Azade Khalaj - Academia.edu (original) (raw)

Papers by Azade Khalaj

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2010

The increase in the popularity of small digital mobile devices also implies an increased demand i... more The increase in the popularity of small digital mobile devices also implies an increased demand in applications. The limited computing capabilities on the mobile devices and the unreliability of wireless links are barriers to the smooth access of mobile devices to the Grid applications and resources. In this paper a proxy-based approach is presented that is able to support various kinds of applications to be used by mobile devices by providing specific-purpose services on the proxy. The implemented prototype that includes some of the realized proxy services and the example client application for a mobile device show the viability of the proposed approach.

2005 Asia-Pacific Conference on Communications

IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately the access m... more IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately the access methods offered in this standard cannot support QoS (quality of service) for real-time traffics. One parameter which is important in providing QoS is jitter (variance in packet delays). Majority of the proposed mechanisms for enabling DCF (distributed coordination function) with QoS capabilities does

2005 13th IEEE International Conference on Networks Jointly held with the 2005 IEEE 7th Malaysia International Conf on Communic, 2005

The DCF (distributed coordination function) access method of IEEE 802.11 standard cannot support ... more The DCF (distributed coordination function) access method of IEEE 802.11 standard cannot support QoS (quality of service) for real-time traffics. Knowing that the use of multimedia applications over WLANs is increasing, it seems essential to overcome this problem. There are many methods to enable DCF with service differentiation and QoS. The difficulty in majority of these methods is unfair bandwidth

2005 13th IEEE International Conference on Networks Jointly held with the 2005 IEEE 7th Malaysia International Conf on Communic, 2005

IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately the access m... more IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately the access methods offered in this standard cannot support QoS (quality of service) for real-time traffics. It seems that the access methods employed in this standard, causes high variations in delay or jitter and also waste of bandwidth due to collisions. In this paper, we

2012 Third FTRA International Conference on Mobile, Ubiquitous, and Intelligent Computing, 2012

2013 International Conference on MOBILe Wireless MiddleWARE, Operating Systems, and Applications, 2013

ABSTRACT Research activities in the mobile computing field aim to find solutions for achieving th... more ABSTRACT Research activities in the mobile computing field aim to find solutions for achieving the smoother access to remote online resources, such as cloud services, from client application found on mobile devices. The limited capabilities of mobile devices and also the unreliable condition of wireless environment are sources of challenges in achieving the mentioned goal. We have proposed a proxy-based mobile computing system that offloads compute-intensive tasks from mobile devices to proxies. Additionally, to handle the variation in connection quality, the proxies are chosen and changed dynamically to provide a better service quality for the client application. The result of our experiments shows the effectiveness of our approach in choosing the appropriate proxy and switching to a new proxy when it is needed.

Wireless Personal Communications, 2007

IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately, the access ... more IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately, the access methods offered in this standard cannot support QoS (Quality of Service) for real-time traffics. Using multimedia applications over WLANs is increasing and, on the other hand, it seems that the access methods employed in this standard causes high variations in delay or jitter and wastes bandwidth due to collisions. There are many methods to enable DCFbasic access method in 802.11-with service differentiation and QoS. The difficulty in majority of these methods is unfair bandwidth allocation among low and high priority traffics at high loads resulting starvation for low priority traffics. In this paper, we modify the way that the CW (Contention Window) size is calculated after a successful transmission and study the effect of the CW size on performance and fairness. Results of our simulations show that the performance of DCF with this modification is better, specially, for traffics in which throughput is the most important parameter.

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2010

ABSTRACT The increase in the popularity of small digital mobile devices also implies an increased... more ABSTRACT The increase in the popularity of small digital mobile devices also implies an increased demand in applications. The limited computing capabilities on the mobile devices and the unreliability of wireless links are barriers to the smooth access of mobile devices to the Grid applications and resources. In this paper a proxy-based approach is presented that is able to support various kinds of applications to be used by mobile devices by providing specific-purpose services on the proxy. The implemented prototype that includes some of the realized proxy services and the example client application for a mobile device show the viability of the proposed approach. © Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2010.

