公开(公告)号：US10356844B2

公开(公告)日：2019-07-16

申请号：US15503140

申请日：2015-08-03

Applicant: NEC Communication Systems Ltd.

Inventor： Akira Matsumoto ,  Peng Shao ,  Yuki Baba

IPC: H04W88/02 ,  H04L12/413 ,  H04W28/12 ,  H04W72/08 ,  H04W84/12 ,  H04W74/08

Abstract: A communication device includes a wireless communication unit, an in-transmission information generating unit, and a neighboring signal presence information generating unit. The wireless communication unit transmits and receives wireless frames via an antenna. The in-transmission information generating unit generates in-transmission information representing whether or not a wireless frame is being transmitted from the antenna. The neighboring signal presence information generating unit generates neighboring signal presence information representing whether or not a signal of a predetermined level or higher is present on a wireless channel that is the same as a wireless channel of the wireless frame. The collision detection unit determines a transmission end point of the wireless frame transmitted from the wireless communication unit based on the in-transmission information, determines whether or not there is a signal of the predetermined level or higher on the wireless channel through which the wireless frame is transmitted within a period from the determined transmission end point until a first time elapses, based on the neighboring signal presence information, and determines whether or not the transmitted wireless frame collided with another wireless frame, based on the determination made based on the neighboring signal presence information.

公开(公告)号：US10165603B2

公开(公告)日：2018-12-25

申请号：US15032149

申请日：2014-09-05

Applicant: NEC Communication Systems, Ltd

Inventor： Peng Shao ,  Akira Matsumoto ,  Ikumi Wada ,  Yuki Baba

IPC: H04W4/00 ,  H04W74/08 ,  H04L29/06 ,  H04L29/08 ,  H04W24/08 ,  H04L1/00 ,  H04W52/28 ,  H04L5/00 ,  H04W52/26 ,  H04W84/12

Abstract: A transmission part transmits a packet by radio. A power detection part performs, at a given cycle, sampling of power of a spatial radio signal in a packet transmission period during which the transmission part transmits the packet. A collision detection part calculates, as an index value, at least one of the average value and the degree of variation of power of the spatial radio signal in the packet transmission period on the basis of sampled data obtained in the sampling by the power detection part. The collision detection part also determines a reference value on the basis of transmission power of the packet. The collision detection part detects whether or not collision of the packet is present by comparing the index value with the reference value.

公开(公告)号：US10244558B2

公开(公告)日：2019-03-26

申请号：US15119020

申请日：2014-08-14

Applicant: NEC Communication Systems, Ltd

Inventor： Yuki Baba ,  Akira Matsumoto ,  Peng Shao

IPC: H04W74/08 ,  H04L12/413

Abstract: A wireless communication terminal has: a wireless module part which transmits a radio frame signal; a transmission loss information detection part which detects transmission loss information representing whether or not the radio frame signal transmitted by the wireless module part has reached a transmission destination; a collision information detection part which detects collision information representing an aspect of collision between the radio frame signal transmitted by the wireless module part and another radio frame signal; and a transmission control part which controls a transmission process executed by the wireless module part, on a basis of the transmission loss information and the collision information.

公开(公告)号：US09030945B2

公开(公告)日：2015-05-12

申请号：US14505815

申请日：2014-10-03

Applicant: NEC Communication Systems, Ltd.

Inventor： Peng Shao ,  Stefan Aust ,  Akira Matsumoto ,  Tetsuya Ito ,  Peter Davis

IPC: H04W24/06 ,  H04W24/02 ,  H04L12/24 ,  H04L12/26 ,  H04W88/02 ,  H04W74/08

CPC classification number: H04W24/06 ,  H04L41/0654 ,  H04L43/0805 ,  H04W24/02 ,  H04W74/0825 ,  H04W88/02

Abstract: A wireless communication device includes a data transmission and reception section that wirelessly transmits a plurality of test packets; a signal sensing section that senses a power of a spatial radio wave signal on a frequency channel that is the same as the plurality of test packets and outputs sample data of the sensed spatial radio wave signal; a calculation processing section that converts the sample data into time series sample data; a collision detection section that calculates a packet collision rate based on the number of packet collisions and the number of the plurality of test packets if there is a packet collision due to interference of the plurality of test packets with another communication; and a control section that adjusts a parameter that the data transmission and reception section uses based on a calculation result of the collision detection section.

Abstract translation: 无线通信装置包括无线发送多个测试分组的数据发送接收部; 信号感测部，其感测与所述多个测试分组相同的频率信道上的空间无线电波信号的功率，并输出所感测的空间无线电波信号的采样数据; 计算处理部分，将样本数据转换为时间序列样本数据; 冲突检测部分，如果由于所述多个测试分组与另一通信的干扰而存在分组冲突，则基于分组冲突的数量和所述多个测试分组的数量来计算分组冲突率; 以及控制部，其基于所述碰撞检测部的计算结果来调整所述数据发送接收部使用的参数。