Adaptive Radio Resource Management | Ubiquisys Femtocell Technology

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Femtocell Technology: Adaptive Radio Resource Management

Ubiquisys is the only femtocell vendor to have deployed femtocells specifically designed to operate successfully when sharing the same frequencies as the macro network (often described as “shared spectrum” deployment).

All femtocells feature some form of Radio Resource Management, where the femtocell measures its radio environment and sets its own configuration. The problem with this approach is that the radio environment is changing constantly, as people move around, when windows are opened, or when new femtos are plugged-in or the macro network is re-planned. A failure to respond immediately to these changes causes serious problems.

Femto-to-macro interference: femtocells can create a “dead zone” for non-femto users, and femto-connected phones can cause macro “cell-breathing”, causing call problems for all users on the edge of the macro cell.

Macro-to-femto interference: the macro network can cause performance problems for femto users, because the level of interference varies as users move inside the building, when windows are opened, and according to the time of day.

Ubiquisys femtocells are different. They constantly listen to their environment and respond immediately using a range of patented interference mitigation systems. These technologies have been refined in commercial deployments over several years and are encapsulated in Femto-Engine software. They enable operators to provide a robust service in a shared spectrum environment and maintain macro network KPIs.