Patent ID: 9532383
Filing Date: 2016-12-27
CPC Classification: H04W

Claim Text:
1. A method of performing a random access channel (RACH) procedure, by a user equipment (UE), in a wireless communication system, comprising: receiving, by the UE, available uplink radio resource from a base station (BS), wherein the available uplink radio resource comprises a first subset of subframes allocated for a normal random access and a second subset of subframes allocated for a delay tolerant access; determining, by the UE, whether to perform the RACH procedure for the normal random access or the delay tolerant access; selecting, by the UE, at least one subframe, from the first subset of subframes when the UE determines to perform the RACH procedure for the normal random access, or from the second subset of subframes when the UE determines to perform the RACH procedure for the delay tolerant access, transmitting, by the UE, a random access preamble using the at least one selected subframe; and receiving, by the UE, a random access response in response to the transmitted random access preamble, wherein the UE is a Machine Type Communication (MTC) device which performs inter-device communication without user intervention, wherein an overload for the uplink radio resource is detected by using one of an equation for the normal random access and an equation for the delay tolerant access, wherein the equations for the normal random access and the delay tolerant access use a first parameter related to a total energy detected in specific subframes within one cycle and a second parameter related to a number of the specific subframes within one cycle.