Brian Classon

Device-to-device proximity discovery for LTE systems

Device-to-device (D2D) proximity discovery enables spectral reuse via D2D communications as well as a range of innovative proximity services, such as enhanced social networking and location services. To develop a scalable discovery mechanism, signals transmitted by geographically disparate devices should not differ drastically in their received power at each monitoring device. Discovery schemes are proposed to deal with this near-far issue. Analysis and simulation results are provided to characterize the performance of discovery schemes.

Design of a D2D Overlay for Next Generation LTE

With the ever-growing popularity of smartphones, new services are emerging where the local and positioning aspects becomes more important. Additionally, new types of traffic, such as vehicle-to-vehicle communications are being developed. In order to address these new trends, release-12 of LTE has started to evaluate, and possibly standardize, solutions for device-to-device (D2D) communication. This provides the foundations for the deployment of a D2D overlay. However, this should be viewed as a first step, and future LTE releases should encompass more advanced D2D communication techniques and architectures. In this paper, after reviewing the standardization progress for LTE in release-12, several possible improvements are examined for future releases both D2D discovery and communication. It is shown that the future D2D architecture should exploit the network when possible in order to provide an improved user experience and satisfy the need for more local services.