Target Cell Beam Indication for Faster Handover Data Transmission
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Solution Overview
Problem
The challenge in 3GPP Radio Access Network (RAN) is to reduce cell handover delay by promptly indicating beam information of a target cell to a terminal during inter-cell mobility, enabling immediate uplink and downlink data transmissions.
Innovation Solution
A network device sends beam indication information, including transmission beams for uplink and downlink data transmissions to a target cell selected based on beam measurement results, using joint or separate beam indications carried in various signaling types, configured independently or jointly with RRC parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If beam information is indicated after cell handover command, then cell handover delay is reduced, but data transmission interruption time increases
Solution Approach 1:
The patent applies preliminary action by indicating beam information of the target cell to the terminal before the actual cell handover is executed. The network device sends beam indication information (such as TCI state) along with the cell handover command, enabling the terminal to prepare the uplink and downlink transmission beams in advance. This allows the terminal to immediately initiate data transmissions with the target cell upon receiving the handover command, reducing both cell handover delay and data transmission interruption time.
2Loss of information
If joint beam indication is used for uplink and downlink, then signaling overhead is reduced, but beam transmission precision may be compromised
Solution Approach 1:
The patent implements dynamics by providing flexible beam indication modes that can adapt to different scenarios. The network device can dynamically select between joint beam indication (where a single TCI state indicates both uplink and downlink beams) and separate beam indication (where independent TCI states are provided for uplink and downlink). This dynamic selection allows the system to optimize between signaling overhead and beam transmission precision based on actual network conditions and terminal capabilities.
Data Source
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AI summary
The present disclosure relates to a beam indication method, device, apparatus, and system, and a storage medium. The method comprises: sending first indication information, the first indication information at least comprising beam information of a target cell, the beam information being used for indicating a transmission beam for uplink and downlink data transmission between a terminal and the target cell, and the target cell being a cell selected from at least one candidate cell according to a beam measurement result In this way, the beam information of the target cell can be indicated to the terminal while handover is triggered, thereby reducing the interruption time of data transmission during cell handover.