The application discloses a transceiver, including a calibration signal generation unit, a transmission unit, a receiving unit and a control unit. The calibration signal generation unit generates test signal to the transmission unit in a phase calibration mode. The receiving unit generates a digital receiving signal. The control unit calculates a phase difference between the digital receiving signal and a given reference phase and selectively adjust the transmission unit or the receiving unit accordingly. The application discloses a transceiver calibration method as well.

The present disclosure discloses a four-dimensional over the air performance test method for a dynamic scene channel. By constructing a time-domain non-stationary dynamic scene channel model, and selecting over the air (OTA) probes of appropriate number, positions and power weight in a four-dimensional multi-probe anechoic chamber (4D-MPAC) test system through a probe selection algorithm, finally a 4D-MPAC dynamic channel test system for a target channel in a DUT test area is constructed, which makes a contribution to solve the current problem of OTA performance test for a time-domain non-stationary channel. The present disclosure aims to provide a four-dimensional multi-probe anechoic chamber (4D-MPAC) for the dynamic scene channel, which can effectively and accurately reproduce a target dynamic scene channel model in an anechoic chamber on the basis of reducing the cost of the test system as much as possible by constructing the dynamic scene channel model, and provide an index for judging the accuracy of constructing the dynamic scene channel model.

Embodiments of the present disclosure provide a server data sending method and a server data sending apparatus. The method can include: acquiring, by a server, crystal oscillator error information and operating rate information of a terminal; setting, by the server, preamble length information according to the crystal oscillator error information and the operating rate information; and sending, by the server, a downlink data frame to the terminal, the downlink data frame comprising a preamble aligned with the preamble length information.

A transmission/reception baseband-processing device includes a calibration-processing unit configured to correct an input signal input to a transmission unit on the basis of a first characteristic according to characteristics of the transmission unit of a transmission/reception front end-processing unit and a calibration reception unit that is a reception unit of a calibration transmission/reception unit and a second characteristic according to a characteristic of the calibration reception unit.

A test apparatus includes a test antenna that is provided in an OTA chamber 50 and transmits or receives a radio signal to or from an antenna 110 of a DUT 100, and a measurement device that measures transmission characteristics or reception characteristics of the DUT 100 disposed in a quiet zone QZ, by using the test antenna. The test antenna includes a reflector reflection type test antenna 6a that transmits or receives a radio signal to or from the antenna 110 of the DUT via a reflector 7, and mirror reflection type test antennae 6b, 6c, 6d, 6e, and 6f that transmits or receives a radio signal to or from the antenna 110 of the DUT via mirrors 9b to 9f.

Systems and methods for a scalable test model for a cellular communications system having multiple different bandwidth and subcarrier combinations are disclosed. Embodiments of a method performed by a test node and corresponding embodiments of a test node are disclosed. In some embodiments, a method performed by a test node comprises generating a test signal for a particular bandwidth and subcarrier spacing combination, the test signal being in accordance with a test model that is scalable for a plurality of different bandwidth and subcarrier spacing combinations. By using the scalable test model, the test model can be flexibly used to test for different bandwidth and subcarrier spacing combinations.

A system includes a radio frequency (RF) connector terminal that is configured to connect to an antenna, and a RF transmitter that transmits RF power to the RF connector terminal. The system further includes a power measurement unit that measures, as a first power measurement, first RF power of the RF transmitter power that is reflected via the RF connector terminal, and a controller that causes a transmission path discontinuity between the RF transmitter and the RF connector terminal. The power measurement unit further measures, as a second power measurement, second RF power of the RF transmitter power that is reflected from the discontinuity. The controller further determines if a first antenna is connected to the RF connector terminal based on the first and second power measurements.

A system includes a radio frequency (RF) connector terminal that is configured to connect to an antenna, and a RF transmitter that transmits RF power to the RF connector terminal. The system further includes a power measurement unit that measures, as a first power measurement, first RF power of the RF transmitter power that is reflected via the RF connector terminal, and a controller that causes a transmission path discontinuity between the RF transmitter and the RF connector terminal. The power measurement unit further measures, as a second power measurement, second RF power of the RF transmitter power that is reflected from the discontinuity. The controller further determines if a first antenna is connected to the RF connector terminal based on the first and second power measurements.

To suppress concentration of channel quality information requests and reports in a case of discontinuously transmitting reference signals at specific resources in a time domain, and thereby preventing degradation in throughput. A transmission apparatus transmits an instruction of CSI request distributed for each reception apparatus in a subframe concurrently with or earlier than a reference signal CSI-RS to each of reception apparatuses. Each of the reception apparatuses detects the CSI request from the transmission apparatus and calculates CSI from a channel estimation value of CSI-RS received thereafter. Then, the reception apparatus identifies CSI report subframe of the own apparatus from CSI report interval information of a given time interval notified in advance, the subframe in which the CSI request is detected and transmission timing of CSI-RS, and transmits a feedback signal including CSI report value by using PUSCH at the timing of the CSI report subframe.

A first optimization server including a first publish-subscribe broker is configured to connect to a first cellular base transceiver station, where the first cellular base transceiver station is configured to communicatively connect to entities, including a first entity, in an RF coverage area of the first cellular base transceiver station. A second optimization server includes a second publish-subscribe broker, where the first publish-subscribe broker and the second publish-subscribe broker are part of a publish-subscribe broker network that is operable to distribute published data packets between entities that are connected to a publish-subscribe broker of the publish-subscribe broker network, where the publish-subscribe broker network is configured to route data packets published by the first entity to a second entity via the first publish-subscribe broker and the second publish-subscribe broker if the second entity has subscribed to receive the data packets published by the first entity.