公开(公告)号：US20140233586A1

公开(公告)日：2014-08-21

申请号：US14264676

申请日：2014-04-29

Applicant: Texas Instruments Incorporated

Inventor： Shu Du ,  Robert W. Liang ,  Xiaolin Lu

IPC: H04L12/413 ,  H04B3/54 ,  H04L5/00

CPC classification number: H04L12/413 ,  H04B3/544 ,  H04L5/0096

Abstract: Systems and methods for carrier sense multiple access (CSMA) protocols for power line communications (PLC) are described. In some embodiments, a method may include performing a virtual carrier sensing operation and, in response to the virtual carrier sensing operation indicating that a communication channel is idle, calculating a contention window. The method may also include performing a physical carrier sensing operation subsequent to the virtual carrier sensing operation, the physical carrier sensing operation based, at least in part, upon the contention window. In response to the physical carrier sensing operation indicating that the communication channel is idle, the method may then include transmitting data over the channel. In other embodiments, another method may include determining that a data transmission is a unicast transmission and that an acknowledgement message has not been received. The method may further include incrementing a backoff parameter and repeating one or more carrier sense operations.

Abstract translation: 描述了用于电力线通信（PLC）的载波侦听多路访问（CSMA）协议的系统和方法。 在一些实施例中，方法可以包括执行虚拟载波侦听操作，并且响应于指示通信信道空闲的虚拟载波侦听操作，计算竞争窗口。 该方法还可以包括在虚拟载波感测操作之后执行物理载波感测操作，至少部分地基于竞争窗口进行物理载波感测操作。 响应于指示通信信道空闲的物理载波感测操作，该方法然后可以包括通过信道发送数据。 在其他实施例中，另一种方法可以包括确定数据传输是单播传输，还没有接收到确认消息。 该方法还可以包括增加退避参数并重复一个或多个载波检测操作。