Handoff between digital wireless office system (DWOS) radio-infrastructure units using a conference call

摘要

An apparatus performs an inter-radio-infrastructure handoff ("inter-RI handoff") in a private mobile communication system when a mobile terminal roams from a first area served by a first radio-infrastructure (RI) to a second area served by a second RI unit. The system comprises a first RI unit connected to a first radiohead (RH), and a second RI unit connected to a second RH. An inter-RI handoff is performed using a conference call.