Subject: [Capwap] One issue, please discuss: I suggest some change for "11.9.18. IEEE 802.11 Tx Power"

From: zhaoyujin 31390 <[email-masked]>
Date: Tue, 26 Sep 2006 08:47:37 +0500

Section 11.9.18 has following discripiton, I suggestion some change 

   From "Current Tx Power:  This attribute contains the transmit output power in mW." 
   to   "Current Tx Power:  This attribute contains the transmit output power in 0.1mW."

The reason is: normally WLAN will use dbm. The conversion between dbm and mw can not satisfy this TLV requirement. If capwap transimit one mw value, the device can't precise get corresponding dbm.

  For example 
         1 dbm<----->1.3mw  ----> 1mw
         2 dbm<----->1.6mw  ----> 2mw
         3 dbm<----->2.0mw  ----> 2mw

  This time, if capwap transmits 2 mw, system doesn't know it is 2dbm or 3 dbm.

The following is suggestion:
  For example 
         1 dbm<----->1.3mw  ----> 13mw
         2 dbm<----->1.6mw  ----> 16mw
         3 dbm<----->2.0mw  ----> 20mw

Thanks
Michael

>   The Tx power message element value is bi-directional.  When sent by
>   the WTP, it contains the current power level of the radio in
>   question.  When sent by the AC, it contains the power level the WTP
>   MUST adhere to.
>
>        0                   1                   2                   3
>        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>       |    Radio ID   |    Reserved   |        Current Tx Power       |
>       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
>   Type:  1041 for IEEE 802.11 Tx Power
>
>   Length:  4
>
>   Radio ID:  An 8-bit value representing the radio to configure.
>
>   Reserved:  MUST be set to zero
>
>   Current Tx Power:  This attribute contains the transmit output power
>      in mW.

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