Cell Handover Timing Advance Using Downlink Timing Difference
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Solution Overview
Problem
Existing communication systems face challenges in determining the timing advance (TA) of a target cell during cell handover, leading to increased random access and interruption delays.
Innovation Solution
Determine the TA of a target cell based on the downlink timing difference between reference signals of the target and source cells, allowing for a reduced random access and interruption delay during handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal determines TA of the target cell through random access, then the TA can be obtained, but the random access delay and interruption delay increase
Solution Approach 1:
The patent applies preliminary action by having the terminal pre-determine the TA of the target cell based on the TA of the source cell and downlink timing difference before the handover is executed. This allows the TA to be ready in advance, eliminating the need for random access to obtain TA after handover initiation, thereby reducing handover interruption delay while maintaining TA accuracy
2Device complexity
If the terminal uses TA of source cell for target cell access, then the process is simple, but the TA accuracy for target cell is insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the TA parameter through calculation. Specifically, it adjusts the source cell TA based on the downlink timing difference between source and target cells to derive an accurate target cell TA. This mathematical transformation maintains process simplicity while significantly improving TA accuracy for the target cell compared to directly using source cell TA
Data Source
AI summary
Embodiments of this application provide a communication method and an apparatus and system for executing the method. The method may include receiving first information configured to indicate that a first cell and a second cell belong to a same group. The second cell is a current serving cell of a terminal. The method may further include receiving second information configured to indicate that the first cell is a target cell for handover. And, accessing the target cell by using a timing advance (TA) of the target cell determined based on a TA of the second cell and a downlink timing difference between the first cell and the second cell.