METHODS AND APPARATUS FOR FAST DOWNLINK INFORMATION OF UPLINK OUT-OF-SYNCHRONIZATION

摘要

Information systems, detectors, and methods for a communication link, such as the downlink of a cellular telephone system, reduce the problem of uplink transmit power peaks when the uplink is out of synchronization (OoS). One method of indicating that a first link to a communication node is OoS includes the step of including an OoS signal in signals that are sent by the node on a second link. The OoS signal includes at least one data bit transmitted by the node that indicates that the first link is synchronized or OoS. A method of determining that a first link to a communication node is OoS includes the step of detecting an OoS signal in signals that are sent by the node on a second link. The OoS signal includes at least one data bit that indicates that the first link is synchronized or OoS, comprising a change-of-sign of symbols, a power level offset between information elements or different scale factors on the pilot symbols. When the first link is OoS, transmit power control commands from the second link are excluded from determining transmit power on the first link.