公开(公告)号：US20180368184A1

公开(公告)日：2018-12-20

申请号：US16112254

申请日：2018-08-24

Applicant: Texas Instruments Incorporated

Inventor： Kumaran Vijayasankar ,  Jyothsna Kunduru

IPC: H04W74/08 ,  H04L5/00 ,  H04W4/80 ,  H04B1/713

Abstract: A method of channel access for a radio device in an asynchronous channel hopping wireless network. A backoff time is set from an Interference Avoidance Delay plus a random backoff time for transmissions from the radio device. For initial frame transmissions, an initial value for a number of backoffs (nb) and initial number of preamble detection backoffs (npdb) is set. After waiting for expiring of the initial backoff time and provided a current npdb_value

公开(公告)号：US10104192B2

公开(公告)日：2018-10-16

申请号：US14516168

申请日：2014-10-16

Applicant: Texas Instruments Incorporated

Inventor： Xiaolin Lu ,  Robert Liang ,  Mehul Soman ,  Kumaran Vijayasankar ,  Ramanuja Vedantham

IPC: H04L29/04 ,  H04L29/08 ,  H04W4/20 ,  H04W80/02

Abstract: A communication system and method includes receiving payload data of first and second media access control (MAC) frames. A MAC-level protocol is identified in response to the indication of the selected network for each of the first and second MAC frames. The payload data of the first and second MAC frames is transmitted and/or received across respective networks transmitted using, for example, power line communications signals over a common communications medium. The common communications medium is operable for carrying signals of a plurality of networks.

公开(公告)号：US09872246B2

公开(公告)日：2018-01-16

申请号：US15007221

申请日：2016-01-27

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Kumaran Vijayasankar ,  Arvind Kandhalu Raghu ,  Ramanuja Vedantham

IPC: H04L12/50 ,  H04W52/02 ,  H04B1/713

CPC classification number: H04W52/0209 ,  H04B1/713 ,  H04W52/0216 ,  H04W52/0219 ,  H04W52/0229 ,  Y02B70/30 ,  Y02D70/144 ,  Y02D70/40

Abstract: Power conservation is provided in a network of globally unsynchronized wireless communication devices that use asynchronous channel hopping. Each wireless communication device defines its own channel hopping schedule. The channel hopping schedules include channel hop intervals when the device's receiver is active for receiving transmissions, and sleep intervals when the receiver is in a low power sleep state. Parameters associated with the sleep intervals are defined by each wireless communication device independently of external constraint.

公开(公告)号：US09712356B2

公开(公告)日：2017-07-18

申请号：US15007224

申请日：2016-01-27

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Kumaran Vijayasankar ,  Timothy M. Schmidl ,  Ramanuja Vedantham

IPC: H03C3/00 ,  H04L27/12 ,  H04L27/00 ,  H04B1/707 ,  H04L29/06 ,  H04L27/26

CPC classification number: H04L27/12 ,  H04B1/707 ,  H04L1/007 ,  H04L1/0072 ,  H04L1/0086 ,  H04L27/0008 ,  H04L27/2601 ,  H04L69/22

Abstract: A wireless transmission having a header and a payload is sent by transmitting a preamble of the header with a first modulation, wherein the preamble carries a coded modulation indicator. The payload and a remainder of the header are transmitted with a modulation associated with the coded modulation indicator. When the transmission is received, the preamble is demodulated in accordance with the first modulation. The coded modulation indicator is then decoded, and the payload and the remainder of the header are demodulated in accordance with the modulation indicated by the decoded modulation indicator.

公开(公告)号：US09596325B2

公开(公告)日：2017-03-14

申请号：US14556373

申请日：2014-12-01

Applicant: Texas Instruments Incorporated

Inventor： Gang Xu ,  Ramanuja Vedantham ,  Kumaran Vijayasankar ,  Anand G. Dabak ,  Tarkesh Pande ,  Il Han Kim ,  Xiaolin Lu

IPC: H04J3/24 ,  H04L29/06 ,  H04B3/54

CPC classification number: H04L69/22 ,  H04B3/54 ,  H04B3/542 ,  H04B2203/5408

Abstract: A physical layer (PHY) data frame for use in conjunction with processor in a node, processor coupled to a program memory for storing a sequence of operating instructions. The frame has a preamble, PHY header, a MAC header and a MAC payload. The PHY header includes a destination address field having a destination address therein. The destination address is used by the processor to determine match with the node address.

