Beacon Resource Allocation for Uplink Mobility Tracking

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Solution Overview

Problem

In ultra-dense networks, the current methods for downlink reference signal measurement by User Nodes (UNds) from multiple Access Nodes (ANds) are inefficient due to high power consumption and signaling load, particularly in scenarios requiring timely radio access mobility, where the transmission of uplink reference signals is limited by inflexible periodicity and high bandwidth usage.

Innovation Solution

An Access Node (ANd) allocates a beacon resource pattern to a User Node (UNd) based on detected signal rate limiting parameters, allowing the UNd to autonomously adjust its uplink beacon transmission rate, reducing unnecessary transmissions and optimizing battery consumption by determining the need for beacon transmissions dynamically.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If downlink reference signal measurement by UNd from multiple ANds is implemented, then mobility management is enabled, but power consumption increases and signaling load increases

Engineering Contradiction:

Improvemobility managementVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent inverts the traditional downlink measurement approach by implementing uplink beacon transmission where UNds transmit beacons and ANds measure them. This inversion eliminates the need for UNds to measure and report downlink signals, thereby reducing power consumption and signaling load while maintaining mobility management capability through uplink signal measurement

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If UL beacon transmission with fixed periodicity is implemented, then mobility detection is enabled, but beacon capacity is limited and battery consumption increases

Engineering Contradiction:

Improvemobility detectionVSAvoidbeacon capacity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements dynamic beacon periodicity adjustment where the transmission period is no longer fixed but adapts based on mobility conditions. The ANd determines appropriate periodicity values and signals them to UNds, allowing the system to increase beacon capacity by using longer periods for stationary users while maintaining short periods for mobile users, thereby optimizing both mobility detection and overall beacon capacity

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of beacon transmission periodicity from a fixed value to a dynamically adjustable parameter. The ANd selects from multiple predefined periodicity values (e.g., 10ms, 20ms, 40ms, 80ms, 160ms, 320ms) based on detected mobility conditions, allowing flexible adaptation to different user scenarios and improving overall system efficiency

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If frequent beacon transmission is implemented, then mobility tracking accuracy is improved, but battery consumption increases

Engineering Contradiction:

Improvemobility tracking accuracyVSAvoidbattery consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent changes the transmission periodicity parameter dynamically based on mobility conditions. For stationary or low-mobility users, longer periodicity values are used to reduce battery consumption, while for high-mobility users, shorter periodicity values maintain tracking accuracy. This parameter adaptation resolves the contradiction between measurement precision and energy consumption

Inventive Principle:

Principle #35Parameter changes

4Reliability

If conventional paging is used for UNd tracking, then user location update is enabled, but bandwidth consumption increases

Engineering Contradiction:

Improveuser location updateVSAvoidbandwidth consumption

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent inverts the traditional paging approach by having UNds transmit uplink beacons instead of the network sending downlink pages. This inversion enables the network to detect user presence and location through uplink signal measurement, eliminating the need for bandwidth-intensive paging messages while maintaining user tracking capability

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentEP3275109B1Methods and nodes in a wireless communication network

Publication Date: 2020.10.28 HUAWEI TECH CO LTD

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AI summary

An ANd (110) and method (1500) therein, for allocating a beacon resource pattern to a UNd (120). The ANd (110) is configured to: detect the UNd (120) by receiving an uplink beacon signal from the UNd (120); allocate a beacon resource pattern from a predetermined set of beacon resource patterns, to the detected UNd (120); and signal information about the allocated beacon resource pattern to the UNd (120).