摘要:
A delivery system includes a delivery apparatus for delivering a common control signal to an area having one or more available communication systems and a terminal apparatus for receiving the common control signal transmitted from the delivery apparatus. The common control signal includes system information required to access the communication systems in the area, and the system information includes multiple control information items. The delivery system causes the delivery apparatus to generate a first common control signal commonly used in one or more areas, to receive a delivery request signal from the terminal apparatus requesting to deliver a certain control information item and to generate a second common control signal including the certain control information item to transmit to the terminal apparatus. Criteria to determine which of the control information items is to be included in the first common control signal are updated in accordance with a statistical tendency of the delivery request signals from the terminal apparatuses.
摘要:
A distribution apparatus which distributes to multiple regions includes: a storage unit which stores each of radio communications systems usable for each of the regions; a selecting unit which selects, out of the multiple regions to which the distribution apparatus distributes, first regions in which a radio communications system in operation is the same; and a distribution unit which distributes, based on each of the radio communications system usable for each of the regions that is stored in the storage unit, all or some of information on the radio communications system for each of the first regions selected by the selecting unit. One or multiple radio communications systems are usable in each of the regions.
摘要:
A base station includes an internal-area information storing unit storing system information necessary to connect to radio systems in an area to which the base station belongs; an external-area transmission method information storing unit storing external-area transmission method information indicating a method of transmitting a common control signal in an area adjacent to the area to which the base station belongs; and a transmitting unit wirelessly transmitting the common control signal including the system information stored in the internal-area information storing unit or the external-area transmission method information to the terminal equipment. The common control signal including the external-area transmission method information is transmitted at regular or irregular transmission timings.
摘要:
A radio communication apparatus includes: a receiving unit configured to receive a cognitive signal including system information of each of a plurality of systems; a metric unit configured to prepare metric information indicating relationship degree between the radio communication apparatus and a communication system to which the radio communication apparatus does not belong; a condition determination unit configured to determine whether a restriction should be imposed on transmission by the radio communication apparatus based on the system information and the metric information; and a transmission unit configured to transmit a signal using predetermined radio resources when transmission by the radio communication apparatus is not prohibited.
摘要:
To provide a radio communication control apparatus and a radio communication control method capable of controlling simultaneous transmission and reception so as not to degrade system throughput.A simultaneous transmission and reception controller 106 determines whether the simultaneous transmission and reception using the same frequency are possible, based on radio spectrum environment information of an opposite party of communication and radio spectrum environment information of a self-apparatus. When the simultaneous transmission and reception using the same frequency are determined to be possible, a control signal transmission section 109 transmits instruction information, indicating that the simultaneous transmission and reception are possible, and a transmission parameter thereof, to the above communication terminal. After the transmission parameter is set, a communication section 111 executes simultaneous transmission and reception with the above communication terminal using the same frequency, when the simultaneous transmission and reception using the same frequency are determined to be possible.
摘要:
A communication apparatus used in a spectrum sharing environment in which multiple communication systems coexist using the same spectrum band is provided. The apparatus includes a transmission pulse shaper that performs bandwidth limitation on a pulse which is used to send data symbols; a monitoring unit that monitors in-band interference conditions from coexisting systems other than a target system to which the communication apparatus belongs, and availability of unused spectrum on adjacent channels of the target system; a controller that controls a pulse transmission period and a pulse width of the transmission pulse shaper based on the monitoring result; and a transmission unit that transmits the band-limited signal.
摘要:
A base station includes an internal-area information storing unit storing system information necessary to connect to radio systems in an area to which the base station belongs; an external-area transmission method information storing unit storing external-area transmission method information indicating a method of transmitting a common control signal in an area adjacent to the area to which the base station belongs; and a transmitting unit wirelessly transmitting the common control signal including the system information stored in the internal-area information storing unit or the external-area transmission method information to the terminal equipment. The common control signal including the external-area transmission method information is transmitted at regular or irregular transmission timings.
摘要:
The invention relates to a surface-treated inorganic pigment which has an inorganic pigment having acid function and an amorphous body located on the surface of the inorganic pigment having acid function and formed by at least a divalent or higher-valent metal and an anion component in a state where the inorganic pigment and the amorphous body do not chemically bond to each other, and which does not exhibit acid function.
摘要:
A base station apparatus used for a FDD mobile communications system which uses at least a predetermined frequency bandwidth is disclosed. The base station apparatus includes a control unit which provides an instruction signal which at least indicates a frequency band used in wireless communications; and a unit which wirelessly communicates with a user apparatus according to the instruction signal, wherein, if the base station apparatus belongs to a predetermined border area between mobile communications systems, an instruction signal which indicates that use of one part of the predetermined frequency band is permitted, but use of another part is prohibited is provided by the control unit, and, if the base station apparatus belongs to a predetermined non-border area, an instruction signal which indicates that use of one part and use of the other part are permitted.
摘要:
In the communication system, a transmission signal based on the first radio access scheme is generated, and in the communication system a transmission signal based on the second radio access scheme different from the first radio access scheme is generated. A usage status of the frequency spectrum of the transmission signal based on the first radio access scheme, as well as the known parameters of the transmission signal based on the second radio access scheme, are determined by the pulse-shaping controller. Then, the pulse-shaping controller performs control so as to pulse-shape the transmission signal based on the first radio access scheme by means of the transmit filter on the basis of the result of the above determination, or performs control so as to pulse-shape the transmission signal based on the second radio access scheme by means of the transmit filter on the basis of the result of the above determination.