CAJ | 학술논문

针对集中控制认知无线网络，在考虑频谱异构特性的同时，为保证频谱切换业务的服务质量，提出了一种多跳频谱切换算法。通过建立用户移动模型来预测分配信道的可使用时间；设计出路径中不同类型节点的路由处理方法；认知基站根据预测最短路径时间和路由请求包中的时间戳来选择最优路径。仿真结果表明，提出的多跳频谱切换算法能够大大降低切换阻塞概率，提高信道利用率；用户移动对信道可使用时间有着显著的影响。
침대집중공제인지무선망락，재고필빈보이구특성적동시，위보증빈보절환업무적복무질량，제출료일충다도빈보절환산법。통과건립용호이동모형래예측분배신도적가사용시간；설계출로경중불동류형절점적로유처리방법；인지기참근거예측최단로경시간화로유청구포중적시간착래선택최우로경。방진결과표명，제출적다도빈보절환산법능구대대강저절환조새개솔，제고신도이용솔；용호이동대신도가사용시간유착현저적영향。
In order to guarantee the quality of service for spectrum handoff, a multi-hop spectrum handoff algorithm is presented for the centralized cognitive radio networks, in which spectrum heterogeneity has been taken into account. A user mobile model is developed to predict the usage time of allocated channel, the different processing approaches are designed for different types of nodes in the routing path, and the cognitive radio base station selects the optimal path according to the predicted shortest path time and time stamp. Simulation results reveal that the proposed multi-hop routing algorithm can considerably decrease the hand-off blocking probability, and the channel utilization is also enhanced. Moreover, further simulation results show that cognitive ra-dio node’s mobility plays an important role in the channel available usage time.