In this article we propose to facilitate local peer-to-peer communication by a Device-to-Device (D2D) radio that operates as an underlay network to an IMT-Advanced cellular network. It is expected that local services may utilize mobile peer-to-peer communication instead of central server based communication for rich multimedia services. The main challenge of the underlay radio in a multi-cell environment is to limit the interference to the cellular network while achieving a reasonable link budget for the D2D radio. We propose a novel power control mechanism for D2D connections that share cellular uplink resources. The mechanism limits the maximum D2D transmit power utilizing cellular power control information of the devices in D2D communication. Thereby it enables underlaying D2D communication even in interference-limited networks with full load and without degrading the performance of the cellular network. Secondly, we study a single cell scenario consisting of a device communicating with the base station and two devices that communicate with each other. The results demonstrate that the D2D radio, sharing the same resources as the cellular network, can provide higher capacity (sum rate) compared to pure cellular communication where all the data is transmitted through the base station. problems are observed in the context of cognitive radios [1] [2] [3] , where the cellular usage is the primary service. In order to control the interference from D2D connections to the cellular network, we propose that the Base Station (BS) is able to control the maximum transmit power and the resources to be used for each D2D connection. Note that such a scenario is different from pure ad-hoc networks, without coordination from an infrastructure network, e.g. [4, 5] . Further, we present a novel power control mechanism for D2D connections that share cellular uplink resources. The mechanism limits the maximum D2D transmit power, utilizing cellular power control information of the devices in D2D communication. The performance of D2D and cellular communications is evaluated by means of system simulations that include interference from multiple cells. Secondly, we study a single cell scenario consisting of a device communicating with the BS and two devices that communicate with each other. We consider three modes of operation: D2D communication can share either uplink (UL) or downlink (DL) resources with the cellular network or use exclusive resources. If direct communication between the terminals is not beneficial, the two devices communicate through the BS of the cellular network. In semi-analytical studies we show that the D2D radio, sharing the same resources as the cellular network, can provide higher capacity (sum rate) than pure cellular communication through the BS. This article is organized as follows: In Section 2 we present the motivation for mobile D2D communications with an example application and give a brief overview of the state of the art in D2D communication. In Section 3 we present the power control mechanism for the coexistence of D2D and cellular transmissions. In Section 4 we describe the simulation methodology and present the simulation results. In Section 5 the semi-analytical analysis is described and results are presented. In Section 6 we present results on indoor D2D connections sharing the DL resources with a metropolitan area network. In Section 7 we summarize our results and the conclusions are given.
The work in REF controls the interference of the D2D links to the cellular users by limiting the maximum transmit power of the D2D users.
Device-to-Device Communication Underlaying Cellular Communications Systems
IJCNS
IJCNS
Computer Science