Early Beam Management for Low-Interruption Wireless Handover
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Solution Overview
Problem
Existing low-layer triggered mobility methods in wireless communication systems require time for beam management procedures after cell switching, leading to data interruption and quality degradation during handover, especially in inter-CU scenarios.
Innovation Solution
Implement early beam management techniques that involve signal strength measurement, CSI-RS and SRS transmission, and joint UL/DL TCI state configuration to enable rapid DL and UL beam management before cell switching, allowing seamless data transmission and reception with the target cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam management procedures are performed after cell switching in low-layer triggered mobility method, then the terminal can establish connection with target cell, but data interruption and quality degradation occur during handover
Solution Approach 1:
The patent performs beam management procedures (DL beam management using CSI-RS and UL beam management using SRS) with the target cell before cell switching is executed. This preliminary action establishes the beam connection in advance, so when handover occurs, data transmission can continue without interruption or quality degradation.
2Loss of time
If early beam management is performed before cell switching, then data interruption is reduced, but additional signaling and measurement procedures are required
Solution Approach 1:
The source base station acts as an intermediary that coordinates the early beam management process. It provides configuration information for CSI-RS and SRS to the terminal, collects measurement results, and facilitates the beam management procedures with the target cell, thereby managing the complexity centrally rather than requiring direct complex interactions between terminal and target cell.
3Productivity
If joint UL/DL TCI state configuration is used, then beam management efficiency is improved, but configuration and coordination between base stations becomes more complex
Solution Approach 1:
The patent combines uplink and downlink beam management into a unified joint UL/DL TCI state configuration. By merging the configuration of transmission configuration indicators for both uplink and downlink, the system improves beam management efficiency and reduces the number of separate procedures, while the source base station coordinates this unified configuration to manage the complexity.
Data Source
AI summary
The present disclosure relates to an early beam management technique in a communication system. According to the present disclosure, a method of a terminal may comprise: receiving at least one signal from at least one candidate base station; transmitting a first signal strength measurement result for the at least one signal to a source base station; performing early downlink (DL) beam management for one candidate base station selected among the at least one candidate base station based on the first signal strength measurement result; and performing uplink (UL) beam management with the one candidate base station.