Wireless communications systems and methods related to performing initial network access procedures using shared resources are provided. A first wireless communication device transmits, in a first frequency band, a random access request to a first network. The first wireless communication device receives, in response to the random access request, a random access response from a second wireless communication device of the first network. The random access response is in a second frequency band allocated to the first network for time-division duplexing (TDD) communications. The second frequency band is different than the first frequency band.

A method for wireless communication includes transferring uplink data to a movable object during a first time slot, measuring channel quality associated with one or more frequency channels during a second time slot to select a working frequency channel from the one or more frequency channels, and receiving downlink data from the remote terminal using the working frequency channel during a third time slot. The first, second, and third time slots do not overlap each other. The uplink data includes synchronization information for synchronizing data transmission with the movable object.

Methods, systems, and devices for dynamic spectrum access in a single-channel MANET are described. An example system for network management includes a first wireless device configured to perform, using a receive mode and a transmit mode, data communications on a first channel associated with a first single-channel network, and transmit, using the transmit mode, network advertisement messages on a second channel associated with a second single-channel network, wherein each of the network advertisement messages comprises one or more characteristics of the first single-channel network, and a second wireless device configured to perform, using the receive mode and the transmit mode, data communications on the second channel, acquire, using the receive mode, at least one network advertisement message of the network advertisement messages on the second channel, and perform, based on the at least one network advertisement message, a comparison between the first single-channel network and the second single-channel network.

The present invention provides systems and methods for improved data communication between communication terminals such as a base station and an unmanned aerial vehicle. In some instances, the systems and methods described herein provide robust transmission uplink data such as control data and wideband transmission of downlink data such as image data or other sensor data, while avoiding interference between the uplink data transmission and the downlink transmission.

[Object] To provide a server device which can effectively apply a network coexistence service to a mobile body whose location can change every moment.

[Solution] Provided is a server device including: a control unit configured to provide a plurality of lists in which an available frequency and transmission power of the frequency are described for each predetermined range determined on a basis of a predetermined criterion so that the frequency is not set in an overlapped manner in the same predetermined range, to an external device which uses the frequency.

Techniques are provided for diminishing adjacent channel interference between radios using shared frequency spectrum. A guard band may be inserted between a pair of adjacent frequency spectrums so that they are no longer adjacent.

A method is provided for channel estimation of an antenna array comprising multiple antenna elements. The method comprises obtaining channel state information for antenna elements with a high-end radio frequency chain, wherein the antenna elements with the high-end radio frequency chain are placed in the antenna array intermittently with antenna elements with a low-cost radio frequency chain. Channel state information is estimated for the antenna elements with the low-cost radio frequency chain, by interpolating the channel state information obtained for the antenna elements with the high-end radio frequency chain.

Wireless communications systems and methods related to performing initial network access procedures using shared resources are provided. A first wireless communication device transmits, in a first frequency band, a random access request to a first network. The first wireless communication device receives, in response to the random access request, a random access response from a second wireless communication device of the first network. The random access response is in a second frequency band allocated to the first network for time-division duplexing (TDD) communications. The second frequency band is different than the first frequency band.

A method and system for dynamically reconfiguring an air interface that defines a continuum of frames each divided into a sequence of transmission time intervals (TTIs). The air interface is initially configured according to a first radio access technology (RAT). The base station then detects that at least a threshold extent of wireless client devices (WCDs) served by the base station on the air interface support operation according to a second RAT. And in response, the base station reconfigures the air interface so that certain TTIs per frame instead operate on a second RAT, with the remaining TTIs per frame still operating on the first RAT. The base station then serves WCDs that support the second RAT in the TTIs now configured according to the second RAT, while continuing to serve other WCDs according to the first RAT in the remaining TTIs configured according to the first RAT.

A wireless communication system that includes a base station and one or more terminals carries out wireless data communication by use of a first frequency band. The wireless communication system includes a wireless access system that employs a CSMA/CA and/or TDMA/TDD system as the wireless access system of the wireless communication system and a control signal at the first frequency band is periodically broadcasts from the base station, where the control signal includes a control information configured to manage wireless data transmission by the one or more terminals. In addition to the first frequency band, one or more frequency bands different from the first frequency band for the wireless data transmission by the one or more terminals can be allocate by the base station, where the control signal at the first frequency band indicate the location of the one or more frequency bands which can be used.