Uplink Grant Subframe Detection for Handover Interruption
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Solution Overview
Problem
In wireless communication networks, especially in high-density user areas, handover processes between small cells and macro cells often result in radio link failures (RLF) leading to prolonged interruption times due to the need for UE to re-establish radio connections, which can cause data communication disruptions or dropped calls.
Innovation Solution
The solution involves providing UEs with specific information about downlink subframes containing uplink grants beforehand, allowing them to quickly re-establish radio connections without triggering a complete random access procedure, thereby reducing interruption time and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE performs complete random access procedure to re-establish radio connection after handover, then connection reliability is improved, but interruption time increases
Solution Approach 1:
The network pre-configures the UE with information about specific downlink subframes where uplink grants will be transmitted during handover. This preliminary action allows the UE to proactively monitor these designated subframes instead of performing a complete random access procedure, thereby reducing interruption time while maintaining connection reliability through pre-arranged resource allocation.
2Reliability
If UE monitors all downlink subframes for uplink grants during handover, then grant detection reliability is improved, but processing complexity increases
Solution Approach 1:
Instead of uniformly monitoring all downlink subframes, the network provides targeted information about specific subframes where uplink grants will be transmitted. The UE then concentrates its monitoring efforts on these localized, predetermined subframes, reducing processing complexity while maintaining grant detection reliability through focused resource allocation.
3Object-affected harmful factors
If UE performs complete random access procedure, then interference is reduced, but handover speed decreases
Solution Approach 1:
The UE skips the lengthy complete random access procedure by utilizing pre-configured uplink grant information. By rushing through the handover process using predetermined resource allocations and monitoring only specific downlink subframes, the UE achieves faster handover speed while the targeted approach to grant detection minimizes unnecessary interference compared to universal monitoring.
Data Source
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Figure 3
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AI summary
A user equipment (UE) receives a message identifying a subframe containing information relating to an uplink grant to be sent by a target cell.