Seamless handover between different access technologies is a great challenge as it needs to obey ... more Seamless handover between different access technologies is a great challenge as it needs to obey different performance of QoS and security constraints. Subscribers are becoming more demanding regarding roaming capabilities across different networking technologies such as WiFi, WiMAX, and CDMA as they claim service continuity with QoS requirement and good security features. In this paper, a QoS based vertical handover mechanism between WiMAX and WiFi networks is proposed by applying the Signal to Interference and Noise Ratio SINR. The Media Independent Handover MIH (IEEE 802.21) protocol is adopted to assist in the handover decisions by providing a suitable platform for vertical handovers. The performance of the proposed SINR based vertical handover algorithm and RSS based vertical handover algorithm have been evaluated in terms of the maximum downlink throughputs.
We propose the desirable features or criteria to be considered when designing routing protocols f... more We propose the desirable features or criteria to be considered when designing routing protocols for mobile ad hoc networks (MANET). From a literature review to compare currently implemented routing protocols, we have identified the important features that should be included in the routing protocol. Looking at the current implementations, each routing protocol has its own particular features or criteria of merit. The mobile ad hoc network is expected to contribute a greater mobility service that will become a high demand.
This paper examines multicast traffic in single-hop local WDM lightwave networks based on a broad... more This paper examines multicast traffic in single-hop local WDM lightwave networks based on a broadcast-and-select system. We use an approximate analytical solution and Markov model to show the effect of tuning time on system performance. We also show the trade-off between average packet delay against number of channels and network offered load. Finally, we show the trade-off between blocking probability and network offered load.
Many network administrators or providers are hesitant or not ready to offer the users the informa... more Many network administrators or providers are hesitant or not ready to offer the users the information of current bandwidth utilization on their Internet connection or other connection. There are many justifiable and unjustifiable reasons for this. We believe in opening up the communication between the users and ourselves and also believe in honestly and accurately portraying the services we are receiving via our communication lines. This paper presents a case study on the performance analysis for State Government Telecommunication Network (Terengganu*Net) bandwidth utilizations and protocol distributions.
... Receiver Performance Characteristics for Multicast Traffic in WDM Optical Network Rabi W.Haba... more ... Receiver Performance Characteristics for Multicast Traffic in WDM Optical Network Rabi W.Habash', Borhanuddin Mohd. Ali2, Mohd Dani Baba', and Mohammad Ibrahim' 'Faculty of Electrical Engineering, Universiti Tehologi Mara 40450 Shah Alam, Selangor, Malaysia ...
The objective of this paper is to discuss on the implementation of cryptographic security algorit... more The objective of this paper is to discuss on the implementation of cryptographic security algorithms for radio telemetry using the graphical programming software from National Instruments known as LabVIEW. The telemetry system consists of a remote telemetry station (RTS) and base telemetry station (BTS) for acquiring and monitoring environmental conditions respectively. RTS setup includes a desktop computer integrated with a data acquisition system, 1200 bps modem and GP300 Motorola walkie talkie (see Ghodgaonkar, D.K. et al., IEEE Proceedings Malaysia Section 2nd National Conference on Telecommunications Technology, p.88-93, 1998). The BTS has the same setup as the RTS except that it does not have a data acquisition system. The walkie-talkie operating frequency is 477.1 MHz with FM transmission. A combination of One Time Pad (OTP) and Caesar Cipher cryptographic algorithms are implemented in order to safeguard the information from eavesdroppers. OTP was chosen because it is suitable for low bit rate data
ABSTRACT This paper presents the admission control mechanism which can minimise the overwhelming ... more ABSTRACT This paper presents the admission control mechanism which can minimise the overwhelming effect of limited radio resources as the demand for network service increases. The simulation study was conducted using NCTUns module with hierarchical Quality of Service (QoS) priority method. The result shows the proposed admission control mechanism is able to increase the number of subscriber being served and reduces the radio resources wastage by about 35%.
For the past few years, wireless networks have played bigger role in connecting people. Demand fo... more For the past few years, wireless networks have played bigger role in connecting people. Demand for it services has increased tremendously. In order to provide better services and choices for high-speed internet access and multimedia service for business and residential customer, IEEE has come out with new solution. Started on 2001, IEEE 802.16 working group was developing the IEEE 802.16 standards for wireless Metropolitan Area Networks. Their objective and forecast are to provide broadband wireless last-miles access in a Metropolitan Area Network, easy to deploy and giving high speed data rate and large covering area. To fulfil this objective, a good scheduling system can boost the performance of Wireless network. In this work, a detailed simulation study from the Base Station to Subscriber station (downlink) is carried out for comparing 2 different schedulers in terms of their performance. The simulation is carried out via the NCTUns simulator.
This paper presents the performance analysis of various relay stations in IEEE 802.16j Mobile Mul... more This paper presents the performance analysis of various relay stations in IEEE 802.16j Mobile Multi-hop Relay (MMR) WiMAX for half and full duplex communication. The main function of Relay Station (RS) is to enhance the network capacity and extends the coverage area. The efficiency of RS is evaluated based on the throughput for downlink and uplink transmission.
