ZTE

ZTE Communications ›› 2010, Vol. 8 ›› Issue (3): 9-12.

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Several Issues in the Development of Packet Transport Networks

Jing Ruiquan   

  1. China Telecom Corporation Limited Beijing Research Institute, Beijing 100035, P. R. China
  • Online:2010-09-25 Published:2020-02-28
  • About author:Jing Ruiquan is a senior engineer of China Telecom Corporation, Beijing Research Institute, and is a member of the information communication expert team of the National High Technology Research and Development Program of China “( 863”program). His research interests include optical transport networks, packet transport networks, and IP RAN bearing technology. He has long been engaged in planning, construction, and technical research of optical transport networks, and has participated in many SDH, MSTP, and ASON testing tasks. He has p
  • Supported by:
    This work was funded by the National High Technology Research and Development Program of China (“863”program) under Grant No. 2007AA01Z2A4.

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Abstract: Several key issues affect the development and standardization of Packet Transport Networks (PTN) and Multiprotocol Label Switching Transport Profile (MPLS-TP). These include the end-to-end Quality of Service (QoS) mechanism, layered network architecture, introduction of layer-3 functions, and data-plane loopback functions. This paper introduces several views on the construction and maintenance of PTN, and on the requirements of PTN services. After an analysis of Traffic Engineering (TE) based on Multiprotocol Label Switching (MPLS) and Differentiated Service (DiffServ), a service-oriented end-to-end QoS guarantee mechanism is proposed. An alternative to introducing layer-3 functions into PTN is also proposed, based on PTN layered architecture defined in the available MPLS-TP standards and drafts. Requirements of data-plane loopback functions are discussed in conclusion.