Abstract
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 mul-timedia services. The main challenge of the underlay radio in a multi-cell environment is to limit the inter-ference 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 net-work, can provide higher capacity (sum rate) compared to pure cellular communication where all the data is transmitted through the base station.
Highlights
Major effort has been spent in recent years on the development of next-generation wireless communication systems that will bring higher data rates and system capacity to end users and network operators
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
We show that given proper power control and coordination mechanisms it is possible to have D2D connections that reuse cellular band and still cause only minimal interference to the cellular network
Summary
Major effort has been spent in recent years on the development of next-generation wireless communication systems that will bring higher data rates and system capacity to end users and network operators. In this article we propose to facilitate the local peer-topeer communication by a Device-to-Device (D2D) radio that operates as an underlay network to an IMT-Advanced cellular network. This D2D radio is a potential key enabler for low cost, seamless and high capacity local connectivity. Cellular operators may offer such cheap access to spectrum with controlled interference enabled by D2D communication as underlay to the cellular network This concept is illustrated, where UE denotes User Equipment. Compared to other local connectivity solutions based on for example Bluetooth or WLAN the D2D communication supported by a cellular network offers additional compelling advantages. The cellular network can distribute encryption keys to both D2D devices so that a secure connection can be established without manual pairing of devices or entering encryption keys
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