CHANNEL ACTIVITY SENSITIVE WATCH DOG TIMER FOR ACK/NACK RECEPTION MONITORING
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-12
AFCO 25 specifies a packet data service that must coexist on a shared channel with voice. When oper- ating the data service, ACKS and NACKS are trans- mitted back and forth as appropriate. Watch dog timers are used to monitor timely receipt of such messages. Voice can capture the channel, however, and delay transmission of the ACK/NACK. If the timer expires before an ACK can be received because of intervening voice, retransmission of the original message may be unnecessarily initiated.