Research Of Resource Scheduling And Spatial Sharing For 60GHz Millimeter-wave WLAN

Millimeter-wave(mmWave)communication has been studied by many organizations due to its large bandwidth,high transmission rate,and beam separation in space.The mmWave WLAN standard formulated by the IEEE has been added some new mechanisms in order to adapt to the mmWave characteristics,such as more complex resource allocation schemes,scheduling and spatial sharing mechanisms.It is very important to design efficient algorithms for the resource allocation and spatial sharing in mmWave WLAN systems using these new mechanisms.Therefore,this thesis focuses on the channel access,user scheduling and spatial sharing in mmWave WLAN systems to study efficient resource allocation,user scheduling,and spatial sharing mechanisms.First,we study the resource allocation and user scheduling mechanisms for 60 GHz mmWave WLAN systems.For the same network scenario,different resource allocation and user scheduling schemes have different system performances.In order to meet the network requirements such as throughput and communication delay,we propose three scheduling algorithms for contention period based scheduling.We compare the throughput and delay for the three algorithms when the number of stations and time resources are fixed.In the service period scheduling,the control node adaptively allocate more time resources for stations according to the channel state information to ensure the communication of stations.Our research can provide some insights for designing scheduling algorithms and deploying the network.Then,to address the problem of low sharing efficiency caused by the increasing number of users,an efficient and fast spatial sharing method is proposed.The main idea is as follows: The first step is that the control node schedules all stations to measure the experienced interference with each other and each station reports the measurement result to the control node.Then,the control node calculates the global interference table.For each station,the largest subset of stations that do not interfere with each other can be found using the interference combination scheme,which is called “subset SPSH pool”.Finally,according to the SPSH pool of each station,the control node can schedule SPSH quickly.In the proposed scheme,since each station only needs to measure once,it can improve SPSH efficiency significantly especially when there are too many stations.