公开(公告)号：US09237539B2

公开(公告)日：2016-01-12

申请号：US14089200

申请日：2013-11-25

Applicant: Electronics and Telecommunications Research Institute

Inventor： Hyun-jae Kim ,  Jung Hyun Kim ,  Jihyung Kim ,  Kwang Jae Lim ,  DongSeung Kwon

IPC: H04W56/00 ,  H04W84/18 ,  H04W4/00

CPC classification number: H04W56/0015 ,  H04W56/00 ,  H04W84/18

Abstract: In a wireless communication system formed of a plurality of nodes, an arbitrary node receives messages broadcasted from neighbor nodes and calculates amounts of changes in receiving times that are differences between receiving times when the messages are currently received and receiving times when the messages are previously received with respect to the neighbor nodes. The node corrects reference time thereof based on the amounts of changes calculated with respect to the neighbor nodes.

Abstract translation: 在由多个节点形成的无线通信系统中，任意节点接收从邻居节点广播的消息，并且计算接收时间的变化量，这当前消息当前被接收的接收时间和接收时间之间的差异 相对于邻居节点。 该节点基于相对于相邻节点计算出的改变量来校正其参考时间。

公开(公告)号：US09252901B2

公开(公告)日：2016-02-02

申请号：US14099192

申请日：2013-12-06

Applicant: Electronics and Telecommunications Research Institute

Inventor： Anseok Lee ,  Wooram Shin ,  Jihyung Kim ,  Hyun-jae Kim ,  Kwang Jae Lim ,  DongSeung Kwon

IPC: H04J3/06 ,  H04W4/00 ,  H04W56/00

CPC classification number: H04J3/0652 ,  H04W56/002

Abstract: A synchronization group management apparatus of a node recognizes a node belonging to a different group if groups having mobility are moved and located in the same area, and performs an operation of merging the different groups into one group by changing the frame start time and the synchronization reference time of the node.

Abstract translation: 如果具有移动性的组移动并位于同一区域中，则节点的同步组管理装置识别属于不同组的节点，并且通过改变帧开始时间和同步来执行将不同组合并成一组的操作 节点的参考时间。

公开(公告)号：US09209959B2

公开(公告)日：2015-12-08

申请号：US13851082

申请日：2013-03-26

Applicant: Electronics and Telecommunications Research Institute

Inventor： Jung Hyun Kim ,  Jihyung Kim ,  Hyun-jae Kim ,  Kwang Jae Lim ,  DongSeung Kwon

IPC: H04W56/00 ,  H04W4/08 ,  H04L7/00 ,  H04L27/00 ,  H04L27/26 ,  H04J3/06

CPC classification number: H04L7/0016 ,  H04L27/0014 ,  H04L27/2657 ,  H04L27/2675 ,  H04L2027/0065 ,  H04L2027/0095 ,  H04W56/0035

Abstract: A method and apparatus for synchronizing a carrier frequency of a node included in a distributed network are provided. The apparatus includes a frequency offset estimating unit, an offset average value calculating unit, and a frequency adjustment value calculating unit. The method includes receiving preambles from a plurality of nodes adjacent to the node, estimating offsets of the carrier frequencies from the received preambles for each of the plurality of neighbor nodes, calculating an average value of the estimated offsets, calculating an adjustment value of the carrier frequencies with respect to the entirety of the plurality of neighbor nodes by using the average value, and adjusting a carrier frequency of the node on the basis of the adjustment value.

Abstract translation: 提供了一种用于使包含在分布式网络中的节点的载波频率同步的方法和装置。 该装置包括频率偏移估计单元，偏移平均值计算单元和频率调整值计算单元。 该方法包括从邻近该节点的多个节点接收前导码，从多个相邻节点中的每一个的接收到的前同步码估计载波频率的偏移，计算估计的偏移的平均值，计算载波的调整值 通过使用平均值对多个相邻节点的整体进行频率的调整，并且基于调整值来调整节点的载波频率。