http://www.cdg.org/technology/cdma_technology/wll.asp

Wireless Local Loop (WLL)

In many developing countries, there is tremendous demand for new business and residential telephone service. More and more operators are looking to wireless technologies to rapidly provide thousands of new subscribers with high-quality telephone service at a reasonable price.

Existing landline operators can extend their network with WLL.

Cellular operators can capitalize on their current network to deliver residential service with WLL.

New service providers can quickly deploy non-traditional WLL solutions to rapidly meet a community's telephony needs.

The unique features and benefits of CDMA make it an excellent technology choice for fixed wireless telephone systems.

Technical Advantages Turn into Financial Benefits

In a fixed telephony environment, CDMA is estimated to provide up to 15-20 times the capacity of an AMPS cellular system, resulting in the highest capacity cellular-based offering for wireless local loop applications. The key to this increased WLL capacity is that, in a fixed environment, CDMA power control is able to very accurately track required power, thereby resulting in reduced overall transmission power and increased capacity. Subscribers in a fixed environment require less RF power to achieve quality communications, therefore more subscribers can be placed on a CDMA channel.

In addition, CDMA optimizes use of the radio spectrum, which is an increasingly scarce resource worldwide. CDMA's single cell frequency re-use capability and non-contiguous bandwidth requirement, along with its extended coverage range, simplifies RF planning and implementation. This allows an operator to invest in fewer cell sites, with faster deployment, ultimately giving the service provider increased and quicker access to revenues.

The CDMA digital interface also allows for a number of complex and unique features, such as variable rate vocoders; robust error correction; frequency, space and time diversity; and multipath immunity. These features all contribute to improved system and call quality.

WLL Deployments

CDG WLL Initiatives

The CDG supports the deployment of CDMA WLL systems worldwide. To further the efforts of the CDG in assisting operators around the globe, we want to hear from you if you are an operator with an active or planned WLL system.