On traffic types and service classes in the Internet

Abstract. In recent years there has been an explosive growth on the use of wireless video communications. Despite much research in this field, the deployment of effective QoS-aware real-time video services over wireless channels remains a challenging task. In this paper, we first introduce and describe an overall system architecture capable of offering true end-to-end QoS guarantees to MPEG-4 video services running over TDMA/TDD wireless networks. The proposed system architecture is built by integrating two key system elements: a set of control mechanisms and various error resilient techniques. After reviewing the various system elements, we evaluate the use of the various mechanisms. We show the effectiveness of the proposed architecture in terms of various metrics. Our results show that the video quality as perceived by the end user can be significantly improved by making use of hierarchical video coding techniques.

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“…These time limits are in line with the values specified by standards and in literature [9]. A packet exceeding this upper bound is dropped.…”

Section: Metricssupporting

confidence: 69%

QoS-Aware Video Communications over TDMA/TDD Wireless Networks

Delicado

Cuenca

Orozco-Barbosa

2006

Personal Wireless Communications

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“…Our work [15] shows that since voice and CBR video have similar characteristics and real-time delay requirements, we may allow them to be handled together. Consider a scenario in which CBR video streams are added to a 7-hop 10Base-T network carrying a 450 Kbps aggregate voice load.…”

Section: Mixing Voice and Videomentioning

confidence: 99%

“…In [15], we investigate the effect of mixing and separating traffic types, i.e., which types can be mixed together in the same queue without incurring a significant loss in throughput, and which types need to be separated to meet performance objectives. We first consider the impact of data traffic on voice traffic by mixing 1 Mbps of voice traffic (11 streams) with TCP data traffic.…”

Section: Mixing Voice and Datamentioning

confidence: 99%

Service Differentiation in the Internet to Support Multimedia Traffic

Tobagi

Noureddine

Chen

et al. 2001

Lecture Notes in Computer Science

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Abstract. The current best-effort infrastructure in the Internet lacks key characteristics in terms of delay, jitter, and loss, which are required for multimedia applications (voice, video, and data). Recently, significant progress has been made toward specifying the service differentiation to be provided in the Internet for supporting multimedia applications. In this paper, we identify the main traffic types, discuss their characteristics and requirements, and give recommendations on the treatment of the different types in network queues. Simulation and measurement results are used to assess the benefits of service differentiation on the performance of applications.

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“…Because of these stringent requirements and particular characteristics, voice traffic should be treated differently than other traffic in the network. In fact, measurements on the Internet [25] as well as simulation studies [19] have shown that mixing voice traffic with both traditional TCP data traffic and UDP VBR video traffic can lead to either low average link utilization if delay requirements are met, or larger than desired delay for voice. Accordingly, allowing a mixture of voice with other traffic can lead to the need of complex admission control policies if the end-to-end delay requirements for voice were to be satisfied [19].…”

Section: Introductionmentioning

confidence: 99%

Analysis of delay and delay jitter of voice traffic in the Internet

Karam

Tobagi

2002

Computer Networks

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In the future, voice communication is expected to migrate from the public switched telephone network to the Internet. Because of the particular characteristics (low volume and burstiness) and stringent delay and loss requirements of voice traffic, it is important to separate voice traffic from other traffic in the network by providing it with a separate queue. In this study, we conduct a thorough assessment of voice delay in this context. We conclude that priority queuing is the most appropriate scheduling scheme for the handling of voice traffic, while preemption of non-voice packets is strongly recommended for sub-10 Mbit/s links. We also find that per-connection custom packetization is in most cases futile, i.e. one packet size allows a good compromise between an adequate end-to-end delay and an efficient bandwidth utilization for voice traffic.

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On traffic types and service classes in the Internet

Cited by 26 publications

References 21 publications

QoS-Aware Video Communications over TDMA/TDD Wireless Networks

QoS-Aware Video Communications over TDMA/TDD Wireless Networks

Service Differentiation in the Internet to Support Multimedia Traffic

Analysis of delay and delay jitter of voice traffic in the Internet

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