Configuring Clear Channel Assessment Thresholds to Prevent Wi-Fi Throughput Collapse
Configure CCA thresholds 6 dB above adjacent cell beacon power while enforcing transmit power control to prevent co-channel frame deferral and packet collapse.
Frame Retransmission Rate
Meaning
Packet delivery measurements track the percentage of data units that must be sent more than once. A high frame retransmission rate usually indicates poor signal quality or heavy interference within the local radio environment. This metric is a primary indicator of link health because it accounts for the overhead created by the layer two protocols.
Error Frequency
Collisions and noise bursts cause individual frames to arrive with corrupted bits. When the receiver detects an invalid checksum, it does not send an acknowledgment, forcing the transmitter to increment its frame retransmission rate and try again. This cycle repeats until the packet is either delivered or the retry limit is exceeded.
Link Stability
Consistent performance relies on keeping the number of repeated attempts as low as possible. A spiking frame retransmission rate often precedes a total disconnection as the radio struggles to find a clear window for communication. Engineers monitor this trend to determine if the modulation settings are too aggressive for the current distance.
Bandwidth Penalty
Efficiency drops because the same data occupies the airtime multiple times without increasing the net throughput. Each repeated packet in the frame retransmission rate consumes energy and prevents other devices from using the channel. This wasted capacity can lead to a significant reduction in the maximum data rate available to the entire network.