Suhaimi Abd Latif

Fuzzy Logic based Handoff Latency Reduction Mechanism in Layer 2 of Heterogeneous Mobile IPv6 Networks

Mobile IPv6 (MIPv6) is one of the pioneer standards that support mobility in IPv6 environment. It has been designed to support different types of technologies for providing seamless communications in next generation network. However, MIPv6 and subsequent standards have some limitations due to its handoff latency. In this paper, a fuzzy logic based mechanism is proposed to reduce the handoff latency of MIPv6 for Layer 2 (L2) by scanning the Access Points (APs) while the Mobile Node (MN) is moving among different APs. Handoff latency occurs when the MN switches from one AP to another in L2. Heterogeneous network is considered in this research in order to reduce the delays in L2. Received Signal Strength Indicator (RSSI) and velocity of the MN are considered as the input of fuzzy logic technique. This technique helps the MN to measure optimum signal quality from APs for the speedy mobile node based on fuzzy logic input rules and makes a list of interfaces. A suitable interface from the list of available interfaces can be selected like WiFi, WiMAX or GSM. Simulation results show 55% handoff latency reduction and 50% packet loss improvement in L2 compared to standard to MIPv6.

A review on mobile cloud computing and issues in it

Cloud computing is one of the emerging technology in this modern era. Some years back, this concept was related to only simple desktop computers or personal computers and static data centers and so on but now research is going on to implement this concept to mobiles also. So, in this paper, the concept of cloud computing as a general is given, followed by concept of mobile computing along with the general issues which are creating hindrances in completing this technology.

Performance analysis of IIUM wireless campus network

International Islamic University Malaysia (IIUM) is one of the leading universities in the world in terms of quality of education that has been achieved due to providing numerous facilities including wireless services to every enrolled student. The quality of this wireless service is controlled and monitored by Information Technology Division (ITD), an ISO standardized organization under the university. This paper aims to investigate the constraints of wireless campus network of IIUM. It evaluates the performance of the IIUM wireless campus network in terms of delay, throughput and jitter. QualNet 5.2 simulator tool has employed to measure these performances of IIUM wireless campus network. The observation from the simulation result could be one of the influencing factors in improving wireless services for ITD and further improvement.

Impact of Key Factors on Average Jitter in MANET

MANET or mobile Adhoc network is that network which is infrastructure less and does not need any centralized support. In this network, mobile nodes are equipped with CSMA CA (carrier sense multiple access with collision avoidance) transceivers and communicate with each other via radio. This network is a kind of temporary network and is best suited for emergency purposes. Most of the studies have focused on comparing protocols with each other under varying network conditions. But to the best of our knowledge no one has studied effect of different factors on network performance indicators like throughput, Jitter and so on, as how much influence a particular factor or group of factors is having on network performance indicators itself. Thus, in this paper effect of three key factors i.e. routing protocol, packet size and DSSS rate will be evaluated on one of the key network performance metric i.e. Average Jitter, as this parameter is most crucial for network performance as it directly affects the buffering requirements for all video devices and downstream network. Also excess value of jitter can lead to many problems ranging from lip-synchronization problem to the loss of packets because of buffer overflow or underflow.

Effect of Mobility Model and Packet Size on Throughput in MANET's

Ad-hoc mobile/802.11 networks are those networks which has got no fixed topology due to the movement of end nodes. Each node within mobile adhoc network can act both host as well as router. For these mobile nodes to be properly functional and operational, routing protocol is required. And for this very purpose, studies have been going on, which protocol is better. Little emphasis has been laid on network Performance indicators as which factors are most important for a specific Performance indicator. To the best of our knowledge no one has studied effect of different factors on network performance indicators like throughput, Delay and so on, as how much influence a particular factor or group of factors is having on network performance indicators itself Thus, in this paper, effect of routing protocol, packet size and node mobility pause time have been evaluated against one of the most important network performance metric i.e. throughput.

An Analytical Model for MAC Protocol Configuration in WLAN

The configuration of WLAN MAC by means of Super Frame (SF) and Contention Free Period (CFP) variation is one of the effective schemes to provide appropriate QoS to interactive multimedia (IMM) traffic. In this paper we investigate the usefulness of a dynamic auto-generated parameter set of CFP and SF combinations as the logical look-up table for the WLAN medium access control scheme. A modified analytical model is used to generate these optimum configurations by minimizing wastage in CFP constrained by the minimum wastage in CP.

Performance Evaluation of Seed Values and Pause Times over High Speed Wireless Campus Network in IEEE802.11e

IEEE802.11e standard assures to provide QoS using service differentiation mechanism over WLAN. The Enhanced Distributed Channel Access (EDCA) mechanism employs to differentiate the multimedia traffic based on assigned priorities and allows accessing the channel. Only one category of traffic permits access to the channel at a time to avoid traffic collision over the network. In EDCA, the back-off window algorithm generates back-off window size randomly during traffic transmission through the channel to prevent other categories of traffic to access the channel. Due to this randomness of back-off window algorithm to provide probabilistic QoS to satisfy the multimedia traffic through the network, the random mobility model can reduce the network performance. In this paper, we analyze the proposed network performance based on the variation of randomness using different seed values according to different pause time and evaluate the network performance using various performance metrics in IEEE802.11e.

Performance Analysis on Location Update Cost of Multihoming-Based Scheme in NEMO

The protocol which is considered as a most widespread Mobility Management Protocol (MMP) is entitled as Network Mobility Basic Support Protocol (NEMO BSP). The foremost function of NEMO BSP is to maintain the ongoing Internet connectivity at the time of handoff among different access networks through establishing a tunnel among Mobile Router (MR) and its Home Agent (HA). Nevertheless, NEMO BSP inherits several shortcomings namely higher handoff latency and packet loss. This causes performance destruction for the real time scenarios (i.e. Video streaming) seriatim on Mobile Network Nodes (MNNs) and fails to ensure seamless handover in mobile networks. This effect is predominantly significant in wireless environment. Accordingly, it can preserve seamless handoff by using a number of interfaces in NEMO. In this paper, a basic synopsis on mobility management in multihomed networks is given in a combined manner. Likewise, it evaluates Location Update Cost (LUC) by qualitative analysis to expose that multihoming-based scheme possess minor cost than NEMO BSP.

Dynamic Superframe Selection Scheme for High-Speed Wireless Networks

The configuration of WLAN MAC by means of Super Frame (SF) and Contention Free Period (CFP) variation is one of the effective schemes to provide QoS to interactive multimedia (IMM) traffic. In this paper we investigate the usefulness of an auto-generated dynamic parameter set of CFP and SF combinations as the logical look-up table for the WLAN medium access control scheme. A modified analytical model is used to generate these optimum configurations by minimizing wastage in CFP constrained by the minimum wastage in CP.