Terminal Device Interference Feedback for MU-MIMO Scheduling
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Solution Overview
Problem
In MU-MIMO systems, the existing technologies face challenges in accurately reflecting interference between multiple terminal devices, leading to inaccurate scheduling due to the lack of interference information in channel quality indicators (CQI) collected by the base station.
Innovation Solution
The proposed solution involves an electronic device at the terminal side that measures and feeds back interference information to the base station, allowing for more accurate MU-MIMO scheduling by determining and reporting interference from other terminal devices using a precoded reference signal, enabling the base station to create a more precise interference map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station collects CQI from multiple UEs for MU-MIMO scheduling, then the system capacity increases, but the CQI cannot accurately reflect interference between UEs leading to scheduling inaccuracy
Solution Approach 1:
The patent segments the CQI feedback into two separate components: traditional CQI for channel quality and new interference CQI for inter-UE interference. This segmentation allows the base station to receive both channel quality information and interference information from each UE, enabling more accurate MU-MIMO scheduling by considering both factors separately rather than relying on a single composite metric that cannot capture interference effects.
Solution Approach 2:
The patent implements a feedback mechanism where each UE measures and feeds back interference CQI indicating the interference it experiences from other scheduled UEs. This feedback loop enables the base station to iteratively refine its scheduling decisions by incorporating actual interference measurements from the UEs, thereby improving scheduling accuracy while maintaining high system capacity.
2Productivity
If the base station schedules multiple UEs on the same time-frequency resources, then resource allocation efficiency improves, but interference between UEs increases making accurate scheduling difficult
Solution Approach 1:
The patent uses interference CQI feedback from UEs to create an interference map at the base station. This feedback mechanism allows the base station to identify which UE combinations produce excessive interference and adjust scheduling decisions accordingly, enabling efficient resource allocation while controlling inter-UE interference through informed scheduling choices.
Solution Approach 2:
The patent changes the parameter being measured and reported by UEs from traditional CQI (which only reflects channel quality) to include interference CQI (which reflects both channel quality and inter-UE interference). This parameter change enables the base station to make scheduling decisions that balance resource allocation efficiency with interference management by considering the actual interference environment experienced by each UE.
Data Source
AI summary
The present disclosure relates to an electronic device and communication method. The electronic device used in a first terminal device side of a wireless communication system including: a memory for storing computer instructions; and a processing circuit configured to perform the computer instructions stored thereon for: measuring a first reference signal subject to a first precoding from a base station, wherein a first precoding matrix for the first precoding is determined by the base station based on respective channel states fed back from a plurality of candidate terminal devices, wherein the first terminal device is included in the plurality of candidate terminal devices; determining an interference of other terminal devices in the plurality of candidate terminal devices to the first terminal device based on a result of the measuring and information about the first precoding; and feeding back information indicating the interference to the base station.