Method and device for establishing an inter-radio frequency subsystem interface (ISSI) unit-to-unit call

US8406800B2 · kind B2 · utility

Assignee

• MOTOROLA SOLUTIONS, INC. · US

Inventors

• Trent J. Miller · West Chicago, US
• Rod N. Averbuch · Chicago, US
• Gerald R. Drobka · Naperville, US
• Peter M. Drozt · Bartlett, US
• Sikendar Fidai · South Barrington, US
• Michael F. Korus · Eden Prairie, US
• Todd A. Leigh · Schaumburg, US
• Donald G. Newberg · Hoffman Estates, US
• Scott J. Pappas · Lake Zurich, US
• Brian R. Poe · Schaumburg, US
• Steven E. Vanswol · Lombard, US

Key dates

• Filing date: Apr 8, 2010
• Grant date: Mar 26, 2013
• Expiry date: Jun 28, 2031

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W76/10
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

A method and device enable establishing an inter-radio frequency subsystem interface (ISSI) unit-to-unit call between a calling unit of a calling home radio frequency subsystem (RFSS), and a called unit of a called home RFSS, through a hosted ISSI function (HIF). The method includes processing, at the HIF, a first invite message received from the calling home RFSS, wherein the first invite message includes a first request uniform resource identifier (URI) that designates an alias system unit identification (SU-ID). In response to the first invite message, transmitting, from the HIF to the called home RFSS, a second invite message, including a second request URI that designates a real SU-ID, wherein the HIF acts as the calling home RFSS. The unit-to-unit call is thus established between the calling unit and the called unit through the calling home RFSS, the HIF, and the called home RFSS.