Network identification based on discovery reference signals in wireless communications

• US 10,225,055 B2
• Filed: 11/24/2015
• Issued: 03/05/2019
• Est. Priority Date: 11/26/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Vajapeyam, Madhavan Srinivasan, Damnjanovic, Aleksandar, Chen, Wanshi, Gaal, Peter
• Primary Examiner(s): Onamuti, Gbemileke J
• Assistant Examiner(s): Dewan, Sanjay K
• Application Number:
  US14/950,727
• Publication Number:
  US 20160149681A1
• Time in Patent Office: 1,197 Days
• Field of Search: 370252
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems

Abstract

Various aspects described herein relate to measuring cells in a public land mobile network (PLMN). An enhanced discovery reference signal (eDRS) of a cell is received on an unlicensed carrier frequency, wherein the eDRS comprises at least a reference signal transmission or a synchronization signal transmission. Measurements of the eDRS for the cell can be performed based at least in part on a configuration associated with a serving cell. The measurements of the eDRS can be reported to the serving cell.

Claims

1. A method for measuring cells in a public land mobile network (PLMN), comprising:

receiving, via a wireless communication on an unlicensed carrier frequency, an enhanced discovery reference signal (eDRS) transmitted by a cell on the unlicensed carrier frequency, wherein the eDRS comprises at least a reference signal transmission or a synchronization signal transmission, and wherein the eDRS is subject to listen-before-talk (LBT);

performing measurements of the eDRS for the cell based at least in part on a configuration associated with a serving cell; and

reporting, via another wireless communication to the serving cell, the measurements of the eDRS.

2. The method of claim 1, wherein the reference signal transmission includes a common reference signal (CRS) and a channel state information reference signal (CSI-RS), and wherein reporting the measurements of the eDRS comprises reporting a CRS measurement and a CSI-RS measurement to the serving cell.

3. The method of claim 2, further comprising comparing the CRS measurement with the CSI-RS measurement to determine whether a difference between the CRS measurement and the CSI-RS measurement are within a threshold difference, wherein reporting the CRS measurement and the CSI-RS measurement is based at least in part on determining that the difference is within the threshold difference.

4. The method of claim 1, further comprising receiving the configuration, wherein the configuration relates to eDRS transmissions of a serving PLMN from the serving cell, and wherein performing measurements of the eDRS is based at least in part on one or more parameters of the configuration.

5. The method of claim 4, wherein the one or more parameters correspond to one or more of a subframe offset, a resource index, or a scrambling identifier identified for the eDRS transmissions transmitted as CSI-RSs.

6. The method of claim 1, further comprising:

receiving a PLMN ID of a serving PLMN from the serving cell; and

determining the configuration based at least in part on the PLMN ID, wherein the configuration relates to eDRSs transmitted as CSI-RSs of the serving PLMN,

wherein performing measurements of the eDRS is based at least in part on one or more parameters of the configuration.

7. The method of claim 6, wherein the one or more parameters correspond to one or more of a subframe offset, a resource index, or a scrambling identifier identified for the CSI-RSs.

8. The method of claim 1, further comprising:

receiving a PLMN ID of a serving PLMN from the serving cell; and

determining the configuration based at least in part on the PLMN ID, wherein the configuration relates to primary synchronization signal, secondary synchronization signal, or common reference signal transmissions of the serving PLMN,

wherein performing measurements of the eDRS is based at least in part on one or more parameters of the configuration.

9. The method of claim 1, further comprising receiving the configuration, wherein the configuration relates to primary synchronization signal, secondary synchronization signal, or common reference signal transmissions of a serving PLMN from the serving cell, and wherein performing measurements of the eDRS is based at least in part on one or more parameters of the configuration.

10. A user equipment for measuring cells in a public land mobile network (PLMN), comprising:

a transceiver;

at least one processor communicatively coupled with the transceiver via a bus for communicating signals in a wireless network; and

a memory communicatively coupled with the at least one processor and/or the transceiver via the bus;

wherein the at least one processor and the memory are operable to;

receive, via the transceiver receiving a wireless communication on an unlicensed carrier frequency, an enhanced discovery reference signal (eDRS) transmitted by a cell on the unlicensed carrier frequency, wherein the eDRS comprises at least a reference signal transmission or a synchronization signal transmission, and wherein the eDRS is subject to listen-before-talk (LBT);

perform measurements of the eDRS for the cell based at least in part on a configuration associated with a serving cell; and

report, via the transceiver transmitting another wireless communication to the serving cell, the measurements of the eDRS.

11. The user equipment of claim 10, wherein the reference signal transmission includes a common reference signal (CRS) and a channel state information reference signal (CSI-RS), and wherein the at least one processor and the memory are operable to report the measurements of the eDRS at least in part by reporting a CRS measurement and a CSI-RS measurement to the serving cell.

12. The user equipment of claim 11, wherein the at least one processor and the memory are further operable to compare the CRS measurement with the CSI-RS measurement to determine whether a difference between the CRS measurement and the CSI-RS measurement are within a threshold difference, and wherein the at least one processor and the memory are operable to report the CRS measurement and the CSI-RS measurement based at least in part on determining that the difference is within the threshold difference.

13. The user equipment of claim 10, wherein the at least one processor and the memory are further operable to receive the configuration, wherein the configuration relates to eDRS transmissions of a serving PLMN from the serving cell, and wherein the at least one processor and the memory are operable to perform measurements of the eDRS based at least in part on one or more parameters of the configuration.

14. The user equipment of claim 13, wherein the one or more parameters correspond to one or more of a subframe offset, a resource index, or a scrambling identifier identified for the eDRS transmissions transmitted as CSI-RSs.

