Research On Key Techniques Of Radio Resource Allocation In Relay-enhanced Cellular Networks

China’s coal industry plays a very important role in the economy, coal mine safety management is a key part of the coal industry. However, due to the coal mine, the distribution of underground personnel is unknown, event of an accident, rescue work can not be effective and timely. Moreover, the lack of safety equipment, safety management methods are backward, unable to grasp the distribution of underground personnel, leading to mine workers in case of accident and not a good disposition. In order to ensure safety in coal production and coal industry to accelerate the process of modernization, China has dozens of sets from overseas monitoring system, to learn from, on this basis, research and design of the safety monitoring system for coal mine. Therefore, the study and design of the coal industry safety management system is very necessary. RFID-based management of underground personnel positioning system, it can be used for safety in production, greatly improving coal mine safety administration.In this paper, through the investigation of relevant industries and the direction of development, and the thesis on the basis of the structure of the organization. By analyzing the current status of the theory and study of underground personnel positioning system, to determine the technical options laid the foundation, including the RFID radio frequency technology, field bus based on CAN bus technology, and will also use the appropriate application of industrial Ethernet technology. And the system needs analysis and provides a framework for the whole system, out of the system functions and requirements analysis, system implementation and identify functional solutions. Underground personnel positioning system is divided into several subsystems, targeted for the detailed design of each subsystem module, it includes an RF transceiver module, the main card reading station, power supply module and CAN to Ethernet converter module, and on the basis of hardware design. In this context of underground personnel positioning management system, using STM32 core processor to handle data, and establishing information transmission network based on this. Because a lot of coal mine tunnel, and CAN bus connection can only support 110 nodes. The system is based on RFID wireless communications technology, increase the network via the relay node, To support data transmission and reception of RF transceiver module, expand the network transmission distance. The system has a low cost and strong anti-jamming capability, so you can realize CAN bus two-way communication. Via CAN bus to transmit data to the host computer needs, data conversion interface conversion data from the CAN bus to RS485. The RFID system will receive data uploaded to the host computer information collection, processing and preservation of relevant information, and ultimately the management scene underground personnel management software from the computer.Through the experiment of Ethernet debug tools, real-time location data received underground personnel, after a long period of testing, the functionality and performance of this system are as expected, and stable, safe and reliable.