Abstract: A method and apparatus for synchronized hand off from a cellular network (138) to a wireless network (100) includes an antenna (110) capable of receiving a synchronization channel and a pilot channel (112). Within the wireless network (100) is an access point (104) and a cellular timing recovery receiver (106) coupled to the antenna (110). The cellular timing recovery receiver (106) receives the synchronization channel and the pilot channel (112), which are provided to the access point (104) from a cellular base station (114). The cellular timing recovery receiver (106) thereupon generates a clock pulse (120) and a clock setting signal (122) which are provided to the access point (104), which are utilized to synchronize an internal clock with respect to the timing of the cellular base station (114). Thereupon, the wireless area network (100) may be synchronized with a cellular network (138) message information (150c).

Abstract: An apparatus and method provides synchronous communication in a communication environment (102) wherein multiple base stations are adapted to operate on the same frequencies. In particular, the base stations which operate within range of one another must be coordinated to minimize interference with other base stations which may otherwise operate independently. Each base station operating in a system will determine whether another base station operating on the same frequencies is within range (310). One of the base stations will assume a role as a master and the remaining base station will then synchronize to the master base station (312). The preferred methods for synchronizing the base stations includes signaling protocols (702, 902) and collision avoidance techniques for digital multiple access communication systems.

Abstract: A fast responding, low jitter, digital phase lock loop which is especially suited for synchronous, non return to zero, digitally encoded clock recovery applications.Both leading and trailing transitions of the digital waveform triggers a monostable multivibrator which generates well defined transition pulses. These pulses are fed to a phase comparator, where they are simultaneously compared with the output of a programmable frequency divider, whose input couples to a reference frequency oscillator. The detected phase relationship between the two compared signals causes the divider to either increase, or decrease its division factor and thereby readjust the relative phase relationship between the divided signal and the digital signal until they are in phase lock.During an absence of digital signal input, provision is made for selecting a third division factor whose value is between the first and second factors.