Timing and Synchronization with Propagation Delay Symmetry and Originated Slave Clock Frequency for Ubiquitous Computing

Kang, Sung-Hwan; Ahn, Jeong-Gyun; Kwon, Yongsik; Eom, Jong-Hoon; Kim, Sung-Ho

doi:10.1109/cisis.2010.40

Cited by 2 publications

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, we analyze an in-car scenario with the typical applications where the number of switches in a network is limited. K. Sunghwan et al [13] improved the 802.1AS synchronized time accuracy up to 5% by using single time synchronization frames which considered the propagation delay symmetry and physical coding sublayer (PCS) clock counter. The proposed concept requires a modification of a physical layer (PHY) in an IEEE 802.3 Ethernet standard to invoke the PHY and transmits the synchronization messages to the time-stamp agent.…”

Section: Related Workmentioning

confidence: 99%

IEEE 802.1AS time synchronization in a switched Ethernet based in-car network

Lim

Herrscher

Völker

et al. 2011

2011 IEEE Vehicular Networking Conference (VNC)

View full text Add to dashboard Cite

As of today Ethernet is used in the in-vehicle network mainly for two use cases: connectivity between the head unit and the rear seat entertainment (RSE) as well as faster onboard diagnostics (OBD). With the increasing bandwidth demand in driver assistance and the wish to easier interconnect the driver assistance and infotainment domains additional usage of Ethernet in the vehicle is being examined. The legacy Ethernet does only provide very limited Quality-of-Service (QoS) mechanisms so that demanding real-time in-vehicle applications cannot meet their constraints. The Audio/Video Bridging (AVB) group introduced several IEEE standards to allow audio and video applications with high QoS demands in a switched Ethernet network. Although these mechanisms were not designed for automotive use cases, they are good extensions to switched Ethernet when QoS demands exist. Therefore, an evaluation of AVB for the usage in in-vehicle networks is needed. In this work, we focus on a base mechanism of the IEEE 802.1 AVB standard, the IEEE 802.1AS time synchronization protocol and its usage in the in-vehicle network. The evaluation is performed by simulation with the network simulation tool OMNeT++ and we modifed the INET-framework with the IEEE 802.1AS capability for our purpose.

show abstract

Section: Related Workmentioning

confidence: 99%