Patent ID: 9301106
Filing Date: 2016-03-29
CPC Classification: H04W

Claim Text:
1. A method for selecting a Group Delegator (GD) in a wireless access system supporting a Machine to Machine (M2M) communication, the method performed by a M2M device and comprising: if the M2M device which is a Group Member (GM) of an M2M group does not receive any information related to a ranging code used for a network reentry from a Base Station (BS), receiving a broadcast message including a second threshold changed from a first threshold used for selecting the GD of the M2M group; generating a random value for selecting the GD; reselecting the GD by comparing the second threshold with the random value, wherein if the second threshold is equal to or larger than the random value, the M2M device is selected as the GD, and if the second threshold is smaller than the random value, the M2M device continues to operate as the GM of the M2M group; starting a timer according to a detection of ranging code transmission from the reselected GD to the BS; and performing a predetermined procedure for the network reentry to the BS after the timer is expired, if a ranging response message in response to the ranging code sent by the reselected GD has not been received by the M2M device.