公开(公告)号：US20180035467A1

公开(公告)日：2018-02-01

申请号：US15551430

申请日：2016-02-23

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Riichi KUDO ,  Hirantha Sithira ABEYSEKERA ,  Yasushi TAKATORI ,  Takeo ICHIKAWA ,  Masato MIZOGUCHI ,  Yasufumi MORIOKA ,  Hiroto YASUDA ,  Akira YAMADA ,  Yoshifumi MORIHIRO ,  Yukihiko OKUMURA

IPC: H04W74/08 ,  H04W72/04

CPC classification number: H04W74/0833 ,  H04W4/00 ,  H04W16/14 ,  H04W72/04 ,  H04W72/0406 ,  H04W72/044 ,  H04W84/12 ,  H04W92/20

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.

公开(公告)号：US20190059107A1

公开(公告)日：2019-02-21

申请号：US16078700

申请日：2017-02-23

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Akiyoshi INOKI ,  Hirantha Sithira ABEYSEKERA ,  Munehiro MATSUI ,  Takeo ICHIKAWA ,  Masato MIZOGUCHI ,  Akira KISHIDA ,  Daisuke KOIZUMI ,  Akira YAMADA ,  Yoshifumi MORIHIRO ,  Takahiro ASAI

IPC: H04W74/08 ,  H04W24/08 ,  H04W24/06 ,  H04W28/02 ,  H04W16/22

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.