Analytic approximation of the jitter incurred by CBR traffics in IP networks

Brun, Olivier; Bockstal, C.; Garcia, Jean-Marie

doi:10.1007/s11235-006-9005-1

Cited by 16 publications

(3 citation statements)

References 29 publications

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“…In [13], the authors provided a complete characterization of the jitter process when the tagged stream and the background traffic are constant bit rate. A simple analytical approximation for the delay jitter incurred by a periodic stream multiplexed with a background traffic and governed by a general renewal process is described in [2].…”

Section: Previous Workmentioning

confidence: 99%

An analytical model for jitter in IP networks

2011

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Traditionally, IP network planning and design is mostly based on the average delay or loss constraints which can often be easily calculated. Jitter, on the other hand, is much more difficult to evaluate, but it is particularly important to manage the QoS of realtime and interactive services such as VoIP and streaming video. In this paper, we present simple formulas for the jitter of Poisson traffic in a single queue that can be quickly calculated . It takes into account the packets delay correlation and also the correlation of tandem queues that have a significant impact on the end-to-end jitter. We then extend them to the end-to-end jitter of a tagged stream based on a tandem queueing network. The results given by the model are then compared with event-driven simulations. We find that they are very accurate for Poisson traffic over a wide range of traffic loads and more importantly that they yield conservative values for the jitter so that they can be used in network design procedures. We also find some very counterintuitive results. We show that jitter actually decreases with increasing load and the total jitter on a path depends on the position of congested links on that path. We finally point out some consequences of these results for network design procedures.

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Section: Previous Workmentioning

confidence: 99%

An analytical model for jitter in IP networks

2011

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“…In the last decade, some studies have been devoted to estimating of delay jitter by the steady-state analysis method. Due to the complexity of the practical service mechanism, most of these works have been done in the context that the service time was abstracted as a certain distribution, for example, exponential distribution [15], [16] and deterministic distribution [17], [18]. Our team analyzed the average delay jitter for the tandem queuing system model, where the service time was assumed to be geometrically distributed [19].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Access Delay and Delay Jitter for the CSMA/CA Mechanism with Inactive Period

F.¹,

Zhang²,

Zhao³

et al. 2019

RADIOENGINEERING

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Owing to the distributed features and flexibility, carrier sense multiple access with collision avoidance (CSMA/CA) mechanisms have been widely adopted in wireless networks. Considering energy consumption, we devote to exploring an energy efficient carrier sense multiple access with collision avoidance (EE-CSMA/CA) mechanism. The access delay and delay jitter are two of most important quality of service (QoS) metrics. EE-CSMA/CA inevitably experiences the tortures bred from its delay and delay jitter performance, because its frame structure with inactive period brings delay. In this paper, we aim to analyze the access delay and delay jitter of packets for the CSMA/CA with inactive period under the unsaturated conditions. Based on the Markov theory, we model the mechanism of EE-CSMA/CA as a four-dimensional Markov chain, and the fourth variable of Markov chain differentiates the active period and the inactive period of EE-CSMA/CA. Then, deriving in probability generation domain, we get the probability distribution of service time and obtain the access delay. Finally, the queue in a node is decoupled, and two queues with different states of empty and non-empty are configured logically, which helps to enable the complex analysis of delay jitter. Based on the whole probability analysis, the probability distribution of delay jitter is obtained. We show that the active ratio (active time over whole frame time) affects the access delay and delay jitter. When the active ratio is constant, the duration of active period has less effect on the access delay while it deteriorates delay jitter performance.

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“…Brun et al [6] provided an analytic model for estimating delay and jitter for CBR traffic, with background traffic injected at each intermediate node. Jitter has also been analyzed in [7], [9].…”

Section: Introductionmentioning

confidence: 99%

A Performance Study of CPRI over Ethernet with IEEE 802.1Qbu and 802.1Qbv Enhancements

Wan¹,

Ashwood-Smith²

2014

2015 IEEE Global Communications Conference (GLOBECOM)

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There has been a debate on whether or not Ethernet, a highly cost effective technology, could meet the stringent latency and jitter requirements imposed by CPRI. To facilitate the discussion, we conducted simulations to understand how Ethernet performs when carrying CPRI traffic with the two Ethernet enhancements, currently being standardized by IEEE, namely frame preemption (802.1Qbu) and scheduled traffic (802.1Qbv). Our simulation results led to two conclusions: 1) Ethernet networks with or without frame preemption, regardless of being shared or dedicated to CPRI traffic, can not meet the CPRI jitter requirement of 8.138 ns, confirming a widely hold belief; 2) Ethernet with the enhancement of scheduled traffic in conjunction with a well defined scheduling algorithm could significantly lower or even completely remove jitter thus could meet CPRI jitter requirement. To the best of our knowledge, this paper is among the first to study the performance of Ethernet with IEEE 802.1Qbu and 802.1Qbv enhancements and to demonstrate by simulation that Ethernet with scheduled traffic could meet CPRI jitter requirement.

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Analytic approximation of the jitter incurred by CBR traffics in IP networks

Cited by 16 publications

References 29 publications

An analytical model for jitter in IP networks

An analytical model for jitter in IP networks

Analysis of Access Delay and Delay Jitter for the CSMA/CA Mechanism with Inactive Period

A Performance Study of CPRI over Ethernet with IEEE 802.1Qbu and 802.1Qbv Enhancements

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