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2010

The increase in the popularity of small digital mobile devices also implies an increased demand i... more The increase in the popularity of small digital mobile devices also implies an increased demand in applications. The limited computing capabilities on the mobile devices and the unreliability of wireless links are barriers to the smooth access of mobile devices to the Grid applications and resources. In this paper a proxy-based approach is presented that is able to support various kinds of applications to be used by mobile devices by providing specific-purpose services on the proxy. The implemented prototype that includes some of the realized proxy services and the example client application for a mobile device show the viability of the proposed approach.

2005 Asia-Pacific Conference on Communications

IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately the access m... more IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately the access methods offered in this standard cannot support QoS (quality of service) for real-time traffics. One parameter which is important in providing QoS is jitter (variance in packet delays). Majority of the proposed mechanisms for enabling DCF (distributed coordination function) with QoS capabilities does

2005 13th IEEE International Conference on Networks Jointly held with the 2005 IEEE 7th Malaysia International Conf on Communic, 2005

The DCF (distributed coordination function) access method of IEEE 802.11 standard cannot support ... more The DCF (distributed coordination function) access method of IEEE 802.11 standard cannot support QoS (quality of service) for real-time traffics. Knowing that the use of multimedia applications over WLANs is increasing, it seems essential to overcome this problem. There are many methods to enable DCF with service differentiation and QoS. The difficulty in majority of these methods is unfair bandwidth

2005 13th IEEE International Conference on Networks Jointly held with the 2005 IEEE 7th Malaysia International Conf on Communic, 2005

IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately the access m... more IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately the access methods offered in this standard cannot support QoS (quality of service) for real-time traffics. It seems that the access methods employed in this standard, causes high variations in delay or jitter and also waste of bandwidth due to collisions. In this paper, we

2012 Third FTRA International Conference on Mobile, Ubiquitous, and Intelligent Computing, 2012

2013 International Conference on MOBILe Wireless MiddleWARE, Operating Systems, and Applications, 2013

ABSTRACT Research activities in the mobile computing field aim to find solutions for achieving th... more ABSTRACT Research activities in the mobile computing field aim to find solutions for achieving the smoother access to remote online resources, such as cloud services, from client application found on mobile devices. The limited capabilities of mobile devices and also the unreliable condition of wireless environment are sources of challenges in achieving the mentioned goal. We have proposed a proxy-based mobile computing system that offloads compute-intensive tasks from mobile devices to proxies. Additionally, to handle the variation in connection quality, the proxies are chosen and changed dynamically to provide a better service quality for the client application. The result of our experiments shows the effectiveness of our approach in choosing the appropriate proxy and switching to a new proxy when it is needed.

Wireless Personal Communications, 2007

IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately, the access ... more IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately, the access methods offered in this standard cannot support QoS (Quality of Service) for real-time traffics. Using multimedia applications over WLANs is increasing and, on the other hand, it seems that the access methods employed in this standard causes high variations in delay or jitter and wastes bandwidth due to collisions. There are many methods to enable DCFbasic access method in 802.11-with service differentiation and QoS. The difficulty in majority of these methods is unfair bandwidth allocation among low and high priority traffics at high loads resulting starvation for low priority traffics. In this paper, we modify the way that the CW (Contention Window) size is calculated after a successful transmission and study the effect of the CW size on performance and fairness. Results of our simulations show that the performance of DCF with this modification is better, specially, for traffics in which throughput is the most important parameter.

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2010

ABSTRACT The increase in the popularity of small digital mobile devices also implies an increased... more ABSTRACT The increase in the popularity of small digital mobile devices also implies an increased demand in applications. The limited computing capabilities on the mobile devices and the unreliability of wireless links are barriers to the smooth access of mobile devices to the Grid applications and resources. In this paper a proxy-based approach is presented that is able to support various kinds of applications to be used by mobile devices by providing specific-purpose services on the proxy. The implemented prototype that includes some of the realized proxy services and the example client application for a mobile device show the viability of the proposed approach. © Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2010.