Terminal Beam Management Using Non-Serving Cell SSBs
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Solution Overview
Problem
Existing radio communication systems face high communication overhead during inter-cell mobility due to methods like RRC reconfiguration and PRACH transmission, which hinder efficient DL/UL beam management and increase latency.
Innovation Solution
A terminal that receives a synchronization signal block of a non-serving cell to determine the TCI state for demodulation reference signals of a serving cell, reducing the need for explicit RRC signaling and PRACH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC reconfiguration is used to update TCI state, then TCI state can be updated, but communication overhead increases
Solution Approach 1:
The patent extracts the essential function of TCI state indication from the complex RRC reconfiguration process. By using synchronization signal blocks (SSBs) to carry TCI state information, the patent removes the need for extensive RRC signaling, thereby reducing communication overhead while maintaining TCI state update capability.
Solution Approach 2:
The patent introduces synchronization signal blocks as an intermediary carrier for TCI state information. Instead of directly using RRC reconfiguration to update TCI states, the system uses SSBs as a mediator to convey TCI state indications, which reduces the signaling overhead associated with traditional RRC-based methods.
2Reliability
If PRACH transmission is used to update TCI state, then TCI state can be updated, but communication overhead increases
Solution Approach 1:
The patent extracts the TCI state indication function from the PRACH transmission process. By utilizing synchronization signal blocks separately from PRACH procedures, the patent removes the need to embed TCI state updates within PRACH transmissions, thereby reducing the overhead associated with random access procedures.
3Reliability
If explicit RRC signaling is used for TCI state update, then TCI state can be updated, but latency increases
Solution Approach 1:
The patent applies preliminary action by having the terminal determine TCI states based on synchronization signal blocks before actual data transmission occurs. This allows the terminal to pre-configure the appropriate TCI state for downlink reception, reducing the latency that would otherwise be incurred through explicit RRC signaling during the transmission process.
4Adaptability or versatility
If traditional inter-cell mobility methods are used, then mobility can be achieved, but beam management efficiency decreases
Solution Approach 1:
The patent applies universality by enabling synchronization signal blocks to serve multiple functions simultaneously: cell identification, synchronization, and TCI state indication. This multi-functionality allows the system to achieve inter-cell mobility and beam management using a single unified mechanism, improving efficiency while maintaining adaptability across different mobility scenarios.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a synchronization signal block of a non-serving cell, and a control section that determines a transmission configuration indication (TCI) state of a demodulation reference signal for a physical downlink shared channel or a physical downlink control channel of a serving cell, based on the synchronization signal block of the non-serving cell. According to one aspect of the present disclosure, communication overhead can be suppressed in inter-cell mobility.