Interference-Weighted RSRP Beam Selection for 5G UE
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Solution Overview
Problem
Current 5G standards force user equipment (UE) to report the best transmission point (TRP) beams based on Reference Signal Received Power (RSRP), which may not account for inter-cell interference, leading to sub-optimal beam selection and reduced user throughput due to differing interference levels across different antenna arrangements.
Innovation Solution
The UE calculates a final RSRP value for each TRP beam by weighing RSRP measurements from multiple antenna arrangements differently based on their respective inter-cell interference levels, ensuring that beams with higher interference are weighted less, thereby improving the selection of the N best TRP beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE reports the N best TRP beams based on RSRP measurements, then the beam selection follows the standard requirement, but the selected beams may not be optimal with respect to SINR due to differing inter-cell interference levels across antenna arrangements
Solution Approach 1:
The patent changes the parameter used for beam selection from raw RSRP to interference-weighted RSRP. The UE applies weighting factors to RSRP measurements based on measured interference levels, transforming the selection criterion to account for inter-cell interference. This parameter transformation resolves the contradiction by maintaining standard compliance while improving SINR-based optimality.
Solution Approach 2:
The UE performs feedback loops by measuring interference levels on different antenna arrangements and using this information to adjust beam selection. The interference measurements feed back into the RSRP weighting process, creating a closed-loop system that adapts to actual interference conditions and selects beams that are optimal for the current interference environment.
2Adaptability or versatility
If the UE uses multiple antenna arrangements for beam measurement, then more beam options are available, but the complexity of beam selection increases due to different interference levels on each arrangement
Solution Approach 1:
The patent applies local quality by treating each antenna arrangement differently based on its specific interference characteristics. Instead of uniform processing, the UE assigns different weighting factors to RSRP measurements from different antenna arrangements according to their individual interference levels. This localized approach manages complexity by processing each arrangement according to its own characteristics rather than requiring complex cross-arrangement optimization.
Data Source
AI summary
A method for selecting one or more TX beams to identify in a beam report. The method includes a UE obtaining i) a first interference value, 1a, associated with a first antenna arrangement and ii) a second interference value, 1b, associated with a second antenna arrangement. The method also includes the UE obtaining i) a power value, P1a, associated with the first antenna arrangement and with a first TRP TX beam and ii) a power value, P1b, associated with the second antenna arrangement and with the first TRP TX beam. The method further includes the UE determining a first final power value, Pn1, based on 1a and 1b and based on at least one of P1a, and P1b. The method also includes the UE using Pn1 to determine whether or not to include in the beam report an identifier for identifying the first TRP TX beam.