METHOD AND DEVICE FOR PERFORMING CELL RESELECTION BY TERMINAL

• US 20200137652A1
• Filed: 12/27/2019
• Published: 04/30/2020
• Est. Priority Date: 08/30/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Sangwon, LEE, Youngdae
• Granted Patent: US 11,064,412 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 36/0007 for multicast or broadcast services, e.g. MBMS multicast or broadcast application services H04W4/06; resource management for broadcast services H04W72/30; connection management for selective distribution or broadcast H04W76/40
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• 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

Abstract

Provided are a method for performing cell reselection by a terminal in a wireless communication system and a device for supporting same. The terminal detects a single-cell point-to-multipoint (SCPTM) cell of interest, calculates the ranking of the SCPTM cell of interest, and performs cell reselection on the basis of the calculated ranking. The ranking of the SCPTM cell of interest can be calculated by means of applying a cell-specific priority (CSP).

Claims

1. A method performed by a wireless device in a wireless communication system, the method comprising:

receiving offset information from a serving cell that the wireless device is camping on;

calculating a ranking for a neighbor cell based on the offset information; and

performing a cell reselection based on the calculated ranking,

wherein the offset information includes a first offset applied to a measurement result of the neighbor cell in dependence on whether a frequency on which the neighbor cell is configured is an inter-frequency or an intra-frequency of the serving cell,

wherein the offset information further includes a second offset applied to the measurement result of the neighbor cell temporarily, and

wherein the offset information further includes a third offset applied to the measurement result of the neighbor cell when the neighbor cell is a single cell point to multipoint (SCPTM) cell.

2. The method of claim 1, wherein the neighbor cell is a cell which provides a multimedia broadcast multicast service (MBMS) service via SCPTM transmission.

3. The method of claim 1, wherein the neighbor cell is configured on a SCPTM frequency.

4. The method of claim 1, wherein the third offset for the neighbor cell is defined as a cell specific priority (CSP) value.

5. The method of claim 1, further comprising:

receiving a multimedia broadcast multicast service (MBMS) service via the neighbor cell, if the cell reselection is performed to the neighbor cell.

6. The method of claim 1, wherein if the calculated ranking for the neighbor cell is highest among all neighbor cells, the cell reselection is performed to the neighbor cell.

7. The method of claim 1, wherein the ranking for the neighbor cell is defined by:

R=Qmeas−

Qoffset−

Qoffsettemp+CSP,

where R denotes the ranking for the neighbor cell, Qmeas denotes the measurement result of the neighbor cell, Qoffset denotes the first offset, Qoffsettemp denotes the second offset, and CSP denotes the third offset.

8. The method of claim 1, further comprising calculating a ranking for a non-SCPTM cell,

wherein the ranking for the non-SCPTM cell is calculated without the third offset.

9. The method of claim 1, further comprising:

performing measurement on a SCPTM frequency on which a SCPTM cell of interest is configured; and

detecting the SCPTM cell of interest on the SCPTM frequency.

10. A wireless device in a wireless communication system, the wireless device comprising:

a memory;

a transceiver; and

a processor coupled to the memory and the transceiver,

wherein the processor is configured to;

control the transceiver to receive offset information from a serving cell that the wireless device is camping on;

calculate a ranking for a neighbor cell based on the offset information; and

perform a cell reselection based on the calculated ranking,

wherein the offset information includes a first offset applied to a measurement result of the neighbor cell in dependence on whether a frequency on which the neighbor cell is configured is an inter-frequency or an intra-frequency of the serving cell,

wherein the offset information further includes a second offset applied to the measurement result of the neighbor cell temporarily, and

wherein the offset information further includes a third offset applied to the measurement result of the neighbor cell when the neighbor cell is a single cell point to multipoint (SCPTM) cell.

11. The wireless device of claim 10, wherein the neighbor cell is a cell which provides a multimedia broadcast multicast service (MBMS) service via SCPTM transmission.

12. The wireless device of claim 10, wherein the neighbor cell is configured on a SCPTM frequency.

13. The wireless device of claim 10, wherein the third offset for the neighbor cell is defined as a cell specific priority (CSP) value.

14. The wireless device of claim 10, wherein the processor is further configured to:

control the transceiver to receive a multimedia broadcast multicast service (MBMS) service via the neighbor cell, if the cell reselection is performed to the neighbor cell.

15. The wireless device of claim 10, wherein if the calculated ranking for the neighbor cell is highest among all neighbor cells, the cell reselection is performed to the neighbor cell.