METHOD AND APPARATUS FOR DIRECT COMMUNICATION IN A TDMA RADIO COMMUNICATION SYSTEM

摘要

Direct communication between a primary portable unit initiating the communic ation and a secondary portable unit is establishecl utilizing two handshaking operations . The first handshaking operation is performed in the base station channel to establish initial contact between the primary and secondary portable units. After initial contact is m ade, the second handshaking operation is performed to establish communication in an unoccupi ed channel. The base station channel and the unoccupied channel may be a TDMA/TDD channe l or a TDMA/FDD channel.