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Long Term Evolution system represents the latest developments in the direction of UMTS standard. Radio Link Control Protocol layer protocol is an important component of LTE, and its data transmission function plays an important role in the LTE R & D. This paper is concerned with a study of the RLC layer protocol framework, state transitions, and AM mode transmission. Mainly realizes AM transmission...
This paper proposes efficient analytical models to dimension the required transport bandwidths for the Long Term Evolution (LTE) access network for the elastic Internet traffic (which is carried by the TCP protocol). The dimensioning models are based on the use of Processor Sharing queuing theory to guarantee a desired end-to-end application QoS target. For validating the analytical dimensioning models,...
802.11-based WLAN deployments have become a commodity to provide today's wireless Internet access. In this paper, we conduct a practical study on the performance of FTP file transfers over real WLAN equipment. To this end, we propose a new analytic model that translates the highly complex dynamics of the FTP/TCP/IP/MAC-stack, and their interactions, into a single parameter, which will be called the...
Most of future digital services for home and office users will be deployed and delivered through the Internet and wireless connectivity. However, employing regular access points (APs) and protocols will not allow an efficient coexistence among heterogeneous application flows. Indeed, real-time and elastic applications are (and will be) supported by different protocols and featured with different performance...
In cooperative systems, the fractional incremental relaying (FIR) protocol can achieve higher spectral efficiency than the traditional incremental relaying (IRL) protocol by transmitting a fraction of packet, instead of the whole packet, at a time when retransmission is needed. The incremental redundancy (IRD) protocol can also be utilized when retransmission is necessary. Based on the two protocols,...
TFRC over wireless access networks has poor performance because it accounts wireless losses as congestion losses. To solve the problem, an enhanced TFRC protocol based on step ECN marking is proposed. The simulations show that, with appropriate loss differentiation and congestion notification, the new protocol achieves much higher throughput than TFRC as well as keeps reasonable friendliness to TCP...
In the Internet, nodes are identified using IP addresses that depend on their topological location. IPv4/IPv6 translation technology involves address mapping between IPv6 and IPv4 nodes and the methods used to translate protocols, where nodes are in their respective IP version of network. The various IPv4 addressing mechanisms and addressing architectures are studied. The detailed study reveals that...
In this paper, we propose a spectrally efficient cooperative transmission protocol for multiple access scenarios. The key feature is to utilize multi-user diversity and fully exploit the dynamic nature of radio propagation. In particular, by carefully scheduling the multiple sources and relays' transmissions, a source with a poor connection to the destination can have higher priority to obtain help...
Nowadays, wireless connectivity is increasingly available in homes to support heterogeneous multimedia applications. However, with current off-the-shelf systems, real-time applications (e.g., video streaming, online games) suffer from delays caused by the interference with elastic (e.g., TCP-based downloading sessions) ones. Furthermore, simultaneous elastic application flows are not able to fairly...
Access networks based on cooper cables are costly to build and maintain. For this reason, last-mile access networks based on wireless technologies are gaining considerable attention. Among the wireless technologies being employed, the IEEE802.11 is common place. In such scenarios it is important to have well defined mechanisms to better evaluate traffic characteristics and overall system performance...
Factors such as the growing number of multimedia terminals, the constant increase of bandwidth available per user, and the large number of existing data sharing applications, are compelling users to generate and distribute their own content to restricted groups of other users. In order to support such scenario, we present an IMS-based solution that enables content distribution, in multicast, to groups...
Wireless mesh networks are emerging as a promising access network architecture. In this work, we report on an extensive measurement campaign performed over an experimental WiFi-based mesh network, deployed in an office building environment. The measurements are focused on the performance of HTTP traffic. Results demonstrate the existence of an unfairness issue, whereby longer sessions achieve better...
Handling mobility at the transport layer is a promising approach to achieve seamless handover in the context of heterogeneous wireless access networks. In particular, features such as multihoming and dynamic address reconfiguration provided by mobile SCTP (mSCTP) protocol are among the key enablers for handover support at the transport layer. This paper investigates the applicability of concurrent...
This paper presents delay and throughput performance results for a "cache-and-forward" (CNF) network architecture for mobile content delivery services. The CNF network uses hop-by-hop transport and in-network storage to deliver large media files to mobile users. The CNF protocol is designed to deal with fluctuating wireless link quality and occasional periods of disconnection, and is therefore...
In this study, feasibilities of HTTP specific acceleration and TCP optimization in mobile network are analyzed through comparisons. Based on these analyses, practicable accelerator architectures for Web latency reduction are presented. Furthermore, we proposed that a boost in performance is feasible by either deploying cooperative proxies with concurrent connection or combining the characteristics...
We propose in this paper, to replace the two layer 3 Handover mechanisms defined for the situation of macro mobility with IP address change in IEEE 802.16e: ldquoClient-MIP and Proxy-MIPrdquo, by the new protocol created specially for the mobility without services interruptions: ldquoMSCTPrdquo, which has the peculiarity to support several IP sessions at the same time.The purpose of this proposal...
Handling mobility at the transport layer is a promising approach to achieve seamless handover in the context of heterogeneous wireless access networks. In particular, features such as multihoming and dynamic address reconfiguration provided by mobile SCTP (mSCTP) protocol are among the key enablers for handover support at the transport layer. This paper investigates the applicability of Concurrent...
The Internet access paradigm is changing and a wide range of overlapping radio access technologies, such as WiMAX, Wi-Fi, 3GPP UMTS/LTE and DVB-H, will soon be available to most users and their multi-access devices. Therefore, novel mechanisms and protocols are needed to provide seamless mobility between different wireless access technologies. This paper presents novel handover procedures, based on...
In this paper we propose a novel method for associating Wireless Mobile Nodes (WMNs) to Access Points (APs) in busy wireless access networks. The proposed method associates each WMN with multiple APs for mitigating the load balancing problem in hot-spots. The method assumes that a concurrent multipath transport control protocol such as cmpTCP is used at the end-points. The connections are established...
Wireless mesh networks (WMNs) are emerging as a promising technology for backhauling data traffic from wireless access networks to the wired Internet. Such networks are expected to support various types of applications with different quality of service (QoS) requirements. In this paper, we provide a complete cross-layer solution for WMNs together with its OPNET simulation architecture that comprises...
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