Inter-UE interference cancellation

• US 9,544,082 B2
• Filed: 07/16/2013
• Issued: 01/10/2017
• Est. Priority Date: 08/03/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Malladi, Durga Prasad, Wei, Yongbin
• Primary Examiner(s): Crutchfield, Christopher
• Assistant Examiner(s): TRAN, THINH D
• Application Number:
  US13/943,716
• Publication Number:
  US 20140036801A1
• Time in Patent Office: 1,274 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 1/7097 Interference-related aspects
• CPC Class Codes: H04J 11/0023 Interference mitigation or co-ordination direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04J 11/0059 Out-of-cell user aspects
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

Interference cancellation occurs for devices, where the source of the interference is another UE. The victim UE receiver identifies subframes vulnerable to potential interference from other UEs. Candidate resource blocks in the identified vulnerable subframes are listed. Interference is cancelled for edge resource blocks and valid contiguous resource blocks.

Claims

1. A method of wireless communication, comprising:

identifying, at a user equipment (UE), system information from a neighboring cell to identify a time domain resource allocation of the neighboring cell, in which the UE is served by a serving cell that is different from the neighboring cell;

identifying, at the UE, at least one candidate resource potentially interfered with based on a comparison of the time domain resource allocation of the neighboring cell and a time domain resource allocation of the serving cell;

identifying, at the UE, at least one interfered resource from the at least one candidate resource by detecting uplink interference from at least one uplink resource of the neighboring cell on the at least one candidate resource based at least in part on an interference detection criteria; and

performing, at the UE, interference cancellation on the at least one uplink resource.

2. The method of claim 1, in which the time domain resource allocation of the neighboring cell and the time domain resource allocation of the serving cell are subframe allocation configurations.

3. The method of claim 2, in which the subframe allocation configurations are:

time division duplex (TDD) subframe configurations;

or

device-to-device (D2D) subframe configurations.

4. The method of claim 3, in which the subframe allocation configurations are TDD configurations and the at least one candidate resource comprises at least one subframe on which the time domain resource allocation of the neighboring cell includes an uplink subframe and the time domain resource allocation of the serving cell includes a downlink subframe.

5. The method of claim 3, in which the subframe allocation configurations are D2D configurations and the at least one candidate resource comprises at least one subframe on which the time domain resource allocation of the neighboring cell includes a D2D subframe and the time domain resource allocation of the serving cell includes a wide area network (WAN) subframe.

6. The method of claim 1, in which the time domain resource allocation of the neighboring cell and the time domain resource allocation of the serving cell are allocated different transmission types.

7. The method of claim 6, in which identifying at least one interfered resource comprises detecting at least traffic information, pilot information, modulation information, spatial rank information, or a combination thereof.

8. The method of claim 1, in which identifying the system information comprises reading neighbor cell system information or channel system information.

9. The method of claim 1, in which the at least one uplink resource comprises at least one resource block (RB).

10. The method of claim 9, further comprising at least:

selecting edge resource blocks from the at least one RB for physical uplink control channel (PUCCH) interference cancellation;

selecting edge resource blocks from the at least one RB for physical random access channel (PRACH) interference cancellation;

selecting valid contiguous resource blocks from the at least one RB for physical uplink shared channel (PUSCH) interference cancellation;

or

a combination thereof.

11. A user equipment (UE) configured for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory, the at least one processor being configured;

to identify system information from a neighboring cell to identify a time domain resource allocation of the neighboring cell, in which the UE is served by a serving cell that is different from the neighboring cell;

to identify at least one candidate resource potentially interfered with based on a comparison of the time domain resource allocation of the neighboring cell and a time domain resource allocation of the serving cell;

to identify at least one resource from the at least one candidate resource by detecting uplink interference from at least one uplink resource of the neighboring cell on the at least one candidate resource based at least in part on an interference detection criteria; and

to perform interference cancellation on the at least one uplink resource.

12. The UE of claim 11, in which the time domain resource allocation of the neighboring cell and the time domain resource allocation of the serving cell are subframe allocation configurations.

13. The UE of claim 12, in which the subframe allocation configurations are:

time division duplex (TDD) subframe configurations;

or

device-to-device (D2D) subframe configurations.

14. The UE of claim 13, in which the subframe allocation configurations are TDD configurations and the at least one candidate resource comprises at least one subframe on which the time domain resource allocation of the neighboring cell includes an uplink subframe and the time domain resource allocation of the serving cell includes a downlink subframe.

15. The UE of claim 13, in which the subframe allocation configurations are D2D configurations and the at least one candidate resource comprises at least one subframe on which the time domain resource allocation of the neighboring cell includes a D2D subframe and the time domain resource allocation of the serving cell includes a wide area network (WAN) subframe.

16. The UE of claim 11, in which the time domain resource allocation of the neighboring cell and the time domain resource allocation of the serving cell are allocated different transmission types.

17. The UE of claim 16, in which the at least one processor is configured to identify at least one interfered resource by detecting at least traffic information, pilot information, modulation information, spatial rank information, or a combination thereof.

18. The UE of claim 11, in which the at least one processor is configured to identify the system information by reading neighbor cell system information or channel system information.

19. The UE of claim 11, in which the at least one uplink resource comprises at least one resource block (RB).

20. The UE of claim 19, in which the at least one processor is further configured:

to select edge resource blocks from the at least one RB for physical uplink control channel (PUCCH) interference cancellation;

to select edge resource blocks from the at least one RB for physical random access channel (PRACH) interference cancellation;

to select valid contiguous resource blocks from the at least one RB for physical uplink shared channel (PUSCH) interference cancellation;

or

a combination thereof.

21. A computer program product for wireless communication in a wireless network, comprising:

a non-transitory computer-readable medium having non-transitory program code recorded thereon, the program code comprising;

program code to identify, at a user equipment (UE), system information from a neighboring cell to identify a time domain resource allocation of the neighboring cell, in which the UE is served by a serving cell that is different from the neighboring cell;

program code to identify, at the UE, at least one candidate resource potentially interfered with based on a comparison of the time domain resource allocation of the neighboring cell and a time domain resource allocation of the serving cell;

program code to identify, at the UE, at least one resource from the at least one candidate resource by detecting uplink interference from at least one uplink resource of the neighboring cell on the at least one candidate resource based at least in part on an interference detection criteria; and

program code to perform, at the UE, interference cancellation on the at least one uplink resource.

22. An apparatus for wireless communication, comprising:

means for identifying, at a user equipment (UE), system information from a neighboring cell to identify a time domain resource allocation of the neighboring cell, in which the UE is served by a serving cell that is different from the neighboring cell;

means for identifying, at the UE, at least one candidate resource potentially interfered with based on a comparison of the time domain resource allocation of the neighboring cell and a time domain resource allocation of the serving cell;

means for identifying, at the UE, at least one resource from the at least one candidate resource by detecting uplink interference from at least one uplink resource of the neighboring cell on the at least one candidate resource based at least in part on an interference detection criteria; and

means for performing, at the UE, interference cancellation on the at least one uplink resource.