Dual-Cell Multicast Reception During Terminal Handover
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Solution Overview
Problem
Existing methods for receiving multicast broadcast service data in terminal devices experience delays and reliability issues due to the inability to simultaneously maintain connections with both a source and target cell during handovers, leading to interruptions in data reception.
Innovation Solution
A method and apparatus that enable a terminal device to establish and maintain simultaneous connections with both a source cell and a target cell using first indication information, allowing for concurrent data reception from both cells, thereby reducing delays and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device establishes a connection with only one cell at a time during cell handover, then the device complexity is reduced, but the data receiving reliability deteriorates causing service data loss or delays
Solution Approach 1:
The terminal device establishes a target connection with the target cell before releasing the source connection. This preliminary action ensures that the data receiving path is prepared in advance, preventing service data loss during handover. The network device sends handover command information that includes configuration for the target connection, allowing the terminal to set up the new connection while still maintaining the old one, thus ensuring continuous data reception capability.
2Reliability
If the terminal device maintains simultaneous connections with source and target cells during handover, then the data receiving continuity is improved, but the use of energy increases due to maintaining multiple radio interfaces
Solution Approach 1:
The terminal device dynamically manages the dual connections by actively receiving and processing data from both the source cell and target cell simultaneously. The device monitors data reception status from both connections and can switch between them based on which connection provides better service. This dynamic approach ensures continuous data reception while allowing the device to optimize energy usage by being selective about which connection to actively process data from at any given moment.
3Adaptability or versatility
If the terminal device switches data reception from source cell to target cell during handover, then the adaptability to cell changes is improved, but the data receiving delay increases due to connection reconfiguration
Solution Approach 1:
The terminal device receives and configures the target connection in advance before actually needing to switch data reception. The handover command information includes all necessary configuration parameters for the target cell, allowing the terminal to prepare the data receiving path beforehand. This preliminary configuration eliminates the need for time-consuming reconfiguration during the actual handover execution, thus reducing data receiving delay while maintaining high adaptability to cell changes.
4Productivity
If the terminal device receives service data from only one cell, then the device complexity is reduced, but the productivity decreases due to additional data receiving delays during handover
Solution Approach 1:
The terminal device autonomously manages dual connections with source and target cells, independently receiving and processing service data from both connections without requiring complex external coordination. The device monitors data reception from both cells and can self-determine which connection to use for data reception based on current handover status. This self-service capability improves data reception efficiency by ensuring continuous data flow during handover, while the complexity is managed through standardized protocols that automate the dual connection management process.
Data Source
AI summary
A multicast broadcast service data receiving method, including: receiving first indication information sent by a network side, the first indication information being used for establishing a source connection between a terminal device and a source cell and a target connection between the terminal device and a target cell; receiving multicast broadcast service data from the source cell by means of the source connection; and receiving multicast broadcast service data from the target cell by means of the target connection.