diff --git a/platform/cooja/dev/radio-arch.c b/platform/cooja/dev/radio-arch.c
index 1e9d6653b..6c0256a8d 100644
--- a/platform/cooja/dev/radio-arch.c
+++ b/platform/cooja/dev/radio-arch.c
@@ -26,7 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $Id: radio-arch.c,v 1.9 2006/10/11 09:06:41 fros4943 Exp $
+ * $Id: radio-arch.c,v 1.10 2006/10/11 15:14:56 fros4943 Exp $
  */
 
 #include "dev/radio-arch.h"
@@ -61,7 +61,14 @@ int simOutSize;
 char simRadioHWOn = 1;
 int simSignalStrength = -200;
 char simPower = 100;
+int simRadioChannel = 1;
 
+/*-----------------------------------------------------------------------------------*/
+void
+radio_set_channel(int channel)
+{
+  simRadioChannel = channel;
+}
 /*-----------------------------------------------------------------------------------*/
 int
 radio_sstrength(void)
diff --git a/tools/cooja/java/se/sics/cooja/contikimote/interfaces/ContikiRadio.java b/tools/cooja/java/se/sics/cooja/contikimote/interfaces/ContikiRadio.java
index c821a5237..30f2f9c77 100644
--- a/tools/cooja/java/se/sics/cooja/contikimote/interfaces/ContikiRadio.java
+++ b/tools/cooja/java/se/sics/cooja/contikimote/interfaces/ContikiRadio.java
@@ -26,7 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $Id: ContikiRadio.java,v 1.8 2006/10/09 13:41:57 fros4943 Exp $
+ * $Id: ContikiRadio.java,v 1.9 2006/10/11 15:14:30 fros4943 Exp $
  */
 
 package se.sics.cooja.contikimote.interfaces;
@@ -64,6 +64,7 @@ import se.sics.cooja.interfaces.Radio;
  * <li>char simRadioHWOn (radio hardware status (on/off))
  * <li>int simSignalStrength (heard radio signal strength)
  * <li>char simPower (number indicating power output)
+ * <li>int simRadioChannel
  * </ul>
  * <p>
  * Dependency core interfaces are:
@@ -160,6 +161,10 @@ public class ContikiRadio extends Radio implements ContikiMoteInterface {
     
     return myMoteMemory.getIntValueOf("simInSize") != 0;
   }
+
+  public int getChannel() {
+    return myMoteMemory.getIntValueOf("simRadioChannel");
+  }
   
   public RadioEvent getLastEvent() {
     return lastEvent;
diff --git a/tools/cooja/java/se/sics/cooja/interfaces/Radio.java b/tools/cooja/java/se/sics/cooja/interfaces/Radio.java
index 7582163a6..a4072d80e 100644
--- a/tools/cooja/java/se/sics/cooja/interfaces/Radio.java
+++ b/tools/cooja/java/se/sics/cooja/interfaces/Radio.java
@@ -24,7 +24,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  * 
- * $Id: Radio.java,v 1.4 2006/10/05 14:47:48 fros4943 Exp $
+ * $Id: Radio.java,v 1.5 2006/10/11 15:13:57 fros4943 Exp $
  */
 
 package se.sics.cooja.interfaces;
@@ -145,4 +145,11 @@ public abstract class Radio extends MoteInterface {
    */
   public abstract void setCurrentSignalStrength(double signalStrength);
 
+  /**
+   * Returns the current radio channel number.
+   * 
+   * @return Current channel number
+   */
+  public abstract int getChannel();
+  
 }
diff --git a/tools/cooja/java/se/sics/cooja/radiomediums/StandardRadioMedium.java b/tools/cooja/java/se/sics/cooja/radiomediums/StandardRadioMedium.java
index 667dbc9e7..42f976a70 100644
--- a/tools/cooja/java/se/sics/cooja/radiomediums/StandardRadioMedium.java
+++ b/tools/cooja/java/se/sics/cooja/radiomediums/StandardRadioMedium.java
@@ -26,7 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $Id: StandardRadioMedium.java,v 1.7 2006/10/09 14:15:29 fros4943 Exp $
+ * $Id: StandardRadioMedium.java,v 1.8 2006/10/11 15:14:10 fros4943 Exp $
  */
 
 package se.sics.cooja.radiomediums;
@@ -394,7 +394,8 @@ public class StandardRadioMedium extends RadioMedium {
                 * (0.01 * (double) sendingRadio
                     .getCurrentOutputPowerIndicator());
 
-            if (distance <= moteTransmissionRange) {
+            if (distance <= moteTransmissionRange
+                && sendingRadio.getChannel() == listeningRadio.getChannel()) {
               newConnection.addDestination(registeredRadios.get(listenNr),
                   registeredPositions.get(listenNr), dataToSend);
 
@@ -410,7 +411,8 @@ public class StandardRadioMedium extends RadioMedium {
                     .getTransmissionEndTime());
                 listeningRadio.setCurrentSignalStrength(SS_OK);
               }
-            } else if (distance <= moteInterferenceRange) {
+            } else if (distance <= moteInterferenceRange
+                && sendingRadio.getChannel() == listeningRadio.getChannel()) {
               // If close enough to sabotage other transmissions..
               listeningRadio.interferReception(sendingRadio
                   .getTransmissionEndTime());