Virtualized DAS Pilot Beacons Power Management

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Solution Overview

Problem

Conventional Distributed Antenna Systems (DAS) consume power inefficiently, experience excessive self-interference, and lack intelligence in signal management, leading to suboptimal performance in cellular broadcast systems.

Innovation Solution

A virtualized DAS network utilizing software configurable radios, carrier-specific transmission, and pilot beacons to optimize signal routing and power management, allowing for intelligent direction of data packets and pilot signals to specific Digital Remote Units based on real-time traffic demands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If all remotes retransmit the entire base station output all of the time, then signal coverage is maintained, but power consumption increases significantly

Engineering Contradiction:

Improvesignal coverageVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system dynamically adjusts remote operation modes based on traffic conditions. Remotes can switch between full retransmission mode (for reliability) and pilot beacon only mode (for energy savings), creating a dynamic adaptation to network demands that resolves the contradiction between signal coverage and power consumption

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters of remotes from continuous full retransmission to selective pilot beacon transmission. By modifying the transmission parameter (full signal vs. pilot only) based on traffic conditions, the system achieves both reliability when needed and energy efficiency when traffic is low

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If multiple operators combine signals at the POI in the analog domain, then system integration is achieved, but self-interference occurs between cellular broadcast systems

Engineering Contradiction:

Improvemulti-operator integrationVSAvoidself-interference

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The system replaces the mechanical/analog signal combining at POI with a digital packet-based routing system. Instead of physically combining analog signals from multiple operators, the system digitally identifies and routes specific carrier packets to appropriate remotes, eliminating self-interference while maintaining multi-operator support

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system segments the combined signal stream into individual carrier packets, each identifiable by its pilot beacon. This segmentation allows the system to process and route specific operator signals separately through digital routing tables, preventing interference between different cellular broadcast systems while maintaining integration

Inventive Principle:

Principle #1Segmentation

3Reliability

If the DAS provides excessive paging signals, then network coverage is maintained, but power consumption increases

Engineering Contradiction:

Improvenetwork coverageVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

Instead of providing full carrier signals continuously (excessive action), the system provides only the necessary pilot beacons for page signals when traffic conditions require it. This partial action approach maintains network coverage functionality while significantly reducing power consumption during low-traffic periods

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS9420628B2Virtualized wireless network with pilot beacons

Publication Date: 2016.08.16 DALI SYST LTD

AI summary

A virtualized DAS network includes one or more digital access units (DAUs) and one or more digital remote units (DRUs) coupled to the one or more DAUs. The virtualized DS network also includes a routing table associated with the one or more DAUs. A signal provided by the one or more DRUs includes one or more carriers and one or more pilot beacons.