MU-MIMO Interference Measurement via Segmented IMRs
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Solution Overview
Problem
Current mobile communication systems, particularly those using Multiple Input Multiple Output (MIMO) transmission in LTE/LTE-A systems, face challenges in accurately measuring MU-MIMO interference, which affects channel status information and system capability, especially in Full Dimension MIMO (FD-MIMO) systems with numerous transmission antennas.
Innovation Solution
The method involves configuring Interference Measurement Resources (IMRs) within User Equipment (UE) to receive signals from other UEs, allowing the UE to measure MU-MIMO interference by distinguishing its own signal from those of other UEs, and transmitting this information back to the eNB, enabling more accurate channel status reporting and link adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MU-MIMO transmission is performed using multiple transmission antennas to increase system capacity, then the number of supported UEs and data transmission rates are improved, but interference measurement accuracy deteriorates because the UE cannot distinguish between signals from other UEs and interference signals
Solution Approach 1:
The patent segments the interference measurement process by introducing two distinct types of IMRs: first type IMRs for measuring interference from adjacent eNBs, and second type IMRs for measuring MU-MIMO interference from the same eNB. This segmentation allows the UE to separately measure different interference sources, resolving the inability to distinguish between interference types in MU-MIMO transmissions.
Solution Approach 2:
The patent introduces an intermediary mechanism where the eNB transmits specific reference signals (CSI-RS) on second type IMRs that are exclusively used for MU-MIMO interference measurement. These intermediary signals enable the UE to identify and measure interference from co-scheduled UEs without confusing them with signals intended for itself, thereby improving measurement accuracy while maintaining high system capacity.
2Ease of operation
If the UE measures interference from all transmitted signals, then the measurement process is simple, but the measured interference includes the UE's own signal which corrupts the channel status information
Solution Approach 1:
The patent applies local quality by assigning different measurement characteristics to different IMR types. Second type IMRs are specifically configured with properties that enable the UE to locally identify and exclude its own transmitted signals from the interference measurement, while first type IMRs maintain simple overall measurement processes for adjacent eNB interference. This localized differentiation resolves the contradiction between measurement simplicity and accuracy.
3Ease of operation
If traditional IMR configuration is used, then the system is simple to operate, but it cannot accurately measure MU-MIMO interference from the same eNB, limiting system capability
Solution Approach 1:
The patent enhances universality by creating a dual-type IMR system that can handle multiple interference measurement scenarios. The eNB can configure first type IMRs for traditional adjacent cell interference measurement and second type IMRs for advanced MU-MIMO interference measurement, making the system adaptable to both conventional and advanced MIMO operations without sacrificing simplicity in basic scenarios.
Data Source
AI summary
One or more embodiments discloses a method of measuring interference by an evolved NodeB and an eNB device. The method includes configuring one or more first type interference measurement resources in a User Equipment (UE). The method also includes transmitting signals for a plurality of UEs within a cell range of the eNB to the one or more first type interference measurement resources. The method also includes receiving channel status information generated in accordance with a signal received in the one or more first type interference measurement resources.