Showing papers by "Wan Haslina Hassan published in 2013"

Challenges and opportunities of Mobile Cloud Computing

Abstract: Cloud Computing (CC) is fast becoming well known in the computing world as the latest technology. CC enables users to use resources as and when they are required. Mobile Cloud Computing (MCC) is an integration of the concept of cloud computing within a mobile environment, which removes barriers linked to the mobile devices' performance. Nevertheless, these new benefits are not problem-free entirely. Several common problems encountered by MCC are privacy, personal data management, identity authentication, and potential attacks. The security issues are a major hindrance in the mobile cloud computing's adaptability. This study begins by presenting the background of MCC including the various definitions, infrastructures, and applications. In addition, the current challenges and opportunities will be presented including the different approaches that have been adapted in studying MCC.

Wireless networks: developments, threats and countermeasures

Abstract: This paper discusses current threats in wireless networks and some academia research reviews regarding the matters. Significant and persistent threats discussed are sniffing, Man In the Middle Attack (MITM), Rogue Access Points (RAP), Denial Of Services (DoS) and social engineering attacks. Some current developments of wireless communication technology such as short range communication, cloud computing, bring your own device policy (BYOD), devices tethering and convergences of WiFi and cellular network technology are also presented. Some practical suggestion and advanced countermeasures are also reviewed in this paper. The findings from reviewing these research papers proved that the complexity of the attacks had increased by time and the attacks in WiFi network are passive and more dangerous to the end users.

A brief review of mobile cloud computing opportunities

Abstract: Cloud Computing (CC) is becoming popular as the latest technology in the infrastructure of the computing world. The CC allows the users to make use of the resources when needed. Mobile Cloud Computing (MCC) combines the cloud computing concept into a mobile setting and manages to deter barriers associated with performance of the mobile devices. However, this does not mean that there are no problems with these new advantages. MCC encounter some common security issues include personal data management, privacy, identity authentication, and potential attacks. The security problems are major obstacle in the mobile cloud computing paradigm’s swift adaptability. This study initially provides the background to MCC, which includes definitions, infrastructure and its applications. Furthermore, the different advantages of MCC will be highlighted in the study.

An enhanced macro mobility management scheme in NEMO environment to achieve seamless handoff

Abstract: In NEMO network, handoff is the process in which the Serving MR (SMR) needs to change its point of attachment to the network when it moves from one network to another new network. Usually during handover, firstly the SMR needs to be disconnected from the old network and then it gets connected to a new network. Thus there is a possibility to lose the connectivity from the Internet as well as its Home Agent (HA) and Correspondent Nodes (CNs). During this time, it becomes difficult to send or receive any data packets which results in packet loss and delay. Accordingly for real time applications that depend on timely packet delivery within certain acceptable thresholds will be sensitive to the length of time a SMR loses connectivity while performing handover. In case of this type of applications seamless handoff is generally expected which includes both features i.e. smooth (no or very little packet loss) as well as fast (low delay) handoff. But in accordance with NEMO Basic Support Protocol (NEMO BSP), only one primary Care of Address (CoA) of SMR can be registered with home agent, which affects the handoff performance resulting packet loss and delay. This paper presents an enhanced macro mobility management scheme for NEMO network which integrates improved FHMIPv6 with mobile networks. The main idea of the proposed macro mobility scheme is to apply the improved fast handoff mechanism for the SMR handoff with its Local Fixed Node (LFN) in NEMO network in order to achieve seamless handoff in terms of packet loss and delay. The performance of the proposed scheme is evaluated using simulation approach. The simulation is done using Network Simulator (NS-2). The simulation result shows that the proposed scheme outperforms the standard NEMO BSP in terms of packet loss (packet loss less than 6%).

A Prospective Study of Mobile Cloud Computing

Abstract: In today’s fast moving world, mobile devices such as smartphones, tablets, and other PDAs are a central component in achieving effective and convenient communication. In today fast developing world of IT and commerce, the growth of mobile computing (MC) has become a force to be reckoned with. However, it is not without its own set of challenges; these devices are dependent on battery life span, storage, bandwidth, and security and mobility. These challenges have slowed down the growth of the service quality of these devices. The intrinsic challenges of mobile computing are being overcome by imputing and saving data in cloud computing. It is done by using various service providers aside from the mobile device service providers for hosting the mobile applications’ delivery. Mobile cloud computing is a branch of cloud computing and it provides ease of use and mobility to its users. Mobile cloud computing is described as services of cloud computing that are available in mobile environment. This study offers thorough knowledge of the capabilities and challenges faced in mobile cloud computing.

Current threats of wireless networks

Abstract: This paper discusses current threats in wireless networks. Advancement and countermeasures for each threat such as sniffing, Man In the Middle Attack (MITM), Rogue Access Points (RAP), Denial Of Services (DoS) and social engineering are discussed in this paper. Some practical suggestions for service providers and users to mitigate the risks to the threats are also presented.

Inculcating awareness of sustainable development in first year engineering students - a comparative study of pedagogical approaches

Abstract: Understanding on the concept of sustainability is the main issue that should be addressed at the earlier stage of education where future engineers are being educated. The aim of this study reports on a comparative study on investigating the impact of pedagogical approaches in inculcating sustainable development amongst the first-year engineering students. Traditional learning and Cooperative Problem-Based Learning (CPBL) were implemented as a pedagogical approach in two different courses of first year engineering students. A mixed method research methodology was utilized to achieve the objective of this study. Results were compared and interpreted to determine the findings.

