CLEAR SKY DETERMINATION IN UPLINK POWER CONTROL USING DUAL TIME CONSTANTS

摘要

An uplink power control system and a machine-implemented method for determining clear sky and adjusting uplink power are provided. A receiving station, which may be a satellite terminal or a satellite gateway, receives a reference signal from a satellite. The reference signal may be sampled over a sampling time period in order to compute a filtered short-term average downlink SINR. A filtered long-term average downlink SINR may be adjusted toward the filtered short-term average downlink SINR using either a first time constant or second time constant, based on a relationship between the filtered long-term average downlink SINR and the filtered short-term average downlink SINR. In some implementations, the second time constant is less than the first time constant.

主权项

1. A machine-implemented method for determining clear sky in uplink power control, the method comprising:
receiving, by a receiver at a receiving station, a reference signal from a satellite, the receiving station being either a satellite terminal or a satellite gateway; computing, by a component of the receiver, a filtered short-term average downlink signal-to-noise-plus-interference ratio based on samples of the received reference signal over a sampling time period; estimating, by the component of the receiver, a downlink fade based on a filtered long-term average downlink signal-to-noise-plus-interference ratio and the filtered short-term average downlink signal-to-noise-plus-interference ratio; when the estimated downlink fade is greater than zero, adjusting, by the receiver, the filtered long-term average downlink signal-to-noise-plus-interference ratio toward the filtered short-term average downlink signal-to-noise-plus interference ratio based, at least partly, on a value of a first time constant; when the computed downlink fade is less than zero, then adjusting, by the receiver, the filtered long-term average downlink signal-to-noise-plus interference ratio toward the filtered short-term average signal-to-noise-plus-interference ratio based, at least partly, on a value of a second time constant, the value of the second time constant being different value from the value of the first time constant; and adjusting, by the receiving station, the uplink power control based on the adjusted filtered long-term average downlink signal-to-noise-plus interference ratio and the filtered short-term average signal-to-noise-plus-interference ratio.