802.11an MAC Functions
What are MAC functions in IEEE 802.11an?
MAC functions manage frame delimiting, addressing, error detection, and reliable wireless communication in 802.11an.
How does 802.11an MAC ensure reliable data delivery?
It handles acknowledgments, retransmissions, and error checking to guarantee data is correctly received.
What role does CSMA/CA play in 802.11an MAC?
Carrier Sense Multiple Access with Collision Avoidance controls medium access to minimize data collisions.
How does MAC fragmentation work in 802.11an?
Large frames are broken into smaller fragments for transmission and reassembled upon receipt to improve reliability.
What is frame sequencing in 802.11an MAC?
It maintains the correct order of packets by using sequence numbers, avoiding duplication or loss.
How are QoS features managed in 802.11an MAC?
Enhanced Distributed Channel Access (EDCA) prioritizes traffic types for better quality of service.
Does 802.11an MAC support power management?
Yes, it coordinates sleep and wake cycles to reduce energy consumption in client devices.
How are acknowledgments handled by 802.11an MAC?
Immediate and block acknowledgments confirm successful frame reception and enable efficient retransmission.
What types of frames does 802.11an MAC manage?
Management, control, and data frames are handled for network setup, control signaling, and payload transmission.
How does MAC handle retransmissions in 802.11an?
It retransmits frames not acknowledged within a timeout, improving link reliability.
What is the role of MAC addressing in 802.11an?
It uses MAC addresses for source, destination, BSSID, and receiver identification.
How does MAC manage association and authentication?
It processes management frames to establish connections and verify device identity.
What error detection method is used by 802.11an MAC?
CRC (Cyclic Redundancy Check) is used to detect corrupted frames.
How does MAC handle frame prioritization?
By using Traffic Identifier (TID) values and access categories to support differentiated services.
What enhancements does 802.11an MAC add over 802.11a?
Support for 40 MHz channels, MIMO-related MAC features, and improved QoS and power saving mechanisms.
How does MAC coordinate with the physical layer in 802.11an?
It manages timing, frame formats, and rate adaptation in sync with the PHY layer.
Are security functions part of the 802.11an MAC?
Yes, it supports encryption and authentication protocols such as WPA2.
How does MAC handle roaming between access points?
It facilitates fast handoff by managing reassociation and context transfer frames.
What is the role of Block Acknowledgment in 802.11an MAC?
It allows acknowledgment of multiple frames with a single response, increasing throughput.
How does MAC handle congestion and collision?
It uses exponential backoff and contention window adjustments to reduce collisions and optimize throughput.
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