Relay Backhaul Failure Handover Timing in Cellular Networks
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Solution Overview
Problem
Existing cellular communication systems face challenges in managing failures in backhaul links between relay nodes, leading to potential communication breakdowns and inefficiencies in recovery processes.
Innovation Solution
A communication control method that includes receiving failure occurrence notifications and initiating timers for recovery, as well as performing conditional handover processes based on these notifications to manage backhaul link failures effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a relay node waits for recovery confirmation before triggering handover, then handover accuracy is improved, but communication continuity deteriorates due to increased downtime
Solution Approach 1:
The system performs preliminary evaluation of trigger conditions for conditional handover when failure occurrence notification is received, even before recovery failure notification is confirmed. This allows the handover process to be prepared in advance, reducing the actual execution time and minimizing communication downtime while maintaining handover accuracy through subsequent confirmation steps.
2Loss of time
If conditional handover is triggered immediately upon failure notification, then communication continuity is improved, but handover accuracy deteriorates due to premature triggering
Solution Approach 1:
The system evaluates trigger conditions preliminarily when failure occurrence notification is received, preparing for potential handover without immediately executing it. This preliminary evaluation maintains handover accuracy by verifying conditions before commitment, while still enabling faster response compared to waiting for full recovery failure confirmation.
Solution Approach 2:
The system uses feedback from the failure occurrence notification to adjust the evaluation of trigger conditions. By continuously monitoring the backhaul link status and incorporating failure notifications into the decision-making process, the system can accurately determine when handover is truly necessary, preventing premature triggering while maintaining responsiveness.
3Measurement precision
If the system evaluates trigger conditions only after receiving recovery failure notification, then handover accuracy is improved, but productivity deteriorates due to delayed response
Solution Approach 1:
The system performs preliminary evaluation of trigger conditions when failure occurrence notification is received, rather than waiting for recovery failure notification. This preliminary action maintains handover accuracy through subsequent confirmation while significantly improving recovery efficiency by reducing the evaluation time and enabling faster handover execution.
4Reliability
If the system starts a timer for recovery waiting, then reliability is improved by ensuring proper recovery attempts, but loss of time increases due to the waiting period
Solution Approach 1:
The system performs preliminary evaluation of handover trigger conditions during the timer waiting period, rather than only after the timer expires. This allows the system to maintain recovery reliability by completing the timer-based recovery attempt, while simultaneously improving response efficiency by evaluating conditions in advance so that handover can be executed immediately upon timer expiration or condition satisfaction.
Data Source
AI summary
A communication control method is used in a cellular communication system. The communication control method includes receiving, by a communication apparatus, from a relay node, a failure occurrence notification indicating occurrence of a failure in a backhaul link between the relay node and a parent node of the relay node, and starting, by the communication apparatus, a timer defining a time to wait for recovery from the failure in response to receiving the failure occurrence notification.