Base station control method for connection of terminal with higher priority and base station supporting the same

A base station comprising:

• a radio frequency module;
• and
• a processor connected with the radio frequency module, and providing service to a first terminal and a second terminal having higher priority than the first terminal,
• wherein if it is determined that there is an influx of call connection attempts when the first terminal and the second terminal perform initial ranging the processor sets a initial ranging backoff window size included in an information element of S-SFH SP3 (Secondary-Superframe Header SubPacket3) to a first size and a initial ranging backoff window size for the second terminal in an AAI-SCD (Advanced Air Interface-System Configuration Descriptor) message to a second size.

A method in which a second terminal having higher priority than a first terminal, among sub-terminals of a base station, is connected to the base station, the method comprising:

• performing initial ranging with the base station;
• receiving from the base station an AAI-SCD (Advanced Air Interface-System Configuration Descriptor) message including a first initial ranging backoff window size, which is smaller than a initial ranging backoff window size for the first terminal;
• and
• performing initial ranging again with the base station by using the first initial ranging backoff window size.