Coordinated Multipoint CSI Reporting Configuration for Uplink Overhead Reduction

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently adapting link conditions for CoMP transmission hypotheses, leading to excessive uplink overhead and inaccurate CSI reports due to the difficulty in determining relevant interference levels and transmission schemes in coordinated systems.

Innovation Solution

The system configures User Equipment (UE) to receive a message specifying an interference hypothesis and a desired signal hypothesis, allowing it to estimate interference and channel properties, and subsequently transmit CSI reports that match specific CoMP transmission hypotheses, reducing unnecessary reporting and improving link adaptation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If CSI reports are configured for all possible CoMP transmission hypotheses, then the system can support multiple transmission schemes, but uplink overhead and UE processing increase excessively

Engineering Contradiction:

Improvesupport for multiple CoMP transmission schemesVSAvoiduplink overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent segments the set of all possible CoMP transmission hypotheses into multiple subsets, where each subset contains a limited number of hypotheses (e.g., up to 3). The UE is configured to report CSI only for hypotheses within its assigned subset, rather than for all possible hypotheses. This segmentation reduces the total number of CSI reports required while maintaining support for diverse transmission schemes across different UE groups.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by having each UE report CSI for only a subset of relevant CoMP transmission hypotheses rather than all possible hypotheses. The network compensates by configuring multiple UE groups with different subsets, ensuring that collectively all necessary hypotheses are covered. This partial reporting approach significantly reduces per-UE uplink overhead while maintaining overall system versatility.

Inventive Principle:

Principle #16Partial or excessive action

2Adaptability or versatility

If CSI reports are configured for all possible CoMP transmission hypotheses, then the system can support multiple transmission schemes, but UE processing complexity increases

Engineering Contradiction:

Improvesupport for multiple CoMP transmission schemesVSAvoidUE processing

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the computational burden by dividing the set of CoMP transmission hypotheses into subsets assigned to different UE groups. Each UE processes and reports CSI only for its assigned subset, reducing individual UE processing complexity. The network orchestrates multiple UE groups to collectively cover all necessary hypotheses, achieving system-level versatility without excessive per-UE processing requirements.

Inventive Principle:

Principle #1Segmentation

3Measurement precision

If the UE estimates interference for all CoMP transmission hypotheses, then accurate CSI reports can be generated, but measurement and processing time increase

Engineering Contradiction:

ImproveCSI report accuracyVSAvoidmeasurement and processing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent segments the interference estimation task by assigning different subsets of CoMP transmission hypotheses to different UE groups. Each UE estimates interference and generates CSI reports only for its assigned subset, reducing the time required for measurements and processing per UE. The network combines reports from multiple UE groups to achieve comprehensive and accurate CSI for all hypotheses.

Inventive Principle:

Principle #1Segmentation

4Reliability

If multiple CSI reports are transmitted for different hypotheses, then link adaptation can be improved, but network overhead increases

Engineering Contradiction:

Improvelink adaptationVSAvoidnetwork overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent segments the CSI reporting load by distributing different subsets of hypotheses to different UE groups. Each UE transmits fewer CSI reports, reducing individual and aggregate network overhead. The network achieves improved link adaptation by collecting segmented CSI reports from multiple UEs, each covering specific hypotheses, rather than requiring every UE to report on all hypotheses.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10827375B2Configuration of coordinated multipoint transmission hypotheses for channel state information reporting

Publication Date: 2020.11.03 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A system and method for providing an eNodeB with the flexibility to configure a Channel State Information (CSI) report to match a specific Coordinated Multipoint (CoMP) transmission hypothesis, which is a candidate for a downlink transmission to a User Equipment (UE) is disclosed. A UE receives, from the eNodeB, a configuration message that specifies a CSI report. The CSI report is specified by a particular interference hypothesis and a particular desired signal hypothesis corresponding to data transmission over at least one effective channel characterized by a specific reference signal. The UE estimates interference according to the interference hypothesis, and/or estimates at least one effective channel by performing measurements on the specific reference signal, and determines a CSI report based on the interference estimation and on the estimated effective channel. The UE also transmits the CSI report to the eNodeB.