Abstract The Malaysian government, through many initiatives, has seriously looked into reducing a... more Abstract The Malaysian government, through many initiatives, has seriously looked into reducing and if possible eliminating, the digital divide that exists between the developed urban and the technologically impoverished rural communities. The e-Bario Project, a successful research showcase of Universiti Malaysia Sarawak, is one of the leading examples in Malaysia of such an attempt to bridge the digital gap and to achieve sustainable human development through the introduction of information and communication ...
The Malaysian government inspires the country to become a fully developed nation with an emphasis... more The Malaysian government inspires the country to become a fully developed nation with an emphasis on knowledge-based economy by the year 2020. Though the government has been pushing aggressively for one household to own one computer and at least an Internet connection, it is difficult to see these desires and plans of the Malaysian government going beyond the borders of urban centres and small towns due to the limited infrastructure and amenities. In Sarawak, it has been noted that there are limited mechanisms to ensure that ...
2008 International Conference on Advanced Technologies for Communications, 2008
In this paper, we design an admis.~ion control scheme for adhoc WLAN based on self-restraint mech... more In this paper, we design an admis.~ion control scheme for adhoc WLAN based on self-restraint mechanism. The self-restraint admission control mechanism is implemented in each of the wireless nodes instead of the access point (AP). It has two important admission control abilities: first, it can restrain itself from joining the network if the network channel is congested; second, a joining node can drop it~lf from the network if the channel becomes congested as a result of its admission. We simulate an adhoc WLAN and show that the self-restraining mechanism works effectively in sustaining traffic in adhoc WLAN and also protects real-time traffic.
2007 15th IEEE International Conference on Networks, 2007
Wireless local area networks (WLANs) have become very popular both in private and public sectors.... more Wireless local area networks (WLANs) have become very popular both in private and public sectors. Despite the fast expansion of WLANs in various environments, quality of service (QoS) issues for multimedia applications in WLANs are not yet resolved. Multimedia applications contain traffic that are sensitive to delay and jitter and therefore a best-effort protocol such as the legacy IEEE 802.11 is not suitable. The 802.11e protocol provides prioritization and classification of traffic to offer better QoS for real-time services. However, it leaves the design and implementation of many important optimization features to vendors. In this paper we introduce a mechanism to improve the delay and jitter of real-time traffic in WLAN nodes supporting multimedia applications. In our proposed mechanism, we segregate voice and video traffic from the best-effort traffic. We create a scheduler that schedules the access of real-time traffic and non real-time traffic to the medium with centralized polling and distributed contention respectively. We show that our proposed protocol performs better in terms of delay and jitter than the legacy 802.11 and 802.11e in a scenario where all wireless nodes carry multimedia traffic simultaneously.
2009 International Conference on Ultra Modern Telecommunications & Workshops, 2009
This paper provides an in-depth study of wireless sensor network (WSN) application to monitor and... more This paper provides an in-depth study of wireless sensor network (WSN) application to monitor and control the swift habitat. A set of system is designed and developed which includes the node's hardware, GUI software, sensor network, and interconnectivity for remote data access and management. System architecture is proposed to address the requirements for habitat monitoring. The application driven designed, provides
Abstract The Malaysian government, through many initiatives, has seriously looked into reducing a... more Abstract The Malaysian government, through many initiatives, has seriously looked into reducing and if possible eliminating, the digital divide that exists between the developed urban and the technologically impoverished rural communities. The e-Bario Project, a successful research showcase of Universiti Malaysia Sarawak, is one of the leading examples in Malaysia of such an attempt to bridge the digital gap and to achieve sustainable human development through the introduction of information and communication ...
The Malaysian government inspires the country to become a fully developed nation with an emphasis... more The Malaysian government inspires the country to become a fully developed nation with an emphasis on knowledge-based economy by the year 2020. Though the government has been pushing aggressively for one household to own one computer and at least an Internet connection, it is difficult to see these desires and plans of the Malaysian government going beyond the borders of urban centres and small towns due to the limited infrastructure and amenities. In Sarawak, it has been noted that there are limited mechanisms to ensure that ...
