Conditional Access Terminal Handover Delay Mechanism
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Solution Overview
Problem
In wireless communication networks, handover procedures often result in radio link failures due to delayed identification of stronger target access points, leading to signal deterioration and failed handovers, especially when neighbor access points are not prepared in advance.
Innovation Solution
Implementing target-specific thresholds for access terminals to declare radio link failures and performing early handover operations with delayed initiation, allowing for preparation of target access points before signal conditions deteriorate, thereby reducing handover-related failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access terminal waits for the target access point signal to be stronger than the serving access point before initiating handover, then the handover reliability improves, but the handover delay increases and radio link failure may occur
Solution Approach 1:
The network performs backhaul communication with the target access point to negotiate resources and prepare for handover before the access terminal actually initiates the handover. This preliminary preparation ensures that when handover is triggered, the target access point is already ready to receive the access terminal, reducing handover delay and preventing radio link failure.
2Reliability
If the access terminal uses conventional measurement thresholds to trigger handover, then the handover timing is delayed until signal conditions are clear, but the serving access point signal may already be too weak for reliable communication
Solution Approach 1:
The network proactively identifies potential target access points and performs resource negotiation in advance based on predicted handover needs, rather than waiting for conventional signal strength thresholds to be met. This allows handover to be initiated earlier while the serving access point signal is still sufficient for reliable communication.
Solution Approach 2:
The system prepares buffer resources at the target access point before handover is actually needed, creating a cushion that ensures immediate availability of resources when handover occurs, preventing communication interruptions even if signal conditions deteriorate rapidly.
3Productivity
If the network prepares target access points in advance, then the handover speed improves, but the network complexity and resource management overhead increase
Solution Approach 1:
The network performs preliminary resource negotiation and preparation selectively for specific target access points based on predicted handover scenarios, rather than universally preparing all possible targets. This localized approach optimizes handover speed for critical scenarios while minimizing unnecessary network complexity and resource overhead.
Data Source
AI summary
The number of handover-related failures that occur in a communication system may be reduced by taking target access point conditions into account when declaring radio link failure and/or by delaying certain handover operations. In some aspects, criteria for radio link failure detection and access terminal-controlled mobility may take into account access point parameters related to neighboring cells that may be available as mobility targets. For example, filtering mechanisms for detecting radio link failure based on radio layer problem reports may also take into account the availability of various neighbor access points and their measured signal strengths. In addition, a handover command may be sent earlier than in conventional systems (e.g., the handover command may be sent even though the target access point is weaker than the source access point) and include an indication that instructs the access terminal to delay handover until a specified condition is met. For example, handover may be delayed until the target access point becomes stronger than the source access point.