CAJ | 학술논문

随着网络技术的发展，用户对网络的服务质量要求越来越高。传统的IP网络是针对非实时数据传输而设计，提供“尽力而为”的服务，难以满足不同业务的服务质量要求。研究表明区分服务( DiffServ)模型具有简单、有效、扩展性强等特点。它对业务流进行分类、整形使得不同类型业务数据在网络中得到不同服务。队列调度算法是实现区分服务的核心机制之一。文中分析了DiffServ模型下常见的WRR和DWRR调度算法的优缺点，在DWRR算法的基础上提出一种改进的队列调度算法( VDWRR)，同时将PRI(优先调度)算法与VDWRR算法相结合，很好地满足了业务的时延特性。用NS-2网络仿真器进行性能评价，结果表明了该算法的有效性和可行性，可以为不同业务提供更好的服务质量保证。
수착망락기술적발전，용호대망락적복무질량요구월래월고。전통적IP망락시침대비실시수거전수이설계，제공“진력이위”적복무，난이만족불동업무적복무질량요구。연구표명구분복무( DiffServ)모형구유간단、유효、확전성강등특점。타대업무류진행분류、정형사득불동류형업무수거재망락중득도불동복무。대렬조도산법시실현구분복무적핵심궤제지일。문중분석료DiffServ모형하상견적WRR화DWRR조도산법적우결점，재DWRR산법적기출상제출일충개진적대렬조도산법( VDWRR)，동시장PRI(우선조도)산법여VDWRR산법상결합，흔호지만족료업무적시연특성。용NS-2망락방진기진행성능평개，결과표명료해산법적유효성화가행성，가이위불동업무제공경호적복무질량보증。
With the development of network technology,the quality service requirement of network is increasingly improved. Since the tra-ditional IP network is designed for the real-time data transmission and providing“Best effort” service which is difficult to satisfy the QoS requirement. Many studies have shown that Differentiated Service ( DiffServ) model provides IP networks with QoS processing,due to its simplicity and scalability. The queue scheduling algorithm is one of the core mechanisms for realizing the DiffServ. It analyzes the advan-tage and disadvantage between common WRR ( Weighted Round Robin) and DWRR ( Deficit Weighted Round Robin) scheduling algo-rithm under the DiffServ model,and based on DWRR algorithm,put forward an improved VDWRR ( Variable Deficit Weighted Round Robin) queue scheduling algorithm. At the same time,the PRI combined with VDWRR algorithm well satisfies the time delay characteris-tic of the business. With NS-2 network simulator for performance evaluation,the results show the feasibility and effectiveness of the algo-rithm,and it can provide better QoS guarantee for different business.