Abstract: A phase lock loop which locks a numerically controlled oscillator (NCO) to a non-continuous reference signal. The phase of the reference signal is ascertained by detecting the zero crossings of the signal. The zero crossing is provided to a phase detector which compares the phase of the NCO with that of the reference signal. The phase detector generates a phase error which is provided to a loop filter. The loop filter filters the phase error and provides a control signal to the NCO. The phase detector is enabled for the duration corresponding to the time when the reference signal contains valid phase information. A mechanism detects bad reference cycles and removes the phase error corresponding to these bad reference cycles from consideration. Another mechanism detects phase locked by the phase lock loop by measuring the width of the reference cycles within the duration when the reference signal is valid.

Abstract: In a communication system capable of variable rate transmission, scheduling of high speed data transmission improves utilization of the reverse link and decreases the transmission delay in data communication. Each remote station is assigned a maximum unscheduled transmission rate for the duration of the communication with a cell. A maximum scheduled transmission rate can be assigned by a channel scheduler for scheduled transmission of data traffic at high rates. The maximum scheduled transmission rate is assigned in accordance with a set of system goals, a list of system constraints, and collected information on the status of the communication network. Data is partitioned in data frames and transmitted over the reverse link at or below the maximum scheduled transmission rate which have been assigned to the scheduled user.