Nippon Telegraph and Telephone Corporation

Shoko Shinohara

Yasuhiko Inoue

Masato Mizoguchi

Yasushi Takatori

Hirantha Abeysekera

Koichi Ishihara

Toshiro Nakahira

Riichi Kudo

Takafumi Hayashi

Akira Kishida

Tomoki Murakami

Takeo Ichikawa

Junichi Iwatani

Yusuke Asai

Munehiro Matsui

Kengo Nagata

Hayato Fukuzono

Daisuke Goto

Riku Omiya

Hirantha Sithira Abeysekera

A format that includes a BSSID of a transmitting station within a preamble of the frame is an HE format, and a format that does not include a BSSID within the preamble but includes a BSSID in a MAC header is a Non-HE format; and a wireless station in the BSS includes a control part which checks a format of a frame received at a predetermined receiver sensitivity or above, and continues demodulation of the received frame if the format is HE format and the BSSID in the received frame is consistent with its own BSS, and stops the demodulation of the received frame if the HE format and the BSSID in the received frame is not consistent with its own BSS.

Wireless communication system and wireless communication method

In a wireless communication system including a plurality of base stations to which terminal stations are connectable, and a monitoring station which monitors each of the base stations, the monitoring station includes an information collection unit configured to collect wireless environment information including a plurality of information items indicating wireless environments around the base stations and the terminal stations, from each of the base stations, a defect detection unit configured to detect whether or not one or more defects occur based on a combination of the information items, and a defect determination unit configured to determine estimated occurrence probabilities of the defects detected by the defect detection unit based on a combination of the information items.

Wireless communication system, monitoring station, defect detection method, and wireless communication program

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.

A wireless communication system includes a plurality of base stations to which terminal stations are connectable, and a base station control device controlling each of the base stations. The base station control device includes an information collection unit collecting wireless environment information indicating wireless environments around the base stations and the terminal stations from each of the base stations, and a policy calculation unit calculating a policy for connecting the base stations and the terminal stations based on the wireless environment information. Each of the base stations includes receiver receiving the calculated policy a destination calculation unit calculating a destination to which a terminal station left unaccommodated is to be connected based on the received policy, and a transmitter transmitting the received policy and the calculated destination to the terminal station. Each of the terminal stations determines a connection destination based on the transmitted policy and transition destination.

Wireless communication system, communication control method, and communication control program

A wireless communication system includes a plurality of base stations to which one or more terminal stations are connectable, and a base station control device controlling each of the plurality of base stations. The base station control device includes an information collection unit collecting connection information regarding the terminal stations connected to the base stations from each of the base stations, a list generation unit generating a white list indicating the terminal stations allowed to be connected to the base stations for each of the base stations based on the connection information, and a transmission unit configured to transmit the white list to each of the base stations. Each of the base stations includes a reception unit receiving the white list, and a setting unit performing setting so as to allow or inhibit connection of each of the terminal stations to the base station based on the received white list.

Wireless communication system, base station control device, communication control method, and communication control program

A base station () according to an embodiment includes a data processing unit () and a wireless signal processing unit (). The data processing unit () generates a MAC frame. The MAC frame includes input data and an identification bit (CB). The identification bit (CB) indicates that data is extended broadcast data. The wireless signal processing unit () converts the MAC frame into a wireless signal to distribute the wireless signal.

Utilizing wireless distribution content

A wireless performance evaluation method for performing wireless performance evaluation of a wireless network including wireless base stations and wireless terminal stations includes: before performing wireless performance evaluation operation based on wireless performance evaluation information generated from wireless performance evaluation conditions, determining whether an existing wireless performance evaluation result of wireless performance evaluation operation that has been performed is substitutable or not; and if the existing wireless performance evaluation result is substitutable, skipping arithmetic processing corresponding to the wireless performance evaluation information and substituting the existing wireless performance evaluation result.

Wireless performance evaluation method and wireless performance evaluation system

A wireless communication system includes a plurality of transmission devices configured to receive broadcast/multicast data transmitted from a broadcast/multicast data transmission device, convert the broadcast/multicast data into wireless frames, and broadcast/multicast the wireless frames to a plurality of reception devices, and the plurality of reception devices configured to receive the wireless frames broadcasted/multicasted from the plurality of transmission devices and acquire the broadcast/multicast data, and each of the plurality of transmission devices includes a broadcast/multicast transmission unit configured to generate the same wireless frame from the broadcast/multicast data and broadcast/multicast the generated wireless frame at the same transmission timing using the same MCS.

