Method for terminal performing cell reselection procedure, and device supporting same
Disclosed are a method for a terminal not supporting frequency priority-based cell reselection performing a cell reselection procedure in a wireless communication system, and a device supporting same. The method comprises the steps of: determining whether an MBMS service of interest is being provided on a serving cell by a neighboring cell; when it is determined that the MBMS service of interest is being provided by the neighboring cell, measuring the quality of a frequency of interest on which the MBMS service of interest is being provided; and performing a cell reselection procedure for the neighboring cell on the basis of the measured quality.
1. A method performed by a wireless device in a wireless communication system, the method comprising:
measuring a quality of a serving cell to obtain a serving cell quality;
performing a frequency measurement on a frequency on which a multimedia broadcast multicast service (MBMS) service of interest is provided, based on the serving cell quality being equal to or greater than a threshold value;
performing a cell reselection to a neighbor cell on the frequency based on a result of the frequency measurement; and
receiving the MBMS service of interest from the neighbor cell.
2. The method of claim 1 , wherein the wireless device is a narrowband-internet of things (NB-IoT) terminal or a terminal in an extended coverage (EC).
3. The method of claim 1 , wherein the frequency on which the MBMS service of interest is provided comprises at least one of:
an intra-frequency having a central frequency that is equal to a central frequency of a serving frequency on which the serving cell exists; or
an inter-frequency having a central frequency that is different from the central frequency of the serving frequency.
4. The method of claim 1 , further comprising:
receiving information on the neighboring cell from which the MBMS service of interest is received through a system information block 15 (SIB 15 ).
5. The method of claim 1 , further comprising:
receiving information on the neighboring cell from which the MBMS service of interest is received through a single-cell multicast control channel (SC-MCCH).
6. The method of claim 1 , wherein the MBMS service of interest is received through a single cell point to multi point (SC-PTM) transmission or a multicast broadcast single frequency network (MBSFN) transmission.
7. The method of claim 1 , wherein the frequency measurement on the frequency on which the MBMS service is provided is performed while the serving cell quality is equal to or greater than the threshold value, based on the wireless device being interested in receiving the MBMS service.
8. The method of claim 1 , wherein, based on the wireless device not being interested in receiving the MBMS service, a frequency measurement on one or more frequencies is not performed while the serving cell quality is equal to or greater than the threshold value and is performed while the serving cell quality is lower than the threshold value.
9. A wireless device configured to operate in a wireless communication system, the wireless device comprising:
a memory;
a transceiver; and
at least one processor operatively coupled to the memory and the transceiver,
wherein the at least one processor is configured to:
measure a quality of a serving cell to obtain a serving cell quality,
perform a frequency measurement on a frequency on which a multimedia broadcast multicast service (MBMS) service of interest is provided based on the serving cell quality being equal to or greater than a threshold value,
perform a cell reselection to a neighbor cell on the frequency based on a result of the frequency measurement, and
control the transceiver to receive the MBMS service of interest from the neighbor cell.
10. The wireless device of claim 9 , wherein the wireless device is a narrowband-internet of things (NB-IoT) terminal or a terminal in an extended coverage (EC).
11. The wireless device of claim 9 , wherein the frequency on which the MBMS service of interest is provided comprises at least one of:
an intra-frequency having a central frequency that is equal to a central frequency of a serving frequency on which the serving cell exists; or
an inter-frequency having a central frequency that is different from the central frequency of the serving frequency.
12. The wireless device of claim 9 , wherein the at least one processor is further configured to control the transceiver to receive information on the neighboring cell from which the MBMS service of interest is received through a system information block 15 (SIB 15 ).
13. The wireless device of claim 9 , wherein the at least one processor is further configured to control the transceiver to receive information on the neighboring cell from which the MBMS service of interest is received through a single-cell multicast control channel (SC-MCCH).
14. The wireless device of claim 9 , wherein the MBMS service of interest is received through a single cell point to multi point (SC-PTM) transmission or a multicast broadcast single frequency network (MBSFN) transmission.
15. The wireless device of claim 9 , wherein the frequency measurement on the frequency on which the MBMS service is provided is performed while the serving cell quality is equal to or greater than the threshold value based on the wireless device being interested in receiving the MBMS service.
16. The wireless device of claim 9 , wherein, based on the wireless device not being interested in receiving the MBMS service, a frequency measurement on one or more frequencies is not performed while the serving cell quality is equal to or greater than the threshold value and is performed while the serving cell quality is lower than the threshold value.