE monitors pathloss from multiple base stations but only selects one as the reference point for power control calculations. This segmentation maintains adaptability by considering multiple options while reducing complexity by focusing processing on a single selected reference point.
4Productivity
If pathloss measurement and reference point selection are performed, then transmission efficiency is improved, but processing time increases
Solution Approach 1:
The patent performs pathloss measurement and reference point selection in advance before actual uplink transmission. By determining the optimal reference point beforehand based on downlink pathloss measurements, the system prepares the power control parameters in advance, reducing processing time during actual transmission while maintaining high transmission efficiency.
Data Source
AI summary
The present invention relates to a method for determining uplink transmission power of a terminal in a wireless communication system and a device therefore. Specifically, the method for allowing a terminal to determine uplink transmission power in a wireless communication system comprises the steps of: receiving information for determining uplink transmission power from an upper layer; measuring a path loss value for base stations, which participate in cooperate communication, on the basis of information for determining transmission power, on the basis of the received information for determining the transmission power and the measured path loss value, wherein the information for determining the transmission power is information for channel estimation of at least one base station which participates in the cooperative communication.