Context aware vertical soft handoff algorithm for heterogeneous wireless networks
- Authors: Yang, Kemeng , Gondal, Iqbal , Qiu, Bin
- Date: 2008
- Type: Text , Conference paper
- Relation: Proceedings of the 68th IEEE Vehicular Technology Conference p. 1266-1270
- Full Text: false
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- Description: Soft handoff in WCDMA systems allows multi connection between the user and base stations during handoff, in contrast to single connection in hard handoff. But multi connection flexibility leads to a trade-off between quality of service for the user and the system downlink capacity. The heterogeneous wireless networks consist of WCDMA and WLAN systems, which operate at different frequency with no direct interference. Therefore, a vertical soft handoff between downlink shared channels from WCDMA and WLAN will not suffer similar side effects as the horizontal soft handoff in WCDMA systems. In this paper, we present an analytical framework for vertical soft handoff and propose a context-aware vertical soft handoff algorithm (CAVSH) for heterogeneous wireless networks. CAVSH considers four user and system context parameters such as user required bandwidth, user traffic cost, access network utilization, and signal to interference-and-noise ratio (SINR). The results show that the proposed CAVSH can provide the system with lower dropping probability, lower average cost to the user and higher throughput, as compared with vertical hard handoff.
Multi-dimensional adaptive SINR based vertical handoff for heterogeneous wireless networks
- Authors: Yang, Kemeng , Gondal, Iqbal , Qiu, Bin
- Date: 2008
- Type: Text , Journal article
- Relation: IEEE Communications Letters Vol. 12, no. 6 (2008), p. 438-440
- Full Text: false
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- Description: Vertical handoff in next generation heterogeneous wireless networks is a multi-dimensional issue. In this article we propose a multi-dimensional adaptive SINR based vertical handoff algorithm (MASVH) which uses the combined effects of SINR, user required bandwidth, user traffic cost and utilization from participating access networks to make handoff decisions for multi-attribute QoS consideration. Simulation results confirm that the new MASVH algorithm improves the system performance in terms of higher throughput and lower dropping probability, as well as reduces the user traffic cost for accessing the integrated wireless networks.
Efficient utilization of WLAN networks in the next-generation heterogeneous environments
- Authors: Haider, Ammar , Gondal, Iqbal , Kamruzzaman, Joarder , Qiu, Bin
- Date: 2010
- Type: Text , Conference paper
- Relation: Vol. , no. (2010), p.398-403
- Full Text: false
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Priority based expansion of neighborhood size for heterogeneous traffic routing in WSN
- Authors: Rizal, Muhammad Nur , Gondal, Iqbal , Haghighi, P. Delir , Qiu, Bin
- Date: 2012
- Type: Text , Conference paper
- Relation: 9th ACM International Symposium on Performance Evaluation of Wireless Ad Hoc, Sensor, and Ubiquitous Networks, PE-WASUN 2012 p. 101-106
- Full Text: false
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- Description: This paper presents a new routing scheme that adapts to the requirements of heterogeneous traffic. The proposed scheme introduces further improvements to our developed ExtTeGAR algorithm. The aim of the scheme is to achieve low latency and to satisfy multiple quality of service (QoS) in various network conditions. In doing so, the proposed approach exploits multiple nodes’ attributes such as energy, distance to the base station (BS), history of hop delay of data to neighbors and probability of link availability to determine the best node for delivering different traffic requirements. The contribution of the scheme is its ability to differentiate the required data-related to each type of traffic and give different priorities to different data categories so that each type of traffic classification ensures to meet the demands of the application requirements. The proposed scheme uses a distance-based and a location-aware approach to create a shortest path for type of packets with given deadlines and it provides adaptability to increase the transmission range to expand the neighborhood sizes for data delivery continuation. The paper shows that the proposed scheme outperforms an existing QoS routing algorithm (SPEED) in various application scenarios and different network sizes.
Priority based expansion of neighbourhood size for heterogeneous traffic routing in WSN
- Authors: Rizal, Muhammad Nur , Gondal, Iqbal , Delir Haghighi, Pari , Qiu, Bin
- Date: 2012
- Type: Text , Conference paper
- Relation: ACM International Symposium on Performance Evaluation of Wireless Ad-Hoc, Sensor, and Ubiquitous Networks p. 101 - 106
- Full Text: false
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