Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and device for time synchronization in a tdma multi-hop wireless network

一种设备、外同步的技术，应用在通信网络领域，能够解决同步方法未满足TDMA协议有限延迟和低开销的要求等问题，达到高精度、实现时钟同步的效果

Inactive Publication Date: 2009-12-30
INTERDIGITAL CE PATENT HLDG
View PDF4 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synchronization method disclosed in this prior Fraunhofer PCT patent application does not meet the TDMA protocol's requirements for bounded delay and low overhead, and is not suitable for multi-hop wireless environments

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for time synchronization in a tdma multi-hop wireless network
  • Method and device for time synchronization in a tdma multi-hop wireless network
  • Method and device for time synchronization in a tdma multi-hop wireless network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0071]For example, the method according to the invention can be used in a multi-hop wireless network consisting of N nodes. In one embodiment, some of these nodes are time reference (TR) nodes. TR nodes are synchronized to a common time reference through out-of-band synchronization mechanisms such as GPS (Global Positioning System) devices and atomic clocks. The purpose of the synchronization algorithm of the present invention is to keep the clocks of all nodes in the network synchronized with the time reference of the TR nodes. The algorithm utilizes the slotted structure of the TDMA protocol to achieve precise synchronization and minimize communication overhead. This algorithm is performed during a Synchronous Control Subframe (SCS) which is part of a Control Subframe. The main idea is: a TR node triggers synchronization by sending a broadcast beacon in the first slot of the SCS, and makes the rest of the nodes quickly propagate the beacon to the network, while the rest of...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention concerns a method for synchronizing clocks of a set of nodes in a TDMA (''Time Division Multiple Access'') communication network comprising a plurality of nodes, among which some called time reference (TR) nodes are synchronized to a common time reference through a predetermined out-of-band synchronization mechanism, other nodes being called non-TR nodes, each node comprising an internal clock, characterized in that it comprises the steps of: transmitting, at the level of at least one of said TR nodes, a broadcast beacon packet during a given time slot of sub-frames, each sub-frame comprising a plurality of time slots ; propagating among the remaining nodes said beacon packet using the slotted structure of the TDMA protocol, each node being pre-assigned a conflict-free time slot in a sub-frame to broadcast said beacon packet received from another node in a previous slot of said sub-frame; and updating in at least two of said non-TR nodes the internal clock based on an updated offset estimate, upon reception of said beacon packet. The invention also concerns a communication device in a TDMA communication network.

Description

technical field [0001] The present invention relates to the field of communication networks. [0002] More specifically, the invention relates to TDMA ("Time Division Multiple Access") multi-hop wireless networks. Background technique [0003] In a multi-hop wireless network, a group of nodes equipped with wireless interfaces forms a network infrastructure in which data is forwarded to an intended destination over a number of wireless hops. The multi-hop wireless communication paradigm was originally used in military applications, such as ad hoc networks, and is now being used in emerging commercial applications, such as mesh networks, sensor networks, personal area networks, and wireless wide area networks. [0004] The present invention contemplates a multi-hop wireless network in which transmissions are coordinated using a Time Division Multiple Access (TDMA) protocol. The appeal of TDMA protocols is that they can provide bandwidth and delay guarantees through collision...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04B7/26H04W84/10
CPCH04W48/08H04J3/0655H04W72/0446H04W56/001H04J3/06H04W56/00H04W80/00
Inventor 塞奥佐罗斯·萨洛尼迪斯迪米特里奥斯·库措尼古拉斯亨里克·隆格伦
Owner INTERDIGITAL CE PATENT HLDG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com