Cell Handover Timing Using Delayed Source Disconnection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The handover interruption time in mobile communication networks is prolonged due to the periodicity of synchronization signal block-based measurement timing configuration (SSB-based measurement timing configuration, SMTC) windows and the time for random access between the terminal device and the target base station, leading to data transmission interruptions.
Innovation Solution
A communication method that involves disconnecting the terminal device from the source cell after receiving a reference signal of the target cell, utilizing conditional handover (CHO) configuration, and determining random access and physical uplink shared channel (PUSCH) resources to minimize handover interruption time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal device disconnects from the source cell immediately upon receiving handover instruction, then the handover process is simplified, but the handover interruption time increases due to waiting for reference signal and random access procedures
Solution Approach 1:
The terminal device performs measurements and prepares handover information in advance while maintaining connection to the source cell. The device receives and processes handover instructions, performs reference signal measurements on target cells, and prepares random access resources before actually disconnecting from the source cell, thereby reducing the interruption time when handover is executed
Solution Approach 2:
The terminal device dynamically adjusts its connection state based on handover progress. Instead of a static immediate disconnection, the device maintains the source cell connection during the measurement and preparation phase, then transitions to target cell connection after successful reference signal reception and random access, optimizing the handover timing to minimize interruption
2Productivity
If the periodicity of SMTC window is increased, then the measurement and handover triggering frequency is reduced, but the handover interruption time becomes longer
Solution Approach 1:
The terminal device performs reference signal measurements and prepares handover execution information in advance during the connection to source cell. By having measurements and random access resources prepared beforehand, the actual handover execution can proceed faster, reducing the interruption time even when SMTC periodicity is long
Solution Approach 2:
The invention changes the timing parameter for disconnection from source cell from an immediate action to a delayed action based on reference signal reception timing. This parameter adjustment allows the device to maintain source cell connection longer, utilizing the prepared measurement information to execute handover more efficiently and reduce overall interruption time
Data Source
AI summary
A communication method and apparatus. A terminal device receives first information from a first network device to learn to disconnect, when the terminal device is handed over from a first cell managed by the first network device to a second cell managed by a second network device, a connection between the terminal device and the first cell after a receiving moment of a reference signal of the second cell is reached or after the reference signal of the second cell is received.