ELT-53506, Seminar course on networking
Tampere University of Technology
Responsible person: D. Moltchanov, e-mail: dmitri.moltchanov at tut.fi
In this course a student is required to select a topic of interest, carry out investigation/research on this topic and then provide the results in terms of a scientific report (approximately 10 pages) and seminar presentation. This course is useful for those wanting to test what research work/environment is all about. There are no strict admission dealines for this course as it is always up inlcluding summer months. A student wanting to join the course is supposed to notify the responsible person (see above) regarding the chosen topic. One may also suggest its own topic if it falls to the area of networking and communications. Then, to take a decision about admission, a meeting with a prospected supervisor is organized.
According to many predictions, the proportion of traffic transmitted over wireless networks is expected to grow considerably in the very near future. Consequently, the currently deployed mobile broadband technologies are very likely to face serious overloads resulting in the shortage of available capacity and dramatic degradation in the levels of quality of experience for their end clients. It is expected, however, that substantial gains in spectral efficiency may be achieved by enabling direct communication between the user devices. Generally, device-to-device (D2D) connectivity should allow for dramatic increase in the levels of spectral reuse and cooperation. In particular, neighboring wireless network clients may communicate directly without involving the network infrastructure. This work involves exploring the potential of coverage and connectivity improvements with D2D communication and cooperation as well as focusing efficient techniques and mechanisms for device awareness, partner discovery, device pairing, and distributed scheduling.
Whereas insufficient system capacity and coverage are indeed important factors in degrading user service experience, the existing wireless deployments also suffer from a lack of uniformity. Users at the cell edges typically have the poorest link quality due to excessive distance to the base station, but at same time generate (and suffer from) the most interference. Cellular coverage also remains unsatisfactory in indoor environments. Targeted at providing uniform and reliable user experience, the contemporary multi-tier networks focus aggressive spectrum reuse and more sophisticated techniques for interference coordination. As these technologies are being investigated only recently, the performance gains achievable with varying levels of multi-cell and multi-tier cooperation are not nearly well-understood. This work includes analyzing the performance limitations of multi-RAT communication, developing optimized RAT association, selection, and assignment mechanisms, as well as proposing low complexity coexistence-aware protocols for multi-radio devices.
While the lionís share of the ongoing research efforts is targeted to improve spectral efficiency, energy efficiency is becoming increasingly important for beyond-4G wireless systems due to the limited battery resources of mobile clients. The incentive to achieve all-time wireless connectivity should not, ideally, compromise the need to preserve the battery life of small-scale wireless devices and maximize their operation time without recharging. Given this constraint, intricate performance trade-offs arise between an individual device and the entire network. This work includes designing energy efficient communication protocols for best-connected devices as well as considering energy when selecting a network and performing multi-RAT hang-offs.