Within EDCA, which category typically has the highest priority for medium access?

Within EDCA, which category typically has the highest priority for medium access?

• A. Background
• B. Voice
• C. Best Effort
• D. Video

Answer: (B)

EDCA assigns traffic to categories with different channel-access parameters to provide QoS. The voice category is given the highest priority because real-time voice traffic is extremely sensitive to delay and jitter. It uses the smallest Arbitration Inter-Frame Space and the smallest minimum contention window, so it competes for the medium more often and gains access faster than other categories. Video has high priority but not as urgent as voice; Best Effort is next, and Background is the lowest. So the voice category typically gets the quickest, most reliable access for medium access.

EDCA assigns traffic to categories with different channel-access parameters to provide QoS. The voice category is given the highest priority because real-time voice traffic is extremely sensitive to delay and jitter. It uses the smallest Arbitration Inter-Frame Space and the smallest minimum contention window, so it competes for the medium more often and gains access faster than other categories. Video has high priority but not as urgent as voice; Best Effort is next, and Background is the lowest. So the voice category typically gets the quickest, most reliable access for medium access.