Multicast Handover Pre-Configuration for 5G Service Continuity
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Solution Overview
Problem
In 5G networks, there is no effective solution to reduce the multicast service delay caused by handover between base stations, leading to interruptions in service continuity.
Innovation Solution
A communication method where the target access network device receives an identifier from the source network device to determine the transmission mode and sends wireless configuration information to the terminal device before handover, allowing seamless transition and reducing delay by using unicast or multicast modes based on signal measurement and QoS flow information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If wireless configuration information is sent after handover in existing solutions, then the terminal device can receive configuration information, but multicast service delay increases due to handover interruption
Solution Approach 1:
The patent applies preliminary action by having the target access network device send wireless configuration information to the terminal device before handover occurs. This allows the terminal device to pre-configure itself for the target network, eliminating service interruption during handover and reducing multicast service delay while maintaining reliability
2Productivity
If dedicated broadcast channel is used to send air interface configuration information, then terminal devices can obtain configuration information, but spectrum utilization decreases and terminal device requirements increase
Solution Approach 1:
The patent applies universality by enabling the unicast channel to serve dual purposes: it continues to provide unicast services while also transmitting air interface configuration information for multicast services. This eliminates the need for a separate dedicated broadcast channel, improving spectrum utilization and reducing terminal device complexity
Solution Approach 2:
The patent merges the function of sending multicast configuration information with the existing unicast channel infrastructure. By combining these functions, the system eliminates redundant dedicated broadcast channels, thereby improving spectrum utilization and lowering terminal device requirements
3Ease of operation
If handover is performed without pre-configuration, then the handover process is simple, but multicast service interruption occurs during handover
Solution Approach 1:
The patent applies preliminary action by having the target access network device send wireless configuration information to the terminal device before handover occurs. This allows the terminal device to pre-configure itself for the target network, eliminating service interruption during handover and reducing multicast service delay while maintaining reliability
Data Source
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Figure 1c
Figure 2a~2b
AI summary
Embodiments of this application provide a communication method, a device, and a system that are applied to a scenario in which a first terminal device moves from a source access network device to a target access network device, to reduce a multicast service delay caused by handover between access network devices. The communication method includes: The source access network device sends a first identifier to the target access network device, where the first identifier is for identifying a first multicast service. Correspondingly, the target access network device receives the first identifier from the source access network device, and determines a transmission mode for transmitting data of the first multicast service between the target access network device and the first terminal device, where the transmission mode includes a unicast mode or a multicast mode. Then, the target access network device sends wireless configuration information corresponding to the transmission mode to the first terminal device through the source access network device.