This paper presents an evaluation of whether the indoor signal strength for commercial buildings ... more This paper presents an evaluation of whether the indoor signal strength for commercial buildings fulfills the cell planning requirement. In order to provide high quality cellular service, it is necessary to place an array of distributed antennas connected using feeder cable within the building. With the feeder cable approach, splitters and computer software, we develop using Visual Basic 6.0. The effective radiated power (ERP) at the distributed antenna can be calculated and it can also be predicted how far the signal can go with the calculated ERP. This design process can be used to obtain an estimated indoor system requirement. All of the requirements can be achieved by applying the method in this paper.
Scheduler is one of the crucial mechanisms that influence the delivery of quality of services in ... more Scheduler is one of the crucial mechanisms that influence the delivery of quality of services in WiMAX (Worldwide Interoperability for Microwave Access) networks. With the rapid advances in telecommunication technologies, Mobile Multi-hop Relay (MMR) WiMAX is introduced to satisfy the ever increasing demand for higher speed and throughput. This paper discusses the scheduling technique specifically for the admission control of real-time Polling Service (rtPS). The simulation studies were conducted by adopting the weighted QoS method from the NCTUns module. The result shows the proposed admission control is capable to increase the number of subscriber being served and minimize the radio resources wastage. The capability of the admission control was also evaluated for various number of mobile stations deployed.
The attention on WiMAX and WiFi technologies are rapidly progressing and now it is common to find... more The attention on WiMAX and WiFi technologies are rapidly progressing and now it is common to find them not just in laptops and personal digital assistants (PDAs), but in equipment as mobile phones, parking meters, security cameras and home entertainment equipment. A combination of WiFi and WiMAX deployment, will offer more cost-effective solution than a sole WiMAX or WiFi implementation. Its technology is best meets the demand for personal broadband services. This project is focused on the performance evaluation of WiMAX and WiFi systems. It is conducted using open source simulator called NCTUns 6.0. Several scenarios have been created, to evaluate the coexistence of WiMAX and WiFi technology. The data of the simulation results have been gathered and the performance with the effects of transport layer protocol, send rates, packet sizes, distances, bandwidth and queue length were analyzed. Based on the results obtained, the performance of both WiMAX and WiFi technology are not affected due to distances variation but its performance can be improved by using of other parameter such as packet size, bandwidth and queue length.
Seamless handover between different access technologies is a great challenge as it needs to obey ... more Seamless handover between different access technologies is a great challenge as it needs to obey different performance of QoS and security constraints. Subscribers are becoming more demanding regarding roaming capabilities across different networking technologies such as WiFi, WiMAX, and CDMA as they claim service continuity with QoS requirement and good security features. In this paper, a QoS based vertical handover mechanism between WiMAX and WiFi networks is proposed by applying the Signal to Interference and Noise Ratio SINR. The Media Independent Handover MIH (IEEE 802.21) protocol is adopted to assist in the handover decisions by providing a suitable platform for vertical handovers. The performance of the proposed SINR based vertical handover algorithm and RSS based vertical handover algorithm have been evaluated in terms of the maximum downlink throughputs.
We propose the desirable features or criteria to be considered when designing routing protocols f... more We propose the desirable features or criteria to be considered when designing routing protocols for mobile ad hoc networks (MANET). From a literature review to compare currently implemented routing protocols, we have identified the important features that should be included in the routing protocol. Looking at the current implementations, each routing protocol has its own particular features or criteria of merit. The mobile ad hoc network is expected to contribute a greater mobility service that will become a high demand.
This paper examines multicast traffic in single-hop local WDM lightwave networks based on a broad... more This paper examines multicast traffic in single-hop local WDM lightwave networks based on a broadcast-and-select system. We use an approximate analytical solution and Markov model to show the effect of tuning time on system performance. We also show the trade-off between average packet delay against number of channels and network offered load. Finally, we show the trade-off between blocking probability and network offered load.
Many network administrators or providers are hesitant or not ready to offer the users the informa... more Many network administrators or providers are hesitant or not ready to offer the users the information of current bandwidth utilization on their Internet connection or other connection. There are many justifiable and unjustifiable reasons for this. We believe in opening up the communication between the users and ourselves and also believe in honestly and accurately portraying the services we are receiving via our communication lines. This paper presents a case study on the performance analysis for State Government Telecommunication Network (Terengganu*Net) bandwidth utilizations and protocol distributions.
... Receiver Performance Characteristics for Multicast Traffic in WDM Optical Network Rabi W.Haba... more ... Receiver Performance Characteristics for Multicast Traffic in WDM Optical Network Rabi W.Habash', Borhanuddin Mohd. Ali2, Mohd Dani Baba', and Mohammad Ibrahim' 'Faculty of Electrical Engineering, Universiti Tehologi Mara 40450 Shah Alam, Selangor, Malaysia ...
