Embodiments of this application provide a wireless communication method and an apparatus. The method includes: A first communication apparatus receives first information, where the first information indicates a determining threshold of a parameter in a first parameter set, and the first parameter set includes at least one of the following parameters: location information, delay information, a timing advance rate, a rate of the timing advance rate, a Doppler value, a Doppler rate, and remaining coverage time. The first communication apparatus determines, based on the first information, whether an access condition is met, and performs random access when the access condition is met. This avoids a random access failure in a current cell and re-access in a next cell due to random access performed when the condition is not met.

Embodiments of this application provide a wireless communication method and an apparatus. The method includes: A first communication apparatus receives first information, where the first information indicates a determining threshold of a parameter in a first parameter set, and the first parameter set includes at least one of the following parameters: location information, delay information, a timing advance rate, a rate of the timing advance rate, a Doppler value, a Doppler rate, and remaining coverage time. The first communication apparatus determines, based on the first information, whether an access condition is met, and performs random access when the access condition is met. This avoids a random access failure in a current cell and re-access in a next cell due to random access performed when the condition is not met.

A network device is provided that uses power measurements to measure a relative phase between a received signal from a reference antenna in a plurality of antennas and a received signal from each antenna in the plurality of antennas except the reference antenna. The network device may use a direct phase measurement to measure the phase of other received signals from additional antennas.

A network device is provided that uses power measurements to measure a relative phase between a received signal from a reference antenna in a plurality of antennas and a received signal from each antenna in the plurality of antennas except the reference antenna. The network device may use a direct phase measurement to measure the phase of other received signals from additional antennas.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit, to a base station, a request for uplink reference signal resources for a beam training procedure. The UE may receive, in response to the transmitted request, control signaling identifying the uplink reference signal resources for the beam training procedure. The UE may transmit, using a set of multiple of beams, reference signals on the identified uplink reference signal resources and receive, in response to the transmitted reference signals, an indication of beam parameters for a beam at the UE. The UE may communicate with the base station using the beam at the UE according to the beam parameters.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit, to a base station, a request for uplink reference signal resources for a beam training procedure. The UE may receive, in response to the transmitted request, control signaling identifying the uplink reference signal resources for the beam training procedure. The UE may transmit, using a set of multiple of beams, reference signals on the identified uplink reference signal resources and receive, in response to the transmitted reference signals, an indication of beam parameters for a beam at the UE. The UE may communicate with the base station using the beam at the UE according to the beam parameters.

A GSM satellite communication system is in communication with a first satellite having a first field of view including a first plurality of cells in which a plurality of active User Equipment (UEs) are located. The plurality of active UEs are in direct communication with the first satellite. The satellite communication system includes a first feeder link and a first tracking antenna configured to communicate with the plurality of active UEs via the first satellite directly serving the first plurality of cells; a first processing device configured to communicate with the plurality of active UEs; and a second processing device configured to normalize delay for a plurality of beam centers of the first plurality of cells, and provide the normalized delay to the first processing device.

A GSM satellite communication system is in communication with a first satellite having a first field of view including a first plurality of cells in which a plurality of active User Equipment (UEs) are located. The plurality of active UEs are in direct communication with the first satellite. The satellite communication system includes a first feeder link and a first tracking antenna configured to communicate with the plurality of active UEs via the first satellite directly serving the first plurality of cells; a first processing device configured to communicate with the plurality of active UEs; and a second processing device configured to normalize delay for a plurality of beam centers of the first plurality of cells, and provide the normalized delay to the first processing device.

According to an example aspect of the present invention, there is provided an apparatus comprising at least one processing core, at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processing core, cause the apparatus at least to receive, from a first beam, information concerning frequency adjustment of a second beam, the second beam being different from the first beam, and apply the information when synchronizing with the second beam, and/or in transmitting to the second beam in an uplink transmission.

According to an example aspect of the present invention, there is provided an apparatus comprising at least one processing core, at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processing core, cause the apparatus at least to receive, from a first beam, information concerning frequency adjustment of a second beam, the second beam being different from the first beam, and apply the information when synchronizing with the second beam, and/or in transmitting to the second beam in an uplink transmission.