A storage device is monitored for data integrity errors and each detected data integrity error is stored in a count. A controller is adapted to monitor a first parameter associated with the first vehicle sub-system and a second parameter associated with the second vehicle sub-system. The silicon epitaxial layer has a phosphorus concentration of about 1\xd71021 atoms per cubic centimeter or greater, and is formed without the addition of carbon. One frequency is preferably used to operate a pilot beacon for transferring calls between adjacent cells in a soft manner.