Carrier Aggregation Power Control for Image Interference
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Solution Overview
Problem
In multi-carrier systems, power imbalances between component carriers can cause image interference, degrading demodulation performance and potentially leading to communication interruptions due to differing carrier coverage areas and power levels.
Innovation Solution
A power control method where user equipment determines the Reference Signal Receiving Power (RSRP) for each carrier, identifies carriers generating image interference, and reports this information to the base station to adjust transmission power, thereby alleviating power imbalances and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier aggregation is performed with component carriers having different coverage areas and power levels, then network coverage and service availability are improved, but image interference occurs due to power imbalance causing demodulation performance degradation
Solution Approach 1:
The patent implements a feedback mechanism where the user equipment measures RSRP values of component carriers, determines power imbalance conditions, and reports this information to the base station. The base station then adjusts transmission power based on this feedback, creating a closed-loop control system that dynamically maintains power balance and prevents image interference while preserving carrier aggregation benefits
Solution Approach 2:
The patent dynamically adjusts the transmission power parameter of component carriers based on measured RSRP values and determined power imbalance conditions. By changing the power parameter adaptively, the system maintains optimal power balance between component carriers, preventing image interference while preserving the versatility of carrier aggregation with different coverage areas
2Reliability
If transmission power of component carriers is increased to improve signal quality, then demodulation performance is improved, but image interference on other component carriers increases
Solution Approach 1:
The patent applies different transmission power levels to different component carriers based on their specific conditions. Instead of using a uniform power level, the system determines power imbalance for each component carrier individually and adjusts power locally, ensuring each carrier has appropriate power for its coverage area while preventing image interference on other carriers
Solution Approach 2:
The system uses RSRP measurement and power imbalance determination as feedback to control transmission power adjustments. This feedback mechanism ensures that power increases for improving demodulation performance are made only when necessary and are balanced against the potential for causing image interference on other carriers
Data Source
AI summary
Power control methods, user equipments, base stations and computer-readable storage media are provided. The method includes: a user equipment determines RSRP corresponding to each of carriers, and determines one or more carriers meeting a first preset condition based on the RSRP corresponding to each of the carriers, where the one or more carriers meeting the first preset condition refer to a carrier generating image interference. Then, the UE reports indication information corresponding to the one or more carriers meeting the first preset condition to a base station to make the base station adjust transmission power of the one or more carriers meeting the first preset condition, so as to alleviate large power difference of each carrier, thus, impact of demodulation performance of some carriers may be reduced, and decline of overall communication performance of carrier aggregation may be alleviated.