Geolocation-Based CSI-RS Resource Configuration

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Solution Overview

Problem

In wireless communication networks, particularly in LTE-Advanced systems, selecting the appropriate CoMP Resource Management Set for channel-state information (CSI) measurements is challenging due to limitations in CSI-RS resources, leading to complexities in configuring relevant transmission points for channel measurements, especially in heterogeneous deployments where many cooperating nodes exceed the allowed CSI-RSRP set size.

Innovation Solution

The initialization of the CoMP Resource Management Set is based on an estimation of the mobile terminal's geographical location, using network positioning techniques such as OTDOA, to select and configure CSI-RS resources for measurement, thereby identifying relevant transmission points and reducing the complexity of CSI feedback.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If CoMP Resource Management Set is initialized without geographical location estimation, then configuration can be simpler, but the system cannot accurately identify relevant transmission points in heterogeneous networks

Engineering Contradiction:

Improveidentification accuracy of transmission pointsVSAvoidcomplexity of CSI feedback configuration

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by performing geographical location estimation before initializing the CoMP Resource Management Set. The network node obtains the mobile terminal's location in advance, then uses this information to pre-identify relevant transmission points and configure appropriate CSI-RS resources, avoiding the need for complex trial-and-error procedures later

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies local quality by tailoring the CoMP Resource Management Set configuration to the specific geographical location of each mobile terminal. Different terminals in different locations receive different configurations of CSI-RS resources that are locally optimized for their specific transmission points, rather than using a uniform configuration for all terminals

Inventive Principle:

Principle #3Local quality

2Productivity

If trial-and-error methods are used to initialize CoMP Resource Management Set, then configuration can be flexible, but lengthy initialization delays occur

Engineering Contradiction:

Improveinitialization speedVSAvoidinitialization delay

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent eliminates initialization delays by performing the identification of relevant transmission points and configuration of CSI-RS resources in advance, based on pre-obtained geographical location information. This preliminary configuration approach removes the need for time-consuming trial-and-error procedures during system operation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses feedback from geographical location estimation to directly determine the appropriate CoMP Resource Management Set configuration. The location information serves as feedback that guides the configuration process, enabling rapid and accurate initialization without iterative trial-and-error methods

Inventive Principle:

Principle #23Feedback

3Reliability

If uplink measurements are used for CoMP Resource Management Set initialization, then existing resources can be utilized, but measurements may be inaccurate or unavailable in certain scenarios

Engineering Contradiction:

Improvereliability of CSI measurementsVSAvoidapplicability across different deployment scenarios

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent introduces geographical location estimation as an intermediary that bridges the gap between available measurement resources and accurate transmission point identification. When uplink measurements are unavailable or inaccurate, the location-based approach serves as an alternative intermediary to achieve the same goal of identifying relevant transmission points

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the basis for initialization from signal measurement parameters (uplink measurements) to geographical parameters (location information). This parameter change enables the system to operate reliably in scenarios where uplink measurements are unavailable or inaccurate, while maintaining adaptability across different deployment scenarios

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP2842236B1Configuring channel-state feedback resources

Publication Date: 2017.03.15 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

The initialization of the CoMP Resource Management Set for a given mobile terminal is based, at least in part, on an estimation of the mobile terminal's geographical location, which can be estimated using network positioning of the mobile terminal. One example method begins with the acquisition (410) by a network node of a geographical position estimate for the mobile terminal of interest. The network node then selects (420) a set of one or more CSI-RS resources for measurement fay the mobile terminal, based on the estimated geographical position of the mobile terminal. Finally, the network node configures the mobile terminal to measure the selected CSI-RS resources by sending (430) control information identifying the set to the mobile terminal.