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Bandwidth Estimation for IEEE 802


Since 2005, IEEE 802.11-based networks have been able to provide a certain level of quality of service (QoS) by the means of service differentiation, due to the IEEE 802.11e amendment. However, no mechanism or method has been standardized to accurately evaluate the amount of resources remaining on a given channel. Such an evaluation would, however, be a good asset for bandwidth-constrained applications. In multihop ad hoc networks, such evaluation becomes even more difficult. Consequently, despite the various contributions around this research topic, the estimation of the available bandwidth still represents one of the main issues in this field. In this paper, we propose an improved mechanism to estimate the available bandwidth in IEEE 802.11-based ad hoc networks. Through simulations, we compare the accuracy of the estimation we propose to the estimation performed by other state-of-the-art QoS protocols, BRuIT, AAC, and QoS-AODV.

Existing System:

  1. The ad hoc networking community assumes that the underlying wireless technology is the IEEE 802.11 standard due to the broad availability of interface cards and simulation models.
  2. This standard has not been targeted especially for multihop ad hoc operation, and it is therefore not perfectly suited to this type.
  3. An accurate evaluation of the capabilities of the routes is necessary. Most of the current QoS proposals leave this problem aside, relying on the assumption that the link layer protocols are able to perform such an evaluation.

Proposed System:

  1. In this system they are using 802.11 MAC layer to evaluate the correct bandwidth.
  2. This method combines channel monitoring to estimate each node’s medium occupancy.
  3. Probabilistic combination of the values is to account for synchronization between nodes, estimation of the collision probability between each couple of nodes, and variable overhead’s impact estimation.
  4. This mechanism only requires one-hop information communication and may be applied without generating a too high additional overhead.
  5. We show the accuracy of the available bandwidth measurement through NS-2 simulations.
  6. These results show that single-hop flows and multihop flows are admitted more accurately, resulting in a better stability and overall performance.

                        System Requirements
RAM                      :    512 MB DD RAM
MONITOR             :    15” COLOR
HARD DISK         :     20 GB
FLOPPY DRIVE   :     1.44 MB
CDDRIVE              :    LG 52X
KEYBOARD         :     STANDARD 102 KEYS
MOUSE                 :    3 BUTTONS

Front End              :  Java, Swing
Back End               :  MS Access
Tools Used            :  JFrameBuilder
Operating System  :  WindowsXP

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