WIDEBAND RANGING IN CELLULAR USING UNLICENSED RADIO FREQUENCY SPECTRUM BAND

• US 20160057186A1
• Filed: 07/08/2015
• Published: 02/25/2016
• Est. Priority Date: 08/19/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Wu, Xinzhou, Cheng, Hong, Patil, Shailesh, Jose, Jubin, Nallampatti Ekambaram, Venkatesan
• Granted Patent: US 10,182,088 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 45/02 Topology update or discovery
• CPC Class Codes: H04L 65/611 for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 64/003 locating network equipment
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

Methods, systems, and devices are described for utilization of an unlicensed radio frequency spectrum band for performing a ranging procedure. Performance of the ranging procedure may be triggered by a signal transmitted in a licensed radio frequency spectrum band. While conventional ranging in Long Term Evolution (LTE) communications, for example, using the licensed radio frequency spectrum band may be limited to a 10 MHz bandwidth, using the unlicensed radio frequency spectrum band for ranging may allow use of a wider bandwidth, such as 100 MHz or greater. Use of the wider bandwidth may result in more accurate ranging measurements (e.g., time-of-arrival estimation).

Claims

1. A method for wireless communications, comprising:

transmitting a signal over a licensed radio frequency spectrum band, the signal triggering performance of a ranging procedure over an unlicensed radio frequency spectrum band.

2. The method of claim 1, wherein transmitting the signal comprises transmitting a discovery signal or a ranging signal over the licensed radio frequency spectrum band.

3. The method of claim 2, wherein transmitting the signal comprises broadcasting the signal, further comprising:

receiving a plurality of ranging signals over the unlicensed radio frequency spectrum band in response to the broadcast signal.

4. The method of claim 3, further comprising:

determining positioning information associated with at least one device based at least in part on the received plurality of ranging signals.

5. The method of claim 3, further comprising:

broadcasting ranging measurements associated with the received plurality of ranging signals.

6. The method of claim 1, further comprising:

determining information for performing the ranging procedure based at least in part on the signal.

7. The method of claim 6, wherein determining information for performing the ranging procedure comprises decoding at least part of the signal.

8. The method of claim 6, wherein determining information for performing the ranging procedure comprises applying a pre-defined map.

9. The method of claim 6, wherein determining information for performing the ranging procedure comprises accessing a resource indicated by at least part of the signal.

10. The method of claim 1, wherein the signal includes information for performing the ranging procedure.

11. The method of claim 10, wherein the information included in the signal includes information comprising bandwidth, center frequency, and time slot.

12. The method of claim 10, wherein the information included in the signal is pre-configured.

13. The method of claim 1, wherein transmitting the signal is performed by a base station, the signal providing at least one parameter for coordinating the ranging procedure between at least two user equipments (UEs).

14. The method of claim 13, wherein the at least one parameter provided by the signal comprises a schedule for performance of the ranging procedure by the at least two UEs.

15. The method of claim 13, wherein the at least one parameter provided by the signal comprises a schedule for periodic performance of the ranging procedure by the at least two UEs.

16. The method of claim 1, wherein:

transmitting the signal is performed by a base station;

the ranging procedure comprises a ranging measurement; and

the signal causes at least one user equipment (UE) to report a result of the ranging measurement to the base station.

17. The method of claim 1, wherein:

transmitting the signal is performed by a base station; and

the signal includes a schedule for performing the ranging procedure over the unlicensed radio frequency spectrum band.

18. The method of claim 17, further comprising:

performing, by the base station, the ranging procedure according to the schedule.

19. The method of claim 17, wherein the signal includes a schedule for at least one other base station for performing the ranging procedure over the unlicensed radio frequency spectrum band.

20. An apparatus for wireless communication, comprising:

a transmitter to transmit a signal over a licensed radio frequency spectrum band, the signal being configured to trigger performance of a ranging procedure over an unlicensed radio frequency spectrum band.

21. The apparatus of claim 20, wherein the transmitter transmits the signal as a discovery signal or a ranging signal.

22. The apparatus of claim 21, wherein the transmitter broadcasts the signal, further comprising:

a receiver to receive a plurality of ranging signals over the unlicensed radio frequency spectrum band in response to the broadcast signal.

23. The apparatus of claim 22, wherein the transmitter further broadcasts ranging measurements associated with the received plurality of ranging signals.

24. An apparatus for wireless communication, comprising:

means for transmitting a signal over a licensed radio frequency spectrum band, the signal being configured to trigger performance of a ranging procedure over an unlicensed radio frequency spectrum band.

25. A method for wireless communications, comprising:

receiving a signal over a licensed radio frequency spectrum band; and

performing a ranging procedure over an unlicensed radio frequency spectrum band based at least in part on the received signal.

26. The method of claim 25, wherein receiving the signal comprises receiving a discovery request message from a user equipment (UE).

27. The method of claim 25, wherein performing the ranging procedure comprises transmitting a plurality of ranging signals on a same frequency of the unlicensed radio frequency spectrum band.

28. The method of claim 25, wherein performing the ranging procedure comprises transmitting at least one ranging signal on a plurality of frequencies of the unlicensed radio frequency spectrum band.

29. The method of claim 25, wherein receiving the signal comprises receiving a broadcast signal from a user equipment (UE).

30. The method of claim 29, wherein the received broadcast signal includes a plurality of ranging measurements from multiple devices, further comprising:

using a ranging measurement resulting from performing the ranging procedure over the unlicensed radio frequency spectrum band and at least one ranging measurement from the plurality of ranging measurements to determine a position of a device that performed the ranging procedure over the unlicensed radio frequency spectrum band.