Abstract: Methods and systems of measuring communication quality are provided, by which measurement schedules of communication quality can be managed and controlled easily. A plural measurement-time slot is set with respect to a communication line used for communication quality measurements between a plural communication terminal apparatus via a mobile communication network, wherein each measurement-time slot has a time corresponding to one measurement of communication quality and the plural measurement-time slot is continuously arranged at a predetermined period, and a plural measurement schedule for measuring communication quality in each of communications with the plural communication terminal apparatus to the plural measurement-time slot.

Abstract: Methods and systems of measuring communication quality in a communication via a mobile communication network are provided. A connection status of a communication terminal apparatus to a mobile communication network is confirmed when a timing of transmitting a measurement data of the communication terminal apparatus side from the communication terminal apparatus to a server comes. The measurement data is transmitted from the communication apparatus to the server when determining that it is a status capable of transceiving the measurement data, based on the confirmation result of connection status, and the measurement data is not transmitted from the communication terminal apparatus to the server when determining it is not a status capable of transceiving the measurement data. A communication quality in the communication via the mobile communication network is measured based on the measurement data received by the server from the communication terminal apparatus.

Abstract: Mobile communication systems and base station control apparatuses are provided, by which a spectral efficiency can be improved while preventing interference between a terrestrial cellular mobile communication system and a satellite mobile communication system, and mobile communication services using mobile station apparatuses can be provided more surely in an emergent condition in which a failure occurs in a part of terrestrial cellular base stations. A same frequency band is used for radio communications between a mobile station apparatus 10 and each of terrestrial cellular base stations 20 and a communication relay apparatus 41 of artificial satellite 40.

Abstract: Methods and systems of measuring communication quality are provided, by which various types of communication quality measurements can be flexibly performed as the measurement condition can be set or changed easily and optionally, while load of processing in the communication terminal apparatus can be suppressed. Measurement condition for measuring communication quality is delivered to a communication terminal apparatus capable of communicating via a mobile communication network and a communication with the communication terminal apparatus via the mobile communication network is performed at a predetermined timing that satisfies the measurement condition.

Abstract: Communication systems and communication methods are provided, by which load of a communication network when measuring a voice communication quality can be suppressed. A test signal for voice communication quality evaluation is transmitted to a communication terminal apparatus via a communication network, and a received voice data encoded by a predetermined scheme for the test signal received with the communication terminal apparatus is received from the communication terminal apparatus. A received voice signal is generated from the received voice data received from the communication terminal apparatus, and a evaluation value of voice communication quality is calculated by comparing the generated received voice signal with the test signal before transmitting.

Abstract: A mobile terminal and communication method capable of increasing the communication continuity and maintaining the communication quality of real-time communications are provided. The communication method according to the present invention is a method of communicating between a first mobile terminal 1a and a second mobile terminal 1b capable of wireless communication in a plurality of communication networks. First, information required to establish a communication session for performing communications is exchanged via the call control device 3 between the first mobile terminal 1a and the second mobile terminal 1b. Thereafter, a session to establish a communication session is established on the basis of the required information that has been exchanged. Communications are executed between the first mobile terminal 1a and the first mobile terminal 1b by means of the established communication session.

Abstract: [Problems] Mobile communication enabling continuation of TCP communication while maintaining the quality in a real-time communication. [Means for Solving Problems] A mobile terminal 3a comprises an application executing section 39 for executing a data transmitting/receiving application, a quality monitoring section 38 for detecting the quality of communication such as of a wireless LAN 4, an address control section 31 for making it enable to provide either or both of a static address and a care-of address to the application as a receiving address for the data transmission/reception depending on the type of the application being executed by the application executing section 39 and the result of the detection t by the quality monitoring section 38, and a network selection switching section 33 for selecting a communication route via a home agent when the fixed address is selected as the receiving address and for selecting a communication route not via the home agent when the care-of address is selected.

Abstract: A leading wave position detecting unit and method etc. is provided for detecting the position of the leading wave in a delay profile. Time spaces between sampled values (?1–?13) in the delay profile are measured. Among the measured time spaces, a maximum time space (?8) is determined, and the position of its immediately following sampled value (sampled value (h)) is detected as a leading position. The initial peak of the sampled values after the leading position detected (position of sampled value (j)) is determined as a leading wave position.

Abstract: A leading wave position detecting unit and method etc. is provided for detecting the position of the leading wave in a delay profile. Time spaces between sampled values (?1-?1 3) in the delay profile are measured. Among the measured time spaces, a maximum time space (?8) is determined, and the position of its immediately following sampled value (sampled value (h)) is detected as a leading position. The initial peak of the sampled values after the leading position detected (position of sampled value (j)) is determined as a leading wave position.

Abstract: A leading wave position detecting unit and method etc. is provided for detecting the position of the leading wave in a delay profile. Time spaces between sampled values (&tgr;1-&tgr;13) in the delay profile are measured. Among the measured time spaces, a maximum time space (&tgr;8) is determined, and the position of its immediately following sampled value (sampled value (h)) is detected as a leading position. The initial peak of the sampled values after the leading position detected (position of sampled value (j)) is determined as a leading wave position.

Abstract: A mobile communication system is provided in which a base station commands a mobile station (or field monitor) to measure the field strength for a specific channel. The mobile station reports the measured results to the base station. The measured results are used in conjunction with base station identification codes to obtain a single representative value which is used to determine what channels can be selected and used by the system. This enables an existing cellular system to be utilized as a first mobile communication system, and makes it possible to construct a second mobile communication system in the same area as the service area of the first system.

Abstract: A mobile communication system having a high precision frequency base station device with a high precision frequency generator, and the other low precision frequency base station device with a low precision frequency generator which receives transmission waves from the high precision frequency base station device using a transmission frequency in a prescribed frequency precision, and carries out transmission and reception by controlling transmission and reception frequencies of own station in accordance with the frequency precision of the received transmission waves.

Abstract: A re-use partition of cells in a mobile communication system has an outer cell (30) and an inner cell (20) which is provided in the outer cell (30). An interval of cells using the same channel or the same frequency in the inner cells is shorter than an interval in the outer cells, which is the nature of a re-use partition. Communication between a base station and a mobile station is carried out by using a channel having a higher received level of an outer cell channel or an inner cell channel. A base station has a first beam tilt antenna having tilt angle (.THETA..sub.out) for an outer cell (30), and a second beam tilt antenna having tilt angle (.THETA..sub.in) so that .THETA..sub.in is larger than .THETA..sub.out. A speech channel and a control channel are provided for each of the first antenna and the second antenna.

Abstract: The system for measuring the spillover signal from a transmitter to a receiver in a same frequency repeater or a booster has a frequency conversion device which slightly offsets the transmission frequency from the reception frequency, and a signal detector which measures the offset frequency component in the reception signal. The offset frequency is around 100 Hz, which is higher than the fading frequency, and low enough not to affect the operation of receivers. The measured spillover level is used to control the gain of the repeater, and/or to cancel the spillover signal, so that the repeater has the maximum gain without suffering from oscillation.