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Due to the US Government's cancellation of the Transformational Satellite Communications (TSAT) program, Internet Protocol (IP) networking using Military Satellite Communications (MILSATCOM) is not currently planned. In order to support military IP based communications over MILSATCOM systems; affordable, effective and efficient solutions must be developed. An alternate near-term MILSATCOM networking...
IP Multimedia Subsystem (IMS), an architectural framework for delivering multimedia services standardized by Third Generation Partnership (3GPP/3GPP2), is deployed as part of 3G and beyond wireless networks. It facilitates wireless carriers to offer rich multimedia services such as Chat, Presence, and Video Conference with a high degree of flexibility. These services vary in terms of their delay sensitivity...
Multirate digital signal processing (DSP) algorithms are often modeled with synchronous dataflow graphs (SDFGs). A lower iteration period implies a faster execution of a DSP algorithm. Retiming is a simple but efficient graph transformation technique for performance optimization, which can decrease the iteration period without affecting functionality. In this paper, we deal with two problems: feasible...
High reliability and performance are needed as the Internet becomes an important social infrastructure. Network delay is one of measures of performance of network. As delay between two nodes correlates roughly with the distance between them, the diameter of the network which is the maximum distance of all two nodes must be small. In addition, it is necessary to keep small network delay against network...
Network evolution towards self-aware autonomous adaptive networking aims at reducing the burden of configuring and managing networks, which leads to performance degradation. In order to optimize network operations, the introduction of self-awareness, self-management, and self-healing into the network was proposed, leading to a novel paradigm in networking - known as cognitive networking. This paper...
OSPF is one of the routing protocols which is the most widely used in internet and intranet today. The link-state algorithm in OSPF is based on the thought of local optimization, but in certain cases, routing algorithms based on local optimization might lead to a disadvantage which will remarkably depress global performances. A self-adaptive method based on the genetic algorithm is proposed, which...
As fabrication process exploits even deeper submicron technology, global interconnect delay is becoming one of the most critical performance obstacles in system-on-chip (SoC) designs nowadays. Recent years latency-insensitive system (LIS), which enables multicycle communication to tolerate variant interconnect delay without substantially modifying pre-designed IP cores, has been proposed to conquer...
Delivering desired QoS to the applications is one of the most important challenges in next generation networks. Designing efficient queue management in midway nodes leads to improvement in NGN efficiency. This paper presents fair Efficient active Queue Management (EQM) mechanism for congestion avoidance and control in next generation networks. Proposed AQM mechanism uses instantaneous queue length...
The performance of wireless LANs is greatly affected by path loss, RF interference and other sources of signal attenuation in addition to network congestion. The primary factors involved in effective real-time communication, namely delay and loss, must be within certain controlled limits in such a scenario. In this paper, we analyze the various factors driving IEEE 802.11b access points through extensive...
Overlay multicast is an effective approach to the problem of streaming distribution. Other approaches proposed for streaming, i.e., unicast transmission and IP multicast have several drawbacks. The former method is not scalable with the growing number of users. The latter method - IP multicast - requires strong cooperation with ISPs (Internet Service Providers) what is not always realizable due to...
Application-Layer Multicast (ALM) is considered a viable solution for compensating the lack of global IP Multicast deployment. While early ALM approaches consider only stationary end-systems, their use becomes more and more feasible on smaller devices like laptops and mobiles. Many ALM protocols have been proposed that employ multi-metric optimization strategies to consider e.g. delays, fanout-degrees,...
During interdomain handover, IPv6 node has to acquire new address at its new location. Once the L2 handover procedure is completed, mobile node (MN) starts its IPv6 configuration, using stateless (router advertisements) or stateful (DHCPv6 communication) mode. After the address is obtained, its uniqueness has to be verified, using Duplicate Address Detection (DAD) procedure. Depending on the interface...
Application Layer Multicast (ALM) has become a popular form of content distribution. It shows some favourable properties like inherent scalability and the overcoming of the traditional client-server bottleneck. In the future, a large fraction of the participants in ALM systems will be mobile (eg. smart-phones or netbooks) and demand for a proper inclusion and mobility handling. After analyzing current...
Due to widespread deployments of Vehicular Area Networks (VANs) and the increasing affordability of mobile data and smart mobile devices, there is an increasing demand for accessing applications and services on-the-go. As a result, group mobility scenarios have emerged, especially over VANs on public transport networks (e.g., buses, trains, aircraft, and so on). Therefore, when a group of users roam...
IP Multimedia Subsystem (IMS) is very important due to the critical role it plays in the Next Generation Network (NGN) of the Fixed and Mobile Networks. Voice traffic in IMS will be served using Internet Protocol (IP) which is called Voice over IP (VoIP). This paper uses the "E-Model", (ITU-T G.107), as an optimization tool to select network and voice parameters like coding scheme, packet...
The problem how to improve the quality of server(QoS) of the heterogeneous network must be studied and solved, for long round trip times (RTTs), not negligible packet error rates (PER), and downlink-uplink asymmetry, etc. Posing new challenges to the QoS given by transmission control protocol (TCP). the paper proposes a Diff-selective(diff-sel) policy, which can solve the problem by selecting different...
In IP networks, a voice quality suffers from the uncertainness of the packet-switch network characteristics. In particular, delay variation, the so-called jitter, can cause the packet-loss effect, resulting in sound degradation. An adaptive playout-buffer scheduling algorithm is used to overcome the packet-loss effect caused by the jitter. A distribution-based approach provides an analytical scheduling...
Among the route optimization schemes in NEtwork MObility (NEMO), the prefix delegation-based schemes perform better than other schemes. Since the prefix delegation-based schemes are designed for communication between a mobile network and a wired network, they lack evaluation for the case of intra mobile network communication involving MIPv6 incapable hosts in a mobile network. We evaluate prefix delegation-based...
In order to bear reliable end-to-end services transmission in insecure IP network, SCTP as the transport protocol of the next-generation Internet was proposed. The performance of SCTP has been improved in related literature; however, they optimized it based on a single or a few parameters, which is lack of a comprehensive consideration in correlation parameters. In consideration of real-time and the...
New architectures have recently been proposed and deployed to support end-to-end advance reservation of network resources. These architectures rely on the use a centralized scheduler, which may be unpractical in large or administratively heterogeneous networks. In this work, we explore and demonstrate the feasibility of implementing distributed solutions for advance reservation. We introduce a new...
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