Threshold Of Service And Full Service Two Levels Of E (x) Characteristic Analysis Of Polling System

Poll, which is cyclic back and forth movement, efficiently distributes and shares resources in control field, as well as reasonably distributing and sharing the control of limited bandwidth resource or channel in computer network communication. It will be a key research, including poll control schedule technology, poll technology taking the character of cyclic control, etc, in next-generation development of bandwidth mobile communication technology and the internet of thing. Poll technology, appearing first in industry process control in the middle of the twentieth century, with the rapid development of computer net communication technology and automatic control technology, is applied broadly in these fields for its fairness and practicability.With the rapid development of wireless network communication technology, the application of poll schedule control model is further expanded. The applications of poll multi-access are applied widely in the MAC layer access protocol of blue teeth, WLAN, wireless self-organization network (including:WSN, ad hoc, wireless mesh net). New research achievement on poll queue theory inimproves the development of communication net system, computer system, transportation, logistic system and industry process control, etc. analyzing poll system is to mathematical model and its functional relations which meet poll control system, and analyze out characteristic-parameter mathematical expression of the system average queue length, average cyclic period, throughout, etc. In the recent ten years, researchers have done a lot of analysis and research, and continually expend its applications. Poll system has become a powerful tool, as practical application analysis and research model, whose MAC ways are classified into poll and random multi-access in communications and computer network. In practical applications, focusing on different service provisioning,priority services are required generally, and the research on poll system based on priority services is always the high-point question. Poll system based on priority control question is researched continually for its broaden application value. Based on the search on gated service, exhaustive service, and defined K=l service poll system, as well as on two staged priority poll-control model of mentor, researcher YangZhijun, in order to meet practical network model and improve the existing model, it proposes a new two staged priority control poll system model, which realizes priority control, and improve system performance through the way of churning services. Then, it establishes systematic mathematical model through taking embedded Markov chain and probability generating function, which accurately analyzes the system-parameter accurate expression of average queue length, average inquiring period and system throughput etc of both high priority website and low priority website. The comparison and analysis between theoretical calculation and simulation experiment show the consistency between theoretical analysis and experiment. In addition, New poll system model realize priority control and improve system performance, to meet practical requirement of priority control and establish theoretical base for separating operation priority network.As mobile ad hoc, which has the characteristics of self-organization, temporality, moving at will, fast network, etc, do not need any wireless infrastructure supporting, it first appeared in military field, which first came from American DAPPR that PRN were launched for military communications. It also works in civil fast network. However,as new network, there are still existing a lot of problems.Mobile ad hoc network using wireless channel technology is a key question to the admission control algorithm of network MAC layer. There are two kinds of MAC layer access protocol; one, based on competition mechanism, can not meet the requirement of high-real time operation to QoS and system performance will degrade badly in overload network. However the other, based on polling mechanism, for its fairness, can meet the requirement of high-real time operation and under overload network, it can keep high system performance. So, polling MA taken as an important access control mechanism is applied in current mobile ad hoc network in rapid development.