Abstract: A radio communication system provided with a communication device and a radio communication network system is characterized by comprising a transmission delay estimate information transmitting means for transmitting transmission delay estimate information to the radio communication network system when the transmission condition of the transmission delay estimate information is met.

Abstract: A radio communication system provided with a communication device and a radio communication network system is characterized by comprising a transmission delay estimate information transmitting means for transmitting transmission delay estimate information to the radio communication network system when the transmission condition of the transmission delay estimate information is met.

Abstract: [Problems] Because it is not possible to reduce sufficiently the number of base stations that starts uselessly in spite of being in light traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. [Measures] A base station receives a transmission signal from a mobile station to other base station, and starts transmission of a control signal with predetermined power depending on a reception condition of the transmission signal.

Abstract: The present invention is applicable to a wireless communication system provided with mobile terminals and base stations that manage cells to which the mobile terminals are connected. The wireless communication system of the present invention has a new cell detection unit that detects, from among neighbor cells which are adjacent to the cells to which the mobile terminals are connected, new cells that have newly started or whose operation has resumed or whose geographical range has changed, and a neighbor cell list generation unit which preferentially registers new cells that have been detected by the new cell detection unit in neighbor cell lists in which are registered neighbor cells that are candidates for handover destinations of the mobile terminals.

Abstract: In one embodiment, a first mobile station (3) can be wirelessly connected to a first network (5) and can be wirelessly connected to a second mobile station (4) that is wirelessly connected to a second network (6). The first mobile station (3) performs control on whether to be wirelessly connected to the first network (5) or the second mobile station (4) in accordance with the network selected from the first network (5) or the second network (6) based on information regarding the second network (6). It is thus for example possible to contribute to an efficient selection of a communication path of the first mobile station (3) that can use both of a first communication path that is via a direct wireless connection to the first network (5) and a second communication path that is via a wireless connection to another mobile station (4).

Abstract: To provide appropriate communication quality inside a building regardless of the building penetration loss of the building in which a femto base station is installed while suppressing the interference caused by radio waves leaked outside the building, a femto base station 4 receives a radio signal that passes through a structure and arrives at the installation place of the femto base station 4 (e.g., radio signal transmitted from a Global Positioning System) and estimates the penetration loss L of the structure based on the receiving state of the radio signal. Further, the femto base station 4 performs radio resource management based on an estimation result of the penetration loss L, and communicates with a mobile station 7-2.

Abstract: In order to reduce interference to a macro user equipment by easily selecting a home cell serving as the source of interference to the macro user equipment and adjusting a transmission power or the like, a plurality of base stations (10—1 to 10—3) that constitute a mobile communication system (1) respectively form cells (11—1 to 11—3) for radio communication. A network device (50) causes candidates for a first base station that should perform reconfiguration of the cell among the base stations (10—1 to 10—3) to execute the reconfiguration. The candidates for the first base station are selected based on radio resources used by each of the base stations (10—1 to 10—3) at the time of forming the cells (11—1 to 11—3). Alternatively, the first base station is selected based on uplink interference to each of the base stations (10—1 to 10—3).

Abstract: A communication device includes an calculation unit, a measuring unit, a setting unit, and a determination unit. The calculation unit calculates an index value according to each of the other communication devices for determining whether to let a wireless resource utilized for communications with the other communication device be a candidate allocated to the other communication device based on the quality of a channel to the other communication device. The measuring unit measures a congestion degree between itself and the other communication device. The setting unit calculates a threshold value for determining whether to let the wireless resource be the candidate allocated to the other communication device based on the measured congestion degree. The determination unit compares the index value with the threshold value to determine whether to let the wireless resource be the candidate allocated to the other communication device.

Abstract: A wireless communication system (100) includes a plurality of mobile stations (30, 40), a macro base station (10), and a femtocell base station (20) that communicatively connects to a registered mobile station. The femtocell base station (20) includes: a handover execution unit (25) that, when a communication quality of a received signal received from one mobile station which is not a registered mobile station satisfies a predetermined condition and a communication connection to another mobile station is made, hands over the communication connection of another mobile station to the macro base station (10); and a transmission power control unit (26) that, when a received signal is received from one mobile station which is not a registered mobile station and the communication connection to another mobile station is not made, suppresses power of a transmission signal transmitted to the mobile station.

Abstract: A base station 1 includes a radio communication unit 11 and a frequency channel control unit 15. The radio communication unit 11 is capable of forming a primary cell and a secondary cell, and transmitting a physical channel for data transmission (HS-PDSCH) in each of these two cells. Further, the frequency channel control unit 15 determines a frequency channel available to the secondary cell based on the load status of a nearby cell formed by a nearby base station 7. In this way, the interference to the nearby cell caused by the base station 1 is suppressed.

