Wireless Node TCI Update for Multicast Beam Management
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Solution Overview
Problem
In wireless communication systems, particularly in the context of the New Radio (NR) R17 standard, there is a challenge in managing the transmission of control and data channels for multicast and broadcast services, where the same beam is used for both control and data channels, and the Transmission Configuration Indication (TCI) needs to be updated simultaneously for both unicast and multicast traffic, leading to complexity and inefficiency.
Innovation Solution
A method and device for wireless communication that involves receiving and transmitting signaling in specific time-frequency resource sets, using distinct DCI formats and IDs to determine the reference signal resources, allowing for dynamic updating of TCI for unicast and multicast channels, ensuring consistent beam management and reducing hardware complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same CORESET is shared by PDCCH for MBS and PDCCH for unicast, then resource utilization is improved, but beam management complexity increases due to TCI update conflicts
Solution Approach 1:
The patent segments the TCI update mechanism by introducing different RNTI types (first RNTI for unicast, second RNTI for multicast/broadcast) to differentiate between unicast and multicast traffic. This segmentation allows the system to handle TCI updates for shared CORESET resources in a structured manner, reducing beam management complexity while maintaining resource utilization benefits.
Solution Approach 2:
The patent implements dynamic TCI update mechanisms where the TCI state can be updated differently based on the traffic type. For unicast traffic, TCI updates follow one procedure, while for multicast/broadcast traffic, a different update procedure is applied. This dynamic approach resolves the conflict between sharing CORESET resources and managing beam complexity.
2Stability of the object's composition
If TCI is updated simultaneously for unicast and multicast channels, then beam consistency is improved, but system overhead increases
Solution Approach 1:
The patent applies local quality by allowing different TCI update behaviors for different traffic types within the same system. Unicast channels can have TCI updated according to their specific requirements, while multicast/broadcast channels have separate TCI update mechanisms. This localized differentiation maintains beam consistency where needed while reducing overall system overhead.
Solution Approach 2:
The patent uses preliminary action by configuring multiple TCI states in advance for different traffic types. The terminal is pre-configured with TCI states for both unicast and multicast/broadcast traffic, allowing the network to switch between them without requiring simultaneous complex updates, thereby reducing system overhead while maintaining beam consistency.
3Adaptability or versatility
If separate TCI update mechanisms are used for unicast and multicast, then beam management flexibility is improved, but system complexity increases
Solution Approach 1:
The patent implements universality by creating a unified framework that handles both unicast and multicast/broadcast TCI updates through a common mechanism. The same CORESET can serve multiple purposes, and the TCI update system is designed to handle different traffic types through a standardized interface, reducing system complexity while maintaining flexibility.
Solution Approach 2:
The patent introduces an intermediary mechanism through the use of different RNTI types that mediate between the physical layer beam management and the different traffic types. This intermediary layer simplifies the complexity by providing a standardized way to differentiate and handle TCI updates for unicast and multicast/broadcast traffic without requiring separate complex mechanisms.
Data Source
AI summary
The present disclosure provides a method and device in a node used for wireless communications. A node first receives a first signaling in a first time-frequency resource set, the first signaling is used to indicate a first reference signal resource; then receives a second signaling in a second time-frequency resource set; the first time-frequency resource set and the second time-frequency resource set are associated with a candidate resource set, the candidate resource set supports a DCI format scrambled by a first ID, and the second time-frequency resource set is located after the first time-frequency resource set; a demodulation reference signal of a channel occupied by the second signaling is quasi co-located with a target reference signal resource. The application improves the method and device for updating TCI state in the case of M-TRP supporting multicast, so as to optimize the system performance.