An SRN Model of the IEEE 802.11 DCF MAC Protocol in Multi-Hop Ad Hoc Networks with Hidden Nodes

Abstract

Since its development for WLAN, IE E E 802.11 standard has been widely used for various wireless networks due to the low cost and effectiveness in reducing collisions with simple and decentralized mechanisms. In this paper we present a novel analytical SRN model for performance evaluation of IE E E 802.11 D C F MAC protocol in multi-hop ad hoc networks in the presence of hidden nodes, taking into account the characteristics of the physical layer, different traffic loads, packet size, and carrier sense range. The proposed model captures most features of the protocol. Performance measures such as throughput and packet service time for various network configurations are computed. The proposed models are validated through extensive simulations.

Misbehavior analysis of IEEE 802.11 MAC layer in mobile ad hoc network using stochastic reward nets

“…18 In RTS/CTS mechanism, 26 when a node has a packet to transmit, it should sense the channel idle for a period longer than or equal to a distributed interframe space (DIFS). The most efficient MAC layer protocol that is used as an IEEE standard is a variation of CSMA equipped with Carrier Sensing (CA) technique known as IEEE 802.11 (DCF).…”

“…The most efficient MAC layer protocol that is used as an IEEE standard is a variation of CSMA equipped with Carrier Sensing (CA) technique known as IEEE 802.11 (DCF). 18,21,23 18 In RTS/CTS mechanism, 26 when a node has a packet to transmit, it should sense the channel idle for a period longer than or equal to a distributed interframe space (DIFS).…”

“…18,26,27 The whole process for the RTS/CTS mechanism is illustrated in Figure 2. The sender also sends this control packet after Short Interframe Space (SIFS) time interval.…”

“…18 A S , which is the average number of slots a node spends in its backoff stage, is derived from one node operation model. They send data over common channel with a rate λ. Supposing M legitimate and M m misbehavior node communicating in a network with dimension a, there could be N legitimates and N m misbehavior nodes in a neighbor area.…”

“…This protocol combines carrier sense multiple access/collision avoidance (CSMA/CA) with 2 known handshake methods as RTS/ CTS and basic access handshake method to avoid collisions. 18 In RTS/CTS mechanism, 26 when a node has a packet to transmit, it should sense the channel idle for a period longer than or equal to a distributed interframe space (DIFS). For a more assured data transmission, when 2 nodes decide to sense channel in the same time, they should back off their data transmission for a certain period based on a value randomly selected from [0, CW], where CW is the contention window size.…”