Intérêt de la communication direct entre équipements mobiles dans les réseaux radio sans fil.

Abstract : This thesis studies D2D communication in realistic and challenging scenarios for future wireless systems. In particular, the thesis focuses on how may D2D communication help other technologies to enhance their performance. The first wireless scenario is the one of multicasting, used for example in video streaming or common alert message transmission for police, firefighters or ambulances. The second wireless scenario is the critical one of URLLC expected to be used to avoid cars crashes in the upcoming V2X context, and also when connecting machines together in environments like connected hospitals, airports, factories (industry 4.0), and last but not least in e-health context in order to enhance medical tele-surgery. The last wireless scenario is the one of UE group localization in the context of massive IoT, where devices are interacting with each other and are mostly confined in local groups, needing local services. In the multicast channel scenario, where a transmitter wishes to convey a common message to many receivers, it is known that the multicast rate decrease as the number of UEs increases. This vanishing behavior changes drastically when enabling the receivers to cooperate with each other via D2D. Indeed, the multicast rate increases with high probability when the number of receivers increases. This chapter also analyzes the outage rate of the proposed scheme in the same setting. Extensions regarding firstly resource utilization and secondly considering the use of HARQ are also analyzed. Next chapter addresses one of the major challenges for future networks, named URLLC. Specifically, the chapter studies the problem of HARQ with delayed feedback, where the transmitter is informed after some delay on whether or not his transmission was successful. The goal is to minimize the expected number of retransmissions subject to a reliability constraint within a delay budget. This problem is studied at two levels: (i) a single transmitter faced with a stochastic i.i.d. noisy environment and (ii) a group of transmitters whom shares a collision channel. Then the chapter that follows provides a cooperative UE mapping method that is highly accurate. Four different channel models are studied in this chapter: LOS and NLOS for indoor and outdoor environments. The results show significant improvement compared to already existing methods. Identifying the dense local areas in real time and informing the network allows the Base Station (BS) to increase the capacity through highly directive beams, and therefore, avoids the deployment cost of new infrastructure.
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Theses
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https://tel.archives-ouvertes.fr/tel-01940663
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Submitted on : Friday, November 30, 2018 - 2:13:06 PM
Last modification on : Tuesday, May 14, 2019 - 8:38:40 AM
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Thomas Varela Santana. Intérêt de la communication direct entre équipements mobiles dans les réseaux radio sans fil.. Mathématiques générales [math.GM]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLC083⟩. ⟨tel-01940663⟩

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