Characterising the Behaviour of IEEE 802.11 Broadcast Transmissions in Ad Hoc Wireless LANs

Abstract

This paper evaluates the performance of the IEEE 802.11 broadcast traffic under both saturation and nonsaturation conditions. The evaluation highlights some important characteristics of IEEE 802.11 broadcast traffic as compared to corresponding unicast traffic. Moreover, it underlines the inaccuracy of the broadcast saturation model proposed by Ma and Chen due to the absence of backoff counter freeze process when channel is busy. Computer simulations are used to validate the accuracy of the new model and demonstrate the importance of capturing the freezing of backoff counter in the analytical study of IEEE 802.11 broadcast.

Model-based analysis of a protocol for reliable communication in railway worksites

“…Other works focus on defining good approximations of the physical channel through a channel model; a nice survey on this topic can be found in [15]. Another set of works focuses on the analysis of a specific radio technology or protocol: in [17] and [18] the transmission of multicast packets in wireless LANs is analyzed, while in [13] capacity estimation for downlink WCDMA networks is performed. Conversely, [14] focus on the uplink direction, also considering inter-to-intra cell interference.…”

A Markovian Analysis of Ieee 802.11 Broadcast Transmission Networks With Buffering

“…In particular, this implies that a sequence of slots is not exactly obtained as a pure outcome of repeated Bernoulli trials. Now, starting from the basic one-dimensional models proposed in [1,4], we construct a two-dimensional Markov chain, taking into account the possibility of waiting queues at the stations.…”

“…Nonetheless, to the best of our knowledge, no model has taken into account the possibility of having buffers to store arriving packets which, due to channel occupancy, can not be transmitted. When using the framework developed in [1,4], it is impossible to rigorously evaluate the stability of the protocol. In this paper we use the same key assumption concerning the slots as in [1,4], but we couple it with a Markovian analysis of nodes using the IEEE 802.11 back-off with an infinite buffer for the packets.…”

“…When using the framework developed in [1,4], it is impossible to rigorously evaluate the stability of the protocol. In this paper, we use the same key assumption concerning the slots as in [1,4], but we couple it with a Markovian analysis of nodes using the IEEE 802.11 back-off with an infinite buffer for the packets. We discuss how the way of sensing slots on the channel can give rise to two closely related models.…”

An efficient opportunistic cooperative diversity protocol for IEEE 802.11 networks

“…Furthermore, PRO will only outperform DAF-MAC in highly saturated networks. Wang et al showed that broadcast control packets become increasingly ineffective for topology control in severely congested networks [7]. Figure 6: The losses for both protocols will be equal at the SD transmission probability shown -DAFMAC will be more efficient than PRO if the link quality exceeds this value Therefore, it can be expected that PRO relay selection will also become unstable and result in a high collision rate as network utilisation increases.…”