Wireless Device Channel Quality Indicator Reporting
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Solution Overview
Problem
In heterogeneous wireless networks, user equipment (UE) experiences performance degradation due to interference from higher power nodes, which current techniques struggle to efficiently manage, impacting downlink throughput and overall network efficiency.
Innovation Solution
The method involves a wireless device estimating and reporting two types of channel quality indicators (CQIs): one without interference cancellation and one with interference cancellation, allowing the network to adjust scheduling parameters for improved data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heterogeneous networks with higher power nodes are deployed to improve network coverage and capacity, then network capacity and coverage are improved, but interference to user equipment increases causing performance degradation
Solution Approach 1:
The patent converts the harmful interference from higher power nodes into a beneficial signal by having the wireless device cancel the interfering transmission using network assistance information. The interfering signal is reconstructed and subtracted from the received signal, transforming the harmful interference into an opportunity for interference cancellation and improved signal quality.
Solution Approach 2:
The patent introduces network assistance information as an intermediary that enables the wireless device to identify and cancel interfering transmissions. This intermediary information, provided by the network, allows the device to distinguish between desired and interfering signals, facilitating selective interference cancellation without affecting network operations.
2Device complexity
If traditional single CQI reporting is used to maintain simple feedback mechanisms, then feedback complexity is kept low, but scheduling efficiency in heterogeneous networks deteriorates
Solution Approach 1:
The patent segments the single CQI feedback into multiple CQI reports: a first CQI indicating channel quality without interference cancellation and a second CQI indicating channel quality with interference cancellation. This segmentation allows the network to select appropriate scheduling parameters based on whether interference cancellation is applied, improving scheduling efficiency while keeping each individual CQI report simple.
Solution Approach 2:
The patent enables dynamic CQI reporting where the wireless device can adaptively provide different CQI information based on interference conditions. The network can request specific CQI types based on current network state and interference levels, making the feedback mechanism flexible and adaptive to heterogeneous network conditions.
Data Source
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AI summary
The present invention relates to a method for transmitting channel quality indicators, the method being performed in a wireless device served by a first radio network node of a wireless communication network. The wireless device receives a reference signal from the first radio network node and information relating to an interfering transmission of a second radio network node. It estimates a first channel quality based on the reference signal, and a second channel quality based on the reference signal and on the information relating to the interfering transmission, wherein the second channel quality indicates a channel quality for which the interfering transmission has been cancelled. Corresponding first and second channel quality indicators are determined and transmitted to the first radio network node.