A method and apparatus for transmittng an warning message by using v2x servics in a wireless access system

A vehicle user equipment (VUE) for transmitting a warning message in a wireless access system supporting a Vehicle to Everything (V2X) service, the VUE comprising:

• a receiver;
• a transmitter;
• and
• a processor controls the receiver and the transmitter to transmit the warning message,
• wherein the processor is configured to:
• control the receiver to receive a first Message transmission Guideline Package (MGP) message including geographical coordination information related with an MGP area and a value tag indicating time information for updating the MGP message,
• check the value tag is changed or not, and
• control the transmitter to transmit a first warning message based on the first MGP message when the value tag is not expired;
• or
• control the transmitter to transmit a second warning message based on a second MGP message when the value tag is expired,
• wherein at least a transmission frequency or a transmission power for the second warning message are determined base on the second MGP message, and
• wherein the MGP area represents where MGP profiles are the same.