Method and apparatus for performing communication in mobile communication system

• US 10,917,933 B2
• Filed: 02/22/2019
• Issued: 02/09/2021
• Est. Priority Date: 02/23/2018
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Sangbum, Kim, Soenghun
• Primary Examiner(s): Mui, Gary
• Application Number:
  US16/282,973
• Publication Number:
  US 20190268963A1
• Time in Patent Office: 718 Days
• CPC Class Codes: H04W 36/0005 Control or signalling for completing the hand-off
• CPC Class Codes: H04W 36/0033 with transfer of context information
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/0241 where no transmission is received, e.g. out of range of the transmitter
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: H04W 68/02 Arrangements for increasing efficiency of notification or paging channel
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of performing cell selection, by a terminal, in a wireless communication system is provided. The method includes receiving a control message including configuration information for a radio resource control (RRC) inactive state, entering the RRC inactive state based on the configuration information; performing cell selection, and in response to a suitable cell not being found and an acceptable cell being found in the cell selection, entering a RRC idle state.

Claims

1. A method of performing cell selection, by a terminal, in a wireless communication system, the method comprising:

receiving a control message including configuration information for a radio resource control (RRC) inactive state;

entering the RRC inactive state based on the configuration information;

performing cell selection;

in response to a suitable cell not being found and an acceptable cell being found in the cell selection, entering a RRC idle state; and

camping on the acceptable cell.

2. The method of claim 1, wherein the performing of the cell selection comprises:

performing a cell selection process to find the suitable cell; and

in response to the cell selection process failing to find the suitable cell, searching for the acceptable cell.

3. The method of claim 1, further comprising discarding context information of the terminal in the RRC idle state.

4. The method of claim 1, further comprising stopping a radio access network-based notification area (RNA) update in the RRC idle state.

15. A non-transitory computer-readable recording medium having recorded thereon a program, which when executed by a processor of an electronic device, causes the electronic device to perform the method of claim 1.

5. A method of performing cell selection, by a base station, in a wireless communication system, the method comprising:

determining configuration information for a radio resource control (RRC) inactive state; and

transmitting a control message including the configuration information to a terminal,

wherein the terminal enters the RRC inactive state based on the configuration information, and

wherein, in response to a suitable cell not being found and an acceptable cell being found, the terminal enters a RRC idle state and camps on the acceptable cell.

6. The method of claim 5, wherein context information of the terminal is discarded in the RRC idle state.

7. The method of claim 5, wherein a radio access network-based notification area (RNA) update is stopped in the RRC idle state.

8. A terminal for performing cell selection in a wireless communication system, the terminal comprising:

a transceiver; and

a processor coupled with the transceiver and configured to;

control the transceiver to receive a control message including configuration information for a radio resource control (RRC) inactive state,

enter the RRC inactive state based on the configuration information,

perform cell selection,

in response to a suitable cell not being found and an acceptable cell being found in the cell selection, enter a RRC idle state, and

camp on the acceptable cell.

9. The terminal of claim 8, wherein the processor is further configured to:

perform a cell selection process to find the suitable cell, and

in response to the cell selection process failing to find the suitable cell, search for the acceptable cell.

10. The terminal of claim 9, wherein the processor is further configured to discard context information of the terminal in the RRC idle state.

11. The terminal of claim 9, wherein the processor is further configured to stop a radio access network-based notification area (RNA) update in the RRC idle state.

12. A base station for performing cell selection in a wireless communication system, the base station comprising:

a transceiver; and

a processor coupled with the transceiver and configured to;

determine configuration information for a radio resource control (RRC) inactive state, and

control the transceiver to transmit a control message including the configuration information to a terminal,

wherein the terminal enters the RRC inactive state based on the configuration information, and

wherein, in response to a suitable cell not being found and an acceptable cell being found, the terminal enters a RRC idle state and camps on the acceptable cell.

13. The base station of claim 12, wherein context information of the terminal is discarded in the RRC idle state.

14. The base station of claim 12, wherein a radio access network-based notification area (RNA) update is stopped in the RRC idle state.