Indoor Wireless Coverage and Objects Localization: Technologies and Markets
発行: PracTel, Inc.
公安機関や商用ワイヤレスサービスプロバイダー、ワイヤレス通信ユーザーは、信頼性の高い屋内通信をますます必要としています。一方、屋内の無線通信環境では通常・TETRA・P25・LTEに基づく従来の公共安全通信 (PSC) ネットワークを使用できません。建築材料は信号を減衰させるため、通信の信頼性が低下するからです。建物内の衛星信号が弱いため、GPSによるローカリゼーション (測位) 技術も適用できません。そのため、屋外通信チャネルを屋内に拡張するための特別な方法を開発する必要があります。
当レポートでは、屋内用・ワイヤレス通信向けのカバレッジ (受信範囲拡張) およびオブジェクト位置測定 (ローカライゼーション) の市場について分析し、屋内用のワイヤレス通信に関する問題点 - 特に緊急対応通信に求められる条件 - や、主要技術 (スモールセル、DASなど) の現在までの開発・普及動向、具体的事例、関連業界の動静、主な技術規格、といった情報を取りまとめてお届けいたします。
The report addresses specifics of wireless communications and localization technologies that support first responders and other users' activities inside of enclosures such as buildings, tunnels and similar structures. It also addresses related industries, applicable standards and markets.
Increasingly, public safety entities, commercial wireless service providers, and wireless users require reliable indoor communications. For public safety, reliable coverage is often essential throughout a broad jurisdiction, including coverage on-street, in-building, and in-tunnel. In such cases, there is no substitute for a properly designed dedicated mission-critical communications system with sufficient transmit sites to provide the level of signal required for reliable coverage anywhere within the jurisdiction, whether on-street or indoors.
Indoor wireless communications environments usually do not allow using traditional PSC networking based on TETRA, P25 or LTE. Building materials attenuate signals and this makes communications unreliable. Localization based on GPS techniques is becoming also questionable due to weak satellite signals inside of a construction.
All these factors make it necessary to develop special methods to extend outdoor communications channels inside of enclosures. Two such methods are analyzed in this report; and they are based on utilization:
Small Cells base stations are small in size, lightweight and designed to serve up to several tens of users. They may be conveniently spread throughout a building, covering each corridor, hall, corners and so on. The technology relatively recently became commercialized and brought multiple benefits to users.
DAS is used for in-building signals distributions for at least twenty years. The report concentrates on advances in this technology, its specifics and issues.
Standard organizations activities, the in-depth market analysis and survey of the industry are also included in this report.
There are multiple methods suggested for in-building localization of first responders as well as other people or objects in the operational area. They are based on utilization of sensors, RF signatures in a building, amplification of GPS signals and other. The report concentrates on commercialized methods, and provides details of their advantages and issues. The report also addresses marketing aspects of in-building localization; and surveys patents related to indoor localization.
Specifics of indoors communications for the FirstNet - the first national PSC network - are detailed.
The report is written for a wide audience of technical and managerial staff involved in the development of reliable PSC and localization inside buildings and other enclosures.