Design And Implementation For Expressway Communication System

Over the past decades, there has been a rapid development in expresswayconstruction in China. Communication system plays significant roles in thisdevelopment, such as functioning as a transmission channel for all sorts ofvoice, data, images and video services and exerting information-carryingcapacity. In addition, it not only safeguards expressway operation in a steady,safe and efficient way, but also is a vital mean of achieving modernexpressway management.Synchronous Digital Hierarchy (SDH) and Internet Protocol (IP) arecommonly used in a majority of expressway communication systems.However, these technologies have defects and deficiencies, so they are nolonger able to meet the demand of growing communication capacity andhigher communication quality and they need to be improved and upgraded.Automatically Switched Optical Network (ASON) and Resilient PacketRing (RPR) are relatively new technologies. Technically speaking, they aremore advanced and reliable and can better support expresswaycommunication system. This dissertation analyzes the principles andcharacteristics of both technologies, and proposes specific application ofprinciples and methods for expressway communication system.ASON is defined as a distributed or partially distributed control planethat allows for dynamic signaling/policy-driven control of an OTN or SDHnetwork, automating the resources and connection management within thenetwork. It has following functions: traffic engineering, flexible restoration,dynamic set up of connections by better utilizing optical layer resources,support various new types of optical layer services and different levels of service, match protection class with service class of client signaling, supportmesh networks protection, enhance the survivability of network, supportend-to-end automation and resource discovery.RPR is developed to optimize packet based transmission. It combinesadvantages of IP intelligence, Ethernet high bandwidth efficiency,multiservice access, high-bandwidth optical networks, and self-healing ability.It is characterized with dual counter rotating rings, spatial reuse, flexiblebandwidth granularity, dynamic bandwidth sharing and allocation, statisticalmultiplexing, service class supporting, automatically identifying networktopology, and protection switching based on source routing, etc.This dissertation takes expressways in some province for example toillustrate how to design and implement communication system with referenceto expressway business needs and relevant design principles of expresswaycommunication system, including expressway optical digital transmissionsystems, integrated service access, digital stored-program-control system,roadside emergency telephone system, communication power supply system,communication optical power cable, etc. It also details each system’s function,principle and components. Then, it selects equipment for each system andanalyzes every devise’s performance and characteristics. In order to achievedesign objectives and functions, the whole communication system is managedthrough integrated network management system and individual systemnetworking. Last but not least, the prospect of the application andimplementation effect of new technologies such as ASON and RPR forexpressway communication system is discussed. It also points out that theASON network upgrading progress should be gradual, from small to large,from center to edges. Eventually, it will achieve entire networkintellectualization.