Codebook Parameter Segmentation for 5G Multi-TRP Coherent Joint Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G wireless communication systems face challenges in supporting a large number of CSI-RS antenna ports at sub-1 GHz frequencies due to the need for a larger antenna form factor, limiting spectral efficiency and MU-MIMO spatial multiplexing gains.
Innovation Solution
The proposal involves distributing antenna ports across multiple locations and using separate tables for configuring codebook parameter combinations to enhance CSI reporting, optimizing performance and overhead trade-offs for multi-TRP coherent joint transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If antenna ports are distributed across multiple locations for coherent joint transmission, then spectral efficiency and support for more CSI-RS antenna ports are improved, but device complexity and parameter configuration complexity increase
Solution Approach 1:
The codebook parameters are segmented into two separate tables: the first table contains parameters {L1, ..., LNTRP} related to the number of first set of vectors for each TRP group, and the second table contains parameters (pv, β) related to the second set of vectors. This segmentation allows independent optimization and configuration of different parameter sets, reducing the overall configuration complexity while supporting distributed antenna ports across multiple TRPs for coherent joint transmission
Solution Approach 2:
The patent introduces a third table that links the first and second tables through a dimensional mapping relationship. This creates a new configuration dimension where codebook parameters can be selected by combining entries from both tables, enabling flexible parameter combinations without increasing the complexity of individual tables. This dimensional approach allows the system to support a larger number of CSI-RS antenna ports while maintaining manageable configuration overhead
2Adaptability or versatility
If separate tables are used for configuring codebook parameter combinations, then adaptability and optimization of CSI reporting are improved, but information overhead and configuration complexity increase
Solution Approach 1:
The patent merges the configuration functionality of two separate parameter sets into a unified framework through the third linking table. This table establishes correspondence relationships between parameters from the first table ({L1, ..., LNTRP}) and the second table ((pv, β))), allowing the system to adaptively select optimized parameter combinations for CSI reporting while avoiding the need to transmit all possible parameter configurations, thus reducing configuration overhead
Data Source
AI summary
Apparatuses and methods for subset restriction for parameter combination for coherent joint transmission in wireless networks. A method performed by a user equipment includes receiving information about a CSI report. The information includes codebook parameters NL≥1 combinations of values of {L1, . . . , LN<sub2>TRP</sub2>} from a first table and a value of (pv, β) from a second table. {L1, . . . , LN<sub2>TRP</sub2>} is used to determine a number of first set of vectors associated with each of NTRP groups of ports, NTRP is a number ≥1, β is a parameter used to determine a maximum number of coefficients, and pv are parameters used to determine a second set of vectors. The method further includes determining the CSI report based on the information and transmitting the CSI report. The codebook parameters are configured based on a third table that links the first and second tables.