公开(公告)号：US11005524B2

公开(公告)日：2021-05-11

申请号：US16813937

申请日：2020-03-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Kumaran Vijayasankar ,  Timothy Schmidl ,  Ramanuja Vedantham

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

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.

公开(公告)号：US10903874B2

公开(公告)日：2021-01-26

申请号：US16552911

申请日：2019-08-27

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Kumaran Vijayasankar ,  Ramanuja Vedantham ,  Tarkesh Pande

IPC: H04B3/54

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：US20200274771A1

公开(公告)日：2020-08-27

申请号：US16812670

申请日：2020-03-09

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Ramanuja Vedantham ,  Kumaran Vijayasankar ,  Xiaolin Lu

IPC: H04L12/24 ,  H04B3/54 ,  H04B3/00 ,  H04B3/46

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：US10594360B2

公开(公告)日：2020-03-17

申请号：US14983136

申请日：2015-12-29

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Kumaran Vijayasankar ,  Timothy Schmidl ,  Ramanuja Vedantham

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

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.

公开(公告)号：US10574295B2

公开(公告)日：2020-02-25

申请号：US15898923

申请日：2018-02-19

Applicant: Texas Instruments Incorporated

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

IPC: H04B3/54

Abstract: Systems and methods for efficiently allocating beacon slot among multiple nodes on multiple levels within a power line communication network are described. In various implementations, these systems and methods may be applicable to Power Line Communications (PLC). For example, a method may include performing, by a communications device, assigning beacon transmission times to nodes within the communication device's network. The assigned beacon transmission times comprise a beacon slot and frame pattern. The beacon slot and frame pattern ensure that each node does not transmit a beacon in a beacon slot that is adjacent to a beacon slot assigned to a parent or child node. A beacon transmission slot is reserved for a base node in every frame. The frames may be organized into thirty-two-frame superframes, wherein each frame comprises a base node beacon slot and four switch node beacon slots.

公开(公告)号：US20190052716A1

公开(公告)日：2019-02-14

申请号：US16159265

申请日：2018-10-12

Applicant: TEXAS INSTRUMENTS INCORPORATED

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

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

Abstract: Disclosed embodiments include a network device having a split network stack that includes a physical (PHY) layer associated with first and second media access control (MAC) protocol sublayers, a processing device, and memory storing instructions that, when executed by the processing device, cause the processing device to select a route through the split network stack that includes one of the first and second MAC protocol sublayers but not the other one of the first and second MAC protocol sublayers.

公开(公告)号：US10135492B2

公开(公告)日：2018-11-20

申请号：US14072765

申请日：2013-11-05

Applicant: Texas Instruments Incorporated

Inventor： Kumaran Vijayasankar ,  Ramanuja Vedantham ,  Anuj Batra ,  Tarkesh Pande ,  Il Han Kim

IPC: H04B3/54 ,  H04L12/64

Abstract: In a method for communicating with a plurality of devices using different communication protocols, a signal is received at a transceiver device from a neighbor device via a physical layer of a communication media. At a first time the signal contains a header frame from a first device conforming to a first communication protocol and at another time the signal contains a header frame from a second device conforming to a second communication protocol. The transceiver determines which of the different communication protocols is being used by each of the plurality of devices. The transceiver may then process inbound payload data using the indentified protocol type. Data frames are transmitted to the first device using the first communication protocol and data frames are transmitted to the second device using the second communication protocol.

公开(公告)号：US09941929B2

公开(公告)日：2018-04-10

申请号：US14824506

申请日：2015-08-12

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：US09871630B2

公开(公告)日：2018-01-16

申请号：US14557858

申请日：2014-12-02

Applicant: Texas Instruments Incorporated

Inventor： Kumaran Vijayasankar ,  Ramanuja Vedantham ,  Anand G. Dabak ,  Badri N. Varadarajan ,  Il Han Kim ,  Xiaolin Lu

IPC: H04W72/04 ,  H04L5/00 ,  H04B3/54 ,  H04L25/02

CPC classification number: H04L5/0048 ,  H04B3/54 ,  H04B3/542 ,  H04B2203/5408 ,  H04B2203/5466 ,  H04B2203/5483 ,  H04B2203/5491 ,  H04L5/0044 ,  H04L5/0055 ,  H04L5/0078 ,  H04L5/0094 ,  H04L25/0272

Abstract: Systems and methods for designing, using, and/or implementing hybrid communication networks are described. In various embodiments, these systems and methods may be applicable to power line communications (PLC). For example, one or more of the techniques disclosed herein may include methods to coordinate medium-to-low voltage (MV-LV) and low-to-low voltage (LV-LV) PLC networks when the MV-LV network operates in a frequency subband mode and the LV-LV network operates in wideband mode (i.e., hybrid communications). In some cases, MV routers and LV routers may have different profiles. For instance, MV-LV communications may be performed using MAC superframe structures, and first-level LV to lower-level LV communications may take place using a beacon mode. Lower layer LV nodes may communicate using non-beacon modes. Also, initial scanning procedures may encourage first-to-second-level LV device communications rather than MV-to-first-level LV connections.

公开(公告)号：US09774421B2

公开(公告)日：2017-09-26

申请号：US14925030

申请日：2015-10-28

Applicant: Texas Instruments Incorporated

Inventor： Kumaran Vijayasankar ,  Tarkesh Pande ,  Ramanuja Vedantham

IPC: H04L1/00 ,  H04L12/801 ,  H04L1/08 ,  H03M13/09 ,  H04B3/54 ,  G06F11/10 ,  H03M13/15 ,  H04L1/16

CPC classification number: H04L1/005 ,  G06F11/1004 ,  H03M13/09 ,  H03M13/1515 ,  H04B3/542 ,  H04B3/544 ,  H04B2203/5408 ,  H04L1/0057 ,  H04L1/0061 ,  H04L1/0071 ,  H04L1/08 ,  H04L1/1607 ,  H04L47/10

Abstract: Embodiments of methods and systems are presented for handling PHY frames with multiple Reed-Solomon encoded blocks in PLC networks. A PHY frame is receive from a PLC device, the PHY frame comprising two or more Reed-Solomon encoded blocks. A first Reed-Solomon encoded block comprises a media access control (MAC) header. The first Reed-Solomon encoded block is decoded. An error-detection check is performed on the first decoded Reed-Solomon encoded block.