SIMPLEX MOBILE TRANSMITTER ROAMING INDICATION
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-19
In multiple site frequency digital radio systems, the selection of the best site can be of utmost impor- tance. Many designs exist for full duplex subscribers and more limited designs exist for half-duplex radios. Typically these half-duplex devices have designs that allow site selection while receiving but not while transmitting. This means that if a transmit- ting device moves out of the coverage area, then the user who is transmitting does not know if his/her audio is intelligible at the receiving base site. On the next page is a method that can be used to overcome this site selection limitation in half-duplex sub- scriber devices. 2. Upon this voice gap detection, the subscriber will insert a Signal Check Request pattern instead of the silent voice information, 3. If the user unexpectedly generates voice (starts talking) during this roam check signalling sequence, then that voice is buffered and sent out following the roam check signalling sequence.