公开(公告)号：US09198198B2

公开(公告)日：2015-11-24

申请号：US14254410

申请日：2014-04-16

Applicant: Texas Instruments Incorporated

Inventor： Ramanuja Vedantham ,  Kumaran Vijayasankar

IPC: H04B3/54 ,  H04W74/08

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.

Abstract translation: 如果通信信道在竞争窗口（CW）中与随机生成的数字成比例的退避时间之后通信信道为忙，则可以通过确定每个帧来执行使用载波侦听多址冲突避免（CSMA / CA）的通信信道上的传输。 当信道不忙时，可以发送一帧数据。 当信道繁忙时，设备可以在后续的退避时间周期性地确定通信信道是否正在占线。 使用公平协议对每个后续退避时间调整CW的值，其中CW的值增加，直到CW的值达到最大CW值; 然后持续CW的值，直到公平的退避次数达到公平阈值; 则CW的值逐渐减小，直到CW的值达到最小CW值。

公开(公告)号：US20150098569A1

公开(公告)日：2015-04-09

申请号：US14045960

申请日：2013-10-04

Applicant: Texas Instruments Incorporated

Inventor： Kumaran Vijayasankar ,  Ramanuja Vedantham ,  Tarkesh Pande

IPC: H04L9/30 ,  H04B3/54

CPC classification number: H04L63/123 ,  G06F15/177 ,  H04B3/54 ,  H04B3/542 ,  H04B2203/5408 ,  H04L9/0819 ,  H04L9/30 ,  H04L9/3242 ,  H04L63/0428 ,  H04L63/061 ,  H04L63/0876 ,  H04L2209/24

Abstract: Embodiments of the invention provide systems and methods for a cipher then segment approach in a Power Line Communication (PLC). A node or device generates frames to be transmitted to a destination node in the PLC network. A processor in the node is configured to generate a data payload comprising data to be sent to the destination node. The processor divides the data payload into two or more payload segments and encrypts the payload segments. The processor creates a frame for each of the encrypted payload segments, wherein each frame comprises a message integrity code. The processor creates a segment identifier for each frame using the message integrity code and an authentication key that is shared with the destination PLC node. The segment identifier is added to each frame.

公开(公告)号：US08826265B2

公开(公告)日：2014-09-02

申请号：US13659866

申请日：2012-10-24

Applicant: Texas Instruments Incorporated

Inventor： Ramanuja Vedantham ,  Kumaran Vijayasankar ,  Ramachandran Ananthakrishnan ,  Susan Yim

IPC: G06F9/44 ,  G06F9/445 ,  H04B3/54

CPC classification number: G06F8/654 ,  H04B3/542 ,  H04B2203/5408

Abstract: Systems and methods for implementing data concentrated initiated multicast firmware upgrade in power line communications (PLC) are described. In an illustrative embodiment, a method performed by a PLC device may include forming a group of PLC devices to receive a transmission of a data set, the group being organized according to a hierarchical structure, transmitting the data set to the group of PLC devices, determining whether a PLC device in the lowest level of the hierarchical structure is missing one or more portions of the data set, and retransmitting at least the missing portions of the data set until the lowest level of PLC devices each have the full data set.

Abstract translation: 描述了在电力线通信（PLC）中实现数据集中发起的组播固件升级的系统和方法。 在说明性实施例中，由PLC设备执行的方法可以包括：形成一组PLC设备，以接收数据集的传输，所述数据组的传输是根据层次结构组织的，将数据集发送到PLC设备组， 确定分层结构的最低级别的PLC设备是否缺少数据集的一个或多个部分，并且至少重传数据集的缺失部分，直到最低级别的PLC设备各自具有完整数据集。

公开(公告)号：US20130343403A1

公开(公告)日：2013-12-26

申请号：US13916879

申请日：2013-06-13

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Kumaran Vijayasankar ,  Ramanuja Vedantham ,  Tarkesh Pande

IPC: H04B3/54

CPC classification number: H04B3/54 ,  H04B3/542 ,  H04B2203/5408 ,  H04B2203/5416 ,  H04B2203/5433 ,  H04B2203/5445 ,  H04L1/1887

Abstract: Embodiments of methods and systems for transmitting and receiving segmented frames in a Power Line Communication (PLC) network are disclosed. A transmitter sends a first segment using CSMA/CA based on the priority of frame. All the other segments are transmitted using the CFS slot. When an ACK is received, transmitter sends the next segment after CFS. When a NACK is received, the transmitter sends just the last segment after CFS. If no ACK/NACK is received, the transmitter sends the last segment using CSMA/CA. If a NO_EARLIER_SEGMENTS delimiter is received, the transmitter sends the frame starting from the first segment using CSMA/CA. A receiver may send the NO_EARLIER_SEGMENTS delimiter when no earlier segments are in a receive buffer for reassembly. If the receiver is expecting to continue the reassembly of another frame when a segment is received, the receiver may transmit a BUSY_REASSEMBLY delimiter.

