Method and apparatus for updating extended access barring information

A method of performing random access based on Extended Access class Barring (EAB) information for a user equipment (UE) in a wireless communication system using a number of orthogonal frequency division multiple (OFDM) symbols, the method performed by the UE and comprising:

• receiving Discontinuous Reception (DRX) information on a DRX cycle and a DRX offset from a base station (BS);
• performing a DRX operation based on the DRX information;
• determining whether the DRX cycle indicated by the DRX information is greater than a DRX cyclic threshold, wherein the DRX cyclic threshold is included in control information received from the BS;
• if the DRX cycle is greater than the DRX cyclic threshold, receiving a system information block (SIB) including the EAB information;
• if the DRX cycle is not greater than the DRX cyclic threshold, receiving a paging message from the BS to determine whether the EAB information has been changed and further receiving the SIB to obtain changed EAB information when the paging message indicates the EAB information has been changed;
• and
• performing an EAB operation based on the changed EAB information.

A method of performing random access based on Extended Access class Barring (EAB) information for a user equipment (UE) in a wireless communication system using a number of orthogonal frequency division multiple (OFDM) symbols, the method performed by the UE and comprising:

• receiving a system information block (SIB) including the EAB information from a base station (BS);
• obtaining information on an extended back-off parameter and a normal back-off parameter;
• determining whether uplink traffic to be transmitted from the UE to the BS is associated with a pre-defined event, wherein the pre-defined event is associated with a surge event;
• if the uplink traffic is associated with the pre-defined event, performing an EAB operation, and determining whether to perform a first type back-off operation based on the extended back-off parameter before transmitting a random access preamble to the BS;
• and
• if the uplink traffic is not associated with the pre-defined event, performing an EAB operation, and determining whether to perform a second type back-off operation based on the normal back-off parameter before transmitting the random access preamble to the BS,
• wherein the extended back-off parameter indicates an upper bound of a back-off time of the first type back-off operation,
• wherein the normal back-off parameter indicates an upper bound of a back-off time of the second type back-off operation.