Terminal Cell Transition Updates Without Handover Commands
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Solution Overview
Problem
In conventional Conditional HO procedures, terminals do not accurately identify whether configuration information on candidate cells needs updating due to changes in the source radio base station configuration, potentially leading to inappropriate cell transitions.
Innovation Solution
The terminal includes a receiving unit to receive configuration information from a transition source cell and a control unit that modifies this information based on modification information, allowing it to perform transitions to transition destination cells without a transition command.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal transitions to the target radio base station based on configuration information without waiting for a handover command, then the instantaneous interruption of a radio link can be avoided, but the terminal may not accurately identify whether configuration information needs to be updated when the source radio base station configuration changes
Solution Approach 1:
The source base station feeds back modification information to the terminal indicating whether configuration information of candidate cells has changed. This feedback mechanism enables the terminal to accurately identify when configuration information needs updating, resolving the contradiction between maintaining radio link continuity and ensuring configuration information accuracy.
Solution Approach 2:
The terminal pre-acquires configuration information of candidate cells from the source base station before handover. This preliminary action allows the terminal to be prepared for potential handover while maintaining the ability to update configuration information when changes occur, thus ensuring both radio link continuity and configuration accuracy.
2Loss of information
If the terminal updates configuration information of candidate cells whenever source base station configuration changes, then configuration information accuracy is maintained, but unnecessary power consumption occurs when updates are not needed
Solution Approach 1:
The source base station provides feedback information that indicates whether configuration information has actually changed. The terminal uses this feedback to determine whether updates are necessary, thereby avoiding unnecessary power consumption while maintaining configuration information accuracy.
Solution Approach 2:
Instead of always updating configuration information (excessive action), the terminal performs updates only when the source base station indicates changes have occurred (partial action). This selective updating approach conserves terminal power while ensuring configuration accuracy is maintained when needed.
3Use of energy by moving object
If the terminal does not update configuration information, then power consumption is reduced, but the terminal cannot perform appropriate cell transition when configuration changes are needed
Solution Approach 1:
The feedback mechanism from the source base station ensures the terminal updates configuration information only when actually needed. This maintains adaptability for appropriate cell transitions while avoiding unnecessary power consumption from redundant updates.
Solution Approach 2:
The terminal autonomously determines whether to update configuration information based on feedback received from the source base station. This self-service approach enables the terminal to balance power consumption and transition appropriateness without continuous network control.
Data Source
AI summary
A terminal 200 includes a receiving unit 220 that receives a plurality of pieces of configuration information of transition destination cells from a gNB 100A by a conditional cell transition in the gNB 100A in which the terminal 200 resides, and a control unit 250 that performs a transition to a transition destination cell based on configuration information of the transition destination cell, without receiving a transition command. When the receiving unit 220 receives modification information indicating whether there is a modification to the configuration information of the transition destination cell, the control unit 250 modifies the configuration information of the transition destination cell based on the modification information.