计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2014年
20期
229-232
,共4页
周佳%黄天聪%王炜%吴玉成
週佳%黃天聰%王煒%吳玉成
주가%황천총%왕위%오옥성
WiMAX%上行调度%实时业务%多用户
WiMAX%上行調度%實時業務%多用戶
WiMAX%상행조도%실시업무%다용호
WiMAX%uplink scheduling%rtPS%multiuser
针对WiMAX建议的rtPS和ertPS调度机制处理变速率实时业务时MAC层开销大,导致时延增大的缺点,提出了一种能够有效调度多用户变速率实时业务的上行链路调度算法。该算法在SS端实时监控数据率,减少发送带宽请求的次数,从而提高整体的上行链路资源利用率,并在BS上行调度器中优化调度策略,使得最急迫的用户优先得到服务。仿真结果表明该算法与ertPS相比,在不影响系统吞吐量的情况下上行时延减少了约15%。
針對WiMAX建議的rtPS和ertPS調度機製處理變速率實時業務時MAC層開銷大,導緻時延增大的缺點,提齣瞭一種能夠有效調度多用戶變速率實時業務的上行鏈路調度算法。該算法在SS耑實時鑑控數據率,減少髮送帶寬請求的次數,從而提高整體的上行鏈路資源利用率,併在BS上行調度器中優化調度策略,使得最急迫的用戶優先得到服務。倣真結果錶明該算法與ertPS相比,在不影響繫統吞吐量的情況下上行時延減少瞭約15%。
침대WiMAX건의적rtPS화ertPS조도궤제처리변속솔실시업무시MAC층개소대,도치시연증대적결점,제출료일충능구유효조도다용호변속솔실시업무적상행련로조도산법。해산법재SS단실시감공수거솔,감소발송대관청구적차수,종이제고정체적상행련로자원이용솔,병재BS상행조도기중우화조도책략,사득최급박적용호우선득도복무。방진결과표명해산법여ertPS상비,재불영향계통탄토량적정황하상행시연감소료약15%。
WiMAX standard proposes rtPS and ertPS to support real-time UL service flows. However, rtPS and ertPS bring additional delay because of huge MAC overhead while serving real-time traffic with variable data rate. An efficient multiuser UL scheduling algorithm is proposed to decrease UL delay in this paper. This algorithm improves UL resource utilization by monitoring traffic at SS, thereby reducing sending times of bandwidth request. Moreover, the most emergen-ciest uplink connection can be served in time by optimizing UL scheduler of BS. The simulation results show that the pro-posed algorithm obviously decreases UL delay by 15%and does not affect system throughput simultaneously.