Multihop Relaying in Millimeter Wave Networks: A Proportionally Fair Cooperative Network Formation Game

Abstract

Abstract-Millimeter wave channels suffer from considerable degradation in the channel quality when the signal is Non Line of Sight (NLOS) between the source and the destination. Multihop relaying is thus anticipated to improve the communication between a source and its destination. This is achieved by transmitting the signal to a sequence of relays in which a Line of Sight (LOS) signal exists between two nodes along the path, or more generally when the signal is better than the transmitted signal directly from the source to the destination. In this paper, we consider a millimeter wave network composed of multiple sourcedestination pairs and a set of deployed relays. We formulate the problem of multihop relaying as a cooperative network formation game in which each relay chooses which source-destination pair to assist in order to improve the end-to-end performance, that is, the multihop delay between the source and the destination. Further, we present an algorithm based on the Nash Bargaining Solution to ensure fairness among the different source-destination pairs and assess its efficiency on numerical simulations.

Physical Layer Enhancement for Next-Generation Railway Communication Systems

“…The scenario proposed in 3GPP assumes only a single mobile relay located on top of train carriages. However, the benefits of implementing a single mobile relay with distributed antennas, or multiple relay nodes such as mobile relays both at the front and rear of a train, or even multiple mobile relays located on top of multiple trains have been investigated in [2], [6], [46], [75]- [80]. Two basic schemes are considered: (i) multi-hop relaying and (ii) cooperative transmission.…”

“…Two basic schemes are considered: (i) multi-hop relaying and (ii) cooperative transmission. In multi-hop relaying schemes, different metrics, such as optimal routing path selection [77], end-to-end delay [77], [78], secrecy [79], throughput [75], [77], [79], and fairness [80], as well as combinations of such metrics have been considered. Adopting the same simulation assumptions as in [75], a system-level simulation to evaluate the mobile relay multi-hop transmission is illustrated in Fig.…”