Abstract-Traffic delay is one of the important metrics used for evaluating network performance. Delay and delay variation characteristics of IP packets transferred over multi-section networks can be derived, estimated or composed from component distributions of IP package delay in each network section. Approximate methods are needed in the cases of unknown or complicated delay distribution functions, which are unavailable or unusable in practice. The ITU-T has proposed a method for estimating IP packet delay variation. One of noticeable factors affecting the estimation accuracy is the packet delay population quantile which has not been adequately considered. The objective of this paper is to examine the optimal range of quantiles used for estimating the IP packet delay variation in the NGN (Next Generation Network) core networks. The paper is composed from the following ideas. Firstly, several concepts and mathematical formulas related to delay metrics based on probability and statistics theory are defined. The approximate method of ITU-T for estimating the IP packet delay variation in a multi-section network is revised. Then, another method based on convolution for composing the empirical IPTD distribution functions is proposed for the same target as the first one. Secondly, a number of test cases are implemented to measure the IP packet delay on several sections of an NGN core network. Sample data are used for computing and estimating the IP packet delay variation for multi-section networks by two methods with certain hypotheses. Finally, these methods are compared and evaluated both theoretically and empirically in regards to the estimation accuracy versus quantiles of the IP packet transfer delay. The best range of quantiles is determined to ensure the accuracy of the estimation method applied for the NGN core network.
It is my great pleasure to welcome you to the 2014 international conference on advanced technologies for communications (ATC 2014), hosted by Posts and Telecommunications Institute of Technology (PTIT), co-organized together with our partners, the Radio Electronics Association of Vietnam (REV) and the IEEE Communications Society (IEEE ComSoc). Held under the auspices of Ministry of Information and Communications of S.R. Vietnam (MIC), the conference brings together many outstanding senior leaders, scientists, researchers, actors, scholars in the area of ICT from the leading research organizations, universities around the world to Hanoi, the hospitable and historic capital of Vietnam.
Nowadays, the DiffServ architecture is considered the most prevalent solution of QoS provision in IP networks. What is the best way to implement this architecture is still a question without answer. The most complicated part in DiffServ implementation belongs to AF BHP. Indeed, the complication of AF comes not only from its architecture, but also from its goals. This paper will propose a method to implement AF ij of AF BHP at core routers in DiffServ networks. Using this method, we can make AF subclasses (AF ij) easily. Moreover, the performance of the system will be better since the mechanism has congestion control ability and fair sharing between subclasses in an AF class. Tóm tȃt. Hiê. n nay, kiến trúc di. ch vu. khác biê. t du. o. . c xem nhu. mô. t gia 'i pháp da 'm ba ' o chất lu. o. . ng di. ch vu. trên ma. ng Internet. Cách thu. . c thi tốt nhất kiến trúc kiê ' u này còn là mô. t vấn dề dê ' ngo '. Thành phầ n phú. c ta. p nhất trong viê. c thu. . c thi di. ch vu. khác biê. t thuô. c về AF BHP. Tính phú. c ta. p cu 'a AF không chı ' là vấn dề kiến trúc mà còn là mu. c tiêu cu ' a nó. Bài báo dề xuất mô. t phu. o. ng pháp dê ' thu. . c thi AF ij cu ' a AF BHP o. ' trong lõi bô. di. nh tuyến trong ma. ng di. ch vu. khác biê. t. Su. ' du. ng phu. o. ng pháp này, ta có thê ' chia ló. p AF thành các ló. p con AF ij mô. t cách dễ dàng. Tuy nhiên, hiê. u nȃng cu ' a hê. thống sẽ tốt ho. n khi co. chế có kha ' nȃng diề u khiê ' n tȃc nghẽn và chia se ' công bȃng giũ. a các ló. p con trong ló. p AF .
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