Multiservice Vertical Handoff Decision Algorithms

Zhu, Fang; McNair, Janise

doi:10.1155/wcn/2006/25861

Cited by 84 publications

(53 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Guo et al [24] present an adaptive multicriteria vertical handoff decision algorithm. Furthermore, a policy based handoff is proposed, considering many factors such as monetary cost, offered services, network conditions and user preferences [25]. Liu et al [26] propose a general handoff decision algorithm with consideration of both horizontal and vertical handoff in heterogeneous wireless networks.…”

Section: The Computer Journal 2009mentioning

confidence: 99%

Enhanced IMS Handoff Mechanism for QoS Support over Heterogeneous Network

Liao¹,

Qi²,

Zhu³

et al. 2009

The Computer Journal

View full text Add to dashboard Cite

IP multimedia subsystem (IMS) is over IP network architecture, but mobile IP cannot directly support session mobility controlled by session initiation protocol-based signaling. The long signaling delay for session reestablishment in application layer always results in session interruptions during the handoff. Therefore, handoff poses a challenge for quality of service (QoS) maintenance in IMS that targets to offer real-time multimedia applications over wireless mobile networks. The existing approaches to solve this problem depend on the advance resource reservation and the optimization of handoff control. Unfortunately, big cost of the advance resource reservation in neighboring domains is a major problem that leads to a serious signaling load and a waste of wireless bandwidth. To solve this issue, we present an enhanced IMS handoff mechanism (EHM) based on user mobility prediction to save network resources by avoiding multiple useless advance reservations. In addition, to support the heterogeneous access networks in IMS domain, EHM evolves a network selective scheme to utilize the network resources more efficiently. The architecture of EHM and the advance QoS negotiation signaling are also presented. We model the cost, the handoff delay and the session blocking probability for EHM and the previous work. Analytical and simulation results show that EHM can enhance the handoff performance, such as reducing resource reservation cost greatly, decreasing session reestablishment delay and making good use of multiple access network resources.

show abstract

Section: The Computer Journal 2009mentioning

confidence: 99%

Enhanced IMS Handoff Mechanism for QoS Support over Heterogeneous Network

Liao¹,

Qi²,

Zhu³

et al. 2009

The Computer Journal

View full text Add to dashboard Cite

show abstract

“…In the field of vertical handoff performance evaluation, few works were reported on handoff decision metrics such as average power consumption and average user preference dissatisfaction. But these metrics are specific to a vertical handoff decision algorithm [7,8] . A work was also reported on performance evaluation of vertical handoff system with four different decision algorithm with respect to bandwidth allocation and average delay of each flow of individual algorithm with an ideal wireless environment [9] .…”

Section: Introductionmentioning

confidence: 99%

Analytic Performability Model of Vertical Handoff in Wireless Networks

Gowrishankar¹,

Sekhar²,

Satyanarayana³

2009

J. of Computer Science

View full text Add to dashboard Cite

Problem statement:The next generation wireless systems should be designed to support heterogeneous traffic with seamless mobility. A single network alone cannot cope up with such heterogeneous requirements. Hence it is desirable to interoperate between diverse and complementary Radio Access Technologies (RATs). In such system, user will switch between different Radio Access Technologies (RATs) to satisfy the User/application requirement and this process is known as Vertical Handoff (VHO). The process of network switching had three phases, network discovery, handoff decision and execution. The decision phase played a crucial role in resource utilization and user/application Quality of Service (QoS) requirement. Hence it was essential to model and evaluate the handoff decision system along with VHO system model. Approach: The traditional performance models were optimistic models and would evaluate the system performance under ideal condition by ignoring failures and recovery in the system. The availability models were conservative models and would assess the availability/reliability of the system. The performabality models were combined models of performance and reliability. The performablity models were more realistic models of the system due to the simultaneous consideration of performance and reliability. Here the VHO process of a next generation wireless system was modeled and evaluated by an analytic performablity model and performance of decision system is evaluated through the sensitivity analysis of VHO decision parameter. Results: In VHO performance evaluation, the metrics of performance evaluation are handoff dropping probability and new call blocking probability. The dynamics of these metrics are depends on set of wireless network parameter such as Available Bandwidth (ABW), users, Bit Error Rate (BER) and network traffic. The ABW, BER and network traffic is also parameter for VHO decisions. The results of performance evaluation are used to develop a novel intelligent vertical handoff decision technique to achieve optimum tradeoff between set of handoff decision criteria. Finally, sensitivity analysis of system parameters on four traffic classes and two vertical handoff decision algorithms along with intelligent vertical handoff decision method were presented. Conclusion: The results of sensitivity analysis depicted that the VHO process in next generation wireless system needs intelligent criteria based technique at the decision making phase of VHO process.

show abstract

“…one. In a soft handoff, also called "make before break", an MS can communicate and connect with more than one access network during the handoff process [15,17].…”

Section: Organization Of the Dissertationmentioning

confidence: 99%

“…The cost function based approaches [15,27,[53][54][55][56][57][58][59] combine different system's metrics in a cost function that represents a measure of the benefit obtained by handing off to a particular candidate network. For every candidate network, the sum of weighted functions of specific parameters is evaluated to produce the final cost of the network.…”

Section: Cost Function Based Algorithmsmentioning

confidence: 99%

VHITS: Vertical Handoff Initiation and Target Selection in a Heterogeneous Wireless Network

Kaleem¹

View full text Add to dashboard Cite

Multiservice Vertical Handoff Decision Algorithms

Cited by 84 publications

References 7 publications

Enhanced IMS Handoff Mechanism for QoS Support over Heterogeneous Network

Enhanced IMS Handoff Mechanism for QoS Support over Heterogeneous Network

Analytic Performability Model of Vertical Handoff in Wireless Networks

VHITS: Vertical Handoff Initiation and Target Selection in a Heterogeneous Wireless Network

Contact Info

Product

Resources

About