RECOGNITION OF INVALID SIGNALS IN SCAN WHEN USING APCO-25 COMMON AIR INTERFACE
Original Publication Date: 1999-Jun-01
Included in the Prior Art Database: 2002-Aug-19
Unmme delays in conventional scan represent a significant customer concern. Unmute delays can be minimized by decreasing the time required to verify that received RF activity does not meet the qualification rules for a given channel. By decreas- ing the time scan spends on a channel with unquali- tied activity the time to reach a channel with quali- tied activity is decreased. When digital activity is detected, the existing scanner always waits 360 milli seconds to allow recovery of both LDUl and LDU2 (defined below). There are cases in which recovery of both LDU's is not necessary, and the scanner can leave the channel 180 milli seconds faster. This will decrease voice umnute delays.