Patent ID: 8588792

Claim:
A method for reducing call initiation collisions in a wireless communication system, the method comprising: receiving, at a user equipment (UE), a broadcast notification message from an eNodeB, the broadcast notification message comprising information regarding an action type corresponding to each of a plurality of predetermined ranges, the action type is related to sending a call initiation request, wherein the action type information comprises a first action type instructing sending the call initiation request to the eNodeB, a second action type indicating waiting a predetermined time duration for sending the call initiation request to the eNodeB, and a third action type indicating an action of changing a frequency for the sending the call initiation request, selecting, at the UE, a value randomly in a range of 0 to 1; and performing an operation according to the action type corresponding to each of the plurality of predetermined ranges based upon the selected value in the range of 0 to 1 and the broadcast notification message, wherein the UE sends the call initiation request to the eNodeB according to the first action type if the selected value in the range of 0 to 1 is smaller than a first threshold value, wherein the UE waits a predetermined time duration for sending the call initiation request to the eNodeB according to the second action type if the selected value in the range of 0 to 1 is equal to or more than the first threshold value and smaller than a second threshold value, wherein the UE changes a frequency for the sending the call initiation request according to the third action type if the selected value in the range of 0 to 1 is equal to or more than the second threshold value and smaller than or equal to 1, and wherein the broadcast notification message is received while the UE is in a radio resource control (RRC) IDLE mode and prior to the UE operation in a RRC CONNECTED mode.