Method for executing paging sequence in wireless communication system, and device for same
In a wireless communication system according to an embodiment of the present invention, in which MME and eNB are unsynchronized, a method for the MME to transmit a paging message to a terminal may comprise: a step for transmitting to the eNB, support information which includes an identifier for the terminal and an eDRX cycle; a step for receiving from the eNB, a Paging Info Response message as a response to the support information, wherein the Paging Info Response message includes the time remaining until the next paging of the terminal, such time being calculated based on the support information; and a step for setting the remaining time as an initial eDRX timer value, and transmitting the paging message to the eNB when the eDRX timer expires.
1. A method for a mobility management entity (MME) to transmit a paging message to a user equipment (UE) in a hyper (H)-system frame number (SFN) non-synchronization situation in which H-SFN starting occasions of the MME and an evolved_nodeB (eNB) have been spaced at a preset range or more in a wireless communication system, the method comprising:
transmitting, to the eNB, assistance information comprising an identifier of the UE and an extended discontinuous reception (eDRX) cycle;
receiving, from the eNB, a paging information response message as a response to the assistance information, wherein the paging information response message comprises a remaining time up to a next paging occasion of the UE calculated based on the assistance information; and
setting the remaining time as an eDRX timer initial value and transmitting the paging message to the eNB when the eDRX timer expires,
wherein the paging information response message further comprises a paging synchronization gap value which is a maximum error value between paging occasions of eNBs at which a paging occasion of the eNB is capable of being considered to have been synchronized with paging occasions of other eNBs.
2. The method of claim 1 , wherein, when the remaining time and the paging synchronization gap value are received through the paging information response message, the transmitting the paging message to the eNB includes of setting the eDRX timer initial value by taking into consideration the remaining time and the paging synchronization gap value and transmitting the paging message to the eNB when the eDRX timer expires.
3. The method of claim 1 , wherein the assistance information is included in an attach accept message within an attach procedure or a tracking area update (TAU) accept message within a TAU procedure and transmitted to the eNB.
4. The method of claim 3 , wherein the assistance information is included in an information element (IE) of an S1AP message used to transmit the attach accept message or the TAU accept message and transmitted to the eNB.
5. The method of claim 1 , wherein the assistance information is included in a paging information request message and transmitted to the eNB.
6. The method of claim 1 , further comprising:
resetting the eDRX timer as the eDRX cycle when the eDRX timer set as the eDRX timer initial value expires.