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08), 2008
Providing Quality of Service (QoS) for converging traffic in wireless local area network (WLAN) i... more Providing Quality of Service (QoS) for converging traffic in wireless local area network (WLAN) is still a major issue for the researchers and industries. Due to the limited bandwidth and exposure to unpredictable interferences in a wireless environment, efficient management and optimization of the access protocols are essential to provide acceptable QoS for real-time traffic and fairness to best-effort traffic. In this paper, we investigate the throughput and delay performance of the legacy IEEE 802.11 and the 802.11e when carrying converging data in WLAN. We evaluate our recently proposed protocol known as wireless token network protocol (WTN) and show that WTN successfully increases performance of converging traffic in WLAN by, first, decreasing the size of the frames and subframes of the MAC header, and second, by implementing centralized polling to reduce collisions of packets.
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08), 2008
In this paper we propose an optimized WLAN MAC protocol for multimedia applications. The proposed... more In this paper we propose an optimized WLAN MAC protocol for multimedia applications. The proposed MAC protocol consist of 3 main optimizing architectures, traffic segregation, specific service interval (SI) for voice and video traffic and smaller contention window (CW). Traffic segregation segregates real-time traffic from best-effort traffic while specific service interval provides voice and video traffic with the SI based on its mean arrival rate. In the contention time frame, the CW is made smaller to reduce delay and increase throughput. Ns2 is used as a simulating tool to compare the results of our proposed protocol with the legacy 802.11 and the 802.11e protocols. We show that our protocol has significantly better throughput than the legacy 802.11 and the 802.11e. Fluctuations in the throughput is also shown to be lower in our proposed protocol. The technique implemented also provides easier and better management of realtime traffic to support guaranteed quality of service (QoS).
2007 IFIP International Conference on Wireless and Optical Communications Networks, 2007
Abstract-Providing quality of service (QoS) for multimedia applications in wireless local area ne... more Abstract-Providing quality of service (QoS) for multimedia applications in wireless local area networks (WLAN) is a very challenging task. This is mainly due to the real-time nature of multimedia traffic such as voice and video applications, that are sensitive to delay and jitter. QoS ...
2008 Australasian Telecommunication Networks and Applications Conference, 2008
Admission control is an important mechanism for sustaining throughput and supporting quality of s... more Admission control is an important mechanism for sustaining throughput and supporting quality of service (QoS) for real-time traffic in a wireless local area network (WLAN).
Voice over IP (VoIP) and voice-video over IP (VIoIP) are becoming very popular and widespread. Th... more Voice over IP (VoIP) and voice-video over IP (VIoIP) are becoming very popular and widespread. These types of real-time services produce streams that are almost symmetrical in nature. A new token passing media access control (MAC) developed by our group, called wireless token network (WTN), has been designed with QoS guarantees in mind. We have previously shown in our previous
Vertical handover decision (VHD) algorithms are essential components of the architecture of the f... more Vertical handover decision (VHD) algorithms are essential components of the architecture of the forthcoming Fourth Generation (4G) heterogeneous wireless networks. These algorithms need to be designed to provide the required Quality of Service (QoS) to a wide range of applications while allowing seamless roaming among a multitude of access network technologies. In this paper, we present a comprehensive survey of the VHD algorithms designed to satisfy these requirements. To offer a systematic comparison, we categorize the algorithms into four groups based on the main handover decision criterion used. Also, to evaluate tradeoffs between their complexity of implementation and efficiency, we discuss three representative VHD algorithms in each group. j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / c o m n e t of two VHD algorithms. A subsequent survey's focus [41]
Abstract: The e-Bario project, a project on community informatics for rural community liberalisat... more Abstract: The e-Bario project, a project on community informatics for rural community liberalisation and development, has been cited and referenced as a model for projects in many countries. A second similar project, e-Bedian, was initiated and implemented in Sarawak, Malaysia, based on the e-Bario Model. However, the e-Bedian project took less than 5 months to be initiated and implemented, compared to the e-Bario project. This paper will examine how the e-Bedian project was initiated and implemented in such a short ...