15. The user equipment of claim 10, wherein the at least one processor and the memory are further operable to:

receive a PLMN ID of a serving PLMN from the serving cell; and

determine the configuration based at least in part on the PLMN ID, wherein the configuration relates to eDRSs transmitted as CSI-RSs of the serving PLMN,

wherein the at least one processor and the memory are operable to perform measurements of the eDRS based at least in part on one or more parameters of the configuration.

16. The user equipment of claim 15, wherein the one or more parameters correspond to one or more of a subframe offset, a resource index, or a scrambling identifier identified for the CSI-RSs.

17. The user equipment of claim 10, wherein the at least one processor and the memory are further operable to:

receive a PLMN ID of a serving PLMN from the serving cell; and

determine the configuration based at least in part on the PLMN ID, wherein the configuration relates to primary synchronization signal, secondary synchronization signal, or common reference signal transmissions of the serving PLMN,

wherein the at least one processor and the memory are operable to perform measurements of the eDRS based at least in part on one or more parameters of the configuration.

18. The user equipment of claim 10, wherein the at least one processor and the memory are further operable to receive the configuration, wherein the configuration relates to primary synchronization signal, secondary synchronization signal, or common reference signal transmissions of a serving PLMN from the serving cell, and wherein the at least one processor and the memory are operable to perform measurements of the eDRS based at least in part on one or more parameters of the configuration.

19. A user equipment for measuring cells in a public land mobile network (PLMN), comprising:

means for receiving, via a wireless communication on an unlicensed carrier frequency, an enhanced discovery reference signal (eDRS) transmitted by a cell on the unlicensed carrier frequency, wherein the eDRS comprises at least a reference signal transmission or a synchronization signal transmission, and wherein the eDRS is subject to listen-before-talk (LBT);

means for performing measurements of the eDRS for the cell based at least in part on a configuration associated with a serving cell; and

means for reporting, via another wireless communication to the serving cell, the measurements of the eDRS.

20. The user equipment of claim 19, wherein the reference signal transmission includes a common reference signal (CRS) and a channel state information reference signal (CSI-RS), and wherein the means for reporting reports a CRS measurement and a CSI-RS measurement to the serving cell.

21. The user equipment of claim 19, further comprising means for receiving the configuration, wherein the configuration relates to eDRS transmissions of a serving PLMN from the serving cell, and wherein the means for performing performs measurements of the eDRS based at least in part on one or more parameters of the configuration.

22. The user equipment of claim 19, further comprising:

means for receiving a PLMN ID of a serving PLMN from the serving cell; and

means for determining the configuration based at least in part on the PLMN ID, wherein the configuration relates to eDRSs transmitted as CSI-RSs of the serving PLMN,

wherein the means for performing performs measurements of the eDRS based at least in part on one or more parameters of the configuration.

23. The user equipment of claim 19, further comprising:

means for receiving a PLMN ID of a serving PLMN from the serving cell; and

means for determining the configuration based at least in part on the PLMN ID, wherein the configuration relates to primary synchronization signal, secondary synchronization signal, or common reference signal transmissions of the serving PLMN,

wherein the means for performing performs measurements of the eDRS based at least in part on one or more parameters of the configuration.

24. The user equipment of claim 19, further comprising means for receiving the configuration, wherein the configuration relates to primary synchronization signal, secondary synchronization signal, or common reference signal transmissions of a serving PLMN from the serving cell, and wherein the means for performing performs measurements of the eDRS based at least in part on one or more parameters of the configuration.

25. A non-transitory computer-readable storage medium comprising computer-executable code for measuring cells in a public land mobile network (PLMN), the code comprising:

code for receiving, via a wireless communication on an unlicensed carrier frequency, an enhanced discovery reference signal (eDRS) transmitted by a cell on the unlicensed carrier frequency, wherein the eDRS comprises at least a reference signal transmission or a synchronization signal transmission, and wherein the eDRS is subject to listen-before-talk (LBT);

code for performing measurements of the eDRS for the cell based at least in part on a configuration associated with a serving cell; and

code for reporting, via another wireless communication to the serving cell, the measurements of the eDRS.

26. The non-transitory computer-readable storage medium of claim 25, wherein the reference signal transmission includes a common reference signal (CRS) and a channel state information reference signal (CSI-RS), and wherein the code for reporting reports a CRS measurement and a CSI-RS measurement to the serving cell.

27. The non-transitory computer-readable storage medium of claim 25, further comprising code for receiving the configuration, wherein the configuration relates to eDRS transmissions of a serving PLMN from the serving cell, and wherein the code for performing performs measurements of the eDRS based at least in part on one or more parameters of the configuration.

28. The non-transitory computer-readable storage medium of claim 25, further comprising:

code for receiving a PLMN ID of a serving PLMN from the serving cell; and

code for determining the configuration based at least in part on the PLMN ID, wherein the configuration relates to eDRSs transmitted as CSI-RSs of the serving PLMN,

wherein the code for performing performs measurements of the eDRS based at least in part on one or more parameters of the configuration.

29. The non-transitory computer-readable storage medium of claim 25, further comprising:

code for receiving a PLMN ID of a serving PLMN from the serving cell; and

code for determining the configuration based at least in part on the PLMN ID, wherein the configuration relates to primary synchronization signal, secondary synchronization signal, or common reference signal transmissions of the serving PLMN,

wherein the code for performing performs measurements of the eDRS based at least in part on one or more parameters of the configuration.

30. The computer-readable storage medium of claim 25, further comprising code for receiving the configuration, wherein the configuration relates to primary synchronization signal, secondary synchronization signal, or common reference signal transmissions of a serving PLMN from the serving cell, and wherein the code for performing performs measurements of the eDRS based at least in part on one or more parameters of the configuration.