Handover Data Reliability via Source-to-Target Packet Pre-Send
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Solution Overview
Problem
Current handover procedures in communication systems, particularly in 5G networks, face challenges in ensuring high reliability and low latency due to poor air interface signal quality and delayed data packet transmission during the handover process, which affects the reliability of downlink data packets and increases latency.
Innovation Solution
A communication method where a source access network device sends a data packet to a target access network device and only then sends a handover message to the terminal, ensuring the target device has received the packet, thereby ensuring data transmission reliability and reducing latency by pre-transmitting the packet before the handover command.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the source base station sends downlink data packets to the terminal before successful handover, then data transmission continues, but reliability of data packet reception deteriorates due to poor air interface signal quality
Solution Approach 1:
The source base station pre-sends downlink data packets to the target base station before the terminal successfully hands over. This preliminary action ensures that the target base station already has the data packets ready to transmit immediately after handover, eliminating the gap where data transmission would otherwise be interrupted or lost during the handover transition.
Solution Approach 2:
The target base station acts as an intermediary that receives and buffers downlink data packets from the source base station before the terminal completes handover. This intermediary mechanism allows seamless data packet transfer from source to terminal through the target base station, ensuring both continuity and reliability of data transmission during handover.
2Device complexity
If the source base station waits until after sending handover command to send data packets to target base station, then device complexity is reduced, but handover latency increases
Solution Approach 1:
The source base station performs the action of sending data packets to the target base station in advance, during the handover preparation phase before the handover command is sent to the terminal. This preliminary data packet transmission occurs parallel to the handover signaling, so while the terminal is receiving handover instructions, the data packets are already being transferred to the target base station, eliminating post-handover transmission delays.
3Duration of action of moving object
If data packets are transmitted during handover with poor air interface quality, then data transmission maintains continuity, but data transmission reliability deteriorates
Solution Approach 1:
The target base station serves as a reliable intermediary that receives data packets from the source base station through the backhaul connection (which has high reliability) and then forwards them to the terminal after handover. This separates the data packet transmission path from the poor-quality air interface during handover, ensuring data transmission reliability while maintaining continuity through the intermediary's buffering and forwarding capability.
Data Source
AI summary
Embodiments of this application relate to the field of communications technologies, and in particular, to a communication method and a communications apparatus. The solution includes: sending, by a source access network device, a first data packet of a terminal to a target access network device; and when the source access network device determines that the target access network device has received the first data packet, sending, by the source access network device, a first message to the terminal, where the first message is used to indicate the terminal to hand over to the target access network device.