Chapter 6; Topic 4

TPC and the Third Strongest NDP Message

The TPC selects the AP that has received the third strongest NDP message. The Sisco has designed TPC to choose the neighbor that received the third strongest RSSI from an AP as a criterion. The third strongest RSSI should be 70dBm, with the NDP advertisement messages transmitted at the maximum transmit power level. Since the neighbor list of AP-5 has the strongest RSSI record for AP-1, it is used to determine how far AP-1 can reach other AP cells. It is essential always to remember that the maximum transmits power a single AP can use depends on the current bandwidth it actively operates in. The regulatory domain determines the maximum number that can be used.

TPC and the Third Strongest NDP Message; Internet source

https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-1/mobility_express/b_RRM_White_Paper.pdfThe Transmit Power Control, TPC refers to the third neighbor opinion of the NDP. It can also be described as the basis for calculation as in TPCv2. We have the TPCv1, TPCv2, and the TPC min/max. The TPCv1 is known as the optimal coverage mode and is the default method for power control in RRM. It calculates Tx power on a per AP per radio basis for every member of the RF group because the algorithm runs on the RF group. In the case of TPCv1, the Third loudest TX neighbor is used because this is the number of non-overlapping channels available for 2.4 GHz