In this paper we try to see how dual soft handoff is effective in achieving higher efficiency in terms of dropping probabilities in relation to various distances and speeds along with consideration for different types of roads while selecting a combination of three emerging algorithms for Dual Soft Handoff. Moreover we go deeper into the actual workings of DSH with some results based on these parameters.
Published In : IJCSN Journal Volume 3, Issue 1
Date of Publication : 01 February 2014
Pages : 55 - 65
Figures : 07
Tables : 13
Publication Link : IJCSN-2014/3-1/Evaluation-of-Dual-Soft-Handoff-in-A-Seamless-Roaming-Environment
The proposed Soft-Dual-Handoff scheme aims at providing high quality data link for the rapid motion nodes. It has high reliability, which is important for applications such as subway control, video or audio transmission. If one link is broken- down, the SDH switch automatically to single network card mode, which can earn time for resuming from failure. The SDH requires only the cooperation of mobile nodes, and AP needn’t any modification. Therefore, AP can adopt standard IEEE 802.11 serial products to save investment.
In fast MSs, a handoff occurs frequently in WLANs due to their small coverage area. It implies that the frequency of handoff s will increase especially in WLANs, so a large number of handoff requests must be handled. Therefore, the handoff dropping probability is increasing, and the service quality (e.g., GoS) becomes worse. On the other hand, the CDMA system is large enough to accommodate fast MSs, and lower handoff request rates, thus resulting in lower burden and good service quality. It is safe to assume that either slow or stationary MSs transmit more data and that fast moving stations communicate at lower data rates. Therefore, according to the MS speed, the load balancing handoff between WLAN and CDMA results in good service quality and the avoidance of unnecessary handoff s. Our proposed methods adopt the mobility management concept through the MS speed cost function to minimize the GoS.
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