AN EFFICIENT METHOD TO KEEP TRACK OF SERVICE CANCELLATIONS DURING ZONE ROAMING
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-12
The problem occurs in wide area distributed tnmked communication systems, such as OmniLink or APCO, when a radio roams to a new zone and cancels a request before the controlling zone can add the new zone into the call. Since the new zone does not know that the radio is involved in a call, it ling Zone) will dump the request. When the new zone actually receives the message to add the radio into the call, it will not remember/know that the radio has can- celled the request. As a result, the call might poten- tially be stuck where the controlling zone thinks that call has been added since resources have been acquired, but the radio is not involved in the call. See Figure 1 for an example.