Type-II Port Selection Codebook for Multi-TRP Coherent Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in achieving coherent joint transmission across multiple transmit and receive points (TRPs) with different physical cell identifiers (PCIDs), which affects the decoding performance of downlink channels due to backhaul delays and lack of support for coherent transmission when PCIDs are different.
Innovation Solution
Implementing a Type-II port selection codebook for configuring CSI-RS resources with multiple quasi co-location properties across CSI ports associated with different cells, enabling coherent joint transmission by quasi co-locating CSI-RS resources with synchronization signal blocks (SSBs) and demodulation reference signals (DMRS) ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coherent joint transmission is implemented across multiple TRPs with different PCIDs, then decoding performance of downlink channels is enhanced, but system complexity increases due to the need for Type-II port selection codebook and multi-TRP coordination
Solution Approach 1:
The patent segments the transmission system into multiple independent TRPs (Transmit and Receive Points) with different PCIDs, each capable of transmitting CSI-RS resources independently. This segmentation allows coherent joint transmission across TRPs while managing complexity through modular architecture, where each TRP operates semi-independently but coordinates through the shared codebook structure.
Solution Approach 2:
The Type-II port selection codebook serves multiple functions simultaneously: it enables coherent joint transmission, supports different PCIDs, and provides a unified framework for multi-TRP coordination. This universal codebook structure reduces overall system complexity by consolidating multiple specialized components into a single multi-functional element.
2Adaptability or versatility
If Type-II port selection codebook is used for multi-TRP coherent transmission, then coherent joint transmission capability is enabled, but codebook configuration complexity increases
Solution Approach 1:
The codebook configuration is made dynamic and adaptable to different TRP scenarios. The Type-II port selection codebook can be configured with different sizes and structures depending on the number of TRPs and their PCIDs, allowing the system to adapt to various deployment scenarios without requiring a completely different codebook for each case.
Solution Approach 2:
The patent changes key parameters of the codebook configuration, including codebook size, number of ports, and selection mechanisms, to optimize for coherent joint transmission across multiple TRPs. By adjusting these parameters, the system achieves the desired transmission capability while managing configuration complexity through standardized parameter sets.
3Adaptability or versatility
If CSI-RS resources are quasi co-located with multiple SSBs and DMRS ports across different cells, then multi-TRP coherent transmission is supported, but measurement and processing requirements increase
Solution Approach 1:
The patent introduces CSI-RS resources as intermediary elements that bridge the measurement gap between TRPs and the UE. These CSI-RS resources, when quasi co-located with SSBs and DMRS ports, serve as mediators that enable the UE to measure and report channel state information for multiple TRPs without directly measuring each TRP's raw signal, simplifying the measurement process.
Solution Approach 2:
The system performs preliminary measurements of CSI-RS resources from multiple TRPs before actual data transmission. By measuring the channel state information in advance through these reference signals, the UE can prepare CSI reports that facilitate coherent joint transmission, reducing the complexity of real-time measurement and processing during actual communication.
Data Source
AI summary
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, related to techniques for multiple transmission and reception point (TRP) transmission of channel state information reference signal (CSI-RS) resources. In one aspect, a user equipment (UE) can receive a CSI-RS resource including a first CSI-RS port on a first beam from a first cell of a network entity, the CSI-RS resource including a second CSI-RS port of the second cell on a second beam from a second cell of the network entity. In another aspect, a network entity can transmit, on a first beam from a first cell to a UE, a CSI-RS resource including a first CSI-RS port of the first cell, and transmit, on a second beam from a second cell to the UE, the CSI-RS resource including a second CSI-RS port of the second cell.