Performance analysis of mobile relays for LTE

Yangyang Chen 1, 2
1 ADOPNET - Advanced technologies for operated networks
UR1 - Université de Rennes 1, Télécom Bretagne, IRISA-D2 - RÉSEAUX, TÉLÉCOMMUNICATION ET SERVICES
Abstract : Currently, the number of users using wireless broadband services is rising greatly with the introduction of smart phones, tablet computers and other new mobile devices. However, the service quality in public transportation vehicles is far from satisfactory. Public transportations are usually well shielded with coated windows, which leads to a rather high penetration loss between outdoor and in-vehicle. Traditionally, the UEs inside the public transportations connect to the macro base stations via wireless links, in which the penetration loss severely attenuates the signal quality and decreases the achievable data rate. Furthermore, during the handover procedure, a large group of UEs perform handover simultaneously, which causes signaling congestion. To offer high-quality services to vehicular UEs, a relay is mounted in a vehicle with an external antenna to have a good link budget with the eNodeB and an antenna in the bus to provide an optimal link budget with vehicular UEs. This thesis investigates the deployment of mobile relay in LTE network from two aspects: mobility management and performance. We first study the different signaling procedures when a mobile relay is embedded in a public transport vehicle. We propose to keep the protocol stack that was defined for fixed relay and to extend it to mobile relays. The concept of global tunnel, which gathers several tunnels, is proposed to optimize the handover procedure of mobile relay nodes. In the performance study, we analyze the different interference cases. Two new types of interferences, Relay-to-Relay interference and Relay-to-UE interference are identified. We study the data rate gain of a UE provided by a mobile relay deployed in a hexagonal network with Monte Carlo simulation and in a random network by using stochastic geometry. We then investigate the capacity gain brought by mobile relays with multiple users and multiple relays. Important metrics like the CDF of the SINR and the CDF of the end-to-end rate are derived. Furthermore, we propose a TDD/FDD hybrid mobile relay mode, motivated by the fact that a vehicular UE is static relative to its serving mobile relay and close to it, which leads to a relatively good channel condition on the access link. In addition, we evaluate and compare the performance of different system modes using the proposed analytical model.
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Yangyang Chen. Performance analysis of mobile relays for LTE. Networking and Internet Architecture [cs.NI]. Télécom Bretagne; Université de Rennes 1, 2015. English. ⟨tel-01298046⟩

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