Position-Based Receive Filter for Uplink Reference Signals

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Solution Overview

Problem

In wireless communication systems, traditional receive beamforming relies on downlink pilot measurements, which cause overhead and interference, reducing system capacity and accuracy due to pilot pollution, while decreasing reference signal reuse increases overhead, limiting data transmission resources.

Innovation Solution

Network aided receive beamforming uses uplink reference signals to determine user node position and orientation, providing directional parameters for calculating receive filters, allowing for improved signal-to-interference-plus-noise-ratio (SINR) and enabling line-of-sight link adaptation for enhanced modulation and coding schemes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If downlink reference signals are used for receive beamforming, then channel information can be obtained for calculating antenna weights, but overhead increases and system capacity is reduced

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidsystem capacity

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent introduces uplink reference signals as an intermediary resource to obtain channel information indirectly through uplink measurements and position estimation, rather than directly using downlink reference signals. This mediator approach allows the system to achieve channel state information while preserving downlink resources for data transmission, thus resolving the contradiction between measurement accuracy and system capacity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If downlink reference signals are used for receive beamforming, then channel information can be obtained, but pilot pollution and interference increase reducing accuracy

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidpilot pollution

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the traditional approach by using uplink reference signals instead of downlink reference signals to obtain channel information. By measuring uplink signals from the user equipment and estimating position and orientation therefrom, the system avoids the pilot pollution problem that occurs when multiple base stations transmit downlink reference signals in the same resources, thus maintaining measurement accuracy while eliminating interference.

Inventive Principle:

Principle #13The other way round (Inversion)

3Object-affected harmful factors

If reference signal resource reuse is decreased to reduce pilot pollution, then interference is reduced, but overhead caused by reference signals increases

Engineering Contradiction:

Improvepilot pollutionVSAvoidreference signal overhead

Core Design Contradiction:

Object-affected harmful factorsVSQuantity of substance

Solution Approach 1:

The patent makes uplink reference signals serve multiple functions: they are used for channel estimation, position estimation, orientation estimation, and receive beamforming calculation. This multi-functionality allows the system to obtain all necessary information from a single uplink reference signal transmission, eliminating the need for separate downlink reference signals and reducing overall reference signal overhead while avoiding pilot pollution.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Measurement precision

If more physical resources are allocated for reference signaling, then channel information accuracy improves, but physical resources for data transmission decrease

Engineering Contradiction:

Improvechannel information accuracyVSAvoiddata transmission capacity

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent uses uplink reference signals as a mediator to obtain channel information indirectly through uplink measurements and position/orientation estimation, rather than allocating dedicated downlink reference signal resources. This approach allows the system to achieve accurate channel state information while preserving downlink physical resources for data transmission, thus resolving the contradiction between measurement precision and data transmission capacity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10778305B2Method and apparatus for position information based downlink receive filter

Publication Date: 2020.09.15 HUAWEI TECH CO LTD

AI summary

An access node comprises a processor and a transceiver. The transceiver is configured to receive at least one uplink reference signal corresponding to at least one user node. The processor is configured to determine, based on the at least one uplink reference signal, an estimated position of the at least one user node relative to the access node and at least one directional parameter corresponding to the estimated position of the at least one user node relative to the position of the access node. The transceiver is configured to send at least one downlink control information to the at least one user node, the at least one downlink control information including the directional parameters.