Multicast Handover Configuration for Low-Delay 5G Reception
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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, which affects spectrum utilization and terminal device requirements.
Innovation Solution
A communication method where the target access network device receives an identifier from the source access network device to determine the transmission mode for the multicast service, sending wireless configuration information to the terminal device before handover, allowing it to receive data on appropriate wireless resources, and establishing a multicast session if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target access network device sends wireless configuration information to the terminal device after handover, then the terminal device can receive the multicast service, but the multicast service delay caused by handover increases
Solution Approach 1:
The target access network device determines the transmission mode and sends wireless configuration information to the terminal device before handover occurs. This preliminary action allows the terminal device to complete configuration in advance, eliminating the delay that would otherwise occur after handover when configuration is sent.
Solution Approach 2:
The source access network device forwards the first identifier to the target access network device before handover, allowing the target device to prepare the wireless configuration information in advance. This cushioning preparation ensures that when handover occurs, the configuration is already ready to be sent immediately, reducing interruption delay.
2Ease of operation
If a dedicated broadcast channel is used to broadcast air interface configuration information, then the terminal device can obtain configuration information, but spectrum utilization decreases and terminal device requirements increase
Solution Approach 1:
The patent merges the multicast service data transmission with the air interface configuration information delivery by sending both through the same unicast channel. This combination eliminates the need for a separate dedicated broadcast channel, improving spectrum utilization while maintaining ease of configuration delivery.
Solution Approach 2:
The unicast channel is given multiple functions: it simultaneously transmits both the air interface configuration information and the multicast service data. This multi-functionality replaces the traditional single-purpose dedicated broadcast channel, improving spectrum efficiency.
Data Source
AI summary
A communication method, a device, and a system are applied to a scenario in which a first terminal device moves from a source access network device to a target access network device with a multicast service delay caused by handover between access network devices. The communication method includes that 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, and determines a transmission mode including a unicast mode or a multicast mode for transmitting data of the first multicast service between the target access network device and the first terminal device, and sends wireless configuration information corresponding to the transmission mode to the first terminal device through the source access network device.