A bandwidth sharing approach to improve licensed spectrum utilization

Abstract

The spectrum of deployed wireless cellular communication systems is found to be underutilized, even though licensed spectrum is at a premium. To efficiently utilize the bandwidth left unused in a cellular system, the primary system (PRI), we propose an overlaid ad hoc secondary network (ASN) architecture, with the ASN operating over the resources left unutilized by the PRI. Our basic design principle is that the ASN operates in a nonintrusive manner and does not interact with the PRI. In this article we present the ad hoc secondary medium access control (AS-MAC) protocol to enable PRI-SEC interoperation, address a number of technical challenges pertinent to this networking environment, and evaluate the performance of the AS-MAC. In a single-hop ASN the AS-MAC transparently utilizes 75 percent of the bandwidth left unused by the PRI, while in multihop ASNs, due to spatial reuse, the AS-MAC can utilize up to 132 percent of the idle PRI resources in our experiments.

Dynamic Spectrum Access Protocol Without Power Mask Constraints

“…. , M (a similar assumption is made in [6], [11], [26]). Such a channel is not necessarily dedicated to the CRN.…”

“…AS-MAC [6] is a spectrum-sharing protocol for CRNs that coexist with a GSM network. CR users select channels based on the CRN's control exchanges and the GSM network's broadcast information.…”

Spectrum Management of Cognitive Radio Networks

“…Hemos tomado como base el protocolo MAC (Medium Access Control) presentado en [9], el cual describiremos en la sección 2.2.…”

“…Una vez obtenida la información sobre los recursos radio disponibles, el protocolo MAC propuesto en [9] permite la comunicación entre dos SU, respectivamente el SU emisor y el SU receptor. Básicamente, a través de este protocolo los dos SU llegan a un acuerdo sobre el canal que van a utilizar para su comunicación.…”

A Survey of Dynamic Spectrum Access: Signal Processing and Networking Perspectives

“…Opportunity identification in the presence of fading and noise uncertainty has been studied in [38][39][40][41]. Spatial opportunity allocation among secondary users can be found in [42][43][44] and references therein.…”