The objective of this paper is to discuss on the implementation of cryptographic security algorit... more The objective of this paper is to discuss on the implementation of cryptographic security algorithms for radio telemetry using the graphical programming software from National Instruments known as LabVIEW. The telemetry system consists of a remote telemetry station (RTS) and base telemetry station (BTS) for acquiring and monitoring environmental conditions respectively. RTS setup includes a desktop computer integrated with a data acquisition system, 1200 bps modem and GP300 Motorola walkie talkie (see Ghodgaonkar, D.K. et al., IEEE Proceedings Malaysia Section 2nd National Conference on Telecommunications Technology, p.88-93, 1998). The BTS has the same setup as the RTS except that it does not have a data acquisition system. The walkie-talkie operating frequency is 477.1 MHz with FM transmission. A combination of One Time Pad (OTP) and Caesar Cipher cryptographic algorithms are implemented in order to safeguard the information from eavesdroppers. OTP was chosen because it is suitable for low bit rate data
ABSTRACT This paper presents the admission control mechanism which can minimise the overwhelming ... more ABSTRACT This paper presents the admission control mechanism which can minimise the overwhelming effect of limited radio resources as the demand for network service increases. The simulation study was conducted using NCTUns module with hierarchical Quality of Service (QoS) priority method. The result shows the proposed admission control mechanism is able to increase the number of subscriber being served and reduces the radio resources wastage by about 35%.
For the past few years, wireless networks have played bigger role in connecting people. Demand fo... more For the past few years, wireless networks have played bigger role in connecting people. Demand for it services has increased tremendously. In order to provide better services and choices for high-speed internet access and multimedia service for business and residential customer, IEEE has come out with new solution. Started on 2001, IEEE 802.16 working group was developing the IEEE 802.16 standards for wireless Metropolitan Area Networks. Their objective and forecast are to provide broadband wireless last-miles access in a Metropolitan Area Network, easy to deploy and giving high speed data rate and large covering area. To fulfil this objective, a good scheduling system can boost the performance of Wireless network. In this work, a detailed simulation study from the Base Station to Subscriber station (downlink) is carried out for comparing 2 different schedulers in terms of their performance. The simulation is carried out via the NCTUns simulator.
This paper presents the performance analysis of various relay stations in IEEE 802.16j Mobile Mul... more This paper presents the performance analysis of various relay stations in IEEE 802.16j Mobile Multi-hop Relay (MMR) WiMAX for half and full duplex communication. The main function of Relay Station (RS) is to enhance the network capacity and extends the coverage area. The efficiency of RS is evaluated based on the throughput for downlink and uplink transmission.
This paper presents an evaluation of whether the indoor signal strength for commercial buildings ... more This paper presents an evaluation of whether the indoor signal strength for commercial buildings fulfills the cell planning requirement. In order to provide high quality cellular service, it is necessary to place an array of distributed antennas connected using feeder cable within the building. With the feeder cable approach, splitters and computer software, we develop using Visual Basic 6.0. The effective radiated power (ERP) at the distributed antenna can be calculated and it can also be predicted how far the signal can go with the calculated ERP. This design process can be used to obtain an estimated indoor system requirement. All of the requirements can be achieved by applying the method in this paper.
Scheduler is one of the crucial mechanisms that influence the delivery of quality of services in ... more Scheduler is one of the crucial mechanisms that influence the delivery of quality of services in WiMAX (Worldwide Interoperability for Microwave Access) networks. With the rapid advances in telecommunication technologies, Mobile Multi-hop Relay (MMR) WiMAX is introduced to satisfy the ever increasing demand for higher speed and throughput. This paper discusses the scheduling technique specifically for the admission control of real-time Polling Service (rtPS). The simulation studies were conducted by adopting the weighted QoS method from the NCTUns module. The result shows the proposed admission control is capable to increase the number of subscriber being served and minimize the radio resources wastage. The capability of the admission control was also evaluated for various number of mobile stations deployed.
The attention on WiMAX and WiFi technologies are rapidly progressing and now it is common to find... more The attention on WiMAX and WiFi technologies are rapidly progressing and now it is common to find them not just in laptops and personal digital assistants (PDAs), but in equipment as mobile phones, parking meters, security cameras and home entertainment equipment. A combination of WiFi and WiMAX deployment, will offer more cost-effective solution than a sole WiMAX or WiFi implementation. Its technology is best meets the demand for personal broadband services. This project is focused on the performance evaluation of WiMAX and WiFi systems. It is conducted using open source simulator called NCTUns 6.0. Several scenarios have been created, to evaluate the coexistence of WiMAX and WiFi technology. The data of the simulation results have been gathered and the performance with the effects of transport layer protocol, send rates, packet sizes, distances, bandwidth and queue length were analyzed. Based on the results obtained, the performance of both WiMAX and WiFi technology are not affected due to distances variation but its performance can be improved by using of other parameter such as packet size, bandwidth and queue length.
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