Target Network Node Rejection Indication for Conditional Handover Protection
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Solution Overview
Problem
In wireless communications networks, especially during conditional handovers, there is a challenge in ensuring that the target cell is protected from being accessed by a UE when the conditions for handover are no longer met, such as increased load, leading to potential network overload and inefficient resource allocation.
Innovation Solution
A method where the UE sends a message to the target network node indicating fulfillment of handover conditions, and in response, the target network node sends a rejection indication to protect the target cell from being accessed, allowing the UE to refrain from accessing the target cell for a configured time or revert to the source cell configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE accesses the target cell when handover conditions are fulfilled, then the handover procedure is executed, but the target cell may become overloaded and network resources are inefficiently allocated
Solution Approach 1:
The target network node preemptively sends a rejection indication to the UE before the UE can access the target cell, preventing potential overload conditions from occurring. This anti-action is taken in advance based on predicted or current load conditions, stopping the harmful effect before it can manifest.
Solution Approach 2:
The target network node monitors its load conditions and provides feedback to the UE through rejection indications when load thresholds are exceeded. This feedback mechanism allows the system to dynamically adjust handover behavior based on current network state, preventing overload while maintaining efficient resource allocation.
2Object-affected harmful factors
If the target network node rejects all handover requests to prevent overload, then the target cell is protected, but legitimate handovers are blocked and network performance deteriorates
Solution Approach 1:
The rejection indication mechanism is dynamic rather than static. The target network node adjusts its acceptance criteria based on current load conditions, allowing legitimate handovers when capacity is available while rejecting requests when overload conditions exist. This dynamic approach optimizes both protection and efficiency.
Solution Approach 2:
The system changes the parameter of handover acceptance by introducing conditional rejection based on load thresholds. When load parameters exceed certain thresholds, the rejection behavior changes from optional to mandatory, allowing the system to adapt its operation mode based on measured parameters.
3Reliability
If the UE continuously attempts to access the target cell, then the UE ensures it can connect, but the target cell experiences increased load and resource waste
Solution Approach 1:
The rejection indication serves as a preliminary anti-action that prevents the UE from wasting energy on futile access attempts. By communicating the rejection status in advance, the system stops the UE from continuing to attempt access, thereby conserving both UE battery and network resources.
Solution Approach 2:
The UE uses the rejection indication information to self-regulate its access behavior. Upon receiving a rejection indication, the UE automatically refrains from further access attempts during the configured time period, making the system self-regulating without requiring continuous network intervention.
Data Source
AI summary
A method performed by a User Equipment (UE) in a wireless communications network is provided. When a condition is fulfilled for accessing a target cell, the UE sends a first message to the target network node. The first message indicates that the condition is fulfilled for accessing the target cell. The UE then obtains as a response to the first message, an indication that an access to the target cell is rejected, which indication protects the target cell to be accessed by the UE.