Wireless local loop

The wireless local loop technology ( WLL ) is used where the telephone connection via a subscriber line (local loop) is not feasible or too expensive, e.g. B. in sparsely populated rural areas. New network operators who do not have a copper access network are also using this technology.

There are two different procedures:

• Point-to-point radio transmission - the classic directional radio
• Point-to-multipoint radio transmission. Here one base station supplies several participants . A multiple access procedure must be used so that channels are available for all participants at the same time.

The WLL technology requires licensing of the radio frequencies used. WLL is used as a technology for broadband services (comparable to DSL and cable television), although from a technical point of view it can also be used exclusively for telephony. In combination with an alternative, terrestrial backup line, WLL is ideal for a particularly fail-safe connection to the Internet. Under the name WiMAX several were IEEE - standards for wireless local loop radio networks together.

As alternatives to fixed wireless connection of subscribers with rather low traffic volume also are GSM - mobile voice connections and data transmission on 3G mobile radio standards such as UMTS and HSDPA -based connections with cellular gateways as a stationary network termination possible.

Web links

• DSI.net: Nationwide WLL as a dedicated Internet line from 2 to 155 Mbit
• MAXXonair: WiMAX technology in Berlin, Wuppertal, Dresden, Leipzig via WLL frequencies
• Televersa Online: WiMAX technology over WLL frequencies in Eastern Bavaria
• DegNet: WLL as broadband access in Eastern Bavaria (directional radio via WLL)
• QSC AG: Nationwide provider (directional radio via WLL)
• Fact sheet WLL from the Swiss OFCOM
• Infinet Wireless WiMAX, WLL equipment
• AIRDATA WLL frequencies in the 2.6 GHz band - radio networks etc. a. in Stuttgart and Berlin