UE Beam Combination Feedback for Cross-Beam Interference
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR and LTE, face challenges in efficiently determining optimal beam combinations for user equipment (UE) to communicate with multiple transmission reception points (TRPs, leading to potential high cross-beam interference and inefficient communication quality.
Innovation Solution
The UE determines or assists the base station in determining beam combinations by measuring reference signals from multiple TRPs and providing feedback, allowing for the selection of non-interfering beams, thereby enabling improved communication quality and power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam combinations are determined without UE feedback, then device complexity is reduced, but communication quality deteriorates due to high cross-beam interference
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures reference signals from multiple TRPs, determines beam combinations, and provides feedback to the base station. This feedback enables the base station to select beam combinations that avoid cross-beam interference, thereby improving communication quality while managing device complexity through standardized feedback procedures
Solution Approach 2:
The UE performs preliminary measurements of reference signals from multiple TRPs and determines potential beam combinations before actual data transmission. This preliminary action allows the system to pre-identify and avoid harmful beam combinations, improving communication quality in advance while keeping the feedback mechanism manageable
2Reliability
If UE provides detailed beam combination feedback, then communication quality improves, but use of energy increases
Solution Approach 1:
The patent implements partial feedback where the UE reports beam combination information selectively rather than providing complete detailed feedback for all possible beam combinations. This partial action approach maintains communication quality by reporting the most critical beam combination information while reducing UE energy consumption by avoiding exhaustive measurements and reporting of all possible beams
3Device complexity
If beam combinations are selected without interference consideration, then device complexity is reduced, but harmful factors increase due to cross-beam interference
Solution Approach 1:
The UE provides feedback on beam combinations that would result in cross-beam interference, enabling the base station to select beam combinations that avoid such interference. This feedback mechanism identifies and eliminates harmful beam combinations while maintaining manageable device complexity through standardized feedback procedures
Solution Approach 2:
The patent converts the potentially harmful effect of cross-beam interference into a benefit by using UE measurements and feedback to identify which beam combinations cause interference. This information is then used to select beam combinations that avoid interference, turning the awareness of harmful effects into a mechanism for selecting optimal beams
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for user equipment (UE) feedback for beam combinations. An exemplary method generally includes determining at least a first beam combination for at least a first transmission reception point (TRP) and a second TRP, transmitting an indication of the first beam combination to at least one of the first TRP or the second TRP, receiving, based on the indication, configuration information indicating a second beam combination, and communicating with at least the first TRP and the second TRP based on the second beam combination.