Abstract: According to one embodiment, a network device includes a receiver, a processor and a transmitter. The receiver receives a delivery reservation request of content from a first terminal in a coverage area of the network device. The processor selects a first network device from among a plurality of other network devices on the basis of the delivery reservation request, the other network devices being wirelessly communicable with terminals in respective coverage areas. The transmitter transmits a cache request to the first network device, the cache request instructing to acquire and cache the content from a content provision device. The transmitter transmits first information to the first terminal, the first information being information required to acquire the content from the first network device.

Abstract: A mobile communication terminal includes a module configured to measure, at a first frequency, the reception quality of a radio signal transmitted from a base station serving the mobile communication terminal in a standby mode, a module configured to evaluate the measured reception quality, and a module configured to change the first frequency to a second frequency on the basis of the evaluation result of the reception quality.

Abstract: When a first base station serving a mobile communication terminal in a standby mode, a first neighbor list is acquired from the first base station and stored in a memory. If the serving base station is changed in a standby mode from the first base station to a second base station, a second neighbor list is acquired from the second base station. When the second base station is serving the mobile communication terminal in a standby mode, the communication quality between the mobile communication terminal and each second peripheral base station listed in the acquired second neighbor list, and between the terminal and each first peripheral base station listed in the stored first neighbor list. Based on the measurement results, a peripheral base station that satisfies a preset condition is selected as a hand-off destination candidate.

Abstract: When deterioration in throughput is detected, it is determined whether a factor of the deterioration is deterioration in channel quality or concentration of traffic. If the factor of the deterioration in the throughput is the concentration of the traffic, it is determined whether or not a base station to become a switching candidate for a serving sector is present around, and if it is present, switching of the serving sector is requested to a serving base station. In contrast, if the factor of the deterioration in the throughput is the deterioration in the channel quality, it is determined whether or not a base station to become an adding candidate for the serving sector is present around, and if it is present, adding of the serving sector is requested to the serving base station.

Abstract: When deterioration in throughput is detected, it is determined whether a factor of the deterioration is deterioration in channel quality or concentration of traffic. If the factor of the deterioration in the throughput is the concentration of the traffic, it is determined whether or not a base station to become a switching candidate for a serving sector is present around, and if it is present, switching of the serving sector is requested to a serving base station. In contrast, if the factor of the deterioration in the throughput is the deterioration in the channel quality, it is determined whether or not a base station to become an adding candidate for the serving sector is present around, and if it is present, adding of the serving sector is requested to the serving base station.

Abstract: A mobile communication terminal includes a module configured to measure, at a first frequency, the reception quality of a radio signal transmitted from a base station serving the mobile communication terminal in a standby mode, a module configured to evaluate the measured reception quality, and a module configured to change the first frequency to a second frequency on the basis of the evaluation result of the reception quality.

Abstract: A decision part decides the target value of an SIR (signal to interference ratio) on the basis of the error rate of a reception signal. An SIR determination part determines an SIR regarding the reception signal in a predetermined determination cycle. A detection part detects an unconverged state in which the determined SIR does not converge on the decided target value within a period longer than the determination cycle. A correction part keeps the target value unchanged when no unconverged state is detected, and corrects the target value when the unconverged state is detected. A generation part generates transmission power information on the basis of the determined SIR and the output value of the correction part.

Abstract: When a first base station serving a mobile communication terminal in a standby mode, a first neighbor list is acquired from the first base station and stored in a memory. If the serving base station is changed in a standby mode from the first base station to a second base station, a second neighbor list is acquired from the second base station. When the second base station is serving the mobile communication terminal in a standby mode, the communication quality between the mobile communication terminal and each second peripheral base station listed in the acquired second neighbor list, and between the terminal and each first peripheral base station listed in the stored first neighbor list. Based on the measurement results, a peripheral base station that satisfies a preset condition is selected as a hand-off destination candidate.

Abstract: A frequency conversion apparatus comprising a sampling circuit for receiving a first intermediate frequency signal extracted from an input signal and having a predetermined intermediate frequency and a predetermined band width and sampling the first intermediate frequency signal in accordance with a predetermined sampling frequency signal, to output a second intermediate frequency signal, and a sampling signal generator for outputting the sampling frequency signal to the sampling circuit, the sampling frequency signal having a frequency determined so that an integer multiple of not less than three times the sampling frequency is outside a frequency range of the input signal.