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Design of Clock Synchronization of Base Station by Using 8A34002
The stability of the entire base station depends on the synchronization of the base station’s clock. The clock synchronization management chip 8A34002 supports SyncE Ethernet and IEEE 1588. In this architecture, the GPS receiver, SSI, and master/slave switching device all emit PPS/TOD signals. PPS/TOD signals are input into the FPGA, which outputs one PPS/TOD signal. The PPS/TOD signal enters 8A34002 in this design scheme, and the DPLL of 8A34002 provides filtering and clock-following output. The 8A34002‘s signal output is used as the system’s clock after processing. The switching chip, X86 main control chip, and BBU base station board are all driven by the system clock, which serves as a reference clock. The 8A34002 uses four DPLLs, one each for the SyncE, PTP, GNSS, and test functions.
Journal Article
Design Methodology of Automotive Time-Sensitive Network System Based on OMNeT++ Simulation System
Advances in automotive technology require networks to support a variety of communication requirements, such as reliability, real-time performance, low jitter, and strict delay limits. Time-Sensitive Network (TSN) is a keyframe transmission delay-guaranteed solution based on the IEEE 802 architecture of the automotive Ethernet. However, most of the existing studies on automotive TSN performance are based on a single mechanism, lacking a complete and systematic research tool. At the same time, the design method should be considered from a global perspective when designing an automotive TSN system, rather than only considering a single mechanism that TSN applies to. This paper discusses the correspondence between traffic types and automotive scenarios and proposes a methodology to target the delay constraint of traffic types as the design goal of automotive TSN networks. To study the performance of automotive TSN under different mechanisms such as time-aware shaper (TAS), credit-based shaper (CBS), cyclic queuing and forwarding (CQF), etc., this paper also develops a systematic automotive TSN simulation system based on OMNeT++. The simulation system plays a crucial role in the whole methodology, including all applicable TSN standards for the automotive field. Lastly, a complex automotive scenario based on zonal architecture provided by a major motor company in Shanghai is analyzed in the simulated system; verifying TSN can guarantee real-time performance and reliability of the in-vehicle network.
Journal Article
Development of an Ethernet-Based Heuristic Time-Sensitive Networking Scheduling Algorithm for Real-Time In-Vehicle Data Transmission
The rapid development and adaptation of advanced driver assistance systems (ADAS) and autonomous driving increases the burden of in-vehicle networks. In-vehicle networks are now required to provide a fast data rate and bounded delay for real-time operation, while conventional protocols such as controller area networks, local interconnected networks, and FlexRay begin to show limitations. Ethernet-based time-sensitive network (TSN) technology has been proposed as an alternative. TSN is a set of Ethernet standards being developed by the IEEE TSN task group, which aims to satisfy requirements such as real-time operation, stability, and low and bounded latency, and it can be used in automotive, industrial, and aerospace applications. This study introduces several standards for Ethernet traffic scheduling based on TSN technology and proposes a heuristic-based scheduling algorithm for Ethernet scheduling. In addition, three network configurations are simulated using OMNeT++ to show the applicability. The heuristic TSN scheduling algorithm is a straightforward and systematic procedure for practical network designers.
Journal Article
A Ship Fire Monitoring and Alarm System Based on A Distributed Configuration
This article conducts innovative research based on distributed fire monitoring and alarm systems. It consistst of six FDS Control Panels, connected by a redundant Ethernet network, to ensure that all the FDS Control Panels can receive and transmit the relevant data. This connection is provided with redundant backup using a secondary channel of communication for use when the main channel is not working due to failure or cable damage.
Journal Article