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：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：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：US12184436B2

公开(公告)日：2024-12-31

申请号：US17921418

申请日：2021-05-06

Applicant: NEC Communication Systems, Ltd.

Inventor： Akira Matsumoto ,  Yuki Baba ,  Katsuyuki Akizuki ,  Yuji Harada ,  Tetsuji Kawatsu

IPC: H04L12/12 ,  H04L12/40

Abstract: There is provided a network control apparatus that realizes an in-vehicle network with low power consumption. The network control apparatus comprises a vehicle state acquisition part that acquires the state of a vehicle; a control profile acquisition part that acquires a control profile, according to the acquired vehicle state, from one or more control profiles including settings for controlling equipment connected to an in-vehicle network; and a control part that controls equipment within the in-vehicle network on the basis of the acquired control profile.

公开(公告)号：US11510130B2

公开(公告)日：2022-11-22

申请号：US17050182

申请日：2019-04-24

Applicant: NEC COMMUNICATION SYSTEMS, LTD.

Inventor： Takumi Nomura ,  Tetsuji Kawatsu ,  Katsuyuki Akizuki ,  Yuji Harada ,  Akira Matsumoto ,  Yuki Baba

IPC: H04W40/24 ,  H04W4/48 ,  H04L12/40 ,  H04W40/20 ,  H04W40/28

Abstract: A car-loaded communication apparatus comprises: an acquisition part; and a selection part. The acquisition part acquires car information related to a state of a car in which a communication network is constructed inside, or an environment in which the car is placed. The selection part selects a communication route of a flow accommodating a transmission packet(s) from a plurality of communication routes included in the communication network, based on: the car information; and communication route information related to a communication route(s) included in the communication network.