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  1. #1
    Regular Contributor
    Join Date
    Mar 2008
    Posts
    107

    WLAN and GSM Strenght value

    Hello,

    I need to know what are the meassures for WLAN and GSM strength values in the following situations:

    1. For WLAN I am using smth like this:
    Code:
    CWlanScanInfo *iScanInfo;
    //init iScanInfo, etc...
    TInt8 rxLevel = iScanInfo->RXLevel();
    ...
    I get different numbers for rxLevel, usually between 80 and 99.
    What does this value represent? I have no idea how to use this information. In the header file it says only this:
    Code:
            /**
            * Return RX level of the BSS.
            * @return RX level.
            */
            virtual TUint8 RXLevel() const = 0;
    2. For GSM strenght value I am using CTelephony like this:
    Code:
    CTelephony* iTelephony;
    CTelephony::TSignalStrengthV1 iGSMPwr;   //For signal strength
    CTelephony::TSignalStrengthV1Pckg iGSMPwrPkg;
    //init everything, etc...
    iTelephony->GetSignalStrength(iStatus, iGSMPwrPkg);
    //signal value is in iGSMPwr.iSignalStrength
    ...
    The information on the header file is also very poor:
    Code:
    class TSignalStrengthV1 : public TEtelISVType
    	/**
    	Defines the phone's current signal strength.
    	*/
    		{
    	public:
    		IMPORT_C TSignalStrengthV1();
    	public:
    		/**
    		The value of signal strength.
    		*/
    		TInt32 iSignalStrength;
    		/**
    		The absolute number of signal "bars" that the phone should display.
    		*/
    		TInt8 iBar;
    		};
    Again I don't know what to do with the iSignalStrength value, how to interpret it. I've only noticed that for a big value (eg. 99) I have only 1 iBar as for a smaller value (eg. 88) I have maximum nr. of bars (7).

    I can assume it is a dB value (smth like 200(lgV / V)) but I am not sure, normally it should be expressed like P = 10lg(P1/P0), where P1 is the actual strength and P0 is a reference strength so if we know P0 we can compute P1 from P.

    Please help on this.

    Thanks,
    Omar

  2. #2
    Regular Contributor
    Join Date
    Mar 2008
    Posts
    107

    Re: WLAN and GSM Strenght value

    After a few comments, I think the value is a dBm value expressed in negative.

    Read here:
    http://en.wikipedia.org/wiki/DBm
    -70 dBm = 100 pW Typical range (−60 to −80 dBm) of wireless (802.11x) received signal power over a network

    So if you get x = 70 it means -70dBm.

    To get actual power -> P = 10^(-x/10)W.

    Maybe I'm wrong... I wait for replies

    Omar

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