CELLULAR TELECOMMUNICATIONS NETWORK HAVING SEAMLESS INTEROPERABILITY BETWEEN EXCHANGES WHILE SUPPORTING OPERATION IN MULTIPLE FREQUENCY HYPERBANDS

摘要

A system and method of providing seamless interoperability for a mobile station roaming between cellular telecommunication systems (31) operating in multiple hyperbands such as the 1900-MHz PCS hyperband and the 800-MHz cellular telephone hyperband, utilizing United States cellular standards. An enhanced inter-exchange communications protocol based on IS-41 is utilized to communicate information required for seamless interoperability between mobile switching centers (MSCs) (MSC1, MSC2). The enhanced inter-exchange communications protocol comprises a plurality of signaling messages (51) and a plurality of modified message parameters (52) within the signaling messages. The modified message parameters (52) are modified to include information elements (53) required for seamless interoperability between the multi-hyperband capable exchanges and are added as optional (overriding) parameters to the signaling messages.