Robust SuperPoll Robust SuperPoll Protocol for IEEE Protocol for IEEE 802.11 Wireless LANs802.11 Wireless LANs

SamegleDeprtment of Computer

Engineering,Kasetsart Unversity

Agendo

IEEE 802.11 PCFSingle Polling Concept in

Noisy EnvironmentsProposed SuperPoll with

Chaining ApproachPerformance Results Summary

IEEE 802.11 PCF

• The PCF protocol is based on a Polling Scheme controlled by the Point Coordinator (PC). A station with data for transmission in the contention free period has to register first with the PC in the contention period.

IEEE 802.11 PCF

• The PC maintains the list of registered stations and polls each one according to the polling list. Each polled station is allowed to transmit one MAC Protocol Data Unit (MPDU).

• The destination is expected to acknowledge the packet right after its reception. In case the packet was not properly received at the destination, the source station will be able to retransmit the packet only when it is polled the next time.

• PC controls the medium by broadcasting a Beacon which cent ains the CF Parameter Set Element. The Beacon will be issued at the rate specified in the Contention-Free Repetition Rate (CFPRate).

Single PollingSingle Polling

• MS sends a PT to each MT in the BSS• Each MT responses with DT or NTS

• Destination MT will response with ACK− If no ack receives MT will wait for a T to

retransmit in the next

Proposed solution: SuperPoll with Chaining Approach

Protocan Explanation

Performance

Performance Analysis

Resultants

Bye-Bye : )