Neighbour CQI Verification for Accurate Link Adaptation
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Solution Overview
Problem
Inaccurate Channel Quality Indicator (CQI) reports by wireless devices lead to incorrect modulation scheme assignments, degrading Quality of Service (QoS) and wasting network resources, as there is no standardized method for CQI measurement and reporting.
Innovation Solution
A method and verification node that utilize CQI measurements from neighboring wireless devices with similar characteristics to verify the accuracy of a reported CQI measurement, using a reference CQI measurement report set, and can be implemented in either the wireless device or the RAN node, employing rules-based or machine learning approaches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If CQI measurement is performed by wireless device without standardized method, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the RAN node receives CQI measurements from the wireless device, verifies their accuracy against expected values, and provides feedback signals to the device. This feedback loop enables continuous improvement of measurement accuracy without requiring complex standardized measurement procedures in each device.
Solution Approach 2:
The patent introduces an intermediary verification process at the RAN node that acts as a mediator between the wireless device's CQI measurement and the actual scheduling decisions. The RAN node verifies the measured CQI against expected values and can request re-measurement or use alternative CQI values, thereby ensuring measurement precision without burdening the device with complex measurement standardization.
2Reliability
If link adaptation is used to correct inaccurate CQI reports, then reliability of data transmission is improved, but loss of time increases due to retransmissions
Solution Approach 1:
The patent performs preliminary verification of CQI measurements at the RAN node before using them for scheduling decisions. By verifying the accuracy of CQI reports in advance and correcting potential inaccuracies before data transmission, the system prevents erroneous modulation scheme selections that would lead to retransmissions, thereby reducing time loss while maintaining reliability.
Solution Approach 2:
The patent enables the RAN node to skip using inaccurate CQI reports for scheduling by implementing a verification step that can quickly identify and discard unreliable measurements. This allows the system to rush through the verification process and proceed directly to accurate scheduling decisions, avoiding the time-consuming retransmission cycle.
3Measurement precision
If CQI verification using neighbour device measurements is implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the CQI verification function with the existing RAN node operations by integrating it into the uplink control information processing flow. The verification process combines measurements from multiple wireless devices and uses collective verification, thereby improving measurement precision through aggregation while distributing the complexity across multiple devices rather than concentrating it in one complex verification system.
Data Source
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AI summary
The present application relates to a method for verifying a Channel Quality Indicator, (CQI) measurement performed by a first wireless device in a communication network. The communication network comprises a Radio Access Network (RAN). The method, performed by a verification node, comprises: obtaining a first CQI measurement report comprising a first CQI measurement value of a measurement performed by the first wireless device on for a first downlink channel between a first RAN node and the first wireless device; identifying at least one neighbour wireless device to the first wireless device; obtaining at least one neighbour CQI measurement report from the at least one neighbour wireless device; aggregating the at least one neighbour CQI measurement report into a reference CQI measurement report set; and verifying the first CQI measurement value using the reference CQI measurement report set. The present application also relates to a verification node and a computer program product.