Disclosed are a method and apparatus for processing an uplink frequency offset of a communication system. The method on a base station side includes: demodulating a random access message sent by a terminal to obtain an initial Doppler frequency offset of the terminal and delivering the initial Doppler frequency offset to the terminal; receiving an uplink subframe signal sent by the terminal, estimating a residual Doppler frequency offset of the terminal on an uplink, obtaining a frequency retuning amount according to the residual Doppler frequency offset and delivering the frequency retuning amount to the terminal. The method on a terminal side includes: receiving an initial Doppler frequency offset sent by a base station, obtaining an initial uplink transmission frequency according to an initial downlink transmission frequency and the initial Doppler frequency offset and sending an uplink subframe signal; and receiving a frequency retuning amount sent by the base station, and obtaining a transmission frequency of a next uplink transmission according to the frequency retuning amount.

Disclosed are a method and apparatus for processing an uplink frequency offset of a communication system. The method on a base station side includes: demodulating a random access message sent by a terminal to obtain an initial Doppler frequency offset of the terminal and delivering the initial Doppler frequency offset to the terminal; receiving an uplink subframe signal sent by the terminal, estimating a residual Doppler frequency offset of the terminal on an uplink, obtaining a frequency retuning amount according to the residual Doppler frequency offset and delivering the frequency retuning amount to the terminal. The method on a terminal side includes: receiving an initial Doppler frequency offset sent by a base station, obtaining an initial uplink transmission frequency according to an initial downlink transmission frequency and the initial Doppler frequency offset and sending an uplink subframe signal; and receiving a frequency retuning amount sent by the base station, and obtaining a transmission frequency of a next uplink transmission according to the frequency retuning amount.

Methods, systems, and devices for wireless communications are described that provide for adjustment of a frequency offset based on switching between uplink/downlink (UL/DL) transmission/reception beam pairs between a UE and a base station. A connection may be established via a first UL/DL transmission/reception beam pair and a frequency tracking loop may be established and maintained to correct for frequency error (e.g., due to Doppler shift) of received transmissions at a receiving device. In cases where a beam switch is performed, and the UE and base station switch from the first UL/DL transmission/reception beam pair to a second UL/DL transmission/reception beam pair, and a frequency offset difference between the first and second UL/DL transmission/reception beam pairs may be applied to the frequency tracking loop. The frequency offset difference may be obtained from a table of frequency offset measurements of multiple UL/DL beam pairs using associated reference signal transmissions.

Methods, systems, and devices for wireless communications are described that provide for adjustment of a frequency offset based on switching between uplink/downlink (UL/DL) transmission/reception beam pairs between a UE and a base station. A connection may be established via a first UL/DL transmission/reception beam pair and a frequency tracking loop may be established and maintained to correct for frequency error (e.g., due to Doppler shift) of received transmissions at a receiving device. In cases where a beam switch is performed, and the UE and base station switch from the first UL/DL transmission/reception beam pair to a second UL/DL transmission/reception beam pair, and a frequency offset difference between the first and second UL/DL transmission/reception beam pairs may be applied to the frequency tracking loop. The frequency offset difference may be obtained from a table of frequency offset measurements of multiple UL/DL beam pairs using associated reference signal transmissions.

This application discloses a communication method and a communications device. The communication method includes: receiving configuration information sent by a base station, where the configuration information includes information about a first signal and quasi-co-location relationship information, and the quasi-co-location relationship information indicates that there is a quasi-co-location relationship between a port for sending the first signal and a port for sending a second signal; and obtaining a measurement quantity of the first signal based on a measurement quantity of the second signal and the quasi-co-location relationship information. According to the method, a quasi-co-location relationship is obtained and a measurement quantity is obtained based on the quasi-co-location relationship.

This application discloses a communication method and a communications device. The communication method includes: receiving configuration information sent by a base station, where the configuration information includes information about a first signal and quasi-co-location relationship information, and the quasi-co-location relationship information indicates that there is a quasi-co-location relationship between a port for sending the first signal and a port for sending a second signal; and obtaining a measurement quantity of the first signal based on a measurement quantity of the second signal and the quasi-co-location relationship information. According to the method, a quasi-co-location relationship is obtained and a measurement quantity is obtained based on the quasi-co-location relationship.

An illustrative embodiment disclosed herein is a method, by a satellite, including sending a downlink signal to a first endpoint and a second endpoint at a first time and receiving a first uplink signal from the first endpoint at a second time. The second time is based on a first delay value calculated by the first endpoint. The method further includes receiving a second uplink signal from the second endpoint at a third time. The third time is based on a second delay value calculated by the second endpoint. The method further includes calculating the first delay value and the second delay value based on one or more identifiers of the first endpoint and the second endpoint, respectively, and an algorithm and determining a first distance between the satellite and the first endpoint and a second distance between the satellite and the second endpoint.

An illustrative embodiment disclosed herein is a method, by a satellite, including sending a downlink signal to a first endpoint and a second endpoint at a first time and receiving a first uplink signal from the first endpoint at a second time. The second time is based on a first delay value calculated by the first endpoint. The method further includes receiving a second uplink signal from the second endpoint at a third time. The third time is based on a second delay value calculated by the second endpoint. The method further includes calculating the first delay value and the second delay value based on one or more identifiers of the first endpoint and the second endpoint, respectively, and an algorithm and determining a first distance between the satellite and the first endpoint and a second distance between the satellite and the second endpoint.

A wireless communication method includes generating a pilot signal that is represented using a complex exponential signal having a first linear phase in a time dimension and a second linear phase in a frequency dimension; and transmitting the pilot signal over a wireless communication channel using transmission resources that are designated for pilot signal transmission in a legacy transmission network such as a Long Term Evolution (LTE) network.

A wireless communication method includes generating a pilot signal that is represented using a complex exponential signal having a first linear phase in a time dimension and a second linear phase in a frequency dimension; and transmitting the pilot signal over a wireless communication channel using transmission resources that are designated for pilot signal transmission in a legacy transmission network such as a Long Term Evolution (LTE) network.