Abstract: Provided is peer-to-peer (P2P) communication for a vehicle-to-everything (V2X) service. A V2X apparatus establishes a P2P connection with a peer V2X apparatus on the basis of a V2X ID of the V2X apparatus.

Abstract: Provided is a device establishing a security session for a vehicle-to-everything (V2X) service. The device transmits a ping request message requesting establishment of the security session to a V2X server. The ping request message includes a certificate based on the Institute of Electrical and Electronics Engineers (IEEE) 1609.2 and a session identifier (ID) for the security session. The device receives, from the V2X server, a ping response message as a response to the ping request message.

Abstract: The present invention relates to a radio access system, and more particularly, to a method for efficiently performing handover in circumstances in which two networks use different communication methods, and to an apparatus using the method.

Abstract: The present invention relates to a radio access system, and more particularly, to a method for efficiently performing handover in circumstances in which two networks use different communication methods, and to an apparatus using the method.

Abstract: A method for performing handover in a first type of cell by a terminal supporting an inter-radio access technology (interRAT) handover includes the steps of searching for cells of a second type that are operating in accordance with a communication type different from that of the first type of cell; receiving a minimal reception signal quality value and signal quality offset information from a second type of base station which is found in the step of searching for cells of the second type; determining whether or not the found second type of base station is available for service based on a signal quality measurement value, a power compensation value, and the minimal reception signal quality value and signal quality offset information of the found second type of base station; and performing handover to the second type of base station when the latter is determined to be available for service.

Abstract: The present invention relates to a wireless access system, and more specifically to a method for efficiently performing a cell reselection and an apparatus for performing the same when a terminal fails in a random access. The method for enabling user equipment to reselect cells in the wireless access system according to one embodiment of the present invention, comprises the steps of: starting a random access procedure for a first cell selected according to a first condition; and performing a cell reselection procedure according to a second condition if the random access procedure is not successfully completed before a timer set from the starting step expires.

Abstract: The present invention relates to a wireless access system, and more specifically to a method for efficiently performing a cell reselection and an apparatus for performing the same when a terminal fails in a random access. The method for enabling user equipment to reselect cells in the wireless access system according to one embodiment of the present invention, comprises the steps of: starting a random access procedure for a first cell selected according to a first condition; and performing a cell reselection procedure according to a second condition if the random access procedure is not successfully completed before a timer set from the starting step expires.

Abstract: A method for performing handover in a first type of cell by a terminal supporting an inter-radio access technology (interRAT) handover includes the steps of searching for cells of a second type that are operating in accordance with a communication type different from that of the first type of cell; receiving a minimal reception signal quality value and signal quality offset information from a second type of base station which is found in the step of searching for cells of the second type; determining whether or not the found second type of base station is available for service based on a signal quality measurement value, a power compensation value, and the minimal reception signal quality value and signal quality offset information of the found second type of base station; and performing handover to the second type of base station when the latter is determined to be available for service.