TPC - Can it increase power levels? Or Not?

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Jul 9th, 2008
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Hello all,


so as the Cisco RRM document states :


"The TPC algorithm is only responsible for turning power levels down"


but on the calculation criteria, it says "If Tx power needs to be increased: TPC hysteresis of 3dBm must be met"



http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a008072c759.shtml#tpca










I have asked a similar question on TPC before:


http://forums.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Wireless%20-%20Mobility&topic=WLAN%20Radio%20Standards&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40%40.2cc0c73a


But I am still a little confused.


Many thx indeed,

Ken

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kfarrington Wed, 07/09/2008 - 10:08
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Hi Guys,


Couple of more points here.


1. Can I say that TPC is to reduce power only within the RF domain based on the -65 default value and to stop RF-bleed.


2. Can I say that the Coverage Hole Algorithm function is the only way that APs would increase the TX power if they see a client for "x" amount of time with an SNR below the configured threshold?


3. Is it not a risk, to have coverage hole detection, as a "client" could increase your infrastructure RF bleed and this could be a client not even associated to your network? I would understand if an AP went down, to cover the covergae hole, but a client with a bad signal, that can change the dynamics of your network ???????


4. Can you disable Coverage Hole Algorithm on the WLC?


I suppose the main way of looking at this (and correct me if I am wrong) is TPC is there to stop RF bleed (correct) and Coverage Hole Algorithms are there to increase range of RF signal (Correct?)



Many thx guys, - Need a beer!

Ken

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