主動(dòng)隊(duì)列管理中的PID控制器
PID controller for active queue management
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摘要: 作為對終端系統(tǒng)上擁塞控制的一種補(bǔ)充，中間節(jié)點(diǎn)上的主動(dòng)隊(duì)列管理(AQM)策略在保證較高吞吐量的基礎(chǔ)上有效地控制隊(duì)列長度，從而實(shí)現(xiàn)了控制端到端的時(shí)延,保證QoS的目的。C.Hollot等人(2001)用經(jīng)典控制理論中頻域校正的方法設(shè)計(jì)了用于AQM的PI控制器，但參數(shù)整定上的試湊方法不免代有盲目性；算法的瞬態(tài)性能指標(biāo)也不夠理想。為此，該文引入了微分環(huán)節(jié)來增強(qiáng)系統(tǒng)的響應(yīng)能力，同時(shí)給出了基于穩(wěn)定裕度的參數(shù)整定方法，使PID控制器的穩(wěn)定性有了絕對保障。仿真試驗(yàn)表明PID算法的調(diào)節(jié)時(shí)間遠(yuǎn)遠(yuǎn)短于PI控制器，從而為在負(fù)載瞬息萬變的網(wǎng)絡(luò)環(huán)境中實(shí)現(xiàn)控制分組排隊(duì)等待時(shí)間的目標(biāo)提供了有力的技術(shù)保障。
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關(guān)鍵詞:
- 主動(dòng)隊(duì)列管理; PID控制器; 擁塞控制
Abstract: Acting on the intermediate nodes, Active Queue Management (AQM) either keeps the high throughput for routers or effectively controls the queue lengths, so that arrives the object, to control end-to-end delay for QoS guarantees. C. Hollot, et al. (2001) designed the PI controller for AQM with the frequency approach in classical control theory, but it seems to be unscientific to tune the controller parameters through trial-errors, moreover the transient performance of the PI controller is not, perfect, such as the adjusting time is very long, etc. In this paper, the differential component is introduced to enhance the responsibility, and an approach for tuning controller parameters is put forward based on the explicit gain and phase margins. The simulation results show that the integrated performance of PID controller designed with the new approach is obviously superior to that of the PI controller. -
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