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    • 89. 发明公开
    • Apparatus and method for supporting analog fax calls in a tandem configuration
    • 装置和方法用于在串联构造支持模拟传真呼叫
    • EP1526708A1
    • 2005-04-27
    • EP05001670.8
    • 1998-08-04
    • QUALCOMM INCORPORATED
    • Leung, Nikolai K. N.
    • H04N1/00H04N1/327
    • H04N1/00307H04N1/00315H04N1/32765H04N1/33323H04N1/33392H04N2201/0093H04N2201/33364
    • The present invention provides an apparatus and method for supporting analog fax calls between two wireless subscriber stations (62, 70) in a tandem configuration. The existence of a tandem configuration is detected, and a more efficient communication protocol is established between two base stations (64, 68) upon detection of the tandem configuration. A message generator (86a) in a first base station (64) generates an identification message. If the identification message is received by a second base station (68), the second base station (68) will be informed that the tandem configuration exists. A message generator (86b) in a second base station (68) may then generate a return message, which when received by the first base station (64), will notify the first base station (64) of the existence of the tandem configuration. To support the tandem configuration, full duplex communication may be established between the two base stations (64, 68). Full duplex communication may be realized by incorporating an echo canceler (96a) in the base station, or by utilizing both BFSK channels of the V.21 fax system for communication. The tandem configuration may also be supported by advanced flag synchronization. Thus, after a message is transmitted from a first base station (64) to a second base station (68), the second base station (68) will immediately start sending preamble flags to the first base station (64). The fist base station (64) may then synchronize its receiver (82a) for immediate receipt of the return message from the second base station (68).