Multi-TRP CSI Reporting With Overlap-Aware NZC Bitmaps
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Solution Overview
Problem
In wireless communications systems with multiple transmission and reception points (TRPs), reporting non-zero coefficient (NZC) bitmaps without considering overlap in frequency domain (FD) bases increases communication overhead due to time delay differences between TRPs.
Innovation Solution
Implement block-based NZC bitmap reporting that exploits overlap in FD bases for different TRPs by separately reporting FD basis selection for each TRP, reducing the bitmap size by indicating the number of selected FD and/or spatial domain (SD) bases per TRP through control signaling or uplink control information (UCI).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate FD basis selection is reported for each TRP, then measurement precision is improved, but communication overhead increases
Solution Approach 1:
The patent merges the reporting of FD basis selection for multiple TRPs by identifying and reporting only the differences (overlaps) between TRPs rather than reporting each TRP's complete basis selection separately. This reduces the total number of bits required in the NZC bitmap while maintaining the precision of channel state information for each TRP.
Solution Approach 2:
The patent applies local quality by tailoring the reporting format to the specific characteristics of each TRP's FD basis selection. By analyzing which bases are common across TRPs and which are unique, the system optimizes the reporting granularity for each TRP individually, reporting detailed information only where necessary and using compressed representations where TRPs share common bases.
2Productivity
If NZC bitmap size is reduced, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the network entity with information about FD basis overlaps between TRPs before the actual channel state information reporting. This allows the UE to use predefined knowledge of which bases are shared across TRPs, simplifying the reporting process and reducing computational complexity at the UE while still achieving compressed bitmap size.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive channel state information (CSI) reference signals (CSI-RS) s from multiple transmission and reception points (TRP) s and may perform measurements on the CSI-RSs to identify suitable configurations for communicating with the TRPs. The UE may also transmit a CSI report to a network entity such that the network entity may identify suitable configurations at the TRPs for communicating with the UE. The CSI report may include a non-zero coefficient (NZC) bitmap based on measurements of the CSI-RSs using frequency domain (FD) and spatial domain (SD) bases associated with each of the TRPs. Described techniques provide for block based NZC bitmap reporting which may take advantage of the partial overlap in FD bases for different TRPs to decrease NZC bitmap size.