Abstract The Malaysian government, through many initiatives, has seriously looked into reducing a... more Abstract The Malaysian government, through many initiatives, has seriously looked into reducing and if possible eliminating, the digital divide that exists between the developed urban and the technologically impoverished rural communities. The e-Bario Project, a successful research showcase of Universiti Malaysia Sarawak, is one of the leading examples in Malaysia of such an attempt to bridge the digital gap and to achieve sustainable human development through the introduction of information and communication ...
The Malaysian government inspires the country to become a fully developed nation with an emphasis... more The Malaysian government inspires the country to become a fully developed nation with an emphasis on knowledge-based economy by the year 2020. Though the government has been pushing aggressively for one household to own one computer and at least an Internet connection, it is difficult to see these desires and plans of the Malaysian government going beyond the borders of urban centres and small towns due to the limited infrastructure and amenities. In Sarawak, it has been noted that there are limited mechanisms to ensure that ...
2008 International Conference on Advanced Technologies for Communications, 2008
In this paper, we design an admis.~ion control scheme for adhoc WLAN based on self-restraint mech... more In this paper, we design an admis.~ion control scheme for adhoc WLAN based on self-restraint mechanism. The self-restraint admission control mechanism is implemented in each of the wireless nodes instead of the access point (AP). It has two important admission control abilities: first, it can restrain itself from joining the network if the network channel is congested; second, a joining node can drop it~lf from the network if the channel becomes congested as a result of its admission. We simulate an adhoc WLAN and show that the self-restraining mechanism works effectively in sustaining traffic in adhoc WLAN and also protects real-time traffic.
2007 15th IEEE International Conference on Networks, 2007
Wireless local area networks (WLANs) have become very popular both in private and public sectors.... more Wireless local area networks (WLANs) have become very popular both in private and public sectors. Despite the fast expansion of WLANs in various environments, quality of service (QoS) issues for multimedia applications in WLANs are not yet resolved. Multimedia applications contain traffic that are sensitive to delay and jitter and therefore a best-effort protocol such as the legacy IEEE 802.11 is not suitable. The 802.11e protocol provides prioritization and classification of traffic to offer better QoS for real-time services. However, it leaves the design and implementation of many important optimization features to vendors. In this paper we introduce a mechanism to improve the delay and jitter of real-time traffic in WLAN nodes supporting multimedia applications. In our proposed mechanism, we segregate voice and video traffic from the best-effort traffic. We create a scheduler that schedules the access of real-time traffic and non real-time traffic to the medium with centralized polling and distributed contention respectively. We show that our proposed protocol performs better in terms of delay and jitter than the legacy 802.11 and 802.11e in a scenario where all wireless nodes carry multimedia traffic simultaneously.
2009 International Conference on Ultra Modern Telecommunications & Workshops, 2009
This paper provides an in-depth study of wireless sensor network (WSN) application to monitor and... more This paper provides an in-depth study of wireless sensor network (WSN) application to monitor and control the swift habitat. A set of system is designed and developed which includes the node's hardware, GUI software, sensor network, and interconnectivity for remote data access and management. System architecture is proposed to address the requirements for habitat monitoring. The application driven designed, provides
Abstract The Malaysian government, through many initiatives, has seriously looked into reducing a... more Abstract The Malaysian government, through many initiatives, has seriously looked into reducing and if possible eliminating, the digital divide that exists between the developed urban and the technologically impoverished rural communities. The e-Bario Project, a successful research showcase of Universiti Malaysia Sarawak, is one of the leading examples in Malaysia of such an attempt to bridge the digital gap and to achieve sustainable human development through the introduction of information and communication ...
The Malaysian government inspires the country to become a fully developed nation with an emphasis... more The Malaysian government inspires the country to become a fully developed nation with an emphasis on knowledge-based economy by the year 2020. Though the government has been pushing aggressively for one household to own one computer and at least an Internet connection, it is difficult to see these desires and plans of the Malaysian government going beyond the borders of urban centres and small towns due to the limited infrastructure and amenities. In Sarawak, it has been noted that there are limited mechanisms to ensure that ...
