The Research Of Stream Reservation Protocol For In-vehicular Time-sensitive Network

More and more of the requirements of modern automobiles are the keywords of comfort,safety,multimedia Infotainment,driver assistance,and so on.Multimedia Infotainment System(MIS)applications such as CD audio,DVD players.Advanced Driver Assist System(ADAS)applications such as lane-departure warnings that rely on cameras,traffic sign recognition,Anti-collision system.These applications not only have high bandwidth requirements but also have strict delay limits.Considering the challenging bandwidth requirements that will be faced by future automotive applications,it is necessary to accelerate the standardization of Ethernet in the automotive field.As a result,the Institute of Electrical and Electronic Engineers(IEEE)developed a new set of sta ndards called Time-Sensitive Networking(TSN).The TSN task group provides a means of providing time synchronization,called the generalized Precision Time Protocol(IEEE 802.1AS),a method of bandwidth guarantee called the Stream Reservation Protocol(IEEE 802.1Qat),and a set of forwarding and queuing rules that limit delay variability in the TSN network,known as Forwarding and Queuing for Time-sensitive Streams(IEEE 802.1Qav).These protocols can be used to support the implementation of various audio and video applications in vehicles.Nowadays,as people deepen their understanding of software testing,software testing naturally becomes an integral part of the software development cycle.Software is more widely used and people are more concerned with the quality of the software.Because of the increasing number of accidents caused by software defects,which has promoted the research of software testing,breakthroughs have been made in the application and theoretical research of software testing.This project is cooperating with a communications company and it mainly studies the implementation of the Multiple Stream Registration Protocol(MSRP)in the Stream Reservation Protocol(SRP).The work of this paper mainly focuses on the design and implementation of the function test of the stream reservation protocol,and the research on the method of bandwidth reservation anti-collision in the app lication of the stream reservation protocol.First,the content of the Stream Reservation Protocol is studied in detail,including: the functional requirements of the protocol language,message types,message fields,attribute propagation components,and bandwidth calculations.Then,the design and implementation of the Stream Reservation Protocol function test are described in detail,which mainly include: abstract protocol function,design specific scenario and test program for protocol function.Then,protocol consistency verification is completed on the hardware board of the vehicle terminal.Finally,with the increase of on-board applications,bandwidth resources may not be sufficient when a terminal needs to reserve bandwidth for multiple audio and video data streams at the same time.How to allocate limited resources is worth considering.In response to this problem,this paper proposes a bandwidth reservation anti-collision method whose core is the data stream priority sorting method.By determining the priority order of the data stream reservation request and performing bandwidth reservation,the bandwidth reservation efficiency can be improved,and the node data transmission collision can be efficiently avoided.