Wireless UE Coherence Reporting for Reference Signal Codebook Selection
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G NR, lack the capability for user equipment (UE) to independently indicate different levels of coherence among multiple antennas for various reference signal types, limiting the ability to achieve optimal phase coherency in uplink transmissions.
Innovation Solution
The UE is enabled to transmit UE capability information indicating separate levels of coherence for different reference signal types, allowing the network node to schedule uplink communications based on the indicated coherence types, thereby optimizing phase coherency for both time division multiplexed and non-time division multiplexed sounding reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single codebook is used for all reference signal types, then device complexity is reduced, but the ability to optimize phase coherency for different RS types is limited
Solution Approach 1:
The patent segments the codebook management by introducing separate codebooks for different reference signal types (e.g., Type 1 codebook for non-TDM SRS and Type 2 codebook for TDM SRS). This allows the UE to indicate different coherence types independently for each RS type, optimizing phase coherency for each specific signal type while maintaining manageable complexity through structured separation.
Solution Approach 2:
The patent enables dynamic selection of codebooks and coherence types based on the specific reference signal type being transmitted. The UE capability information dynamically indicates which codebook and coherence type to use for each RS type, allowing the system to adapt to different transmission scenarios and optimize performance without requiring a single static codebook configuration.
2Manufacturing precision
If separate codebooks are used for different reference signal types, then phase coherency optimization is improved, but capability information signaling complexity increases
Solution Approach 1:
The patent applies local quality by providing specific coherence type indications for each reference signal type rather than a single global indication. The UE capability information includes separate values indicating the coherence type for non-TDM SRS and TDM SRS independently, allowing optimized phase coherency for each local signal type while maintaining clear and organized capability signaling.
3Productivity
If the UE indicates different coherence types for different RS types, then communication efficiency is enhanced, but the processing complexity at the network node increases
Solution Approach 1:
The patent implements preliminary action by having the UE report its capability information including separate coherence type indications for different reference signal types before actual transmission occurs. The network node receives and stores this capability information in advance, allowing it to efficiently select appropriate codebooks and coherence types for scheduling decisions without requiring complex real-time processing during active communication.
Data Source
AI summary
Aspects described herein relate to transmitting, to a network node, user equipment (UE) capability information including one or more values that independently indicate, for a first reference signal (RS) type, a first codebook supporting a first level of coherency among multiple antennas, and, for a second RS type, a second codebook supporting a second level of coherency among the multiple antennas, and receiving, from the network node, an indication of which of the first codebook or the second codebook, or which of the first RS type or the second RS type, to use in transmitting RS to the network node. Other aspects relate to receiving the UE capability information, and transmitting the indication of which codebook to use.