Ahmad Kamil Abdul Hamid

Automatic originator regulation of IMS multiple traffic by stateless signaling prioritization

In emergent situations such as an earthquake, huge traffic from multiple services pours into IP Multimedia Subsystem (IMS) network and leads to a severe congestion problem. To protect IMS network, telecom companies usually take a measure of originator regulation on voice calls. However existing solutions are unable to maximize the service throughput for handling multiple services. This paper proposes an automatic originator regulation of IMS multiple traffic by stateless signal prioritization based on the types, message order and retransmissions of SIP messages within each call session. The best prioritization is to give a higher priority to a message type appearing at a later stage in each session and a lower priority to a retransmitted message. We also show the optimum queue length. For the effective confirmation of the safety at a disaster, an ideal communication system should pass more light-weight messages like instant messaging (IM) than those generated by voice calls. The simulation result shows the maximum throughput for each multimedia service is kept as in this ideal model even in an extremely congested situation with the 60 times larger offered load than usual which was observed in the 2011 earthquake off the Pacific coast of Tohoku.

Network management architecture toward universal communication

Ubiquity of networked devices is one of the first steps toward realization of universal communication services. However, not much attention has been paid to the management architecture of the mashed-up services provided across the network domains. Absence of the scalable cross-domain network management architecture restricts the availability and penetration of the service. In this paper, we propose Tambourine framework which defines a web service based a network management API. Tambourine allows applications to access to the management and control information of networked devices across the domains.

Web Cache Design for Efficient SNMP Monitoring Towards Realizing Globalization of Network Management

In this paper, we propose a RESTful active proxy, called Tambourine, towards realizing globalization in network management. Tambourine radically changes the landscape of traditional closed-domain SNMP monitoring into a multi-domain, multi-user monitoring activity by translating HTTP requests from a huge number of Internet users into adequate SNMP requests to network devices. Implementation of cache in Tambourine is vital to ensure that SNMP traffic is kept at a minimum level to avoid burdening network devices with repetitions of SNMP requests. Existing web cache technology however could not be implemented in Tambourine due to two main reasons (i) SNMP is not a cache-aware protocol, and (ii) the value for several OIDs, such as system uptime, changes in real-time causing stale data if it is cached. To solve these problems, our cache design applies a four-state transition to determine the optimum TTL for each OID. Tambourine also aggregates multiple HTTP requests from the same user into a single SNMP request to further reduce the SNMP traffic. In our experiments where three users used a modified MRTG to generate HTTP requests to Tambourine, our cache design converges to zero staleness ratio after five 5-minute cycles.

Design and Implementation of an AR-Assisted Tool for Basic Home Network Management

n this paper, we present TIARA, a tool aimed at home users for basic home network management. TIARA advantages are twofold. First, it exploits the benefits of Augmented Reality (AR) for visual identification of network devices during performing network management tasks. Second, it encapsulates technical jargons into common, day-to-day phrases. TIARA strength lies in its architecture that is loosely coupled and able to be implemented beyond home network. Built on an Android smart phone, TIARA provides a unified UI and portability for seamless operations. Our experiments have shown that TIARA yields only a fraction (of up to 15.1%) of the traditional method in completing basic management tasks. In addition, TIARA receives high scores in ease of use, satisfaction level and importance of TIARA in home network management.

Pantau: A Monitoring System for KVM-Based Server Consolidation Environment

Pantau is an on demand resource monitoring system that has the goal of providing data necessary for studying KVM based server consolidation environment. Instead of always collecting all resource values from all machines, users are able to control which values should be collected from which machines without having to modify any configuration files. This greatly reduces the overhead of our system. The evaluation of expected usage scenarios shows that our system consumes less than 1.8% CPU on a physical machine that hosts 8 VMs at 10 seconds monitoring interval. In addition to normal resource usages, it provides per VM process resource usage which captures the resource usage of all VM processes on target machines at a given time interval. Using Pantau, researchers can understand better the correlation between resource usages of related machines and also the correlation between application performance parameters and necessary resources. Pantau can be easily extended to monitor unsupported resource values. This paper presents the design, implementation and evaluation of our monitoring system along with a case study that shows how we can make use of the monitored data.