Cell Switching Timing Without L3 Signaling
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Solution Overview
Problem
In new communication scenarios, the challenge of triggering cell switching without Layer 3 (L3) signaling is unresolved, as the source base station does not send a switching command and the terminal device does not send a switching complete message to the target base station.
Innovation Solution
A terminal device receives time information indicating the time at which switching without L3 signaling takes effect, and performs the switching procedure based on this information, using timers and indication signals to ensure successful cell switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If switching without L3 signaling is implemented, then switching speed and efficiency are improved, but the ability to correctly trigger and manage the switching procedure deteriorates
Solution Approach 1:
The patent introduces a timer as an intermediary mechanism to manage the switching procedure without L3 signaling. The timer is started based on time information received from the source base station and is used to determine whether switching has been successfully completed. This intermediary timing mechanism provides a reliable way to manage the asynchronous switching process between source and target base stations without requiring L3 signaling exchange.
2Loss of information
If L3 signaling is removed from the switching procedure, then signaling overhead is reduced, but the capability to confirm switching completion deteriorates
Solution Approach 1:
The patent implements a feedback mechanism through the timer system. The source base station sends time information to the terminal device, and both the terminal device and source base station start timers based on this time information. When the timer expires, it provides feedback information about whether switching has been successfully completed. This feedback mechanism allows the system to confirm switching completion without requiring additional L3 signaling overhead.
3Manufacturing precision
If time information is provided for switching trigger, then switching accuracy is improved, but the complexity of timing coordination increases
Solution Approach 1:
The patent applies preliminary action by having the source base station send time information to the terminal device before the actual switching occurs. This time information includes a specific time point when the switching should be triggered. Both the terminal device and source base station start their timers in advance based on this pre-provided time information, ensuring that the switching action occurs at the precise intended moment without requiring complex real-time coordination during the switching event itself.
Data Source
AI summary
A communication method and a communication apparatus. A terminal device receives time information from a first cell, where the time information is usable to indicate first time at which switching without layer 3 (L3) signaling takes effect. The terminal device performs switching from the first cell to a second cell based on the time information. The terminal device triggers, based on the received time information, to start a switching procedure without L3 signaling so that the switching procedure without L3 signaling is correctly started.