By referring to Voice over Wireless LAN 4.1 Design Guide RF design chapter, the recommended power level cell boundary for IP phone is -67 dBm => 43 feet client radius. And with 20% cell overlap, the distance between non-overlapped channel's AP is 59 feet for -67 dBm boundary. My questions are:
1. I have two APs of AIR-LAP1242AG, one WLC 2106 and one client-side WIFI cardbus adapter with 17 dBm maximum transmit power. How can I configure in WLC web interface to get the aforementioned result? Set tx power level assignment to level 5 and antenna gain to 4x0.5 dB to get 2 dB?
2. What is the formula/other parameters to calculate for 43 feet client radius and -67 dBm cell boundary? Or the value is obtained through site survey?
3. For ideal VoWLAN, IP phone should roam and associate to another AP at -67 dBm boundary => 43 feet client radius?
4. What would be the ideal dBm of the new AP for IP phone to roam/associate to? This should be the cross point between the new AP and current AP at 43 feet boundary I guess.
Please advise. Thanks.