Optimal Distributed Vertical Handoff Strategies in Vehicular Heterogeneous Networks

Abstract

Abstract-This paper addresses the problem of optimal vertical handoff (VHO) in a vehicular network setting. The VHO objective can be minimizing the data transfer time or alternatively minimizing the cost of transmitting traffic. As a framework for performance evaluations, we first analyze a heterogeneous network consisting of a wide-area cellular network interworking with wireless local area networks (WLAN) with fixed interdistance between access points (APs) placed along roadsides. We further analyze a scenario with random inter-distance between WLAN APs. In both aforementioned cases, only Vehicle-toInfrastructure (V2I) capability is assumed. We show that in order to minimize the cost of transmission or alternatively transmission time, performing VHOs is an appropriate choice at lower speeds, whereas it would be better to avoid VHO and stay in the cellular network at higher speeds. We further generalize our study, to investigate the VHO strategies in a random inter-distance scenario with both V2I and Vehicle-toVehicle (V2V) communication capabilities. We demonstrate that the combination of WLAN plus cellular plus ad hoc networking outperforms any other networking strategies considered in this work in terms of transmission times and transmission costs. The presented results provide insightful guidelines for optimal VHO decision making based on the characteristics of the network as well as the user mobility profile.Index Terms-Vehicular Network, Vertical Handoff, Heterogeneous Network, V2I, V2V.

Vertical Handoff In Wlan-Wimax-Lte Heterogeneous Networks Through Gateway Relocation

“…Subsequently it is proved that Session Initiation Protocol (SIP) based IP Multimedia Subsystem registration (IMS) can provide session mobility with optimal service [5]. Optimal vertical handover (VHO) in a vehicular network was proposed recently in 2011 to optimize the cost of transmission [4]. Virtual partitioning with pre-emption technique in cellular/ IEEE 802.16e interworking [6] suggest admission control algorithms through IMS for connection requests considering the class of service (i.e., RT or NRT).…”

Joint Call Admission Control in Integrated Wireless LAN and 3G Cellular Networks

“…In integrated networks, there are two types of handoff: intra-technology handoff and intertechnology handoff (Lampropoulos et al, 2005;Shafiee et al, 2011). The intra-technology handoff is traditional Horizontal Handoff (HHO) in which mobile terminals handoff between two adjacent base stations or access points using same access technology.…”

“…However, the vertical handoff from cellular network to WLAN is regarded as a network selection process, because mobile terminals are in a wireless overlay area where both cellular access and WLAN access are available to mobile terminals at same time. Seamless vertical handoffs face challenges caused by the gap between different QoS levels in cellular network and in WLAN Shafiee et al, 2011): UMTS cellular networks provide wide coverage with high QoS provisioning for voice service, but limited-rate data service. However, WLANs support high-rate data service, but lack of universal roaming ability and suffer from low QoS level for voice service, due to their original real-time constraints.…”

A Threshold Based Handover Triggering Scheme in Heterogeneous Wireless Networks

“…In the existing technical literature, many related studies on VHD have been reported [3,[8][9][10][11][12][13][14][15][16][17][18][19]. In [8], a WLAN to 3G handover decision algorithm was presented based on comparison of the current received signal strength (RSS) and a dynamic RSS threshold when a mobile terminal is connected to a WLAN access point (AP).…”