TCI State Mapping Across CORESET Pools for Multi-TRP Beam Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing uplink and downlink channels/signals in environments with multiple transmission/reception points (TRPs), leading to ambiguity in beam indication and spatial filter determination, which affects transmission efficiency and reliability.
Innovation Solution
A method and apparatus for transmitting and receiving wireless signals that involve configuring a terminal with a list of Transmission Configuration Indication (TCI) states and Control Resource Sets (CORESETs) to clarify the quasi-co-location relationships for downlink and uplink channels, using Downlink Control Information (DCI) to apply indicated TCI states to specific CORESET pool indexes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs are used to increase transmission capacity and reliability, then the system can accommodate explosive data traffic and improve reliability, but ambiguity in beam indication and spatial filter determination occurs, worsening transmission efficiency
Solution Approach 1:
The patent segments the beam indication process by introducing separate TCI state lists for different CORESET pool indexes. Each CORESET pool (associated with different TRPs) has its own TCI state list, allowing independent beam indication without ambiguity. This segmentation resolves the contradiction by enabling clear beam indication (improving efficiency) while maintaining multi-TRP operation (preserving reliability).
Solution Approach 2:
The patent applies local quality by configuring different TCI state lists for different CORESET pool indexes based on their specific TRP associations. Each CORESET pool receives tailored beam indication parameters appropriate to its local TRP configuration, eliminating cross-TRP beam ambiguity while maintaining overall system reliability through coordinated multi-TRP operation.
2Device complexity
If common beam indication is used to simplify configuration, then device complexity is reduced, but ambiguity arises in multi-TRP scenarios where individual beam control is needed, worsening measurement precision
Solution Approach 1:
The patent introduces dynamic beam indication through DCI-based TCI state selection for specific CORESET pool indexes. The system can dynamically switch between common beam indication (for simplicity) and individual beam indication (for precision) based on operational requirements. This dynamic approach resolves the contradiction by adapting the indication granularity to the specific transmission scenario.
Solution Approach 2:
The patent creates a universal beam indication framework that works for both single-TRP and multi-TRP scenarios. By using CORESET pool index as a discriminator, the same indication mechanism serves dual purposes: common beam indication when a single TCI state list is configured, and individual beam indication when multiple TCI state lists are configured for different CORESET pool indexes. This multi-functionality resolves the contradiction between simplicity and precision.
Data Source
AI summary
Disclosed are a method and apparatus for transmitting and receiving a wireless signal in a wireless communication system. The method according to an embodiment of the present disclosure may comprise the steps of: receiving, from a base station, first configuration information including a list of TCI states, the list of TCI states providing a reference signal for a QCL for a downlink channel and/or a reference for determining an uplink transmission spatial filter for an uplink channel; receiving, from the base station, second configuration information related to a CORESET, a plurality of CORESETs, which have different CORESET full indexes, being configured by the second configuration information; and receiving DCI from the base station.