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QoS support in MANETs is challenging because of unfavourable conditions such as a dynamic topology, limited bandwidth and energy constraints. In the past decade, significant effort has been devoted to QoS routing design which fails to obtain a one-for-all solution for MANETs. This reason, it is believed, is the application dependent nature of routing protocols. Moreover, few researchers consider the...
- This paper proposes a novel multipath routing protocol for MANETs. The proposed protocol is a variant of the single path AODV routing protocol. The proposed multipath routing protocol establishes node-disjoint paths that have the lowest delays based on the interaction of many factors from different layers. Other delay aware MANETs routing protocols don't consider the projected contribution of the...
Increasing attention has been drawn in Machine Type Communications (MTC), also known as Machine to Machine (M2M) Communications, since it enables implementation of new services, and expansion of revenue sources for mobile equipment manufacturers and mobile network operators. This potential is high, but some issues have to be solved to enable the wide application of MTC services, especially those which...
Communications in highly mobile vehicular networks are challenging and have gained great attention in recent decades. One promising candidate is the IEEE 1609/802.11(p) network standard suite [1][2][3][4][5][6], which is evolved from the commodity 802.11 technology and revised for vehicular environments. Over the non-safety applications in vehicle networks, group communications are expected to enhance...
In the past, network operators were content with offering simple services such as voice and text messaging. However, they began to notice that these services were generating lower revenues even while the number of subscribers increased. Network operators are now forced to rapidly deploy value added services with minimum capital investment while maximising revenue from service usage by end users. Network...
One of the most interesting applications of single — sided Quality of Experience (QoE) metrics is their use in improving the quality of the service, as perceived by the user. This can be done either at the application level — by for example changing the encoding in use, or the level of error correction applied — or at the network level, for instance by choosing a different DiffServ marking strategy,...
Most reactive routing protocols hoc wireless networks rely on a broadcast algorithm known as flooding for route discovery. With flooding, many copies of each message are retransmitted unnecessarily resulting in a sub-optimal resource consumption. Given that mobile devices usually have limited power and computational resources, it is of the utmost importance to reduce the resource consumption of each...
The apps paradigm is rapidly changing the way in which content is transferred and consumed in mobile networks. Currently, the traffic loads generated by apps are mostly provided as Over-The-Top (OTT) services, essentially transparent to the cellular network operators, while some of the content is delivered and updated in user terminals through “background transmissions”, without user intervention...
In mobile Ad-hoc networks forwarding data through intermediate relays extends the coverage area and enhances the network throughput. Dynamic assignment of routes for data transmission from sources to destinations that is optimized based on channel conditions in a cross-layer manner could provide improved performance. We consider a general multiuser two-hop transmission, where each flow is subject...
We propose a new scheme for reliable transport, both for unicast and multicast flows, in Delay Tolerant Networks (DTNs). Reliability is ensured through the use of Global Selective ACKnowledgements (G-SACKs) which contain detailed (and potentially global) information about the receipt of packets at all the destinations. The motivation for using G-SACKs comes from the observation that one should take...
Network mobility support is a matter of great concern in mobile IPv6. The authors have proposed an innovative scheme for handling the delay due to handover. The proposed scheme aims to free Mobility Anchor Point (MAP) from overload, while guaranteeing low latency due to handoff.
Two recent trends are major motivators for service component migration: the upcoming use of cloud-based services and the increasing number of mobile users accessing Internet-based services via wireless networks. While cloud-based services target the vision of Software as a Service, where services are ubiquitously available, mobile use leads to varying connectivity properties. In spite of temporary...
A lot of research effort has been put by researchers in developing routing protocols for Mobile Ad-hoc Networks (MANETs). Each protocol proposed and designed so far has its own merits and demerits. Researchers around the world continue to develop novel, advanced routing protocols that can route messages towards their destination in an efficient way while consuming minimum amounts of resources. In...
Multiparameter m-health scenarios with bandwidth demanding requirements will be one of key applications in future 4G mobile communication systems. These applications will potentially require specific spectrum allocations with higher quality of service requirements. Furthermore, one of the key 4G technologies targeting m-health will be medical applications based on WiMAX systems. Hence, it is timely...
In this paper, we propose a group handover scheme in heterogeneous vehicular networks, which seeks to not only maximize system throughput but also make sure the load of all candidate access networks are maintained at the target load level. With mobility prediction information, we formulate the handover scheme as a multi-assignment problem, and develop an auction-based method to solve such problem...
In IP-based wireless/mobile networks, mobility support is one of the most critical issues. Hierarchical Mobile IPv6 (HMIPv6) was proposed by Internet Engineering Task Force (IETF) to mitigate the high signaling overhead in Mobile IPv6 networks when mobile nodes (MNs) perform frequent hand-offs. Although the standardization process of the HMIPv6 specification has been almost completed in IETF, there...
The fundamental challenge in opportunistic networking, regardless of the application, is enabling node cooperation in order to forward a message. While node cooperation is considered as a fundamental property in such networks, ensuring such a property between two devices in mobile opportunistic networks remains largely unexplored. In this paper, we investigate the potential impact of the lack of trust...
We characterize some fundamental performance limits of partially covered, intermittently connected, delay-tolerant networks (DTNs) that are comprised of a hybrid mix of mobile and static nodes (i.e., access points). Specifically, we derive theoretic bounds on the expected hitting time between two consecutive visits of a mobile node to access points for both the square and hexagonal access point deployment...
Social forwarding, recently a hot topic in mobile opportunistic networking, faces extreme challenges from potentially large numbers of mobile nodes, vast areas, and limited communication resources. Such conditions render forwarding more challenging in large-scale networks. We observe that forwarding techniques based on social popularity fail to efficiently forward messages in large scale networks...
In the past years there has been substantial amount of research focused on the transition mechanisms to allow the Internet to gradually evolve into a fully fledged IPv6 network. With the prevalence of smartphones, internet tablets and netbooks, a large portion of the end users has become truly mobile. Now, that all of the remaining IPv4 addresses have been allocated, the transition from IPv4 to IPv6...
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