摘要 : The modern telecommunication has come into the Long-Term Evolution (LTE) era. The whole transmission network gradually has evolved to the IP network. The overall network organization is likewise becoming more and more similar to t... 展开 The modern telecommunication has come into the Long-Term Evolution (LTE) era. The whole transmission network gradually has evolved to the IP network. The overall network organization is likewise becoming more and more similar to the metropolitan data network. A mobile Packet Transport Network (PTN) transmission network construction is investigated. The specific bearing requirements of time division long-term evolution (TD-LTE) are analyzed. The topology structures of L3 and L2/L3 and the equipment applications in different network levels of the PTN network are discussed. The existing problems concerning the circuit scheduling, disaster tolerance requirement, security connection and business pressure are analyzed in detail. Their corresponding optimization strategies are presented. Finally, the network level having a clear, robust and complete coverage is reached. It proves that the optimized network can meet the third level of the disaster tolerance international standard SHARE 78. 收起