Wireless Device DRS Antenna Port Determination via CRS

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Solution Overview

Problem

In wireless communication systems, existing methods for cell measurement, particularly for data offloading, face challenges in accurately determining signal quality due to the lack of information about the antenna ports used for discovery reference signals (DRS) compared to cell-specific reference signals (CRS), leading to potential erroneous measurements.

Innovation Solution

A method where a wireless device receives a discovery reference signal (DRS) in a designated subframe and determines the antenna port of the DRS based on the antenna ports used by the cell-specific reference signal (CRS) transmitted by the target cell, ensuring accurate measurement by assuming the DRS uses the same or fewer antenna ports as the CRS.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a discovery reference signal (DRS) is used for cell measurement in data offloading, then measurement capability for heterogeneous cells is improved, but measurement accuracy deteriorates due to lack of antenna port information

Engineering Contradiction:

Improvemeasurement capability for heterogeneous cellsVSAvoidsignal quality measurement accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent introduces an intermediary mechanism where the antenna port information of the DRS is derived from the CRS antenna port configuration. The wireless device uses the known CRS antenna ports as a reference to determine the DRS antenna ports, thereby mediating the information gap between DRS and measurement accuracy requirements

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies preliminary action by establishing the antenna port mapping relationship between CRS and DRS before actual measurement occurs. The wireless device pre-determines which antenna ports to use for DRS measurement based on the CRS configuration, ensuring measurement accuracy is prepared in advance rather than discovered during measurement

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If the wireless device assumes DRS uses the same antenna ports as CRS, then measurement accuracy is improved, but device complexity increases due to additional determination logic

Engineering Contradiction:

Improvesignal quality measurement accuracyVSAvoidantenna port determination logic

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies self-service by enabling the wireless device to autonomously determine its own measurement configuration. The device uses its existing knowledge of CRS antenna ports to self-determine the appropriate DRS antenna ports without requiring additional network signaling or external assistance, thereby improving accuracy while minimizing added complexity

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS10154426B2Method for performing measurement and device using same

Publication Date: 2018.12.11 LG ELECTRONICS INC

AI summary

Provided are a method for performing measurement in a wireless communication system and a device using the same. The device receives a discovery reference signal (DRS) in a subframe designated from a target cell, and performs a measurement on the basis of the DRS. An antenna port of the DRS is determined from antenna ports of a cell-specific reference signal (CRS) transmitted by the target cell.