CoMP Signal Quality Measurement Triggering and Reporting
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Solution Overview
Problem
Current received signal quality measurement methods in LTE CoMP scenarios are inadequate for managing inter and intra-cell CSI-RS based measurements, particularly due to the lack of unified solutions, frequent unnecessary serving TP switching, and undefined 'serving' or 'neighbouring' cell references, which hinder efficient CoMP measurement set management and handover processes.
Innovation Solution
An apparatus and method for received signal quality management that defines a signal quality range with a best received signal quality as the upper border, processes reports from a predetermined number of signal originating points within this range, and triggers reports based on changes or periodic updates, using a configurable threshold and hysteresis to avoid frequent changes, allowing for flexible CSI-RS resource configuration across multiple transmission points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional CRS based RSRP/RSRQ measurement events are applied to CSI-RS based CoMP measurement, then existing event triggering mechanisms can be reused, but frequent unnecessary serving TP switching occurs and the measurement set management becomes inefficient
Solution Approach 1:
The patent introduces new triggering parameters specifically designed for CoMP scenarios: a quality threshold parameter and a hysteresis parameter. These parameters control when measurements trigger reporting events, preventing unnecessary switching by requiring significant quality differences before changing serving TP. The hysteresis parameter specifically prevents oscillation by requiring the quality difference to exceed a threshold before triggering a switch.
2Measurement precision
If multiple CSI-RS resources are configured for CoMP measurement set, then comprehensive signal quality coverage is achieved, but the complexity of measurement set management increases
Solution Approach 1:
The patent segments the measurement management into distinct components: CSI-RS resource configuration, measurement triggering conditions, and reporting mechanisms. Each component can be independently configured and managed. The measurement set is divided into individual CSI-RS resources, each with its own measurement and reporting behavior, simplifying the overall management complexity.
Solution Approach 2:
The measurement set is designed to be dynamic and configurable through higher layer signaling. The network can add, remove, or modify CSI-RS resources in the measurement set without requiring system reconfiguration. This dynamic management allows flexible adaptation to changing network conditions while maintaining manageable complexity through standardized procedures.
3Use of energy by moving object
If event triggering is used for measurement reporting, then power consumption is reduced by reporting only on changes, but the definition of 'serving' and 'neighbouring' cells becomes ambiguous for multiple TPs
Solution Approach 1:
The patent creates a universal measurement framework that works for both intra-cell and inter-cell CoMP scenarios. The same CSI-RS based measurement and event triggering mechanism applies regardless of whether TPs have the same or different cell IDs. This eliminates the need for separate reference definitions for serving and neighbouring cells, as the event triggering works uniformly across all configured CSI-RS resources.
Data Source
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AI summary
An apparatus and method provide received signal quality measurement management triggering and reporting. Specifically, a received signal quality range is defined including a best received signal quality as upper border, which is the best received signal quality in a radio resource management measurement among all received signal qualities measured in a received signal quality measurement procedure. The, a report is processed which includes a predetermined number of signal originating points providing a received signal quality at a reference location within the defined received signal quality range.