Abstract
Problem statement: Medium Access Control (MAC) protocol plays an important role in providing a fair and efficient allocation of limite d bandwidth in wireless LANs. In IEEE 802.11 standard protocol, data rate selection is not speci fied. Rate control is the process of switching data rates dynamically based on channel conditions, with the t arget of selecting the rate that will provide the maximum throughput feasible for a given channel condition. The two major components of the rate control process are Channel estimation and rate sel ection. Although rate control has been studied extensively for wired networks, these results canno t be directly applied to multihop wireless networks . Approach: In this study, we propose to develop an Optimal Ra te Adjustment Algorithm (ORAA) which is based on the channel state conditions. We also follow a two level channel estimation one at the receiver end and another at each intermediate n ode along the path. Results: By simulation results we show that our proposed ORAA achieves high throughput and fairness, when compared with the standard IEEE 802.11 MAC protocol. Conclusion: In ad hoc networks, where the channel conditions are dynamic, our proposed ORAA provides the accurate data rate most suitable for the current changes in the network.
Highlights
Multi hop ad hoc networks: A set of nodes that can communicate with each other devoid of well-known infrastructure or centralized control is termed as multihop wireless ad hoc networks
Suppose if a path has many links with both GOOD2 and BAD2 states, in such cases the path is valid only if it contains the maximum number of links with state GOOD2 else the path is invalid (i.e.,) not Optimal Rate Adjustment Algorithm (ORAA): In prior to swapping the RTS/CTS with the receiver, a sender contends for the channel
Performance metrics: We compare the performance of our proposed Optimal Rate Adjustment Algorithm (ORAA) with the ADCF scheme in (Ye et al, 2009)
Summary
Multi hop ad hoc networks: A set of nodes that can communicate with each other devoid of well-known infrastructure or centralized control is termed as multihop wireless ad hoc networks. Related work: Priakanth and Thangaraj (2009) Cooperative Rate Adaptation (CRA) for promoting proposed a channel adaptive Energy efficient Medium Access Control (MAC) protocol in an ad hoc network In their approach, initially each node computes the channel and link quality for each contending flows. Ye et al (2009); Zhou et al (2007); Wang et al (2007); Zhang et al (2008); Chen et al (2007); Bandai et al (2008); Nguyen et al (2011); Pillai et al (2010); Jahromizadeh (2011) and Hu et al (2011) have investigated the performance of IEEE 802.11 in multi hop scenarios and have shown how its aggressive behavior could throttle the spatial reuse and reduce bandwidth efficiency They have proposed an adaptive, layer-2 distributed coordination scheme for 802.11 using the explicit MAC feedback in order to speed the transmissions on adjacent nodes. Their proposed SGRA have addressed all identified challenges and was fully compliant with
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