Architectural framework for mobile multicast support in wireless mesh networks

Abstract: A wireless mesh network (WMN) is an infrastructure multihop ad hoc network with broadband capabilities. Multicasting is an efficient mechanism for delivery of group communication. However, the current IEEE 802.11s standard has no provision for efficient group communication delivery. Furthermore, the disruption in internet connectivity and loss of information when a mobile mesh client changes its point of attachment may lead to disruption in an ongoing session. The internet gateway (IGW), a prominent component, serves as the wired bridge between the mesh nodes and the internet, thus its placement determines the overall quality of communication in WMNs. Accordingly, a structural design for supporting multicast services in this architecture is indispensable. The main question this paper addresses is how multicast can be efficiently supported for mobile mesh clients in WMN architecture. This paper adopts the technique of employing multicast architecture to solve mobility problems for mobile mesh clients. Thus a framework of novel architecture for supporting multicast services for group application delivery over WMN is presented. The proposed architecture features enhanced functionality of IGW, shared multicast tree, optimal design for IGW and core placement, hierarchical mobility management, load balancing, and robustness. The overall objective is the provision of cost efficient WMN architecture while mobile multicast traffic delivery is supported optimally. This is the first effort reporting multicast service support framework for mobile mesh clients with a focus on IGW placement and functionality.

Performance analysis of multi-radio routing protocol in cognitive radio ad hoc networks under different path failure rate

Abstract: In recent years, Cognitive Radio (CR) technology has largely attracted significant studies and research. Cognitive Radio Ad Hoc Network (CRAHN) is an emerging self-organized, multi-hop, wireless network which allows unlicensed users to opportunistically access available licensed spectrum bands for data communication under an intelligent and cautious manner. However, in CRAHNs, a lot of failures can easily occur during data transmission caused by PU (Primary User) activity, topology change, node fault, or link degradation. In this paper, an attempt has been made to evaluate the performance of the Multi-Radio Link-Quality Source Routing (MR-LQSR) protocol in CRAHNs under different path failure rate. In the MR-LQSR protocol, the Weighted Cumulative Expected Transmission Time (WCETT) is used as the routing metric. The simulations are carried out using the NS-2 simulator. The protocol performance is evaluated with respect to performance metrics like average throughput, packet loss, average end-to-end delay and average jitter. From the simulation results, it is observed that the number of path failures depends on the PUs number and mobility rate of SUs (Secondary Users). Moreover, the protocol performance is greatly affected when the path failure rate is high, leading to major service outages.

Incorporation of QoS in network mobility (NEMO) network

Abstract: The contemporary Internet that we have been using today is based on Best-Effort (BE) service only, where packets are assigned and forwarded with the same priority. The BE service is acceptable only for traditional Internet applications like e-mail, web browsing and file transfer. However, it is not adequate for the applications like video conferencing, voice over IP (VoIP), and Video on Demand (VoD), which require high bandwidth, low delay and delay variation. Obviously, with the emergence of new real-time applications and Quality of Service (QoS) requirements, the Best Effort service becomes insufficient. Therefore, the Internet community has developed a number of new technologies to provide QoS in the Internet such as IntServ, DiffServ and MPLS. The differentiated service (DiffServ) is the most important distinct technology due to its simplicity and scalability benefits. It has been endorsed by Internet Engineering Task Force (IETF) to satisfy the requirements of new real-time applications. Internet Protocol was not designed taking into account mobility of users and terminals. In few years later, the IETF has developed protocols such as Mobile IPv4 (MIP) and Mobile IPv6 (MIPv6) for supporting seamless connectivity to mobile hosts. Mobile IPv6 is considered one of the important host mobility protocols, which was defined more in (RFC 3775 and RFC 6275). Network mobility basic support protocol (RFC 3963) is an extension of Mobile IPv6. It has been endorsed by Internet Engineering Task Force (IETF) to allow every single node in the mobile network to be reachable and connectable to the Internet while the network itself is moving around. Ultimately, this paper aims to propose and develop a new scheme to enhance QoS within NEMO environment. Key words: Mobile IPv6, NEMO, Quality of Service, DiffServ.

Evaluation of QoS supported in Network Mobility NEMO environments

Abstract: Network mobility basic support (NEMO BS) protocol is an entire network, roaming as a unit which changes its point of attachment to the Internet and consequently its reachability in the network topology. NEMO BS doesn't provide QoS guarantees to its users same as traditional Internet IP and Mobile IPv6 as well. Typically, all the users will have same level of services without considering about their application requirements. This poses a problem to real-time applications that required QoS guarantees. To gain more effective control of the network, incorporated QoS is needed. Within QoS-enabled network the traffic flow can be distributed to various priorities. Also, the network bandwidth and resources can be allocated to different applications and users. Internet Engineering Task Force (IETF) working group has proposed several QoS solutions for static network such as IntServ, DiffServ and MPLS. These QoS solutions are designed in the context of a static environment (i.e. fixed hosts and networks). However, they are not fully adapted to mobile environments. They essentially demands to be extended and adjusted to meet up various challenges involved in mobile environments. With existing QoS mechanisms many proposals have been developed to provide QoS for individual mobile nodes (i.e. host mobility). In contrary, research based on the movement of the whole mobile network in IPv6 is still undertaking by the IETF working groups (i.e. network mobility). Few researches have been done in the area of providing QoS for roaming networks. Therefore, this paper aims to review and investigate (previous /and current) related works that have been developed to provide QoS in mobile network. Consequently, a new proposed scheme will be introduced to enhance QoS within NEMO environment, achieving by which seamless mobility to users of mobile network node (MNN).