Abstract translation: 与节点中的处理器结合使用的物理层（PHY）数据帧，耦合到程序存储器的处理器，用于存储操作指令序列。 帧具有前同步码，PHY报头，MAC报头和MAC有效载荷。 PHY标头包括其中具有目的地地址的目的地地址字段。 处理器使用目的地地址来确定与节点地址的匹配。

公开(公告)号：US20170063843A1

公开(公告)日：2017-03-02

申请号：US15222524

申请日：2016-07-28

Applicant: Texas Instruments Incorporated

Inventor： Kumaran Vijayasankar ,  Oliver Shih ,  Arvind K. Raghu ,  Ramanuja Vedantham ,  Xiaolin Lu

IPC: H04L29/06 ,  H04L9/32

CPC classification number: H04L63/0823 ,  H04L9/3268 ,  H04L63/0428 ,  H04L63/0435 ,  H04L63/0442 ,  H04L63/062 ,  H04L63/0884

Abstract: Authentication of a networked device with limited computational resources for secure communications over a network. Authentication of the device begins with the supplicant node transmitting a signed digital certificate with its authentication credentials to a proxy node. Upon verifying the certificate, the proxy node then authenticates the supplicant's credentials with an authentication server accessible over the network, acting as a proxy for the supplicant node. Typically, this verification includes decryption according to a public/private key scheme. Upon successful authentication, the authentication server creates a session key for the supplicant node and communicates it to the proxy node. The proxy node encrypts the session key with a symmetric key, and transmits the encrypted session key to the supplicant node which, after decryption, uses the session key for secure communications. In some embodiments, the authentication server encrypts the session key with the symmetric key.

Abstract translation: 用于通过网络进行安全通信的有限计算资源的网络设备的认证。 设备的认证开始于请求者节点向代理节点发送具有其认证凭证的签名数字证书。 在验证证书后，代理节点然后通过网络可访问的认证服务器来认证请求方的凭据，充当请求方节点的代理。 通常，该验证包括根据公共/私人密钥方案的解密。 成功认证后，认证服务器为请求方节点创建会话密钥，并将其与代理节点进行通信。 代理节点用对称密钥加密会话密钥，并将加密的会话密钥发送给请求方节点，该请求者节点在解密之后使用会话密钥进行安全通信。 在一些实施例中，认证服务器用对称密钥加密会话密钥。

公开(公告)号：US20170063685A1

公开(公告)日：2017-03-02

申请号：US15249716

申请日：2016-08-29

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Ramanuja Vedantham ,  Kumaran Vijayasankar ,  Arvind K. Raghu ,  Ariton E. Xhafa

IPC: H04L12/741

CPC classification number: H04L45/48 ,  H04L45/02 ,  H04L61/2007

Abstract: This invention is an improvement of a Hierarchical Do-Dag based RPL (H-DOC) network configuration where the network address of each node corresponds to its location within the hierarchical network. Network addresses are initialized hierarchically. Candidate patent nodes signal availability. Candidate child nodes respond to a selected candidate parent node with a temporary address. The selected candidate parent node acknowledges selection and communicates a hierarchical address for the child node in a transmission to the temporary address. The child node changes its address to the hierarchical address from the parent node. When a node switches parent nodes, it signals the old parent node to deallocate it as a child node, and then signals a selected candidate parent node with a temporary address.

