mTRP Beam Determination Using Default Beams for Repeated PDSCH
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Solution Overview
Problem
The existing 5G and 6G communication networks face challenges in beam determination, particularly in multiple transmission and reception point (mTRP) environments, where data transmission efficiency is hindered by ambiguity in reception beam selection during data transmission.
Innovation Solution
A method and apparatus for beam determination in a communication system, involving user equipment (UE) and base stations, utilize higher layer signaling for repeated data transmission, downlink control information (DCI) for beam configuration, and default beam usage conditions to ensure consistent reception beam selection for physical downlink shared channels (PDSCHs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If beam indication information is used to dynamically change reception beams for PDSCH occasions, then data transmission adaptability is improved, but beam determination ambiguity occurs when multiple PDSCH occasions carry the same data with different beams
Solution Approach 1:
The patent introduces a default beam configuration that is pre-established before PDSCH reception. When beam indication information is not received or is invalid for a PDSCH occasion, the UE falls back to using the default beam. This preliminary action ensures that beam determination is always possible, eliminating ambiguity in repeated transmissions while still allowing dynamic beam changes when conditions permit.
Solution Approach 2:
The patent introduces a default beam as an intermediary between the UE and the network for beam determination. This default beam acts as a mediator that resolves the conflict between dynamic beam adaptation and reliable beam determination. The default beam provides a stable reference that can be overridden by beam indication information when available, ensuring both adaptability and reliability.
2Adaptability or versatility
If multiple TCI state lists are configured for different TRPs, then multi-TRP transmission capability is improved, but complexity of beam management increases
Solution Approach 1:
The patent segments the beam management process by introducing separate TCI state lists for different TRPs. Each TRP can be associated with its own TCI state list, allowing independent beam management for each transmission point. This segmentation reduces the complexity of managing beams across multiple TRPs by organizing them into distinct, manageable groups.
Solution Approach 2:
The patent pre-configures multiple TCI state lists through higher layer signaling before actual PDSCH reception. This preliminary configuration allows the UE to have multiple beam options ready in advance, reducing the real-time complexity of beam selection. The UE can efficiently manage beams by referring to pre-established TCI state lists rather than determining beams dynamically during reception.
Data Source
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AI summary
A method of a UE according to an embodiment of the present disclosure may comprise the steps of: receiving repetitive transmission information of identical data through higher layer signaling; receiving first DCI from a first TRP; when beam indication information included in the first DCI indicates a reception beam change, configuring a first reception beam for receiving PDSCHs for a pre-configured first time; when at least one PDSCH occasion based on the repetitive transmission information exists within the first time, determining whether a default beam use condition is satisfied; and when the default beam use condition is satisfied, receiving PDSCHs from the first TRP by using a default beam on the at least one PDSCH occasion based on the repetitive transmission information.