Abstract: Provided is a wireless communication system in which, based on a random access scheme, a transmission opportunity (TXOP) acquired by a wireless access point is granted to a wireless station when performing uplink data transmission from the wireless station to the wireless access point and the TXOP acquired by the wireless station is granted to the wireless access point when performing downlink data transmission from the wireless access point to the wireless station, the system includes a scheduling unit for TXOP granting determining one or more wireless stations having a quality of an uplink data transmission lower than a prescribed value as TXOP responders to which the wireless access point grants the TXOP, and determining one or more wireless stations having a quality of a downlink data transmission lower than the prescribed value as TXOP holders which grant the TXOP to the wireless access point.

Abstract: Provided is a wireless communication system in which, based on a random access scheme, a transmission opportunity (TXOP) acquired by a wireless access point is granted to a wireless station when performing uplink data transmission from the wireless station to the wireless access point and the TXOP acquired by the wireless station is granted to the wireless access point when performing downlink data transmission from the wireless access point to the wireless station, the system includes a scheduling unit for TXOP granting determining one or more wireless stations having a quality of an uplink data transmission lower than a prescribed value as TXOP responders to which the wireless access point grants the TXOP, and determining one or more wireless stations having a quality of a downlink data transmission lower than the prescribed value as TXOP holders which grant the TXOP to the wireless access point.

Abstract: Provided is a wireless communication system in which, based on a random access scheme, a transmission opportunity (TXOP) acquired by a wireless access point is granted to a wireless station when performing uplink data transmission from the wireless station to the wireless access point and the TXOP acquired by the wireless station is granted to the wireless access point when performing downlink data transmission from the wireless access point to the wireless station, the system includes a scheduling unit for TXOP granting determining one or more wireless stations having a quality of an uplink data transmission lower than a prescribed value as TXOP responders to which the wireless access point grants the TXOP, and determining one or more wireless stations having a quality of a downlink data transmission lower than the prescribed value as TXOP holders which grant the TXOP to the wireless access point.

Abstract: Provided is a wireless communication system in which, based on a random access scheme, a transmission opportunity (TXOP) acquired by a wireless access point is granted to a wireless station when performing uplink data transmission from the wireless station to the wireless access point and the TXOP acquired by the wireless station is granted to the wireless access point when performing downlink data transmission from the wireless access point to the wireless station, the system includes a scheduling unit for TXOP granting determining one or more wireless stations having a quality of an uplink data transmission lower than a prescribed value as TXOP responders to which the wireless access point grants the TXOP, and determining one or more wireless stations having a quality of a downlink data transmission lower than the prescribed value as TXOP holders which grant the TXOP to the wireless access point.

Abstract: Provided is a wireless communication system in which, based on a random access scheme, a transmission opportunity (TXOP) acquired by a wireless access point is granted to a wireless station when performing uplink data transmission from the wireless station to the wireless access point and the TXOP acquired by the wireless station is granted to the wireless access point when performing downlink data transmission from the wireless access point to the wireless station, the system includes a scheduling unit for TXOP granting determining one or more wireless stations having a quality of an uplink data transmission lower than a prescribed value as TXOP responders to which the wireless access point grants the TXOP, and determining one or more wireless stations having a quality of a downlink data transmission lower than the prescribed value as TXOP holders which grant the TXOP to the wireless access point.

Abstract: A wireless user equipment performing wireless communication in a primary and a secondary frequency bands, a first wireless access point AP performing the wireless communication in the primary frequency band, and a second wireless base transceiver station BTS performing the wireless communication in the secondary frequency band are included. The AP and the BTS are connected to each other through a network. A UD report transfer unit transfers a UD report including information relating to transmission-waiting user data destined for a receiving node. The receiving node includes a transmission opportunity control unit which sets a fixed transmission prohibition time in a channel in the primary frequency band for a wireless communication device in a vicinity, obtains a transmission opportunity, grants the transmission opportunity to the transmitting node, and causes the user data to be transmitted from the transmitting node according to the transferred UD report.

Abstract: Provided is a wireless communication system in which, based on a random access scheme, a transmission opportunity (TXOP) acquired by a wireless access point is granted to a wireless station when performing uplink data transmission from the wireless station to the wireless access point and the TXOP acquired by the wireless station is granted to the wireless access point when performing downlink data transmission from the wireless access point to the wireless station, the system includes a scheduling unit for TXOP granting determining one or more wireless stations having a quality of an uplink data transmission lower than a prescribed value as TXOP responders to which the wireless access point grants the TXOP, and determining one or more wireless stations having a quality of a downlink data transmission lower than the prescribed value as TXOP holders which grant the TXOP to the wireless access point.

Abstract: Provided is a wireless communication system which performs downlink data transmission based on a transmission opportunity acquired by a wireless access point (hereinafter referred to as TXOP access) or a transmission opportunity acquired by a wireless station and granted to the wireless access point (hereinafter referred to as RXOP access), when performing the downlink data transmission from the wireless access point to the wireless station based on a random access scheme, in which the wireless access point includes a control unit performing, on a transmission buffer which sequentially stores data frames to be transmitted for each of wireless stations, processing which lowers an order of priority of the data frames which are to be destined for the wireless station A by the TXOP access at the transmission buffer according to a transmission status of the data frames destined for a wireless station A by the RXOP access.

Abstract: A wireless environment information collection system in which the wireless environment information management unit includes a unit which generates and outputs a channel measurement frame which determines the wireless stations performing stopping of communication over the first frequency channel for a fixed time, starting of measuring channel utilization of the first frequency channel, or both the stopping and the starting among the managed wireless stations, and the managed wireless stations include a unit which performs, at a time designated by the channel measurement frame from the wireless environment information management unit, the stopping of the communication over the first frequency channel, the measuring of the channel utilization of the first frequency channel, or both the stopping and the measuring, and which outputs the obtained wireless environment information to the wireless environment information management unit through the wired network or the wireless network.

