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Release-8 (Rel-8) EPS (Evolved Packet System) introduced a multi access 3GPP system where different heterogeneous access systems are connected to a common core network. However, in the system, the subscriber cannot communicate using multiple accesses simultaneously. Mobile devices with multiple interfaces are becoming commonly available and the set of applications running on the devices is diversifying...
In this paper, we propose a novel end-to-end resource allocation approach for wireless mesh networks with quality-of-service (QoS) assurance. By introducing additional interference tolerability to each multimedia flow, our proposed approach is shown effective in fostering frequency reuse and increasing the number of multimedia flows supported in the system, outperforming its conventional resource...
Cities around the world have planned and implemented large-scale wireless mesh network deployments. These mesh deployments are expected to provide broadband mobile access to the Internet at a low-cost to the user. This paper considers the fairness problem for nodes in multihop wireless mesh networks. Many existing approaches are unsuitable because they require modifications to the IEEE 802.11 MAC...
Recently, Variable-structure Congestion-control Protocol (VCP) has emerged as a great practical alternative of deployment for congestion control by requiring the use of only two ECN bits in the IP header. However, VCP suffers from a relatively low speed of convergence and exhibits biased fairness in moderate bandwidth high delay networks due to utilizing an insufficient amount of congestion feedback...
In this paper we explore a fundamental joint routing and scheduling problem in wireless mesh networks (WMNs) that employ time division multiple access (TDMA). The problem, referred to as the minimum cost single flow routing and scheduling (MC-SFRS) problem, deals with incremental update of transmission schedules necessitated by dynamic arrival of new flows and termination of existing flows during...
As wireless IP-based networks become more popular and larger in size and coverage, simple mobility management protocols cannot deal with the demands. With the growing access to the Internet, mobility can be divided into macro/micro-mobility domains. Macro-mobility can be efficiently handled with Mobile IP and its derivatives but they do not scale that well for the micro-mobility case. An alternative...
QoS routing in wireless mesh networks (WMNs) is a daunting task. Finding a path for a given flow depends not only on the bandwidth-delay requirements of that flow but also on the available bandwidth of all the nodes in that path and the amount of bandwidth consumption caused by that flow along its path. Contrary to the wired networks, these two parameters are not fixed and depend on the interference...
In this paper, we study the fairness problem for downlink traffic in multi-hop wireless backhaul networks with selfish nodes, including Transit Access Points (TAPs) and the gateway. Unlike the transmission of uplink traffic in which transit packets are dropped at intermediate TAPs, almost all downlink link traffic is dropped at the gateway. Therefore, we design an incentive-based mechanism where the...
This paper proposes a novel data-aggregation approach for capacity planning of a wireless sensor network (WSN). The approach is based on incorporating the three sensor's tasks, which are sensing, processing and transmission, into a task flow graph (TFG); moreover all TFGs within WSN are merged into one super task flow graph (STFG). Also, we have modeled the execution time of transmission task as non-preemptive...
In recent years, IMS architectures standardized by 3GPP have gained importance as the key technologies for the Next Generation Network that will provide high quality services over an IP network. These systems are being put to practical use and are mainly maintained and operated by telecommunication operators. In the future, deployment of new IMS services such as an IMS-based IPTV service and IMS-based...
Controlled mobile helper nodes called data ferries have recently been proposed to bridge communications between disconnected nodes in a delay-tolerant manner. While existing work has explored various trajectory designs for the data ferry by assuming either static nodes or full observations at the data ferry, the problem remains open when the nodes are mobile and the ferry only has partial observations...
In a saturating telecommunications marketplace network operators want to rapidly deploy services with minimum capital investment, while maximizing on revenue from service usage by customers. One way to achieve this is to create interfaces for 3rd party service and content providers to offer their applications and services to users. Composing and bundling of these services will essentially create new...
Available doorbell interphone systems are designed under the assumption that residents would be at home to enable the communication between them and their visitors. However, people spend a large fraction of their time away from home, thus undermining the basic assumptions of existing doorbell solutions. Recent developments in 3GPP Home Node B (HNB or Femtocell) and home gateway technologies, along...
Service discovery in Ubiquitous Sensor Networks has been targeted mostly for services available within certain proximity, but the service availability only in close vicinity is no longer feasible in the pervasive and ubiquitous era. In order to address the ubiquity in service discovery, we have proposed a framework that makes use of the Electronic Number Mapping (ENUM) protocol. Our network architecture...
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