Reserch On Power Saving Control And Scheduling In 60GHz Millimeter Wave Communications

In order to meet people's requirements for ultra-high data transmission rate and further improve the capacity of wireless communication system,WLAN based on 60GHz millimeter wave band has become a current research hot topic.Most portable devices supporting milli-meter-wave communication use batteries as energy supplier.Because millimeter-wave communication uses a large number of antenna arrays to form directional beams,the energy con-sumption in millimeter-wave band becomes much larger than in previous wireless local area networks(WLAN),and the use lifetime of batteries is limited.Therefore,energy-saving control is a very practical research issue.In addition,on the basis of the traditional standard,com-bining the characteristics of millimeter wave transmission,the IEEE 802.11ad standard proposes some new scheduling mechanisms.And under the standard power management mecha-nism of IEEE 802.11ad,how to schedule communication resources and users has a great im-pact on the system performance.Therefore,resource scheduling under power management mechanism is very necessary.This thesis first focuses on power saving control and power management in millimeter wave communication.And then this thesis introduces and analyzes the power management mechanism in IEEE802.11ad standard,and points out that it has the shortcoming of energy waste,and it is difficult to adapt to complex application scenarios and higher quality of service requirements.In view of the power management mechanism in 802.llad,this thesis proposes a timer-based power management mechanism to improve the existing power management mechanism,that is,to add a sleep timer and idle timer to optimize the existing mechanism by adjusting two timers.The simulation results show that the proposed mechanism has a good balance between the power consumption and the size of the data frame to be cached by the access point.In the power management mechanism of the IEEE 802.11ad standard,the contention stage is allowed to support more complex scheduling methods.How to allocate the contention stage and how to schedule users will affect the performance of the system.Therefore resource allocation and scheduling are also problems worth studying.In this thesis,we propose two contention-stage scheduling algorithms,in which single CBAP assigns all users to a contention stage,and multi-CBAP divides the contention stage into several sub-contention stages according to the number of users and the degree of congestion,each subcontention stage assigns multiple users.The simulation results show that the normalized throughput and listening delay of the system are improved and the overall performance of the system is improved by com-paring single CBAP algorithm with multi-CBAP algorithm,.