In wireless grids , such dedicated routing devices are not ( always ) available .
The bandwidth that is permanently available to traditional networks has to be either ' borrowed ' from an already existing network or publicly accessible bandwidth ( open spectrum ) has to be used .
In wireless grids , such dedicated routing devices are not ( always ) available and the bandwidth that is permanently available to traditional networks has to be either ' borrowed ' from an already existing network or publicly accessible bandwidth ( open spectrum ) has to be used .