Abstract: A wireless communication apparatus is provided that is capable of performing setting of a wireless LAN access point so that frequency utilization efficiency of an entire wireless communication system that includes wireless LAN access points of different manufacturers and different model numbers is improved.

Abstract: A wireless communication system includes a plurality of terminal apparatuses that perform communication using a first frequency band in which communication based on a random access scheme is performed and a second frequency band which is different from the first frequency band, a first base station apparatus that performs communication using the first frequency band, a second base station apparatus that performs communication using the second frequency band, and a cooperation control apparatus that selects a terminal apparatus that transmits user data via the first base station apparatus from among the plurality of terminal apparatuses based on information acquired by the first base station apparatus and the second base station apparatus.

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: Provided is a wireless communication system in which, based on a random access scheme, a transmission opportunity (TXOP) acquired by a wireless access point is granted to a wireless station when performing uplink data transmission from the wireless station to the wireless access point and the TXOP acquired by the wireless station is granted to the wireless access point when performing downlink data transmission from the wireless access point to the wireless station, the system includes a scheduling unit for TXOP granting determining one or more wireless stations having a quality of an uplink data transmission lower than a prescribed value as TXOP responders to which the wireless access point grants the TXOP, and determining one or more wireless stations having a quality of a downlink data transmission lower than the prescribed value as TXOP holders which grant the TXOP to the wireless access point.

Abstract: Provided is a wireless communication system which performs downlink data transmission based on a transmission opportunity acquired by a wireless access point (hereinafter referred to as TXOP access) or a transmission opportunity acquired by a wireless station and granted to the wireless access point (hereinafter referred to as RXOP access), when performing the downlink data transmission from the wireless access point to the wireless station based on a random access scheme, in which the wireless access point includes a control unit performing, on a transmission buffer which sequentially stores data frames to be transmitted for each of wireless stations, processing which lowers an order of priority of the data frames which are to be destined for the wireless station A by the TXOP access at the transmission buffer according to a transmission status of the data frames destined for a wireless station A by the RXOP access.

Abstract: A wireless environment information collection system in which the wireless environment information management unit includes a unit which generates and outputs a channel measurement frame which determines the wireless stations performing stopping of communication over the first frequency channel for a fixed time, starting of measuring channel utilization of the first frequency channel, or both the stopping and the starting among the managed wireless stations, and the managed wireless stations include a unit which performs, at a time designated by the channel measurement frame from the wireless environment information management unit, the stopping of the communication over the first frequency channel, the measuring of the channel utilization of the first frequency channel, or both the stopping and the measuring, and which outputs the obtained wireless environment information to the wireless environment information management unit through the wired network or the wireless network.

Abstract: In order to provide a wireless communication system capable of improving the throughput of wireless communication by effectively using frequency resources, in a wireless communication system in which a first wireless access point which communicates with one or more wireless stations within a first cell by orthogonal frequency-division multiple access and a second wireless access point which is capable of performing carrier sensing with the first wireless access point and communicates with one or more wireless stations within a second cell by the orthogonal frequency-division multiple access operate in cooperation with each other, the first wireless access point includes a transmission opportunity acquiring unit which acquires a transmission opportunity when data to be transmitted is generated; and a transmitting unit of permission for use which transmits permission for use of channels which are not scheduled to use within the first cell, to the second wireless access point in a period in which the transmissio

Abstract: There is provided a wireless communication system which can improve throughputs in wireless communication by effectively using frequency resources. In the wireless communication system including a plurality of wireless communication stations which may operate as wireless communication terminals or wireless base stations, the wireless communication station includes an access right acquisition means of acquiring an access right upon generating transmitting data; a determination means of determining whether or not different data destined to a plurality of wireless communication stations can be transmitted on different channels according to OFDMA; and a data transmitting means of transmitting data to the receivable wireless communication stations using OFDMA when the determination means determines that different data destined to a plurality of wireless communication stations can be transmitted on different channels.

Abstract: A wireless user equipment performing wireless communication in a primary and a secondary frequency bands, a first wireless access point AP performing the wireless communication in the primary frequency band, and a second wireless base transceiver station BTS performing the wireless communication in the secondary frequency band are included. The AP and the BTS are connected to each other through a network. A UD report transfer unit transfers a UD report including information relating to transmission-waiting user data destined for a receiving node. The receiving node includes a transmission opportunity control unit which sets a fixed transmission prohibition time in a channel in the primary frequency band for a wireless communication device in a vicinity, obtains a transmission opportunity, grants the transmission opportunity to the transmitting node, and causes the user data to be transmitted from the transmitting node according to the transferred UD report.

Abstract: A wireless communication system includes a plurality of terminal apparatuses that perform communication using a first frequency band in which communication based on a random access scheme is performed and a second frequency band which is different from the first frequency band, a first base station apparatus that performs communication using the first frequency band, a second base station apparatus that performs communication using the second frequency band, and a cooperation control apparatus that selects a terminal apparatus that transmits user data via the first base station apparatus from among the plurality of terminal apparatuses based on information acquired by the first base station apparatus and the second base station apparatus.

Abstract: In a system which performs wireless communication from an access point to stations using group identification information, the frequency of uses of group identification information that overlaps with that of another access point is reduced. An association between a station apparatus included in a group that is a target for simultaneous transmission and group identification information is stored, each station apparatus included in the group is notified of the group identification information, group identification information that is being used in the other access point apparatus is acquired, and if group identification information that is being used by the access point apparatus itself overlaps with the group identification information used by the other access point apparatus, the group identification information is changed so as to reduce the number of pieces of overlapping group identification information.