DFMAC: DTN-Friendly Medium Access Control for Wireless Local Area Networks Supporting Voice/Data Services

Abstract

In this paper, we consider a wireless communication network for both local nodes residing in densely populated hot spots and nomadic nodes roaming in a large area. Wireless local area networks (WLANs) are deployed in the hot spots, while a delay/ disruption tolerant network (DTN) provides services to nomadic nodes in the large area with low node density. We investigate the radio resource allocation for a DTN/WLAN integrated network, and propose a DTNfriendly medium access control (DFMAC) scheme for the hot spots supporting voice/data services. Analytical models are established to characterize the interactions between a DTN and WLANs under the proposed DFMAC. Numerical and simulation results demonstrate that our proposed MAC scheme can provide a deterministic delay guarantee for the voice services of local nodes, while achieving an efficient performance tradeoff for the data services between nomadic nodes and local nodes.Keywords delay/disruption tolerant network (DTN) · wireless local area network (WLAN) · integrated network · medium access control (MAC)

Analyzing the Impact of Access Point Density on the Performance of Finite-Area Networks

“…It is worth noting that, Eq. ( 35) provides an approximation for a lowerbound on the integral (24). Therefore, the fact that in Fig.…”

“…For example, in the discussion associated with Fig. 10-b, we chose a capacity coverage probability threshold of 0.6, i.e., we require that a user at any point in Finally, Figure 12 compares the approximate ergodic user capacity results obtained from the analytical formulation in (35) with those from the integration expression in (24) as well as the exact results from simulations for the two examples of σ L = 0 dB and σ L = 6 dB in an interference-limited network with α = 4. As is clear, there is a close match between the approximate and actual results (the approximate results are always within 10% of the actual capacity for any N).…”

“…Our goal in this paper is to analyze the performance of a circular 1 finite-area network with a finite number of APs. Our motivating examples are indoor networks [21], [22] and outdoor hotspots [23], [24] . We wish to provide a network designer the ability to quickly analyze the impact of various network parameters.…”

“…Comparison between the approximate ergodic user capacity results obtained from the analytical formulation in(35) with those from the integration expression in(24) as well as the exact results from simulations in an interference-limited network with α = 4 for the two examples of: a) σL = 0 dB ; b) σL = 6 dB integration (24) when compared to the exact results, is purely by accident. For instance, as is seen from Fig.…”