Cell selection/re-selection method for inter-frequency sidelink operation executed by terminal in wireless communication system, and terminal using said method

• US 10,548,058 B2
• Filed: 11/04/2016
• Issued: 01/28/2020
• Est. Priority Date: 11/04/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Jung, Sunghoon, Lee, Jaewook
• Primary Examiner(s): Sivji, Nizar N
• Application Number:
  US15/773,546
• Publication Number:
  US 20180324660A1
• Time in Patent Office: 1,180 Days
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link
• CPC Class Codes: H04W 36/04 Reselecting a cell layer in multi-layered cells
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

Provided are a cell selection/re-selection method for an inter-frequency sidelink operation executed by a terminal in a wireless communication system, and a terminal using the method. The method is characterized by determining whether cell selection/re-selection parameters which can be applied to a non-serving frequency to execute a sidelink operation have been configured and received; and when the cell selection/re-selection parameters have been configured and received, performing an evaluation for the cell selection/reselection or ranking of a cell in the non-serving frequency by using the cell selection/re-selection parameters.

Claims

1. A cell selection method for an inter-frequency sidelink operation performed by a user equipment (UE) in a wireless communication system, the cell selection method comprising:

receiving, by the UE from a serving cell, system information that includes a cell selection parameter; and

performing evaluation for cell selection of a cell of a non-serving frequency using the cell selection parameter received from the serving cell,

wherein the UE selects the cell of the non-serving frequency for sidelink discovery announcement based on the evaluation,

wherein the cell selection parameter includes a required minimum received power level in the cell of the non-serving frequency, and

wherein when a specific parameter is not included in the cell selection parameter, which is used for the performing the evaluation for the cell selection of the cell of the non-serving frequency, the UE applies a zero value to the specific parameter.

2. The cell selection method of claim 1, wherein the system information is a system information block (SIB) 19.

3. The cell selection method of claim 1, wherein when the UE selects the cell of the non-serving frequency, the UE transmits the sidelink discovery announcement message on the cell.

4. The cell selection method of claim 1, wherein the cell selection parameter is provided through a radio resource control (RRC) message.

5. The cell selection method of claim 1, wherein when the UE selects the cell of the non-serving frequency, the UE re-selects a best-ranked cell of the non-serving frequency using the cell selection parameter received from the serving cell.

6. The cell selection method of claim 1, wherein the required minimum received power level is a minimum reference signal received power (RSRP) level for camping on the cell of the non-serving frequency.

11. The cell selection method of claim 1, wherein the UE performs the evaluation without receiving another system information on the cell.

7. A user equipment (UE) comprising:

a radio frequency (RF) unit transmitting and receiving a wireless signal; and

a processor coupled to the RF unit,

wherein the processor is configured to;

receive, via the RF unit from a serving cell, system information that includes a cell selection parameter, and

perform evaluation for cell selection of a cell of a non-serving frequency using the cell selection parameter received from the serving cell,

wherein the UE selects the cell of the non-serving frequency for sidelink discovery announcement based on the evaluation,

wherein the cell selection parameter includes a required minimum received power level in the cell of the non-serving frequency, and

wherein when a specific parameter is not included in the cell selection parameter, which is used for the perform the evaluation for the cell selection of the cell of the non-serving frequency, the UE applies a zero value to the specific parameter.

8. The UE of claim 7, wherein the system information is a system information block (SIB) 19.

9. The UE of claim 7, wherein when the UE selects the cell of the non-serving frequency, the UE transmits the sidelink discovery announcement message on the cell.

10. The UE of claim 7, wherein the cell selection parameter is provided through a radio resource control (RRC) message.