Inter-cell Coordination Triggering via Combined Signal Metrics
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Solution Overview
Problem
Current LTE standards generate unnecessary measurement reports and may not fully exploit the benefits of inter-cell coordination due to inefficient triggering mechanisms, leading to suboptimal system capacity and coverage.
Innovation Solution
A method and system that determine when to apply inter-cell coordination by calculating a combined metric based on uplink signal quality measurements from both the serving cell and neighboring cells, using a scaling parameter to assess the signal-to-interference ratio, and comparing it to a threshold to decide on the execution of inter-cell coordination procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement reports are triggered based on existing LTE events, then UEs can report signal quality measurements, but unnecessary measurement reports are generated leading to bandwidth consumption and suboptimal system capacity
Solution Approach 1:
The patent introduces a new triggering parameter (combined metric comparing serving cell and neighbor cell signal qualities) to replace or supplement existing LTE event parameters. This parameter change enables more intelligent triggering decisions that account for both serving and interfering cell conditions, reducing unnecessary reports while maintaining reliable quality monitoring.
Solution Approach 2:
The patent implements a feedback mechanism where the network evaluates the combined metric from UE measurements and sends back triggering thresholds or configurations. This closed-loop feedback enables dynamic adjustment of measurement reporting based on actual network conditions, optimizing the balance between measurement reliability and system capacity utilization.
2Reliability
If inter-cell coordination is applied to all UEs, then signal quality may be improved, but bandwidth and processing resources are wasted on UEs that do not benefit
Solution Approach 1:
The patent applies local quality by evaluating inter-cell coordination benefits individually for each UE based on its specific measurement conditions. The combined metric (comparing serving cell RSRP/RSRQ with neighbor cell RSRP/RSRQ) enables cell-specific, UE-specific coordination decisions, ensuring resources are allocated only where locally beneficial rather than applying uniform coordination across all UEs.
Solution Approach 2:
The patent implements partial action by selectively applying inter-cell coordination only to UEs that meet the triggering criteria (when the combined metric indicates potential benefit). This avoids excessive coordination for UEs that would not benefit, optimizing the trade-off between signal quality improvement and resource consumption.
3Measurement precision
If measurement reports are triggered frequently, then signal quality can be monitored accurately, but uplink bandwidth from UE to serving cell is consumed
Solution Approach 1:
The patent changes the triggering parameter from simple event-based thresholds to a combined metric that evaluates both serving cell and neighbor cell signal qualities. This parameter transformation enables more precise monitoring by considering the relative signal strengths, triggering reports only when the differential metric indicates meaningful quality changes, thus reducing redundant uplink transmissions.
Solution Approach 2:
The UE autonomously evaluates the combined metric using locally measured signal qualities and compares it against configured thresholds to self-determine when reporting is necessary. This self-service approach eliminates the need for continuous network-directed triggering, reducing uplink bandwidth consumption while maintaining accurate quality monitoring through event-driven reporting.
Data Source
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AI summary
A method and system for determining whether to apply an inter-cell coordination procedure for a UE in the presence of inter-cell interference from cells, the cells including a serving cell and a plurality of interfering cells, are disclosed. According to one aspect, a method includes receiving measurements of uplink signal quality of the UE from the cells. The method also includes calculating a combined metric based on the received uplink signal quality measurements. The combined metric is compared to a serving cell threshold to determine whether to implement the inter-cell coordination procedure.