TCI State Mapping for NR Transmission Reliability
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Solution Overview
Problem
In New Radio (NR) systems, the lack of a TCI state indication field in DCI signaling can lead to inconsistent TCI states between terminal equipment and network devices, resulting in transmission failures.
Innovation Solution
The method involves an apparatus at the terminal equipment side that receives TCI state-related parameters or signaling from the network device, and determines transmission parameters based on TCI state mapping patterns and indications of the presence or absence of the TCI field in DCI signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If DCI signaling does not include a TCI state indication field, then the signaling overhead is reduced, but the TCI states determined by terminal equipment may be inconsistent with those used by the network device, leading to transmission failure
Solution Approach 1:
The network device pre-configures TCI state mapping patterns through RRC signaling, which include multiple TCI states and their mapping relationships. This preliminary configuration enables the terminal to autonomously determine consistent TCI states without requiring real-time indication in DCI signaling, thus reducing signaling overhead while maintaining transmission reliability
Solution Approach 2:
The terminal equipment copies or replicates the network device's TCI state selection by using the pre-configured mapping patterns. Both the network device and terminal use the same mapping logic to select TCI states, ensuring consistency without requiring explicit signaling of the TCI field in DCI
2Reliability
If TCI state mapping pattern parameters are configured to enable flexible TCI state indication, then transmission reliability is improved, but the device complexity increases due to additional configuration and determination processes
Solution Approach 1:
The patent introduces TCI state mapping pattern parameters that define different mapping relationships between DCI fields and TCI states. By changing these parameters through RRC configuration, the system can adapt to different transmission scenarios while maintaining a unified determination mechanism, balancing reliability improvement with controlled complexity
Solution Approach 2:
The TCI state mapping pattern serves multiple functions: it configures the relationship between DCI fields and TCI states, provides the basis for autonomous terminal determination, and ensures consistency between network and terminal. This multi-functional design reduces the need for separate configuration mechanisms, managing complexity while enhancing reliability
Data Source
AI summary
A method and apparatus for determining transmission parameters. The apparatus includes: to receive at least two TCI state related parameters or signaling configured or indicated by a network device; and to determine a transmission parameter of at least one transmission occasion of a transport block according to a related parameter or signaling containing a TCI state mapping pattern, and a parameter or signaling indicating that DCI signaling does not contain a TCI field or a parameter or signaling indicating that DCI signaling contains a TCI field, in the at least two TCI state related parameters or signaling, or determine a transmission parameter of at least one transmission occasion of a transport block according to a related parameter or signaling containing a TCI state mapping pattern, and DCI signaling not containing a TCI field, in the at least two TCI state related parameters or signaling.