Multi-TRP PDCCH and CSI-RS Reception Using Unified TCI States
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently managing beam indication overhead in multi-TRP scenarios, particularly in NR Release 17, where unified TCI frameworks are needed for PDCCH and CSI-RS reception to enhance reliability and efficiency.
Innovation Solution
The implementation of a unified TCI framework that allows for the activation of multiple TCI states for PDCCH and CSI-RS reception, with specific rules for determining TCI states based on CORESET IDs and search space associations, enabling efficient beam management across different TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TCI states are activated for PDCCH and CSI-RS reception in multi-TRP scenario, then reliability and efficiency of reception are improved, but beam indication overhead increases
Solution Approach 1:
The patent segments the beam indication process by introducing separate TCI state activation mechanisms for different CORESETs and search spaces. Each CORESET can be independently configured with specific TCI states, allowing granular control over beam indication for different TRPs without requiring global reconfiguration, thus reducing overall overhead while maintaining reliability.
Solution Approach 2:
The patent adds a new dimension to TCI state management by introducing search space-based TCI state indication alongside CORESET-based indication. This multi-dimensional approach allows the system to indicate TCI states through multiple pathways (CORESET ID, search space ID, DCI fields), reducing the burden on any single indication mechanism and overall overhead.
2Loss of information
If unified TCI framework is implemented for single-TRP operation, then beam indication overhead is reduced, but adaptability to multi-TRP scenarios is limited
Solution Approach 1:
The patent creates a universal TCI framework that functions for both single-TRP and multi-TRP scenarios. The same TCI state activation and indication mechanisms work across different TRP configurations, with the added capability to support multiple TCI states per CORESET and search space, providing multi-functionality without requiring separate frameworks.
Solution Approach 2:
The patent introduces dynamic TCI state selection where the system can adaptively choose which TCI states to activate and apply based on the current operational scenario (single-TRP or multi-TRP), the configured CORESETs, and the active search spaces. This dynamic behavior allows the unified framework to efficiently adapt to different TRP scenarios.
Data Source
AI summary
Methods and apparatuses for PDCCH and CSI-RS reception in multi-TRP scenario with unified TCI framework are disclosed. In one embodiment, a UE comprises a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to receive, via the transceiver, a medium access control (MAC) control element (CE) activating at least one Transmission Configuration Indication (TCI) codepoint with two downlink (DL) or joint TCI states; and receive, via the transceiver, a downlink control information (DCI) indicating one TCI codepoint being activated with two DL or joint TCI states if multiple TCI codepoints are activated with DL or joint TCI states.