Abstract translation: 本发明是基于分层Do-Dag的RPL（H-DOC）网络配置的改进，其中每个节点的网络地址对应于其在分层网络内的位置。 网络地址被分层初始化。 候选专利节点信号可用性。 候选子节点使用临时地址响应所选择的候选父节点。 选择的候选父节点确认选择，并将传输中的子节点的分层地址传送到临时地址。 子节点将其地址从父节点更改为分层地址。 当节点切换父节点时，它向旧的父节点发信号，将其解除分配为子节点，然后用临时地址发送选定的候选父节点。

公开(公告)号：US09584185B2

公开(公告)日：2017-02-28

申请号：US13659536

申请日：2012-10-24

Applicant: Texas Instruments Incorporated

Inventor： Ramanuja Vedantham ,  Anand Dabak ,  Kumaran Vijayasankar

IPC: H02J1/00 ,  H02J3/00 ,  H04B3/54

CPC classification number: H04B3/54 ,  H04B2203/5408 ,  H04B2203/542 ,  H04B2203/5433

Abstract: Systems and methods for relative phase detection and zero crossing detection for power line communications (PLC) are described. In some embodiments, both transmit and receive PLC devices detect a zero crossing on an AC mains phase. The devices start a phase detection counter (PDC) by generating a zero crossing pulse within 5% of the actual zero crossing time. When a frame is transmitted, the transmitting device includes a PDC value in the frame control header (FCH). The PDC value corresponds to the start time of the FCH. When the frame is received at the receive PLC device, the receive PLC device measures a local PDC value between the zero crossing and the start of the FCH. The receive device compares the local PDC value to the PDC value in the FCH of the received frame and determines if the devices are on the same phase.

Abstract translation: 描述了用于电力线通信（PLC）的相对相位检测和零交叉检测的系统和方法。 在一些实施例中，发送和接收PLC设备都检测AC电源相位上的过零点。 器件通过在实际过零时间的5％内产生过零脉冲来启动相位检测计数器（PDC）。 当发送帧时，发送装置在帧控制报头（FCH）中包括PDC值。 PDC值对应于FCH的开始时间。 当在接收PLC设备处接收到帧时，接收PLC设备测量过零点和FCH开始之间的本地PDC值。 接收设备将本地PDC值与接收帧的FCH中的PDC值进行比较，并确定设备是否处于同一相位。

公开(公告)号：US09531563B2

公开(公告)日：2016-12-27

申请号：US14949069

申请日：2015-11-23

Applicant: Texas Instruments Incorporated

Inventor： Ramanuja Vedantham ,  Kumaran Vijayasankar

IPC: H04L12/413 ,  H04W74/08 ,  H04B3/54 ,  H04L1/00 ,  H04L5/00

CPC classification number: H04L12/413 ,  H04B3/54 ,  H04B2203/5408 ,  H04B2203/5425 ,  H04L1/0002 ,  H04L5/0007 ,  H04W74/0816

Abstract: Transmission over a communication channel using carrier sense multiple access collision avoidance (CSMA/CA) may be performed by determining for each frame if the communication channel is busy after a backoff time proportional to a randomly generated number within a contention window (CW). When the channel is not busy, a frame of data may be transmitted. When the channel is busy, the device may periodically determine if the communication channel is busy after subsequent backoff times. The value of CW is adjusted for each subsequent backoff time using a fairness protocol, in which the value of CW is increased until the value of CW reaches a maximum CW value; and then the value of CW is held until a fairness number of backoff repetitions reaches a fairness threshold; then the value of CW is reduced incrementally until the value of CW reaches a minimum CW value.

公开(公告)号：US20160330713A1

公开(公告)日：2016-11-10

申请号：US15009279

申请日：2016-01-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Kumaran Vijayasankar

IPC: H04W72/00

CPC classification number: H04W72/005 ,  H04W84/18

Abstract: A method of operating a mesh network is disclosed. The method includes joining a network as a child of a parent node and receiving a downlink broadcast channel from the parent node. The method further includes setting the downlink broadcast channel as an uplink broadcast channel in response to the step of receiving.

Abstract translation: 公开了一种操作网状网络的方法。 该方法包括将网络作为父节点的子节点并从父节点接收下行广播信道。 该方法还包括响应于接收步骤，将下行链路广播信道设置为上行链路广播信道。