TSignalLevelParams params = { 8e6, 8e6, 80, 40 };

  CMyClass::ConstructL()
      {
      iSignalLevelHandler = CVccWlanSignalLevelHandler::NewL( *this, params );
      iSignalLevelHandler->StartL();
      }

  CMyClass::StopMonitoring()
      {
      iSignalLevelHandler->Stop();
      }

  CMyClass::SetNewParametersAndStartL()
      {
      TSignalLevelParams params = { 8e6, 10e6, 80, 20 };

      iSignalLevelHandler->SetParams( params );

      // Start using new parameters
      iSignalLevelHandler->StartL();
      }

  CMyClass::~CMyClass()
      {
      delete iSignalLevelHandler;
      }


  CMyClass::WlanSignalChanged(
      TInt32 aRss,
      TSignalRssClass aRssClass )
      {
      // Signal level changed. Must do something
      if ( aRssClass == ESignalClassWeak )
          {
          // Do handover if the signal is very weak
          if ( aRss > EReallyBadSignalLevel )
              {
              }
          }
      }

Since

S60 v3.2