Relay Mobility Selection Using Composite Access and Backhaul SNR
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Solution Overview
Problem
In wireless communication networks with relay nodes, determining the overall signal quality for user equipment (UE) mobility procedures, such as cell selection and handover, is complicated by the presence of multiple wireless links, leading to potential suboptimal choices that can result in reduced data throughput and spectral efficiency due to the impact of backhaul link quality on composite signal quality.
Innovation Solution
The proposed solution involves considering the composite, end-to-end signal-to-noise ratios (SNR) for both access and backhaul links when performing mobility procedures, allowing the UE to select the relay node (RN) that offers the best overall signal quality, thereby improving data throughput and spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UE performs mobility procedures based solely on access link quality measurements, then the procedure is simple and fast, but the choice of access node may be suboptimal due to ignoring backhaul link quality
Solution Approach 1:
The patent combines access link quality measurements and backhaul link quality measurements into a unified cell selection and reselection criteria. The UE calculates a composite quality metric that incorporates both the access link (UE to relay node) and backhaul link (relay node to access node) qualities, merging previously separate evaluation dimensions into a single comprehensive decision framework.
Solution Approach 2:
The patent implements preliminary measurement and evaluation of backhaul link quality before the UE finalizes its access node selection. By pre-assessing the backhaul link conditions through measurement reports from the relay node, the system prepares comprehensive quality information in advance, enabling more informed mobility decisions without significant operational complexity increase.
2Reliability
If UE considers both access link quality and backhaul link quality for mobility procedures, then the overall link quality assessment is improved, but the complexity of mobility procedures increases
Solution Approach 1:
The relay node acts as an intermediary that performs backhaul link quality measurements and communicates these results to the UE. Rather than requiring the UE to directly assess backhaul conditions, the relay node mediates this information exchange, simplifying the UE's task while still achieving comprehensive quality assessment. The relay node collects measurement reports and processes backhaul link information before presenting it to the UE for decision-making.
3Speed
If UE selects access node based only on direct signal strength, then the selection process is rapid, but data throughput and spectral efficiency are reduced due to suboptimal backhaul conditions
Solution Approach 1:
The patent implements a feedback mechanism where the relay node provides measurement reports containing backhaul link quality information to the UE. This feedback loop enables the UE to continuously monitor and evaluate the actual performance of the backhaul link, allowing for dynamic adjustments in access node selection that optimize both speed and productivity by considering real-time quality metrics from both access and backhaul segments.
Data Source
AI summary
A system including a processor configured to determine whether or not to perform a mobility procedure based at least in part on a backhaul link quality between a relay node and an access node.