US 11,240,717 B2 · Method and apparatus for performing cell reselection in wireless communication system

Abstract

The disclosure relates to a pre-5th-Generation (5G) or 5G communication system is provided for supporting higher data rates Beyond 4th-Generation (4G) communication such as Long Term Evolution (LTE). The disclosure provides a method and apparatus for effectively performing cell reselection in a wireless communication system. The disclosure relates to an operation method for a terminal in a wireless communication system, and the method includes determining to initiate a cell reselection in a radio resource control inactive state (RRC_Inactive state), discovering for a first cell that satisfies a first condition and a second condition, among a plurality of neighboring cells, if the first cell is discovered, camping on the first cell, and if the first cell is not discovered, camping on a second cell that satisfies the first condition and does not satisfy the second condition, among the plurality of neighboring cells, wherein the terminal is in the RRC_Inactive state.

Claims22

Dependent claims

A method performed by a terminal in a wireless communication system, the method comprising:

determining to initiate a cell reselection in a radio resource control (RRC) inactive state;
searching for a suitable cell for a normal service, wherein the suitable cell satisfies a first condition associated with a cell quality and a second condition associated with a service provider of a cell;
when the suitable cell is identified, camping on the suitable cell;
when the suitable cell is not identified, camping on an acceptable cell for a limited service in the RRC inactive state and starting a timer, wherein the acceptable cell satisfies the first condition;
and
based on identifying that the terminal performs the limited service on the acceptable cell while the timer is running, changing a state of the terminal from the RRC inactive state to a RRC idle state.

3 more elements

A terminal in a wireless communication system, the terminal comprising:

at least one transceiver;
and
at least one processor configured to:
determine to initiate a cell reselection in a radio resource control (RRC) inactive state;
search for a suitable cell for a normal service, wherein the suitable cell satisfies a first condition associated with a cell quality and a second condition associated with a service provider of a cell;
when the suitable cell is identified, camp on the suitable cell;
when the suitable cell is not identified, camp on an acceptable cell for a limited service in the RRC inactive state and start a timer, wherein the acceptable cell satisfies the first condition;
and
based on identifying that the terminal performs the limited service on the acceptable cell while the timer is running, change a state of the terminal from the RRC inactive state to a RRC idle state.

6 more elements

Dependencies are inferred from the claim text.

Method and apparatus for performing cell reselection in wireless communication system

Life of this patent

Method and apparatus for performing cell reselection in wireless communication system

Life of this patent

Abstract

Claims22