CAJ | 학술논문

车联网信道资源稀缺及车载节点间的间歇性短暂链接,给车载节点通过无线接入点(AP)接入互联网进行内容下载带来了巨大挑战.AP覆盖范围内的资源分配与Internet链接空洞区域的传输调度相互依赖,共同影响其下载性能,而现有文献往往将二者孤立开来分别进行研究.为了提高下载性能,将二者作为一个整体,从全局优化的角度研究内容下载的效率问题,并将其形式化为下载数据量最大的结合非冲突调度的资源分配问题.但是,在证明该问题是 NP-难的基础上,提出结合链接空洞区域的传输调度的资源分配近似算法(JAS)来解决该问题.该算法将整个链接空洞区域节点间链接的时空变化模型化为拓扑图序列,并基于此构建其传输冲突图序列,在 AP 通信覆盖区域基于图序列计算优化的资源分配节点集进行资源分配,以期达到扩展AP通信范围、填补Internet链接空洞的目的.模拟实验结果表明,JAS 算法与现有方法相比显著提高了文件下载量及传输的成功率.此外,还对影响内容下载性能的相关因素进行了分析.
차련망신도자원희결급차재절점간적간헐성단잠련접,급차재절점통과무선접입점(AP)접입호련망진행내용하재대래료거대도전.AP복개범위내적자원분배여Internet련접공동구역적전수조도상호의뢰,공동영향기하재성능,이현유문헌왕왕장이자고립개래분별진행연구.위료제고하재성능,장이자작위일개정체,종전국우화적각도연구내용하재적효솔문제,병장기형식화위하재수거량최대적결합비충돌조도적자원분배문제.단시,재증명해문제시 NP-난적기출상,제출결합련접공동구역적전수조도적자원분배근사산법(JAS)래해결해문제.해산법장정개련접공동구역절점간련접적시공변화모형화위탁복도서렬,병기우차구건기전수충돌도서렬,재 AP 통신복개구역기우도서렬계산우화적자원분배절점집진행자원분배,이기체도확전AP통신범위、전보Internet련접공동적목적.모의실험결과표명,JAS 산법여현유방법상비현저제고료문건하재량급전수적성공솔.차외,환대영향내용하재성능적상관인소진행료분석.
Vehicular content downloading via open WiFi access points (APs) can be challenging due to sparse AP deployment with bounded communication range and the rapid movement of traveling vehicles. For drive-thru networks, resource allocation and scheduling closely interrelate to and interact with each other, collectively affecting the performance of content downloading. However, none of the previous work has tackled this problem as a whole. This paper discusses joint resource allocation and scheduling problem for efficiently content downloading considering channel contention and scarce AP resource utilized effectively. It formalizes optimization selection problem of node set to maximize the total quantity of data downloaded, and proves that it is NP-hard. Further, it presents a solution with a joint resource allocation and scheduling approximate algorithm (JAS). Theoretical analysis and simulation results both verify that the presented implementation achieves higher throughput and delivery ratio than the existing algorithms.