TYPE 1 AND TYPE 2 HOPPING FOR DEVICE-TO-DEVICE COMMUNICATIONS

• US 20160020822A1
• Filed: 06/03/2015
• Published: 01/21/2016
• Est. Priority Date: 07/17/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tavildar, Saurabha Rangrao, Li, Qiao
• Granted Patent: US 9,608,690 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 1/715 Interference-related aspects
• CPC Class Codes: H04B 2001/7152 with means for suppressing interference
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/53 based on regulatory allocation policies

Abstract

Methods, systems, and devices are described for coordinating a device to device (D2D) hopping scheme with a wide area network (WAN) hopping scheme. In one aspect, a method may include identifying, by a base station, a WAN frequency hopping scheme. The base station may coordinate a D2D frequency hopping scheme a D2D enabled user equipment (UE) with the identified WAN frequency hopping scheme, and communicate the D2D frequency hopping scheme to the D2D enabled UE. In one aspect, the D2D frequency hopping pattern may apply to retransmissions between two D2D enabled UEs. Another method may include receiving, by a D2D enabled UE, a D2D frequency hopping scheme from a base station, where the D2D frequency hopping scheme is coordinated with a WAN frequency hopping scheme. The D2D enabled UE may transmit at least one message to a second D2D enabled UE according to the D2D frequency hopping scheme.

Claims

1. A method of wireless communication comprising:

identifying, by a base station, a wide area network (WAN) frequency hopping scheme;

coordinating a device to device (D2D) frequency hopping scheme for at least one D2D enabled user equipment (UE) with the identified WAN frequency hopping scheme; and

communicating the D2D frequency hopping scheme to the at least one D2D enabled UE.

2. The method of claim 1, wherein coordinating the D2D frequency hopping scheme with the WAN frequency hopping scheme comprises:

configuring the D2D frequency hopping scheme to reduce interference with the WAN frequency hopping scheme.

3. The method of claim 1, wherein the WAN frequency hopping scheme comprises a fixed offset signaled via a Physical Downlink Control Channel (PDCCH) for every other transmission of a Hybrid Automatic Repeat Request (HARD) process.

4. The method of claim 3, wherein coordinating the D2D frequency hopping scheme with the WAN frequency hopping scheme comprises:

utilizing a first offset for even transmissions, wherein each even transmission is transmitted an even number of subframes after a first transmission; and

utilizing a second offset for odd transmissions, wherein each odd transmission is transmitted an odd number of subframes after the first transmission.

5. The method of claim 4, wherein the second offset is set to zero.

6. The method of claim 4, wherein communicating the D2D frequency hopping scheme to the at least one D2D enabled UE comprises:

transmitting at least one of the first offset, or the second offset, or both, via the PDCCH.

7. The method of claim 4, wherein at least one of the fixed offset, or the first offset, or the second offset, or a combination thereof comprise a number of resource blocks.

8. The method of claim 1, further comprising:

identifying a set of resources specific to D2D communications, wherein the D2D frequency hopping scheme is based at least in part on the identified set of resources.

9. The method of claim 1, wherein,

the WAN frequency hopping scheme comprises a cell specific hopping and mirroring scheme;

and

the coordinating the D2D frequency hopping scheme with the WAN frequency hopping scheme comprises;

associating a cell identification (ID) of the base station with the D2D frequency hopping scheme.

10. The method of claim 9, wherein communicating the D2D frequency hopping scheme to the at least one D2D enabled UE comprises:

transmitting a D2D scheduling grant via a physical downlink control channel (PDCCH) to the at least one D2D enabled UE.

11. The method of claim 10, wherein the D2D scheduling grant comprises:

instructions instructing the D2D enabled UE to transmit the cell ID to a second D2D enabled UE, wherein the second D2D enabled UE is not associated with the cell ID.

12. The method of claim 9, wherein communicating the D2D frequency hopping scheme to the at least one D2D enabled UE comprises:

transmitting a D2D scheduling grant to the at least one D2D enabled UE specifying a first resource to transmit a scheduling assignment.

