Candidate Cell Resource Configuration for Reliable 5G Handover
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks with dense cell deployments, user equipment frequently experiences handover failures due to the inability to receive handover commands in time, leading to issues with accessing secondary cell groups (SCGs) and inefficient utilization of network resources.
Innovation Solution
The method involves configuring candidate cell resource configurations by a target node based on predefined triggering conditions, allowing user equipment to initiate communication processes when specific conditions are met, thereby optimizing handovers and improving communication effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user equipment waits to receive handover command from source base station before switching cells, then the handover procedure follows standard protocol, but the handover fails when user equipment moves to target cell coverage before receiving the command
Solution Approach 1:
The user equipment performs preliminary actions by proactively switching to the target cell and initiating random access procedure before receiving the handover command from the source base station. This preliminary cell switching action allows the UE to be ready in the target cell ahead of time, preventing handover failure when the UE moves out of source cell coverage. The UE monitors for the handover command in the target cell and completes the handover once the command is received.
2Reliability
If the network configures multiple candidate cell resource configurations in advance, then the user equipment can successfully handover when conditions are met, but the network signaling and configuration complexity increases
Solution Approach 1:
Instead of providing uniform resource configurations for all possible target cells, the network configures candidate cell resource configurations with differentiated characteristics based on local conditions. Each candidate cell's resource configuration is tailored to its specific properties (frequency, bandwidth, access parameters), allowing the UE to select the appropriate configuration for the actual target cell. This reduces overall configuration complexity while maintaining handover reliability.
Solution Approach 2:
The network performs preliminary configuration by pre-configuring multiple candidate cell resource configurations in advance before handover is needed. These configurations include various target cell parameters and resource allocations that the UE can select from. This preliminary preparation enables the UE to quickly execute handover to any of the candidate cells without requiring real-time configuration, thus improving handover success rate while managing complexity through advance preparation.
3Reliability
If the user equipment proactively switches to target cell before receiving handover command, then handover failure is prevented, but unauthorized access to target cell resources may occur
Solution Approach 1:
The system implements feedback mechanisms where the target base station monitors the random access procedure initiated by the UE. If the UE switches to the target cell proactively and initiates random access, the target base station can verify whether this is a legitimate handover attempt by checking if the UE's identity and context are valid. The source base station also provides feedback to the target base station about which UEs are expected to handover, enabling the target to distinguish between authorized and unauthorized access attempts.
Solution Approach 2:
The handover command from the source base station acts as an intermediary verification mechanism. Even though the UE switches to the target cell proactively, the handover command serves as official authorization that confirms the handover is legitimate. The target base station uses this handover command as intermediary proof to validate the UE's access rights, preventing unauthorized resource access while allowing proactive cell switching.
Data Source
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AI summary
A wireless communication method, a source node and a target node are provided. The method includes: acquiring at least one candidate cell resource configuration, where the at least one candidate cell resource configuration is configured by a target node based on at least one triggering condition; in a case that the at least one triggering condition has a satisfied triggering condition, determining a candidate cell resource configuration associated with a target triggering condition in the satisfied triggering condition as a target cell resource configuration; and initiating a communication process associated with the target triggering condition, based on the target cell resource configuration.