와이브로(WiBro)와 WiMAX

1. 와이브로(WiBro:Wireless Broadband)
    무선으로 이동중에 휴대전화처럼 쉽게 사용할 수 있는 무선광대역 인터넷 서비스기술을 뜻한다. 한국의 통신 업체들이 정부의 지원을 받아 함께 개발하고 있으며, 국제 표준화도 추진중에 있다. 현재 한국내 사업자로 KT와 SK텔레콤이 선정되었고, 2006년 6월 30일 일부지역에서 세계 최초로 상용화 서비스가 시작 되었다.
    처음엔 고속 데이터 통신 기술을 지칭하는 용어로 고안된 것이지만 통신업체에 의해 서비스되는 전국 액세스망으로 선보일 예정으로 기술 이름보다 서비스 명으로 더 잘 알려질 것이다.
    HSDPA 가 다운로드 중심이라면 와이브로는 업로드를 특화한 기술이라 할 수 있다. 인텔에서 추진중인 무선 광대역 인터넷 서비스 WiMAX와도 호환성 개선을 위해 노력중이다.

WiBro is a wireless broadband Internet technology being developed by the Korean telecoms industry. It adapts TDD for duplexing, OFDMA for multiple access and 8.75 MHz as a channel bandwidth. WiBro was devised to overcome the speed limitation of mobile phone (for example CDMA 1x) and to add mobility to broadband Internet (for example ADSL or Wireless LAN). In February 2002, the Korean government allocated 100 MHz of electromagnetic spectrum in the 2.3 – 2.4 GHz band, and in late 2004 WiBro Phase 1 was standardized by the TTA of Korea and in late 2005 ITU reflected WiBro as IEEE 802.16e (mobile WiMAX). WiBro is the service name for mobile WiMAX in Korea. Two Korean Telco (KT, SKT) launched commercial service in June 2006, and the tariff is around 30 US$.

WiBro base stations will offer an aggregate data throughput of 30 to 50 Mbit/s and cover a radius of 1-5 km allowing for the use of portable internet usage.
In detail, it will provide mobility for moving devices up to 120 km/h (74.5 miles/h) compared to Wireless LAN having mobility up to walking speed and Mobile Phone having mobility up to 250 km/h. From testing during the APEC Summit in Busan in late 2005, the actual range and bandwidth were quite a bit lower than these numbers. The technology will also offer Quality of Service. The inclusion of QoS allows for WiBro to stream video content and other loss-sensitive data in a reliable manner. These all appear to be (and may be) the stronger advantages over the fixed WiMAX standard (802.16a). Some Telcos in many countries are trying to commercialize this Mobile WiMAX (or WiBro). For example, TI (Italia), TVA (Brazil), Omnivision (Venezuela), PORTUS (Croatia), andArialink (Michigan) will provide commercial service after test service around 2006-2007. While WiBro is quite exacting in its requirements from spectrum use to equipment design, WiMAX leaves much of this up to the equipment provider while providing enough detail to ensure interoperability between designs.

2. WiMAX(W
orldwide Interoperability for Microwave Access)

WiMAX is defined as Worldwide Interoperability for Microwave Access by the WiMAX Forum, formed in June 2001 to promote conformance and interoperability of the IEEE 802.16 standard, officially known as WirelessMAN. WiMAX aims to provide wireless data over long distances, in a variety of different ways, from point to point links to full mobile cellular type access. In practical terms this enables a user, for example, to browse the Internet ona laptop computer without physically connecting the laptop to a wall jack. The Forum describes WiMAX as “a standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL.”

    The bandwidth and reach of WiMAX make it suitable for the following potential applications:

    □ Connecting Wi-Fi hotspots with each other and to other parts of the Internet.
    □ Providing a wireless alternative to cable and DSL for last mile (last km) broadband access.
    □ Providing high-speed data and telecommunications services.
    □ Providing a diverse source of Internet connectivity as part of a business continuity plan.
        That is, if a business has a fixed and a wireless Internet connection, especially from unrelated providers,
        they are unlikely to be affected by the same service outage.
    □ Providing nomadic connectivity.

출처: 위키백과(와이브로), 위키백과(wibro), 위키백과(wimax)

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