Method for handling frequency priority based on terminal supporting characteristics in wireless communication system and apparatus for supporting same
Provided in one aspect is a method for handling a frequency priority performed by a terminal in a wireless communication system. The method comprises: receiving minimum priority application request information from a network; and handling a frequency priority for cell reselection on the basis of the minimum priority application request information and the supporting characteristics of the terminal. The minimum priority application request information indicates an application of the minimum priority to a current frequency of the terminal or all frequencies of current radio access technology (RAT) of a cell which the terminal camps on. The supporting characteristic of the terminal is whether the terminal supports the RAT other than the current RAT. The handling of the frequency priority is a variable application of the frequency priority for the cell reselection according to the contents of the minimum priority application request information and the supporting characteristics of the terminal.
1. A method for handling a frequency priority by a user equipment (UE) in a wireless communication system, the method comprising:
determining whether or not the UE supports non-long term evolution (LTE) which is a radio access technology (RAT) other than LTE;
transmitting, to a first cell on a first LTE frequency, a radio resource control (RRC) connection configuration request including UE supporting characteristics information, wherein the UE supporting characteristics information indicates whether or not the UE supports non-LTE;
receiving, from the first cell, a RRC connection rejection including lowest priority application request information in response to the UE supporting characteristics information, wherein the lowest priority application request information indicates a frequency to apply a lowest priority;
applying the lowest priority to the frequency indicated by the lowest priority application request information; and
reselecting a second cell on a second LTE frequency or a third cell on a non-LTE frequency based on the applied lowest priority,
wherein
if the UE does not support non-LTE, the lowest priority application request information indicates to apply the lowest priority to the first LTE frequency and the UE reselects the second cell on the second LTE frequency other than the first LTE frequency, and
if the UE supports non-LTE, the lowest priority application request information indicates to apply the lowest priority to all LTE frequencies, which include the first LTE frequency and the second LTE frequency, and the UE reselects the third cell on the non-LTE frequency.
2. The method of claim 1 , further comprising receiving information indicating whether to allow transmission of the UE supporting characteristics information, and
the UE supporting characteristics information is transmitted when the transmission is allowed.
3. A user equipment (UE), the UE comprises:
a Radio Frequency (RF) unit that sends and receives radio signals; and
a processor, functionally coupled to the RF unit, that:
determines whether or not the UE supports non-long term evolution (LTE) which is a radio access technology (RAT) other than LTE,
controls the RF unit to transmit, to a first cell on a first LTE frequency, a radio resource control (RRC) connection configuration request including UE supporting characteristics information, wherein the UE supporting characteristics information indicates whether or not the UE supports non-LTE,
controls the RF unit to receive, from the first cell, a RRC connection rejection including lowest priority application request information in response to the UE supporting characteristics information, wherein the lowest priority application request information indicates a frequency to apply a lowest priority,
applies the lowest priority to the frequency indicated by the lowest priority application request information, and
reselects a second cell on a second LTE frequency or a third cell on a non-LTE frequency based on the applied lowest priority,
wherein if the UE does not support non-LTE, the lowest priority application request information indicates to apply the lowest priority to the first LTE frequency and the UE reselects the second cell on the second LTE frequency other than the first LTE frequency, and
if the UE supports non-LTE, the lowest priority application request information indicates to apply the lowest priority to all LTE frequencies, which include the first LTE frequency and the second LTE frequency, and the UE reselects the third cell on the non-LTE frequency.
4. The UE of claim 3 , wherein the UE supporting characteristics information is a flag type.
5. The UE of claim 3 , wherein UE supporting characteristics information includes a list of RAT which the UE supports.
6. The method of claim 1 , wherein the UE supporting characteristics information is a flag type.
7. The method of claim 1 , wherein UE supporting characteristics information includes a list of RAT which the UE supports.