Method and device for controlling multipriority in wireless communication system
The present invention relates to a wireless communication system and, more specifically, to a method and a device for controlling a backoff timer on the basis of multipriority in a wireless communication system. The method for controlling a backoff timer in a terminal in which multipriority is set, according to one embodiment of the present invention, comprises the steps of: transmitting, to a network node, a non access stratum (NAS) request message which is set to a first priority level and does not have an access point name (APN); receiving a reject message for the NAS request message from the network node; and starting a session management (SM) backoff timer on the basis of the rejection message, wherein while the SM backoff timer is operated, the terminal is permitted to transmit a new NAS request message which is not set to the first priority level.
1. A method of controlling a backoff timer at a user equipment (UE) configured for multipriority, the method comprising:
transmitting a first non access stratum (NAS) request message without an access point name (APN), which is set to a first priority level, to a network node, wherein the first NAS request message without the APN is an attach request message transmitted along with a packet data network (PDN) connectivity request without an APN;
receiving a reject message for the first NAS request message from the network node;
initiating a session management (SM) backoff timer based on the reject message; and
transmitting a second NAS request message, which is not set to the first priority level, while the SM backoff timer is running.
2. The method according to claim 1 , wherein the UE does not provide the APN during a procedure initiated by transmitting the first NAS request message without the APN.
3. The method according to claim 2 , wherein the procedure initiated by transmitting the first NAS request message without the APN is an attach procedure.
4. The method according to claim 1 , wherein the reject message includes a value for the SM backoff timer which is running while the second NAS request message is transmitted.
5. The method according to claim 1 , wherein a clause in the reject message is set to insufficient resources.
6. The method according to claim 1 , wherein the UE configured for multipriority is a UE configured for dual priority.
7. The method according to claim 6 , wherein the first priority level corresponds to the UE being configured for NAS signaling low priority.
8. The method according to claim 6 , wherein the first priority level corresponds to a low priority indicator, which is set to the UE being configured for NAS signaling low priority.
9. The method according to claim 1 , wherein the UE is a machine type communication (MTC) device.
10. A user equipment (UE) device for controlling a backoff timer if multipriority is set, the UE comprising:
a transceiver module; and
a processor,
wherein the processor configured to:
transmit a first non access stratum (NAS) request message without an access point name (APN), which is set to a first priority level, to a network node using the transceiver module, wherein the first NAS request message without the APN is an attach request message transmitted along with a packet data network (PDN) connectivity request without an APN,
receive a reject message for the first NAS request message from the network node using the transceiver module,
initiate a session management (SM) backoff timer based on the reject message, and
transmit a second NAS request message, which is not set to the first priority level, while the SM backoff timer is running.