Terminal Conditional Handover Radio Link Failure Notification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the context of radio communication, when a terminal transitions to a target radio base station without performing a re-establishment procedure during a radio link failure, it is challenging to notify the network of the failure, as conventional methods do not allow for RRC Reestablishment in Conditional HO procedures.
Innovation Solution
A terminal is designed to perform a random access procedure with the target radio base station and transmit a specific message, including radio link failure information, without undergoing a re-establishment procedure, enabling notification of the network about the radio link failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the terminal transitions to the target radio base station without performing a re-establishment procedure during Conditional HO, then the interruption time is reduced and recovery speed is improved, but the ability to notify the network of radio link failure is lost
Solution Approach 1:
The terminal performs the random access procedure and transitions to the target radio base station in advance, before the conventional re-establishment procedure would be executed. This preliminary action reduces interruption time while the invention ensures RLF information is still transmitted through the specific message during this accelerated transition process
Solution Approach 2:
A specific message is introduced as an intermediary carrier to transmit RLF information from the terminal to the target radio base station. This message serves as the mediation mechanism that enables failure notification without requiring the conventional re-establishment procedure, thus resolving the contradiction between speed and information transmission
2Productivity
If the terminal performs a random access procedure and transitions to the target radio base station without re-establishment, then the handover speed is improved, but the conventional method of notifying RLF is eliminated
Solution Approach 1:
The invention changes the parameter of the transition procedure by eliminating the re-establishment step while maintaining the essential function of RLF notification through a specifically designed message format. This parameter change enables faster handover while preserving reliability of failure notification
3Device complexity
If the terminal skips the re-establishment procedure during Conditional HO, then the recovery process is simplified and time is reduced, but the network cannot be informed of the failure
Solution Approach 1:
The invention extracts the essential function of RLF notification from the complex re-establishment procedure. By separating the notification function from the full re-establishment sequence, the terminal can transmit failure information through a simplified specific message, reducing procedural complexity while maintaining information delivery
Data Source
AI summary
A terminal is disclosed including a receiving unit that receives, from a source radio base station, information on a candidate cell and a transition condition to the candidate cell; a control unit that performs a synchronization with the candidate cell based on the transition condition and performs a transition to a target radio base station which configures the information on the candidate cell, without transmitting a re-establishment request message, when a radio link failure is detected; and a transmitting unit that transmits a complete message to the target radio base station when the control unit performs the transition to the target radio base station, wherein the control unit includes, in the complete message, information for notifying the radio link failure.