Abstract
This paper proposes a novel vertical handoff algorithm between WLAN and CDMA networks to enable the integration of these networks. The proposed vertical handoff algorithm assumes a handoff decision process (handoff triggering and network selection). The handoff trigger is decided based on the received signal strength (RSS). To reduce the likelihood of unnecessary false handoffs, the distance criterion is also considered. As a network selection mechanism, based on the wireless channel assignment algorithm, this paper proposes a context-based network selection algorithm and the corresponding communication algorithms between WLAN and CDMA networks. This paper focuses on a handoff triggering criterion which uses both the RSS and distance information, and a network selection method which uses context information such as the dropping probability, blocking probability, GoS (grade of service), and number of handoff attempts. As a decision making criterion, the velocity threshold is determined to optimize the system performance. The optimal velocity threshold is adjusted to assign the available channels to the mobile stations. The optimal velocity threshold is adjusted to assign the available channels to the mobile stations using four handoff strategies. The four handoff strategies are evaluated and compared with each other in terms of GOS. Finally, the proposed scheme is validated by computer simulations.
Highlights
There has been a huge development in wireless communication technologies: mobile and WLAN systems
When the signal from the WLAN access point (AP) becomes strong and at the same time the distance between access points (APs) and mobile station (MS) is decreasing and MS speed is smaller than the velocity threshold (VT), the MS is connected to the WLAN
This paper proposed a handoff decision process with network selection that decides the optimal velocity threshold in order to improve GoS and minimize the number of handoff attempts with a given traffic volume in a WLANCDMA integrated network
Summary
There has been a huge development in wireless communication technologies: mobile and WLAN systems. The physical layer parameters such as the received signal strength indication (RSSI) and signal to interference ratio (SIR) are regarded as classical handoff trigger metrics These parameters are insufficient for the challenges raised by the generation of heterogeneous wireless networks since there are many differences in the radio interface, cell coverage, traffic type, data rate, and so forth. In order to take an intelligent and better decision as to which wireless network should be chosen, [16, 17] proposed a fuzzy logic scheme based on RSSI, service type, network conditions, system performance, mobile node capabilities, user preferences, and monetary cost.
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More From: EURASIP Journal on Wireless Communications and Networking
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