In wireless networks, users freely change their service points while they are connected. Mobility... more In wireless networks, users freely change their service points while they are connected. Mobility management in this environment is an essential technology for keeping track of the users' current location and for delivering data correctly. Then, the challenge is the design of an efficient IP-based mobility management scheme. Mobility management with provision of seamless handover is a key topic in Next-Generation Wireless Networks. Then, it is crucial to provide seamless mobility and service continuity in intelligent and efficient ways. This paper presents an analytical framework of fast handover for hierarchical MIPv6. In this paper, the impact of several wireless system factors, such as user velocity, user density, mobility domain size, and sessionto-mobility ratio are investigated on the network performance and the costs. Keywords– Handover, Hierarchical MIPv6 (HMIPv6), Next-Generation Wireless Networks (NGWN), Session-toMobility ratio (SMR).
Due to the necessity of high availability for Cloud Systems, most organizations need cloud servic... more Due to the necessity of high availability for Cloud Systems, most organizations need cloud services which minimize system down-time. Virtual Machine (VM) Migration is a simple solution for what is called a Hot-Spot or highly utilized PM. Live Migrating VMs allows migration of VMs while they are running their applications with no shutdown or down-time. Therefore, it provides Hot-Spot relieve, helps in Business Continuity, and provides a high available system. In this paper, an adaptive migration scheme (AMS) is proposed in order to preserve the system’s load balance state. It considers migrating VMs in groups, where each group includes a number of VMs increases from two to a maximum concurrent limit. AMS provides a way to find a maximum concurrent limit for the number of migrated VMs to be used to enhance the migration process. AMS is applied on a real case study. Two metrics are used to evaluate the improvements in migrations; concurrent time reduction and transfer rate improvement....
WiMAX is considered as a broadband wireless technology that is capable of delivering voice, data ... more WiMAX is considered as a broadband wireless technology that is capable of delivering voice, data and video services. Since that these services should be available during the movement of Mobile Subscriber (MS), mobility is an important issue in WiMAX networks. Therefore, dealing with the random motion of MS in handoff operation is a great challenge. This paper focuses on the balance between having updated information about the current location and the overhead incurred due to the scanning activity in random mobility model. In this paper, a Smart Location Update Mechanism (SLUM) is proposed to deal with a random motion of MS in handoff operation. The proposed scheme takes the decision about when to begin the scanning activity. In addition, it reduces the number of Base Stations (BSs) to be scanned by selecting only two BSs according to some criteria. The numerical results show that SLUM reduces the scanning delay, the scanning cost, and total handoff latency.
This paper proposed a new scheme for smooth handoff over F-HMIPv6 networks based on Location Base... more This paper proposed a new scheme for smooth handoff over F-HMIPv6 networks based on Location Based Services (LBS). It uses the available information about mobile node (MN) such as user mobility patterns and MN’s velocity to reduce handoff latency. In the proposed scheme, the movement pattern of users plays an important role in the performance analysis. The proposed scheme develops LBS that records a number of mobility patterns based on user daily behavior, and exploits these information to reduce the handoff latency. The proposed scheme is analyzed and compared with F-HMIPv6 protocol. The results show that it improves the performance in terms of handoff latency, packet delivery cost, and location update cost. Specifically, the proposed scheme achieves the tradeoff between realizing a smooth handoff and minimizing the cost that is the demand for all customers of mobile services.
Femtocell plays a significant role in technologies to improve service quality and data rates for ... more Femtocell plays a significant role in technologies to improve service quality and data rates for indoor mobile users. It is the recent less expensive concept that provides better indoor coverage. Therefore, handoff process from macrocell to femtocell is an open research issue. In this paper, an adaptive macro/femto handoff scheme is proposed. It takes into consideration the velocity of mobile station, load balancing and the accessing mode of the target cell. It effectively handles the indoor handoff situations by checking user velocity which has to be lower than a threshold value in order to guarantee that this user has a sufficient time to switch from macrocell to femtocell. The proposed scheme aims to achieve load balancing between macrocells and femtocells. It also minimizes the number of femtocells in the neighbor cell list. The target femtocell is predicted based on the direction of the mobile user considering the femtocells accessing mode. Numerical results show that the propo...
Cloud Computing has the facility to transform a large part of information technology into service... more Cloud Computing has the facility to transform a large part of information technology into services in which computer resources are virtualized and made available as a utility service. From here comes the importance of scheduling virtual resources to get the maximum utilization of physical resources. This paper presents two cooperative algorithms: a Smart Elastic Scheduling Algorithm (SESA) and an Adaptive Worst Fit Decreasing Virtual Machine Placement (AWFDVP) algorithm. The proposed algorithms work to dynamically distribute the cloud system’s physical resources to obtain a load-balanced consolidated system with minimal used power, memory, and processing time. SESA arranges VMs in clusters based on their memory and CPU parameters’ value. Then it deals with the colocated VMs that share some of their memory pages and located on the same physical machine, as a group. Then the migration decision is made based on the evaluation for the entire system by AWFDVP. This process minimizes the number of migrations among the system, saves the consumed power, and prevents performance degradation for the VM while preserving the load-balance state of the entire system. SESA reduces the power consumption in the cloud system by 28.1%, the number of migrations by 57.77%, and performance degradation by 57.1%.
