5G Handover Command with Dynamic System Information Updates
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Solution Overview
Problem
During handover in 5G communications, the condition for applying a conditional handover command may not be met for a long time, leading to changes in system information at candidate base stations, resulting in access failures even when the condition is later met.
Innovation Solution
A communication method where a first device sends a handover request message to a second device, receives an acknowledgement with common system information, and then sends a handover command to a terminal with updated system information, ensuring the terminal receives changed system information through additional messages, allowing timely updates for successful handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal waits for the handover condition to be met before executing handover, then the handover timing is optimized, but the system information may change during the waiting period causing access failure
Solution Approach 1:
The source base station sends the handover command to the terminal in advance, before the handover condition is actually met. The command includes common system information of the target base station and indication information about potential system information changes. The terminal prepares for handover beforehand and can execute it immediately when the condition is met, avoiding the problem of system information changes during the waiting period.
Solution Approach 2:
The patent introduces dynamic indication information that tells the terminal whether the common system information of the target base station has changed. This allows the terminal to adapt its handover execution based on the current state of system information, making the handover process flexible and responsive to changing conditions rather than static.
2Device complexity
If the terminal uses the common system information received in the handover command, then the handover preparation is simplified, but the information may become outdated causing access failure
Solution Approach 1:
The source base station provides feedback to the terminal about whether the common system information of the target base station has changed during the handover preparation period. This feedback mechanism allows the terminal to know whether the information it received is still valid, enabling it to make informed decisions about handover execution without needing to continuously monitor or re-fetch system information.
Solution Approach 2:
The source base station acts as an intermediary that obtains and communicates the current state of the target base station's system information to the terminal. Instead of the terminal directly monitoring the target base station (which would increase complexity), the source base station mediates this information exchange, simplifying the terminal's task while ensuring information accuracy.
Data Source
AI summary
A communication method includes: sending, by a first device, a handover request message to a second device, and receiving a handover acknowledgement message returned by the second device, where the handover acknowledgement message carries common system information of the second device; sending, by the first device, a handover command to a terminal, where the handover command includes the common system information of the second device; sending, by the first device, a second message to the terminal based on a first message, so that the terminal obtains changed communications system information of the second device based on the second message, where the first message is sent by the second device, and the first message is used to indicate a change occurring in the common system information of the second device.