A wireless communication characteristic evaluation method for calculating a wireless communication characteristic of a wireless communication system in which a plurality of wireless communication terminals perform communication by transmitting or exchanging signals includes: an RSSI measurement step of measuring an RSSI measurement used for calculation of the wireless communication characteristic; and a calculation step of calculating the wireless communication characteristic based on the RSSI measurement and correction data of the RSSI measurement according to specifications of the wireless communication terminals or a correction calculation model.

Wireless communication characteristic evaluation method and wireless communication characteristic evaluation device

Provided is a wireless communication system that includes a transmission device configured to receives an input of group-addressed data transmitted from a specific source, convert the group-addressed data into wireless frames, and perform group-addressed transmission of the wireless frames; and a reception device configured to receive the wireless frames transmitted from the transmission device, and identify and receive the group-addressed data of the specific source, wherein a plurality of the transmission devices are provided, and each of the transmission devices is configured to perform group-addressed transmission of the wireless frames into which the group-addressed data is converted, and the reception device is configured to identify and receive the group-addressed data of the specific source from the wireless frames transmitted from the plurality of transmission devices, and perform diversity combining processing of combining the same pieces of group-addressed data.

Wireless communication system, and wireless communication method

In a wireless communication system including an intermediate processing device which performs processing between a plurality of base stations to which terminal stations are connectable and a base station control device which controls each of the base stations, the intermediate processing device includes an information collection unit configured to collect wireless environment information which includes information regarding the terminal stations connected to the base stations and which indicates wireless environments around the base stations and the terminal stations, from each of the base stations, a first conversion unit configured to convert the wireless environment information collected by the information collection unit into first information which is equally processable by the base station control device without distinction for each of the base stations, a transmission unit configured to transmit the first information to the base station control device, a reception unit configured to receive a parameter calculated by the base station control device based on the first information, and a second conversion unit configured to convert the parameter received by the reception unit into individual second information in accordance with each of the base stations, and each of the base stations includes a reception unit configured to receive the second information and a setting unit configured to perform setting so as to perform communication with each of the terminal stations based on the second information.

Wireless communication system, intermediate processing device, communication control method, and communication control program

There are provided a step 1 of, at a measurement point where a throughput of a wireless communication terminal under a new communication standard is to be acquired, measuring or calculating a wireless communication characteristic (throughput) of a wireless communication terminal under a current communication standard; a step 2 of acquiring parameters of a physical layer and a MAC layer at the time of measuring or calculating the wireless communication characteristic of the wireless communication terminal under the current communication standard; and a step 3 of, with the wireless communication characteristic (throughput) measured or calculated for the wireless communication terminal under the current communication standard and the parameters of the physical layer and the MAC layer at that time as inputs, calculating a wireless communication characteristic (throughput) corresponding to parameters of the wireless communication terminal under the new communication standard.

Wireless communication characteristic evaluation method

A data processing apparatus () according to an embodiment includes a data processing unit () and a wireless unit (). The wireless unit receives the data converted by the data processing unit and wirelessly transmits the input data to an access point. The data processing unit converts, when a remaining amount input from a battery () is in a first state, the input data with a first setting and outputs the converted data to the wireless unit. The data processing unit converts, when the remaining amount of the battery is in a second state different from the first state, the input data with a second setting and outputs the converted data to the wireless unit. A capacity per unit time of the data after conversion is different between the first setting and the second setting.

Data processing apparatus, data processing method, and data processing program

In a wireless communication system in which a plurality of wireless stations perform transmission on a shared frequency band, the wireless stations each include means for notifying a wireless station control apparatus of capability and environment information that includes information about capability of a local wireless station and information about a surrounding environment, and the wireless station control apparatus includes control means for selecting, based on capability and environment information collected from the wireless station, a frequency band to be used for the wireless station capable of using a plurality of frequency bands in accordance with a predetermined control index and setting the selected frequency band. Based on an area coverage rate of the wireless station as the control index, a frequency band with which an area coverage rate of the wireless station having an area coverage rate of less than or equal to a predetermined threshold is improved is selected.

Provided is a wireless communication system that includes a transmission device configured to receive an input of group-addressed data transmitted from a specific source, convert the group-addressed data into wireless frames, and perform group-addressed transmission of the wireless frames; and a reception device configured to receive the wireless frames transmitted from the transmission device, and identify and acquire the group-addressed data of the specific source. The transmission device includes coding means for defining a plurality of wireless frames as a frame block, performing error correction coding on the frame block, and performing group-addressed transmission of the frame block, and the reception device includes decoding means for identifying the frame block from the received wireless frames, performing error correction decoding in units of frame block, and reconfiguring the group-addressed data of the specific source.

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Yokosuka, Japan

Shoko Shinohara