In wireless networks, users freely change their service points while they are connected. Mobility... more In wireless networks, users freely change their service points while they are connected. Mobility management in this environment is an essential technology for keeping track of the users' current location and for delivering data correctly. Then, the challenge is the design of an efficient IP-based mobility management scheme. Mobility management with provision of seamless handover is a key topic in Next-Generation Wireless Networks. Then, it is crucial to provide seamless mobility and service continuity in intelligent and efficient ways. This paper presents an analytical framework of fast handover for hierarchical MIPv6. In this paper, the impact of several wireless system factors, such as user velocity, user density, mobility domain size, and sessionto-mobility ratio are investigated on the network performance and the costs. Keywords– Handover, Hierarchical MIPv6 (HMIPv6), Next-Generation Wireless Networks (NGWN), Session-toMobility ratio (SMR).
Due to the necessity of high availability for Cloud Systems, most organizations need cloud servic... more Due to the necessity of high availability for Cloud Systems, most organizations need cloud services which minimize system down-time. Virtual Machine (VM) Migration is a simple solution for what is called a Hot-Spot or highly utilized PM. Live Migrating VMs allows migration of VMs while they are running their applications with no shutdown or down-time. Therefore, it provides Hot-Spot relieve, helps in Business Continuity, and provides a high available system. In this paper, an adaptive migration scheme (AMS) is proposed in order to preserve the system’s load balance state. It considers migrating VMs in groups, where each group includes a number of VMs increases from two to a maximum concurrent limit. AMS provides a way to find a maximum concurrent limit for the number of migrated VMs to be used to enhance the migration process. AMS is applied on a real case study. Two metrics are used to evaluate the improvements in migrations; concurrent time reduction and transfer rate improvement....
WiMAX is considered as a broadband wireless technology that is capable of delivering voice, data ... more WiMAX is considered as a broadband wireless technology that is capable of delivering voice, data and video services. Since that these services should be available during the movement of Mobile Subscriber (MS), mobility is an important issue in WiMAX networks. Therefore, dealing with the random motion of MS in handoff operation is a great challenge. This paper focuses on the balance between having updated information about the current location and the overhead incurred due to the scanning activity in random mobility model. In this paper, a Smart Location Update Mechanism (SLUM) is proposed to deal with a random motion of MS in handoff operation. The proposed scheme takes the decision about when to begin the scanning activity. In addition, it reduces the number of Base Stations (BSs) to be scanned by selecting only two BSs according to some criteria. The numerical results show that SLUM reduces the scanning delay, the scanning cost, and total handoff latency.
This paper proposed a new scheme for smooth handoff over F-HMIPv6 networks based on Location Base... more This paper proposed a new scheme for smooth handoff over F-HMIPv6 networks based on Location Based Services (LBS). It uses the available information about mobile node (MN) such as user mobility patterns and MN’s velocity to reduce handoff latency. In the proposed scheme, the movement pattern of users plays an important role in the performance analysis. The proposed scheme develops LBS that records a number of mobility patterns based on user daily behavior, and exploits these information to reduce the handoff latency. The proposed scheme is analyzed and compared with F-HMIPv6 protocol. The results show that it improves the performance in terms of handoff latency, packet delivery cost, and location update cost. Specifically, the proposed scheme achieves the tradeoff between realizing a smooth handoff and minimizing the cost that is the demand for all customers of mobile services.
Femtocell plays a significant role in technologies to improve service quality and data rates for ... more Femtocell plays a significant role in technologies to improve service quality and data rates for indoor mobile users. It is the recent less expensive concept that provides better indoor coverage. Therefore, handoff process from macrocell to femtocell is an open research issue. In this paper, an adaptive macro/femto handoff scheme is proposed. It takes into consideration the velocity of mobile station, load balancing and the accessing mode of the target cell. It effectively handles the indoor handoff situations by checking user velocity which has to be lower than a threshold value in order to guarantee that this user has a sufficient time to switch from macrocell to femtocell. The proposed scheme aims to achieve load balancing between macrocells and femtocells. It also minimizes the number of femtocells in the neighbor cell list. The target femtocell is predicted based on the direction of the mobile user considering the femtocells accessing mode. Numerical results show that the propo...
Cloud Computing has the facility to transform a large part of information technology into service... more Cloud Computing has the facility to transform a large part of information technology into services in which computer resources are virtualized and made available as a utility service. From here comes the importance of scheduling virtual resources to get the maximum utilization of physical resources. This paper presents two cooperative algorithms: a Smart Elastic Scheduling Algorithm (SESA) and an Adaptive Worst Fit Decreasing Virtual Machine Placement (AWFDVP) algorithm. The proposed algorithms work to dynamically distribute the cloud system’s physical resources to obtain a load-balanced consolidated system with minimal used power, memory, and processing time. SESA arranges VMs in clusters based on their memory and CPU parameters’ value. Then it deals with the colocated VMs that share some of their memory pages and located on the same physical machine, as a group. Then the migration decision is made based on the evaluation for the entire system by AWFDVP. This process minimizes the number of migrations among the system, saves the consumed power, and prevents performance degradation for the VM while preserving the load-balance state of the entire system. SESA reduces the power consumption in the cloud system by 28.1%, the number of migrations by 57.77%, and performance degradation by 57.1%.
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