Terminal TCI Timing for Beam Handover on High-Speed Routes
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Solution Overview
Problem
Existing radio communication systems struggle to effectively control communication in moving objects, such as high-speed trains, due to challenges in beam management and handover processes when using multiple transmission points, particularly in next-generation mobile communication systems like NR.
Innovation Solution
A terminal equipped with a receiving section to measure synchronization signal blocks (SSBs) from transmission points and a control section to determine the transmission configuration indication (TCI) state and applicable duration, enabling appropriate radio communication control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beams are transmitted from multiple transmission points installed in a movement path to enable high-speed mobile communication, then communication coverage and capacity are improved, but beam management complexity and handover control difficulty increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring TCI states and their applicable durations before the terminal actually needs them. The base station provides TCI state information including duration parameters in advance, allowing the terminal to prepare for upcoming beam switches and handovers without real-time decision delays, thus managing complexity while maintaining high communication capacity
Solution Approach 2:
The patent implements dynamics by making the TCI state configuration adaptive and configurable. The base station can dynamically adjust TCI state parameters including applicable durations based on terminal movement speed and channel conditions, allowing the system to flexibly manage beam switching complexity while preserving communication capacity across different scenarios
2Reliability
If beam switching is performed frequently to track moving objects at high speed, then communication stability is improved, but handover latency and control overhead increase
Solution Approach 1:
The patent reduces handover latency by preparing TCI states and their applicable durations in advance. The terminal receives pre-configured beam information that becomes active at predetermined times, eliminating the need for real-time beam selection decisions during handover and thus maintaining communication stability without time loss
Solution Approach 2:
The patent enables the terminal to skip the usual beam selection and measurement procedures by directly applying pre-determined TCI states at specified times. This rushing through of the handover process maintains communication stability for high-speed moving objects while minimizing the time spent on handover procedures
3Measurement precision
If TCI state information is provided for each channel and signal separately, then communication precision is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent applies universality by creating a TCI state configuration mechanism that can serve multiple channels and signals simultaneously. The same TCI state information with applicable duration parameters can be reused across different physical channels and signals, reducing redundant signaling while maintaining precise beam control for each channel
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes a receiving section that receives one or more synchronization signal blocks (SSBs) from one or more transmission points installed in a movement path, and a control section that determines a transmission configuration indication (TCI) state and an applicable duration of the TCI state to be applied to at least one of a channel and a signal received, based on measurement results of the one or more SSBs. According to an aspect of the present disclosure, radio communication in a moving object can be appropriately controlled.