CoMP CSI Feedback Constraint for UE Computational Burden

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Solution Overview

Problem

The increased number of nonzero power CSI-IM resources in 3GPP LTE-A standards places a high computational burden on user equipment (UE) when processing CSI reports for CoMP schemes, particularly when dealing with multiple transmission points, leading to inefficiencies in interference measurement and channel state feedback.

Innovation Solution

Constraining CSI feedback by limiting the number of CSI reports to only two transmission points, reusing a given rank indicator for each report, and increasing processing time to generate reports, thereby reducing the computational workload on the UE.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the number of nonzero power CSI-IM resources is increased to support more transmission points in CoMP schemes, then the coverage area and coordination capability are improved, but the computational burden on user equipment increases significantly

Engineering Contradiction:

Improvecoverage areaVSAvoidcomputational burden on UE

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The patent extracts and isolates the most critical interference measurement resources by limiting CSI-IM resources to at most two nonzero power resources. This selective extraction reduces the computational burden on UE while maintaining effective CoMP operation by focusing only on the most significant interference sources rather than processing all possible transmission points

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the parameter of CSI-IM resource configuration by imposing constraints on the number of nonzero power CSI-IM resources (limiting to at most two). This parameter change transforms the system from supporting an unlimited number of transmission points to a constrained configuration that balances coverage capability with UE processing capacity

Inventive Principle:

Principle #35Parameter changes

2Loss of time

If CSI feedback is constrained to limit the number of reports, then the processing time and computational complexity are reduced, but the measurement precision and feedback accuracy may be degraded

Engineering Contradiction:

Improveprocessing timeVSAvoidfeedback accuracy

Core Design Contradiction:

Loss of timeVSMeasurement precision

Solution Approach 1:

The patent applies partial action by configuring at most two nonzero power CSI-IM resources instead of supporting all possible transmission points. This partial measurement approach reduces processing time and computational complexity while maintaining sufficient feedback accuracy for effective CoMP operation by focusing on the most critical interference sources

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP2880777B1Techniques for sending or receiving channel state information reports associated with a coordinated multi-point scheme

Publication Date: 2019.10.30 INTEL CORP

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AI summary

Examples are disclosed for sending or receiving channel state information (CSI) reports associated with coordinated multi-point (CoMP) schemes. The examples include user equipment (UE) constraining CSI feedback to one or more transmission points implementing a CoMP scheme with the UE. The examples also include a transmission point such as an evolved node B (eNB) triggering CSI feedback and receiving a CSI report in response to the trigger. The CSI report generated based on the UE constraining CSI feedback. Constraining CSI feedback may include the UE generating fewer CSI reports, reusing information between CSI reports or increasing an amount of time allowed for processing and generating CSI reports. Other examples are described and claimed.