Providing consistent QoS is one of the most interesting and challenging aspects of mobile networking. We aim to use the network to investigate the extent to which guarantees can be made and the extent to which re-negotiation of QoS can be used to give more flexibility to applications.

The QoS will be supported in a hierarchical manner with the ATM layer attempting to preserve the requested service but falling back onto support from the higher layer protocols if necessary.

A more dynamic QoS which is adaptable to possibly quite rapid changes in the underlying transport.

We are currently reducing the size and power consumption of the radio interface with digital down-conversion and an integrated front-end. The next generation system will not be completely portable but we are aiming at a fully portable system within two versions.

Handover performance is one of the critical elements. There are a large number of different issues.

There will undoubtedly be some cases in which ad-hoc support would be advantageous. These are assumed to be where there is no wired infrastructure and hence no base-stations to interfere with. We would like to provide some