End-to-End Quality of Service in Evolved Packet Systems

End-to-End Quality of Service in Evolved Packet Systems

Wei Wu, Noun Choi
Copyright: © 2010 |Pages: 16
DOI: 10.4018/978-1-61520-674-2.ch016
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Abstract

The recent emergence of new IP-based services that require high bandwidth and low service latency such as voice over IP (VoIP), video sharing, and music streaming have motivated the 3rd Generation Partnership Project (3GPP) to work on the all IP-based cellular networks called Evolved Packet System (EPS). It is challenging for EPS not only to meet the Quality of Service (QoS) requirements of new services but also to make sure the QoS of existing services not impacted. In this chapter, the authors will first present an overview of EPS, and then focus on the aspects of QoS principles and mechanisms in EPS. End-to-end QoS models have been developed to analyze the application performance in EPS. Simulation results have shown that VoIP service requires resource reservation to guarantee its QoS requirement, and e-mail service does not experience significant performance degradation even when assigned a low service priority and the system experiences short period congestion. However, web browsing performance may not be improved proportionally to the network bandwidth increase due to the inherent network probing procedure of the transport protocol.
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Background

Current generation mobile cellular networks such as Global System for Mobile Communications (GSM), Enhanced Data Rates for GSM Evolution (EDGE) and Universal Mobile Telecommunications System (UMTS) have been designed for the circuit-switched voice service and low to medium bit rate data services such as e-mail and web browsing. The recent emergence of new IP-based services that require high bandwidth and low service latency such as voice over IP (VoIP), video sharing, and music streaming have motivated the 3rd Generation Partnership Project (3GPP) to work on the all IP-based cellular networks called Evolved Packet System (EPS). Compared to the existing systems, the EPS is targeting to provide higher user data rates, reduced latency, improved system capacity and coverage, reduced network complexity and lower operating costs. The following lists some of the major performance objectives of the EPS (3GPP TS 22.278, 2008; 3GPP TS 25.913, 2008):

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    To support instantaneous peak data rates of 100 Mbps on the downlink and 50 Mbps on the uplink in the radio access network.

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    To provide low user and control plane latency with a target of less than 10 ms user plane radio access network round-trip time (RTT) and less than 100 ms channel setup delay.

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    To be capable of supporting large amount of mixed traffic including voice, data and multimedia.

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    To optimize the level of system complexity and mobility management signaling in order to reduce infrastructure and operating costs. UE battery consumption shall also be minimized accordingly.

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    The interruption time during handover shall not exceed the 300 ms for real-time services and 500 ms for non-real-time services.

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