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08), 2008
Providing Quality of Service (QoS) for converging traffic in wireless local area network (WLAN) i... more Providing Quality of Service (QoS) for converging traffic in wireless local area network (WLAN) is still a major issue for the researchers and industries. Due to the limited bandwidth and exposure to unpredictable interferences in a wireless environment, efficient management and optimization of the access protocols are essential to provide acceptable QoS for real-time traffic and fairness to best-effort traffic. In this paper, we investigate the throughput and delay performance of the legacy IEEE 802.11 and the 802.11e when carrying converging data in WLAN. We evaluate our recently proposed protocol known as wireless token network protocol (WTN) and show that WTN successfully increases performance of converging traffic in WLAN by, first, decreasing the size of the frames and subframes of the MAC header, and second, by implementing centralized polling to reduce collisions of packets.
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08), 2008
In this paper we propose an optimized WLAN MAC protocol for multimedia applications. The proposed... more In this paper we propose an optimized WLAN MAC protocol for multimedia applications. The proposed MAC protocol consist of 3 main optimizing architectures, traffic segregation, specific service interval (SI) for voice and video traffic and smaller contention window (CW). Traffic segregation segregates real-time traffic from best-effort traffic while specific service interval provides voice and video traffic with the SI based on its mean arrival rate. In the contention time frame, the CW is made smaller to reduce delay and increase throughput. Ns2 is used as a simulating tool to compare the results of our proposed protocol with the legacy 802.11 and the 802.11e protocols. We show that our protocol has significantly better throughput than the legacy 802.11 and the 802.11e. Fluctuations in the throughput is also shown to be lower in our proposed protocol. The technique implemented also provides easier and better management of realtime traffic to support guaranteed quality of service (QoS).
2007 IFIP International Conference on Wireless and Optical Communications Networks, 2007
Abstract-Providing quality of service (QoS) for multimedia applications in wireless local area ne... more Abstract-Providing quality of service (QoS) for multimedia applications in wireless local area networks (WLAN) is a very challenging task. This is mainly due to the real-time nature of multimedia traffic such as voice and video applications, that are sensitive to delay and jitter. QoS ...
2008 Australasian Telecommunication Networks and Applications Conference, 2008
Admission control is an important mechanism for sustaining throughput and supporting quality of s... more Admission control is an important mechanism for sustaining throughput and supporting quality of service (QoS) for real-time traffic in a wireless local area network (WLAN).
Voice over IP (VoIP) and voice-video over IP (VIoIP) are becoming very popular and widespread. Th... more Voice over IP (VoIP) and voice-video over IP (VIoIP) are becoming very popular and widespread. These types of real-time services produce streams that are almost symmetrical in nature. A new token passing media access control (MAC) developed by our group, called wireless token network (WTN), has been designed with QoS guarantees in mind. We have previously shown in our previous
Vertical handover decision (VHD) algorithms are essential components of the architecture of the f... more Vertical handover decision (VHD) algorithms are essential components of the architecture of the forthcoming Fourth Generation (4G) heterogeneous wireless networks. These algorithms need to be designed to provide the required Quality of Service (QoS) to a wide range of applications while allowing seamless roaming among a multitude of access network technologies. In this paper, we present a comprehensive survey of the VHD algorithms designed to satisfy these requirements. To offer a systematic comparison, we categorize the algorithms into four groups based on the main handover decision criterion used. Also, to evaluate tradeoffs between their complexity of implementation and efficiency, we discuss three representative VHD algorithms in each group. j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / c o m n e t of two VHD algorithms. A subsequent survey's focus [41]
Abstract: The e-Bario project, a project on community informatics for rural community liberalisat... more Abstract: The e-Bario project, a project on community informatics for rural community liberalisation and development, has been cited and referenced as a model for projects in many countries. A second similar project, e-Bedian, was initiated and implemented in Sarawak, Malaysia, based on the e-Bario Model. However, the e-Bedian project took less than 5 months to be initiated and implemented, compared to the e-Bario project. This paper will examine how the e-Bedian project was initiated and implemented in such a short ...
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