Abstract translation: 公开了用于在电力线通信（PLC）网络中发送和接收分段帧的方法和系统的实施例。 发射机根据帧的优先级使用CSMA / CA发送第一段。 所有其他段都使用CFS槽进行传输。 当接收到ACK时，发送器在CFS之后发送下一个段。 当接收到NACK时，发射机仅在CFS之后发送最后一个段。 如果没有接收到ACK / NACK，则发送器使用CSMA / CA发送最后一个段。 如果接收到NO_EARLIER_SEGMENTS分隔符，则发送器使用CSMA / CA从第一个分段开始发送帧。 当接收缓冲区中没有先前的段用于重新组装时，接收器可以发送NO_EARLIER_SEGMENTS分隔符。 如果接收器期望在接收到段时继续重新组合另一帧，则接收机可以发送BUSY_REASSEMBLY分隔符。

公开(公告)号：US20130322554A1

公开(公告)日：2013-12-05

申请号：US13910125

申请日：2013-06-05

Applicant: Texas Instruments Incorporated

Inventor： Kumaran Vijayasankar ,  Ramanuja Vedantham ,  Tarkesh Pande

IPC: H04B3/54

CPC classification number: H04B3/54 ,  H04B2203/5408 ,  H04B2203/5416 ,  H04B2203/5433 ,  H04B2203/5445

Abstract: Embodiments of methods and systems for supporting coexistence of multiple technologies in a Power Line Communication (PLC) network are disclosed. A long coexistence preamble sequence may be transmitted by a device that has been forced to back off the PLC channel multiple times. The long coexistence sequence provides a way for the device to request channel access from devices on the channel using other technology. The device may transmit a data packet after transmitting the long coexistence preamble sequence. A network duty cycle time may also be defined as a maximum allowed duration for nodes of the same network to access the channel. When the network duty cycle time occurs, all nodes will back off the channel for a duty cycle extended inter frame space before transmitting again. The long coexistence preamble sequence and the network duty cycle time may be used together.

公开(公告)号：US20130101003A1

公开(公告)日：2013-04-25

申请号：US13659536

申请日：2012-10-24

Applicant: Texas Instruments Incorporated

Inventor： Ramanuja Vedantham ,  Anand Dabak ,  Kumaran Vijayasankar

IPC: H04B3/46 ,  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：US11818048B2

公开(公告)日：2023-11-14

申请号：US17239244

申请日：2021-04-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Kumaran Vijayasankar ,  Suyash Jain

IPC: H04L47/127 ,  H04L43/0882

CPC classification number: H04L47/127 ,  H04L43/0882

Abstract: Aspects of the disclosure provide for a computer program product comprising computer executable instructions. The instructions are executable by a controller of a network device to cause the controller to analyze data transmitted by the network device via a network for a programmed amount of time, determine a data transmission pattern based on the analysis, determine, based on the transmission pattern, a volume of expected data transmission during a period of time, and determine whether to transmit additional data based on a relationship between the volume of expected data transmission during the period of time and a bandwidth allocation of the network device during the period of time.

公开(公告)号：US11765040B2

公开(公告)日：2023-09-19

申请号：US17521968

申请日：2021-11-09

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Ramanuja Vedantham ,  Kumaran Vijayasankar ,  Xiaolin Lu

IPC: H04L41/12 ,  H04B3/54 ,  H04B3/00 ,  H04B3/46

CPC classification number: H04L41/12 ,  H04B3/00 ,  H04B3/46 ,  H04B3/544

Abstract: An algorithm for the promotion of terminal nodes to switch nodes in a PLC network reduces overall network overhead and collisions, while ensuring the appropriate selection of a switch node and minimizing the number of levels in a PLC network. It also ensures that the terminal nodes with appropriate signal-to-noise ratios (SNRs) are promoted. It is desirable to have a network with fewer levels. The disclosed approach favors the nodes that are closer to the DC to promote them as switch nodes. This is achieved by waiting for a smaller number of PNPDUs for a node that is closer to the DC in comparison to a node that is farther away from the DC.

公开(公告)号：US11722174B2

公开(公告)日：2023-08-08

申请号：US17119831

申请日：2020-12-11

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Kumaran Vijayasankar ,  Ramanuja Vedantham ,  Tarkesh Pande

IPC: H04B3/54

CPC classification number: H04B3/54 ,  H04B2203/5408 ,  H04B2203/5416 ,  H04B2203/5433 ,  H04B2203/5445

Abstract: Embodiments of methods and systems for supporting coexistence of multiple technologies in a Power Line Communication (PLC) network are disclosed. A long coexistence preamble sequence may be transmitted by a device that has been forced to back off the PLC channel multiple times. The long coexistence sequence provides a way for the device to request channel access from devices on the channel using other technology. The device may transmit a data packet after transmitting the long coexistence preamble sequence. A network duty cycle time may also be defined as a maximum allowed duration for nodes of the same network to access the channel. When the network duty cycle time occurs, all nodes will back off the channel for a duty cycle extended inter frame space before transmitting again. The long coexistence preamble sequence and the network duty cycle time may be used together.

公开(公告)号：US11700033B2

公开(公告)日：2023-07-11

申请号：US17316789

申请日：2021-05-11

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Kumaran Vijayasankar ,  Timothy Schmidl ,  Ramanuja Vedantham

IPC: H04B1/7143 ,  H04B1/715 ,  H04W16/14 ,  H04B1/713

CPC classification number: H04B1/7143 ,  H04B1/713 ,  H04B1/715 ,  H04B2001/7154 ,  H04W16/14

Abstract: A system and method for enhanced channel hopping sequence is described. A pseudo random channel hopping sequence is redistributed using certain system specific parameters for separating adjacent transmission channels within a predetermined number of consecutive transmission channel numbers in the random channel hopping sequence to improve inter-channel interference between adjacent transmission channels.