Group Handover Scheme Using Adjusted Delay for Multi-Access Networks

Lee, Woongsup; Cho, D.-H.

doi:10.1109/icc.2010.5502211

Cited by 7 publications

(2 citation statements)

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“…First, by relaying signals through the onboard relay, it is possible to avoid severe signal penetration loss due to a metallic vehicle body, which can be up to 20-35 dB [2]. Second, the relaying architecture is also advantageous to avoid the problem of so-called signaling storm due to group handover, which arises in a situation when a lot of UEs (there may be hundreds of active UEs in a train) cross the cell boundary and try to perform handover at the same time, thereby leading to network congestion and handover failure [2], [42].…”

Section: System Descriptionmentioning

confidence: 99%

Realizing Multi-Gbps Vehicular Communication: Design, Implementation, and Validation

et al. 2019

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This paper proposes a vehicular communication system that can achieve multi-Gbps data rate transmission for train and car applications. Employing a millimeter-wave frequency band around 25 GHz, the proposed system provides mobile backhaul connectivity for vehicle user equipments (UEs). In order to support a very high data rate with such a high carrier frequency while guaranteeing sufficient robustness against high mobility-related behaviors such as fast channel variation and unstable handover, we employ a relaying network architecture consisting of a backhaul link to a vehicle UE and an in-vehicle access link. Based on that, we provide a set of fundamental design elements including numerology, frame structure, the reference signal, multi-antenna scheme, and handover. We then validate the proposed vehicular communication system by implementing an experimental testbed consisting of baseband modem, RF front end, an array antenna units, and by performing field trials in an actual subway tunnel and urban road environments. The experimental validation results reveal that providing multi-Gbps backhaul transmission is possible and worthwhile for both train and car scenarios. INDEX TERMS 5G, high mobility, mmWave, testbed, vehicular communications.

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Section: System Descriptionmentioning

confidence: 99%

Realizing Multi-Gbps Vehicular Communication: Design, Implementation, and Validation

et al. 2019

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“…RSUm transmits the vehicles' authentication messages to RSUn in advance to shorten the time for authentication as well as handover delay. Group handover in the multi-access network (many vehicles handover to the same RSU at the same time) was studied in [17]. To resolve the possible problem of congestion, a group handover mechanism was proposed in it to prevent a large number of vehicles from switching simultaneously.…”

Section: Related Workmentioning

confidence: 99%

Game Approach for Handover Scheme Based on Road-section in VANET

Wu¹,

Liang²

2014

JCP

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In VANET (Vehicular Ad Hoc Network), vehicles moving from one RSU's coverage region to another will cause access congestion problem if vehicles use improper handover scheme. In this paper, we present a novel mobility handover scheme for vehicles with seamless Internet access in urban VANET scenario, which is called Game approach for Handover Scheme based on Road-section (GHSR). The main advantages of our scheme are that it uses Sequential Game and it based on 802.11p standard proceeding from service and the vehicles needing to handover will game each other to gain no smaller payoff by selecting an appropriate road-section. Performance evaluations demonstrate that our scheme outperforms the threshold scheme significantly in terms of both the traffic load of RSUs and the QoS (Quality of Service) of vehicles users, and QoS of vehicle users increase by up to 33.68%. Index Terms-Urban VANET; Sequential Game; Handover I. INTRODUCTION VANET is a special Mobile Ad Hoc Networks (MANET), which consists of the Infrastructures (Road Side Units, RSUs) and vehicles equipped with Onboard Units (OBUs) that provide the basic wireless communication capability. VANET is characterized by high speed mobile users and frequent network topology change. In recent years, with the deployment of RSUs, many researchers consider using 802.11p standard to realize the interaction between vehicles and Internet by accessing to RSUs, whose feasibility is confirmed [1]. In VANET, based on some communications protocols specially designed for VANET, such as [2], the communication usually occurs among Vehicles (Vehicleto-Vehicle, V2V), or between Vehicle and Infrastructure (Vehicle-to-RSU, V2R) [3]. When services are being provided by RSUs, seamless handover is desired for continuous connectivity to provide uninterrupted service when the vehicle moves from one RSU's region to another, as seen in Fig. 1. Under the IEEE802.11p, the handover progress removes the identification and interaction of wireless networks, such as Wi-Fi and so on, since IEEE802.11p is a protocol for VANETs that is designed for communication during high-speed mobility (up to 200 km/h) among vehicles or between vehicles and RSUs with a range of up to 1,000m [18]. In addition, few vehicles can provide or share their own service to others, in VANET. Therefore, in order to guarantee vehicles to

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