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Difficulty: MediumWireless Network Deployment and Standards

A network administrator is deploying multiple access points (APs) in a high-density conference hall to support hundreds of concurrent wireless clients. During post-installation testing, users experience intermittent connectivity and severe performance degradation due to high co-channel interference (CCI). Which configuration change should the administrator make to reduce co-channel interference while maintaining continuous coverage?

  1. A
    Increase the transmit power on all access points to maximum levels so client devices can maintain a stronger RSSI throughout the hall.
  2. Reduce access point transmit power levels and assign distinct non-overlapping channels to adjacent access points.Answer
  3. C
    Configure adjacent access points in the 2.4 GHz band to use channels 1, 3, 5, and 7 to evenly distribute signal bandwidth.
  4. D
    Enable 160 MHz channel bonding on all 5 GHz access points to increase available throughput across the hall.

Answer

Reduce access point transmit power levels and assign distinct non-overlapping channels to adjacent access points.
Reducing access point transmit power shrinks individual RF cell sizes (micro-cell deployment), allowing dense placement of access points without excessive coverage overlap. Combining reduced power with a channel plan that assigns non-overlapping channels to neighboring APs eliminates co-channel contention while supporting high client density.

Step-by-Step Solution

1
Identify the cause of performance degradation in a high-density deployment.
High co-channel interference (CCI) occurs when multiple access points operating on the same frequency channel can hear each other's transmissions.
When access points share a channel and overlap in coverage, clients and APs must wait for the shared medium to become free before transmitting.
2
Determine the optimal radio frequency tuning method for high AP density.
Decreasing AP transmit power shrinks cell boundaries, while assigning distinct non-overlapping channels eliminates frequency contention between adjacent cells.
Creating smaller micro-cells allows more APs to be placed in a physical area without their coverage areas bleeding into adjacent APs running on the same channel.

Key Concept

Wireless Cell Sizing and Co-Channel Interference Mitigation
Estimated Time:1m 15s
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Topics

Wireless Network Deployment and Standards

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