Method and apparatus for wireless communication

• US 10,674,385 B2
• Filed: 06/19/2018
• Issued: 06/02/2020
• Est. Priority Date: 10/28/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yi, Yunjung
• Primary Examiner(s): Lo, Diane L
• Application Number:
  US16/012,476
• Publication Number:
  US 20180302814A1
• Time in Patent Office: 714 Days
• Field of Search: None
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• 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 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Operations of a UE and eNB are provided when there is a cell which can perform cell on/off. In this case, the UE may performs receiving signal on downlink channel and processing with the signal on the downlink channel. In addition, the signal on the downlink channel may includes a discovery signal when the cell is off-state, and the discovery signal is a signal used for cell identification and/or measurement.

Claims

1. A method for performing a measurement in a wireless communication system, the method performed at a user equipment (UE) and comprising:

determining whether a secondary cell is activated or deactivated;

determining whether the UE is configured to receive Multimedia Broadcast/Multicast Service (MBMS) on the secondary cell;

receiving one or more discovery signals from the secondary cell based on the secondary cell being deactivated and being not configured to receive the MBMS on the secondary cell,

wherein the UE assumes that any signals, except for the one or more discovery signals, are not transmitted by the secondary cell; and

performing the measurement by using the one or more received discovery signals.

2. The method of claim 1, wherein the one or more received discovery signals are used for a cell identification.

3. The method of claim 1, wherein the any signals include at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH), a common reference signal (CRS), a physical control format indictor channel (PCFICH), a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), an enhanced physical downlink control channel (EPDCCH), or a physical hybrid-ARG indicator channel (PHICH).

4. The method of claim 1, wherein, if it is determined that the UE is configured to receive the MBMS on the secondary cell, the UE does not receive a cell specific reference signal (CRS) during a duration associated with an activated of the secondary cell.

5. The method of claim 1, wherein, if it is determined that the UE is configured to receive the MBMS on the secondary cell, the UE does not receive a physical downlink control channel (PDCCH) during a duration associated with an activated of the secondary cell.

6. The method of claim 1, wherein a higher layer signal from the secondary cell indicates whether the UE is configured to receive the MBMS on the secondary cell.

7. A user equipment (UE) for performing a measurement in a wireless communication system, comprising:

a radio frequency unit receiving a signal;

a processor coupled to the radio frequency unit and configured to;

determine whether a secondary cell is activated or deactivated;

determine whether the UE is configured to receive Multimedia Broadcast/Multicast Service (MBMS) on the secondary cell;

receiving one or more discovery signals from the secondary cell based on the secondary cell being deactivated and being not configured to receive the MBMS on the secondary cell,

wherein the UE assumes that any signals, except for the one or more discovery signals, are not transmitted by the secondary cell; and

perform the measurement by using the one or more received discovery signals.

8. The UE of claim 7, wherein the one or more discovery signals are used for the cell identification.

9. The UE of claim 7, wherein the any signals include at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH), a common reference signal (CRS), a physical control format indictor channel (PCFICH), a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), an enhanced physical downlink control channel (EPDCCH), or a physical hybrid-ARG indicator channel (PHICH).

10. The UE of claim 7, wherein, if it is determined that the UE is configured to receive the MBMS on the secondary cell, the UE does not receive a cell specific reference signal (CRS) during a duration associated with an activated of the secondary cell.

11. The UE of claim 7, wherein, if it is determined that the UE is configured to receive the MBMS on the secondary cell, the UE does not receive a physical downlink control channel (PDCCH) during a duration associated with an activated of the secondary cell.

12. The UE of claim 7, wherein a higher layer signal from the secondary cell indicates whether the UE is configured to receive the MBMS on the secondary cell.