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Difficulty: MediumWireless Network Deployment and Standards

A network administrator is configuring a 2.4 GHz wireless network deployment for a single-floor medical clinic featuring four access points arranged in a square grid formation. To minimize interference between adjacent wireless cells, which channel assignment strategy should the administrator implement?

  1. Assign the access points to channels 1, 6, 11, and reuse channel 1 on the access point located diagonally farthest from the first channel 1 access point.Answer
  2. B
    Assign the access points to channels 1, 3, 6, and 9 to evenly spread out the numerical channel values across the available frequency spectrum.
  3. C
    Assign all four access points to channel 6 while setting transmit power to maximum to enforce a unified channel architecture.
  4. D
    Assign the access points to channels 2, 5, 8, and 11 to maintain a consistent three-channel spacing interval between access point cells.

Answer

Assign the access points using non-overlapping channels 1, 6, and 11, while reusing channel 1 on the access point located diagonally farthest from the original channel 1 deployment.
In the 2.4 GHz spectrum, 20 MHz wide channels require a 5-channel separation to avoid overlapping. Channels 1, 6, and 11 are the primary non-overlapping channels. When deploying four access points, assigning channels 1, 6, and 11 to three APs and placing the reused channel 1 on the diagonally opposite AP maximizes physical distance, suppressing co-channel interference while eliminating adjacent-channel interference.

Step-by-Step Solution

1
Identify the frequency band and channel availability.
The 2.4 GHz Wi-Fi spectrum (802.11b/g/n) consists of 11 channels in North America, each spaced 5 MHz apart with a 20 MHz or 22 MHz channel width.
Because channels overlap if separated by less than 5 channel numbers, only channels 1, 6, and 11 provide zero spectral overlap.
2
Evaluate the grid topology for access point channel allocation.
With four access points in a 2x2 square grid, three non-overlapping channels (1, 6, 11) can be assigned to three adjacent APs.
The fourth AP must reuse one of the three non-overlapping channels.
3
Determine the optimal channel reuse placement.
Reusing channel 1 on the diagonally opposite access point maximizes the physical separation distance between identical channels.
Physical separation mitigates co-channel interference (CCI) while completely preventing adjacent-channel interference (ACI).

Key Concept

2.4 GHz Non-Overlapping Channel Selection and Co-Channel Interference Mitigation
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Topics

Wireless Network Deployment and Standards

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