Narrow Results

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.

With the widespread application of wireless communication technology, wireless spectrum resource scarcity has become increasingly prominent. A way to efficiently utilize the limited spectrum resource to satisfy increasing mobile traffic is key to the development of wireless communication system in the power industry, especially for the 230MHz TD-LTE network. To this end, spectrum sensing technology has emerged as a promising solution, and this paper thus studies the rational use of the idle spectrum resources collaborative sensing technology to improve spectrum efficiency in the use of the 230MHz frequency band. Results from the application and evaluation of this technology verify its effectiveness, providing a basis for further development of 230MHz band spectrum sharing.

The widespread popularity of private wireless TD-LTE network is recognized as an effective means for complementing optical fibers in Smart Grid communications. However, the TD-LTE network faces the challenge of blind coverage areas, such as underground and in buildings' corners. This paper presents a seamless relay mechanism for private wireless TD-LTE network in Smart Grid, with a detailed description of its network architecture, implementation topology, working mechanism and performance evaluation. The mechanism works at 470MHz and utilizes customized relay nodes to extend the coverage of TD-LTE network to those blind areas, thus achieving seamless communication for power distribution, metering, etc.

TD-LTE (Time division duplex-long term evolution) is a mainstream standard of the fourth generation mobile communication led by China. In this paper, a TD-LTE base-station signal is proposed to achieve passive detection of targets as external radiation sources. First, it is proposed that the detection distance of the passive radar can be enhanced using multi-static radar according to the characteristics of TD-LTE. The processing of passive radar signal of TD-LTE is then given. By reconstructing the reference signal according to the 3GPP standard, pure multi-base station signals can be attained without demodulation. Finally, the characteristics of the ambiguity function of OFDM (orthogonal frequency division multiplexing) signal is analyzed. The reasons and positions of side peaks are deduced, and the ambiguity is resolved via frequency domain synthesis. The availability of the method proposed is proven using actual signals.

With the commencement of construction of the smart grid, the demand power business for reliability and security continues to improve, the reliability transmission of power TD-LTE Wireless Private Network are more and more attention. For TD-LTE power private network, it can provide different QoS services according to the user's business type, to protect the reliable transmission of business. This article describes in detail the AF module of PCC in the EPC network, specifically introduces set up AF module station and QoS mechanisms in the EPS load, fully considers the business characteristics of the special power network, establishing a suitable architecture for mapping QoS parameters, ensuring the implementation of each QoS business. Through using radio bearer management, we can achieve the reliable transmission of each business on physical channel.