Coexistence Mechanism for Colocated HDR/LDR WPANs Air Interfaces
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Research Article Coexistence Mechanism for Colocated HDR/LDR WPANs Air Interfaces Marco Monti,1 Mauro De Sanctis,1 Ernestina Cianca,1 Marina Ruggieri,1 and Ramjee Prasad2 1 Department 2 Center
of Electronic Engineering, University of Rome “Tor Vergata”, Rome, Italy for TeleInfrastruktur, Aalborg University, Aalborg, Denmark
Correspondence should be addressed to Marco Monti, [email protected] Received 2 December 2009; Revised 5 August 2010; Accepted 22 September 2010 Academic Editor: Geert Leus Copyright © 2010 Marco Monti et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper addresses the issues of interference management among Low Data Rate (LDR) and High Data Rate (HDR) WPAN air interfaces that are located in close-proximity (up to 10 cm) and eventually on the same multimode device. After showing the noticeable performance degradation in terms of Bit Error Rate (BER) and goodput due to the out-of-band interference of an HDR air interface over an LDR air interface, the paper presents a novel coexistence mechanism, named Alternating Wireless Activity (AWA), which is shown to greatly improve the performance in terms of goodput of the most interference vulnerable air interface (i.e., the LDR air interface). The main difference of the proposed mechanism with respect to other collaborative mechanisms based on time-scheduling is that it synchronizes the transmission of the LDR and HDR WPANs at the superframe level instead of packet level. Advantages and limitations of this choice are presented in the paper. Furthermore the functionalities of the AWA mechanism are positioned in a common protocol layer over the Medium Access Control (MAC) sublayers of the HDR and LDR devices and it can be used with any standard whose MAC is based on a superframe structure.
1. Introduction An increasing number of transceivers are needed to fulfill the communications need of the modern user, who wants to use a growing variety of applications anytime and anywhere. In most cases, these newly deployed transceivers operates in the same radio band and use antennas that are in close proximity to other transceivers. Sometimes those transceivers are located in the same wireless device. These situations, where multiple air interfaces are positioned in the same multimode device, are referred to as colocated air interfaces. Colocated air interfaces create an increased level of system interference which can affect data transfer significantly by reducing goodput. This paper addresses the issue of the interference management among Low Data Rate (LDR, few kbps) and High Data Rate (HDR, hundreds of Mbps) WPAN air interfaces that are in close-proximity (colocated at a maximum distance of 10 cm) [1]. Recently, the issue of interference evaluation and management between Ultra Wideband (UWB) and narrowband systems has received a wide interest. An overview of
coexistence issues
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