Study And Implementation Of An Efficient MAC Protocol On Nutaq Platform

The increasing of mobile phone users and rapid development of mobile internet has been driving innovations of wireless communication technologies. Device-to-Device communication is a hot technology that allows devices to communicate with nearby devices directly in a cellular networks. It can increase the spectral efficiency of a cellular communication system, reduce the transmission power of devices. D2 D technology can effectively improve the resource utilization and capacity of network.This paper first deeply studies the core ideology and work flow of Do-Fast algorithm. Do-Fast algorithm is aimed at solving the throughput and scheduling delay caused by random accession of links in Flash Lin Q algorithm. Do-Fast algorithm sorts the links based on link channel information, thus links with higher priority can get more scheduling opportunities and longer time, which greatly improves the overall throughput of the network system. Moreover, by using inter-group polling and polling mechanism within the group, the algorithms ensures low-priority links to obtain a certain number of slots scheduling opportunities, thus avoids the starvation of low priority links and ensures the fairness of scheduling. In addition, this algorithm adopts a time division multiplex mechanism to support a low-latency bi-directional connection so that this algorithm can support real-time services such as VOIP, video chat and interactive games.This paper then introduces the implementation of Do-Fast algorithms on Nutaq platform. Nutaq platform is a rapid developing and verifying platform based on the ideology of software radio. It has a flexible and efficient integrated development tool chain and agile development process with which a communication system can be rapidly built. OFDM technology is the base of Do-Fast algorithms, this paper describes the core ideology and implementation of transmitting and receiving data flows, then focuses on the implementation of service slot. In Connection scheduling phase, the inter-group scheduling polling and polling mechanism within the group ensure the overall throughput and fairness of scheduling. Low-latency bidirectional connection is supported through a reasonable timeslot design support. Rate adjustment mechanism can improve the transmission rate as high as possible under the premise of correct demodulation. Data transmission phase provides error checking and retransmission mechanisms to ensurecorrect transmission of data. Data buffering mechanisms between the application layer and MAC, MAC layer and physical layer provides a simple and reliable data transfer interface.Finally, test and simulation of Do-Fast algorithm on Nutaq platforms are done. The critical performance and physical layer data transmission are tested and the MAC protocol is simulated. The algorithm is correctly implemented on Nutaq platform.