| In recent years, with the rapid development of embedded technology and MEMS technology, the short distance Wireless communication Network WBAN (Wireless Body Area Network), which uses the human body as the main carrier, becomes a major branch of Wireless sensor Network and the important constituent of things Internet, and it has become an emerging technology in the telemedicine industry because of its wide range practicability as well as the important role in human medical care, entertainment, sports and so on. WBAN has caused great attention of scholars both at home and abroad. At present, the research on the key technology is just starting, and in order to realize the large scale of application, there are many technical problems still have to be solved.In WBAN, as the sensor nodes are deployed in human body surface or implanted, it is difficult to replace the node battery, which brings higher requirements on its energy saving. Power control technology can effectively reduce the energy consumption during communication, so it is an effective measure to extend the life cycle of sensor nodes. Meanwhile, the good power control strategy can also reduce the interference to other networks of the same frequency. Against this special environment and requirements of WBAN used, this article intends to research WBAN from the perspective of the network structure and key technology.First, by analyzing the rules and requirements of IEEE802.15.6communication standards, this article embarks from the ultra-broadband technology, researches WBAN’s channel characteristics based on the technology of UWB. Referring to large number of foreign literatures which give relevant test data of WBAN channel characteristic, the author finds out that the radio transmission of vitro model based on the technology of UWB is diffraction, the attenuation index of it close to6, which is bigger than the path loss index of free space.Second, studied the WBAN’s network topology:single jumped star and two tree type restrictions, and modeling and simulating the network performance of it on the NS-2software platform. By analyzing the results concluded that one hop star has small time delay, big network throughput, but the interrupt rate is high. Two jump tree has longer relatively delay, throughput is small, but the outage probability is small. Therefore, in actual use process, choose what kind of network structure according to the different usage scenarios is the key to meet the service quality.Finally, this article studies the wireless power control algorithm of WBAN domain network based on the knowledge of game theory.Proposed a non-cooperative game of power control algorithm based on cost function for WBANs. Proposed a power control algorithm based on relay cooperative game for WBAN, and proceed the theoretical derivation and experimental simulation of two algorithm. The simulation results show that both algorithms can make each network percept to choose the best transmission power, to maximize profits, effectively reduce the interference between networks and energy waste. |