Abstract: A mobile station determines, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status and/or on/off of the predetermined measurement and controls execution of the predetermined measurement based on the determination.

Abstract: A frequency management method and device as well as a wireless system are provided by which acceptable transmit power is efficiently determined for transmitting stations in a system on the interfering side, neither with concentration of processing load on some part nor with redundant processing. When a frequency management apparatus (50—1) receives a notice regarding a change in the state of frequency use from a radio station (20—1) under its own management (S101), the frequency management apparatus (50—1) sets acceptable transmit power for radio stations (20—1, 20—2) under its own management and radio stations (20—3, 20—4) managed by another frequency management apparatus (50—2), based on the notified change in the state of frequency (S103, S104).

Abstract: To provide appropriate communication quality between a radio station (e.g., small-scale base station) and a mobile station in a state where the radio station is located within a large-scale cell and communicates with the mobile station while reducing interference exerted on the large-scale cell by communication between the radio station and the mobile station regardless of the place of the radio station within the large-scale cell. A femto base station 4 sets a target received power RTWP_target of uplink data used for controlling transmission power of uplink data transmission from a mobile station on an uplink based on a measurement result of received power Pmacro of a pilot signal transmitted from a macro base station 3. Specifically, the target received power RTWP_target is preferably set to a larger value as the received power Pmacro of the pilot signal becomes smaller.

Abstract: A device acquires load information representing a load of radio communication performed between a base station and a plurality of communication terminals performing radio communication with the base station by using a radio resource allocated by the base station. The device sets in response to the acquired load information, from a first radio resource range and a second radio resource range, a radio resource range that the base station can allocate to an edge communication terminal whose channel quality is less than a predetermined threshold.

Abstract: In order to effectively determine an optimized radio resource, a radio communication system (100) includes a plurality of first base stations (111) and a plurality of first mobile stations (112) respectively connected to the plurality of first base stations (111). In the radio communication system (100), there are included calculation means (103) for calculating a statistic (130) by aggregating interference levels of radio waves between the plurality of first base stations (111) and second mobile stations (122) connected to a second base station (121) that forms a second cell (120) larger than a first cell (110) formed by each of the first base stations (111); and determination means (104) for determining, based on the statistic (130), a radio resource to be used by the plurality of first base stations (111) or the plurality of first mobile stations (112).

Abstract: A mobile station determines, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status and/or on/off of the predetermined measurement and controls execution of the predetermined measurement based on the determination.

Abstract: [Problems] Because it is not possible to reduce sufficiently the number of base stations that starts uselessly in spite of being in low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. [Measures] A base station starts transmission of a control signal with predetermined power when communication between other base station and a mobile station is started and a first predetermined condition is satisfied.

Abstract: A radio station (1) includes a first part (1A) and a second part (1B). The second part (1B) can be arranged so as to be physically separated from the first part (1A) and is connected to the first part (1A) via a transmission line (40) so as to be able to communicate with the first part. Each of the first part (1A) and the second part (1B) includes a digital signal processing unit (11A, 11B) and is capable of alternatively performing digital signal processing for user data. An analog signal processing unit (13) arranged in the second part performs analog signal processing including at least one of frequency conversion and power amplification to provide an air interface to a mobile station.

Abstract: A method for controlling reporting setting that enables reporting setting to be changed quickly in a system where CoMP transmission is performed, as well as a wireless communications system using the same are provided. In a wireless communications system based on a coordinated transmission scheme in which multiple transmission stations included in a network perform transmission in coordination with each other, the network notifies multiple pieces of reporting setting information for channel state information to a reception station that is a target of the coordinated transmission scheme, and the transmission stations and the reception station share reporting setting information to be applied among the multiple pieces of reporting setting information.

Abstract: The present invention is a device which, when a second wireless system shares the use of a frequency which is allocated to a first wireless system, estimates receiving power when a second wireless signal which is transmitted from a transmission station of the second wireless system is received at a receiving station of the first wireless system. The receiving power estimation device comprises a correction means for correcting a receiving power estimate value of the second wireless signal at the first wireless system receiving station which is computed using an estimate value of path loss from the second wireless system transmission station to the first wireless system receiving station, said correction using a receiving power measurement value of the second wireless signal which is measured in a transmission station periphery sensor station which is a sensor station which is located in the periphery of the second wireless system transmission station.