Abstract: Provided is a wireless base station which uses distributed antennas and selects a combination of a plurality of wireless terminals and the distributed antennas of a wireless base station that performs multi-user transmission with respect to the plurality of wireless terminals in a multi-BSS wireless environment. The wireless base station includes: a scheduling unit that measures reception power (RSSI) from each wireless terminal at each of the distributed antennas and selects a combination of a plurality of wireless terminals and a plurality of antennas having approximately the same RSSIs in descending order for respective wireless terminals; and a transmission power control unit that sets minimum transmission power corresponding to the RSSI of the antenna when multi-user transmission is performed between the plurality of wireless terminals and the plurality of antennas combined by the scheduling unit.

Abstract: An AP and UE, which perform access control using CSMA/CA, perform a step judging an exposed level in transmission of the AP based on a congesting level in transmission, which is caused by a wireless station in defer transmission that is in a neighborhood of the AP; a step judging an exposed level in reception of the UE based on a congesting level in reception, which is caused by a wireless station in defer transmission that is in a neighborhood of the UE; and a step performing control which changes a channel of the AP, when the exposed level in transmission cannot satisfy expected quality of the AP, and performing control which changes a connected AP of the UE, or control which changes to other network, when the exposed level in transmission or in reception cannot satisfy required quality of the UE or the expected quality of the AP.

Abstract: Included are n antenna sets; n antenna switch units; n signal change units each changing a combination of one or more of a phase, a timing, a frequency, and a power of each signal transmitted/received in n antennas being selected from the antenna sets; a notification unit outputting a notification signal, in which control information on the antenna switch units and the signal change units according to a target terminal being a destination/source of the signals transmitted/received in the n antennas, are arranged according to a switch time of each of the antenna switch units and a change time of each of the signal change units; and a control unit sequentially starting control of switching by each of the antenna switch units and control of changing by each of the signal change units in order in which the control information on the each unit in the notification signal is notified.

Abstract: [Problem] A base station includes a plurality of radio communication units individually supporting a plurality of communication capabilities, and controls a terminal station to be connected with the base station to select a radio communication unit according to a communication scheme of the terminal station. [Solution] Provided is a radio communication method of a radio communication system. The radio communication system includes a plurality of base stations mounted with a plurality of radio communication units for which different communication schemes are settable, a terminal station configured to perform radio communication in a certain communication scheme, and a centralized control station configured to control the plurality of base stations.

Abstract: [Problem] The base station includes a plurality of radio communication units configured to individually support a plurality of communication capabilities, and performs, for a terminal station that is connected to the base station, control for selecting a radio communication unit based on a communication scheme supported in the terminal station. [Solution] Provided is a radio communication method for a radio communication system including a plurality of base stations provided with a plurality of radio communication units for which different communication schemes are settable, and a terminal station configured to perform radio communication with the radio communication unit of the base station by using a specific communication scheme.

Abstract: Provided is a wireless communication control method, in which a management server manages line selection of an unlicensed band/licensed band of a UE and manages parameters of the unlicensed band, including a control step of excluding the UE that uses the licensed band from an optimization target in an unlicensed band system and optimizing the parameters of the unlicensed band in consideration of existence of an STA and the UE that uses the unlicensed band, which is caused by the management server. Furthermore, a pattern when a total of a communication capacity in the unlicensed band and a communication capacity in the licensed band after the optimization of the parameters of the unlicensed band becomes high is adopted for the line selection of the UE, and the parameters of the unlicensed band after the optimization of the line selection are set for an AP, the STA, and the UE of the unlicensed band.

Abstract: Provided are n antennas and n power change units; a power control unit; a power change management unit managing a common power change amount and an individual power change amount; a common power notification unit notifying the power control unit of the common power change amount in accordance with a target terminal; an individual power notification unit notifying the power control unit in advance of the individual power change amount in accordance with the each terminal at a prescribed timing, in which the power control unit stores the individual power change amount in a storage unit, and performs control of power changing by adding up the common power change amount in accordance with the target terminal, which is notified from the common power notification unit, and the individual power change amount.

Abstract: Provided is a wireless environment evaluation method including a step 1 acquiring a transmission and reception history of wireless signals transmitted and received between the plurality of wireless stations and acquiring or estimating a number of wireless stations in transmission standby, based on the transmission and reception history; a step 2 calculating a normal reception rate S in a congesting situation in reception according to the number of wireless stations in transmission standby; a step 3 acquiring a normal reception rate S? of the wireless signals per a fixed channel use time from the transmission and reception history in the prescribed wireless station; and a step 4 determining a degree of the exposed situation in reception according to a ratio of the normal reception rate S? to the normal reception rate S.

Abstract: An AP and UE, which perform access control using CSMA/CA, perform a step judging an exposed level in transmission of the AP based on a congesting level in transmission, which is caused by a wireless station in defer transmission that is in a neighborhood of the AP; a step judging an exposed level in reception of the UE based on a congesting level in reception, which is caused by a wireless station in defer transmission that is in a neighborhood of the UE; and a step performing control which changes a channel of the AP, when the exposed level in transmission cannot satisfy expected quality of the AP, and performing control which changes a connected AP of the UE, or control which changes to other network, when the exposed level in transmission or in reception cannot satisfy required quality of the UE or the expected quality of the AP.

Abstract: The each AP includes a control unit that detects, as the wireless environment information, a signal detection level for one or more neighboring APs positioned in the neighborhood of the AP and notifies the detected signal detection level to the central coordinator, and controls the ATT value by the setting in the central coordinator; and the central coordinator includes a parameter calculation unit that calculates the ATT value for each the APs, based on the signal detection level for each the neighboring wireless access point notified from the plurality of APs and based on an RSSI threshold at which each the APs is able to secure a prescribed service area.

Abstract: Included are n antenna sets; n antenna switch units; n signal change units each changing a combination of one or more of a phase, a timing, a frequency, and a power of each signal transmitted/received in n antennas being selected from the antenna sets; a notification unit outputting a notification signal, in which control information on the antenna switch units and the signal change units according to a target terminal being a destination/source of the signals transmitted/received in the n antennas, are arranged according to a switch time of each of the antenna switch units and a change time of each of the signal change units; and a control unit sequentially starting control of switching by each of the antenna switch units and control of changing by each of the signal change units in order in which the control information on the each unit in the notification signal is notified.

Abstract: Provided are n antennas and n power change units; a power control unit; a power change management unit managing a common power change amount and an individual power change amount; a common power notification unit notifying the power control unit of the common power change amount in accordance with a target terminal; an individual power notification unit notifying the power control unit in advance of the individual power change amount in accordance with the each terminal at a prescribed timing, in which the power control unit stores the individual power change amount in a storage unit, and performs control of power changing by adding up the common power change amount in accordance with the target terminal, which is notified from the common power notification unit, and the individual power change amount.