A mechanism to permit an LMA to perform some specific handling once MAG restart is detected is disclosed. If a MAG restart is detected by the LMA, the LMA preferably will not release all corresponding binding in its cache. The LMA may select an alternative MAG which is servicing the same. Then the LMA can send a mobility message to the selected MAG. The mobility message can be triggered by the restart detection or by the received downlink data on one or more valid binding. The mobility message can contains all UE identity that has a valid binding in the LMA and the restarted MAG.