Performance analysis of cellular networks with mobile relays under different modes

Abstract

International audienceWith the popularity of smart phones and tablets, people make intensive use of these devices on public transport. The deployment of mobile relays on public transport may increase the quality of mobile services. The objective of this paper is to study the performance of cellular networks when mobile relays are deployed in public transport vehicles. We consider two modes: in the FDD mobile relay mode, the same spectrum is reused for all links while in the TDD/FDD hybrid mode, a small part of the spectrum is dedicated to the access link between the terminals inside a transport vehicle and the mobile relay. We provide a general analytical model for the two mobile relay modes by using the stochastic geometry approach. Key metrics like the CDF of the SINR and the CDF of the end-to-end rate are computed. Furthermore, the cell total average rate and the energy efficiency in different modes are evaluated. It has been found that penetration loss is a factor that determines how much gain mobile relay can bring. Numerical results show that when the ratio of vehicular UEs in the cell is 0.4 and the penetration loss is 20 dB, the FDD mobile relay mode and the TDD/FDD hybrid mobile relay mode can achieve +16.3, +29.1% cell rate gain respectively compared with the direct mode

Mobile relays for urban rail transportation systems

“…The authors show that the addition of mobile relay nodes can improve the overall cell network performance in the railway environment. In [11], stochastic geometry is used to compute the throughput and the energy consumption of a network with mobile relays. However, the analysis is based on snapshots and does not consider the dynamic nature of the traffic.…”

“…This indicator is computed as ξ u = t lp,u − t fp,u (11) where t lp,u is the time stamp of the last packet received by the UE.…”

Performance of Mobile Relays in Loaded Conditions for Railway Transportation

“…Other works have pointed their attention to the data rate gain aspect [7], [8], [9], [10] and [11]. The authors analyse in [7] the data rate gain provided by a mobile relay deployed in public transportation systems.…”

“…In [8], authors studied the performance of dual-hop transmission with a mobile relay and with a fixed relay by means of a theoretical analysis and simulations and proved the benefit of mobile relays when the penetration loss is above 25 dB. In [9], stochastic analysis is used to compute the capacity of a cell when mobile relays are used. In [10] joint transmission by both a mobile relay and a macro-cell base station is proposed to improve the data rate of non-vehicular UEs and the outage probability is derived.…”

Mobile Relay for LTE: Proof of Concept and Performance Measurements

“…In [3], the authors studied the performance of dual-hop transmission with a mobile relay and with a fixed relay by means of a theoretical analysis and proved the benefit of mobile relays when the penetration loss is above 25 dB. In [4], stochastic analysis is used to compute the capacity of a cell when mobile relays are deployed. In [5] joint transmission by both a mobile relay and a macro-cell base station is proposed to improve the data rate of non-vehicular UEs and the outage probability is derived.…”