Research On The Improvement Of QoS Technology In 60GHz Millimeter Wave Communication

With the rapid growth of data services and multimedia services,people are putting forward higher requirements on the QoS of wireless communications.For example,the network needs to provide higher transmission rates,lower latency,higher reliability communications,and can serve a large number of users and so on.The traditional network mainly uses spectrum resources below 6 GHz,and the spectrum resources are relatively scarce.As the continuous growth of communication demands,low frequency bands are gradually unable to meet people's communication needs.The 60 GHz millimeter-wave frequency band has a large amount of spectrum resources and can provide a relatively higher transmission rate,so 60 GHz millimeter-wave(mmWave)communication has gradually become a research hotspot.The Institute of Electrical and Electronics Engineers(IEEE)proposed the IEEE 802.11 ad standard and the IEEE 802.11 ay standard is being revised for 60 GHz millimeter-wave communication.A relatively higher transmission rate can be obtained by utilizing a large amount of spectrum resources.However,60 GHz mmWave communication can be easily interrupted due to obstructions and other reasons,thus the reliability of the communication is relatively lower,and the time delay is relatively higher.It is difficult to meet people's needs for low latency,high reliability communications.In addition,60 GHz mmWave communication uses directional beams and PCP/AP and STA mainly exchange information such as resource allocation information in a one-to-one manner,so the efficiency is relatively low.In the future,there may be more and more users,especially in some dense user scenarios,the information exchanges will take a relatively long time.Under this circumstance,some STAs even can't receive the corresponding resource allocation information due to time constraints,and thus can not perform data transmission.This thesis mainly focuses on two aspects:The first aspect analyzes the reasons why 60 GHz mm Wave communication is likely to cause communication outage,and on this basis,a fast link recovery scheme is proposed.This solution uses backup links to increase the reliability of communications and reduce the latency of communications.This thesis describes in detail the establishment process of the backup link,the maintenance process and the rapid recovery process of communication,and carries out the theoretical analysis and simulation verifications.The results show that this scheme can effectively reduce the average communication recovery time after the communication outage(for example,when p is 0.1 and there are two backup links,it takes about 58% less time than 802.11ad)and the probability of communication outage(For example,if p is 0.3 and there are 4 backup links,the probability of communication outage is about 80% lower than that of 802.11ad),and increase the average throughput of the network,which improves the performance of the entire network to some extent.The second aspect analyzes in detail the low efficiency of the current method for information exchange between PCP/AP and STA,and proposes a multi-channel Announcement Transmission Interval(ATI)solution.The scheme applies multi-channel communication to the ATI period,making the method of information exchange from one-to-one to one-to-more,which can improve the efficiency of information exchange.This thesis describes in detail the frame structure design,synchronization solution,scheduling algorithm and multi-channel ATI process of the multi-channel ATI scheme,and carries out simulation analysis.The simulation results show that the scheme can effectively improve the efficiency of ATI period(Communication efficiency can be increased up to about 70% when using four channels in the multi-channel ATI scheme),which in turn allows the PCP/AP to serve more STAs,thus improves the performance of the entire network to some extent.