13. The method of claim 11, wherein the D2D scheduling grant comprises instructions instructing the D2D enabled UE to transmit the cell ID to a second D2D enabled UE, wherein the second D2D enabled UE is not associated with the cell ID, wherein a first resource implicitly indicates the cell ID.

14. The method of claim 1, wherein the WAN frequency hopping scheme comprises a cell specific hopping and mirroring scheme;

and

wherein coordinating the D2D frequency hopping scheme with the WAN frequency hopping scheme comprises;

determining a subset of resources for the D2D frequency hopping scheme based on resources for the WAN frequency hopping scheme.

15. The method of claim 14, wherein communicating the D2D frequency hopping scheme to the at least one D2D enabled UE comprises:

transmitting an indication of the subset of resources for the D2D frequency hopping scheme to the at least one D2D enabled UE.

16. The method of claim 15, wherein the indication of the subset of resources comprises a low resource block threshold or a high resource block threshold, or both.

17. The method of claim 1, wherein the WAN frequency hopping scheme applies to uplink transmissions.

18. The method of claim 17, wherein the WAN frequency hopping scheme utilizes synchronous Hybrid Automatic Repeat Request (HARD).

19. A method of wireless communication comprising:

receiving, by a device to device (D2D) enabled user equipment (UE), a D2D frequency hopping scheme from a base station associated with a wide area network (WAN), wherein the D2D frequency hopping scheme is coordinated with a WAN frequency hopping scheme; and

transmitting at least one D2D message to a second D2D enabled UE according to the D2D frequency hopping scheme.

20. The method of claim 19, wherein the at least one message comprises a scheduling assignment.

21. The method of claim 19, wherein the D2D frequency hopping scheme comprises a first offset to be applied for even transmissions, wherein each even transmission is transmitted an even number of subframes after a first transmission.

22. The method of claim 21, wherein the D2D frequency hopping scheme further comprises a second offset to be applied for odd transmissions, wherein each odd transmission is transmitted an odd number of subframes after the first transmission.

23. The method of claim 19, wherein the WAN frequency hopping scheme comprises a cell specific hopping and mirroring scheme;

wherein the D2D frequency hopping scheme is associated with a cell identification (ID), wherein the cell ID is further associated with the WAN frequency hopping scheme; and

wherein the method further comprises;

determining resources for transmitting the at least one D2D message based on the WAN frequency hopping scheme.

24. The method of claim 23, further comprising transmitting the at least one D2D message on a first resource, wherein the first resource implicitly indicates the cell ID.

25. The method of claim 19, wherein the WAN frequency hopping scheme comprises a cell specific hopping and mirroring scheme;

and

wherein the D2D frequency hopping scheme further comprises a low resource block threshold or a high resource block threshold; and

wherein the method further comprises;

determining resources for transmitting the at least one D2D message based on the low resource block threshold or the high resource block threshold.

26. A base station comprising:

a wide area network (WAN) frequency hopping module to identify a WAN frequency hopping scheme;

a device to device (D2D) frequency hopping module to coordinate a D2D frequency hopping scheme for at least one D2D enabled user equipment (UE) with the identified WAN frequency hopping scheme; and

a transmitter to communicate the D2D frequency hopping scheme to the at least one D2D enabled UE.

27. The base station of claim 26, wherein the D2D frequency hopping module is configured to configure the D2D frequency hopping scheme to reduce interference with the WAN frequency hopping scheme.

28. The base station of claim 26, wherein the WAN frequency hopping scheme comprises a fixed offset signaled via a Physical Downlink Control Channel (PDCCH) for every other transmission of a Hybrid Automatic Repeat Request (HARD) process.

29. A user equipment (UE) comprising:

a device to device (D2D) frequency hopping determination module to receive a D2D frequency hopping scheme from a base station associated with a wide area network (WAN), wherein the D2D frequency hopping scheme is coordinated with a WAN frequency hopping scheme; and

a transmitter to transmit at least one message to a second D2D enabled UE according to the D2D frequency hopping scheme.

30. The UE of claim 29, wherein the at least one message comprises a scheduling assignment.