Supporting different LTE-TDD configurations in neighboring regions and/or adjacent carriers

Patent metadata

Field	Value
Publication number	US-9585156-B2
Application number	US-201213672458-A
Country	US
Kind code	B2
Filing date	Nov 8, 2012
Priority date	Nov 14, 2011
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

When communications of a single radio access technology (RAT), or different radio access technologies in a proximate communication spectrum are operating at the same time, potential interference between devices may occur. To reduce the interference, the time division duplex (TDD) configuration of one or more conflicting device may be altered. For example, at the edge of a communication region, TDD configurations used by edge base stations to communicate with mobile devices may be set to reduce interference. As another example, communications of a first device may be altered so the first device schedules uplink communications when a second device also has uplink communications scheduled. Other configurations may also be implemented.

First claim

What is claimed is:

1. A method of wireless communication at a base station, comprising:
determining, at the base station, when downlink time division duplex (TDD) communications of a first user equipment (UE) experience interference from uplink TDD communications of a second UE when communication frames of the first UE and second UE are aligned, the first UE being assigned a first TDD configuration and the second UE being assigned a second TDD configuration;
scheduling, at the base station, communications by at least scheduling the first UE with a new TDD configuration that is different from the first TDD configuration and the second TDD configuration to reduce the interference; and
instructing, at the base station, the first UE to use the new TDD configuration while the base station operates with the first TDD configuration.

2. The method of claim 1 , in which the scheduling comprises scheduling uplink communications of the second UE only on subframes when the first UE is engaged in uplink communications.

3. The method of claim 1 in which the new TDD configuration is different from a TDD configuration for other UEs served by the base station serving the first UE.

4. The method of claim 1 , in which the scheduling comprises scheduling the first UE with TDD configuration 0.

5. The method of claim 1 , further comprising detecting the second UE causing the interference.

6. The method of claim 1 , further comprising detecting the first UE experiencing the interference.

7. The method of claim 1 , in which the scheduling comprises scheduling uplink communications of the second UE to avoid at least one edge resource block on a frequency closest to a frequency used by the first UE.

8. The method of claim 1 , in which the scheduling comprises prioritizing scheduling uplink resources of potential aggressor UEs to avoid at least one edge resource block of a subframe that would cause the interference.

9. The method of claim 8 , in which the potential aggressor UEs comprises UEs transmitting at a high power and/or UEs allocated a large number of resource blocks.

10. The method of claim 1 , in which the scheduling comprises scheduling uplink communications of the second UE to avoid at least one edge resource block of a subframe that would cause the interference.

11. The method of claim 1 , in which the scheduling comprises the second UE scheduling its communications to avoid the interference to the first UE.

12. The method of claim 1 , in which the second UE performs the determining and the method further comprises sending a report of interference to the base station.

13. The method of claim 1 , in which the scheduling comprises reducing a resource allocation to the second UE.

14. The method of claim 1 , further comprising advertising different TDD configurations to different UEs.

15. An apparatus for wireless communication at a base station, comprising:
means for determining when downlink time division duplex (TDD) communications of a first user equipment (UE) experience interference from uplink TDD communications of a second UE when communication frames of the first UE and second UE are aligned, the first UE being assigned a first TDD configuration and the second UE being assigned a second TDD configuration;
means for scheduling communications by at least scheduling the first UE with a new TDD configuration that is different from the first TDD configuration and the second TDD configuration to reduce the interference; and
means for instructing the first UE to use the new TDD configuration while the base station operates with the first TDD configuration.

16. A non-transitory computer-readable medium having non-transitory program code recorded thereon at a base station, the non-transitory program code comprising:
program code, at the base station, to determine when downlink time division duplex (TDD) communications of a first user equipment (UE) experience interference from uplink TDD communications of a second UE when communication frames of the first UE and second UE are aligned, the first UE being assigned a first TDD configuration and the second UE being assigned a second TDD configuration;
program code, at the base station, to schedule communications by at least scheduling the first UE with a new TDD configuration that is different from the first TDD configuration and the second TDD configuration to reduce the interference; and
program code, at the base station, to instruct the first UE to use the new TDD configuration while the base station operates with the first TDD configuration.

17. A base station configured for wireless communications, comprising:
a memory; and
at least one processor coupled to the memory, the at least one processor being configured:
to determine when downlink time division duplex (TDD) communications of a first user equipment (UE) experience interference from uplink TDD communications of a second UE when communication frames of the first UE and second UE are aligned, the first UE being assigned a first TDD configuration and the second UE being assigned a second TDD configuration;
to schedule communications by at least scheduling the first UE with a new TDD configuration that is different from the first TDD configuration and the second TDD configuration to reduce the interference; and
to instruct the first UE to use the new TDD configuration while the base station operates with the first TDD configuration.

18. The base station of claim 17 , in which the at least one processor is further configured to schedule uplink communications of the second UE only on subframes when the first UE is engaged in uplink communications.

19. The base station of claim 17 in which the new TDD configuration is different from a TDD configuration for other UEs served by the base station serving the first UE.

20. The base station of claim 17 in which the at least one processor is further configured to schedule the first UE with TDD configuration 0.

21. The base station of claim 17 , in which the at least one processor is further configured to detect an aggressor UE causing user equipment to user equipment interference.

22. The base station of claim 17 , in which the at least one processor is further configured to detect a victim UE experiencing user equipment to user equipment interference.

23. The base station of claim 17 , in which the at least one processor is further configured to schedule uplink communications of the second UE to avoid at least one edge resource block on a frequency closest to a frequency used by the first UE.

24. The base station of claim 17 , in which the at least one processor is further configured to schedule by prioritizing scheduling of uplink resources of potential aggressor UEs to avoid at least one edge resource block of a subframe that would cause the interference.

25. The base station of claim 24 , in which the potential aggressor UEs comprises UEs transmitting at a high power and/or UEs allocated a large number of resource blocks.

26. The base station of claim 17 , in which the at least one processor is further configured to schedule by scheduling uplink communications of the second UE to avoid at least one edge resource block of a subframe that would cause the interference.

27. The base station of claim 17 , in which the second UE comprises the at least one processor and the at least one processor is further configured to schedule communicatio

Assignees

• Qualcomm Inc

Inventors

• Bhattad Kapil
• Gore Dhananjay Ashok
• Kadous Tamer Adel
• Mantravadi Ashok
• Sadek Ahmed
• Kumar Raj

Classifications

• H04W72/541 Primary

  using the level of interference · CPC title

• H04B7/2656

  for structure of frame, burst · CPC title

• H04J11/0023

  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 title

• H04L5/1484 Primary

  operating bytewise · CPC title

• H04W72/12

  Wireless traffic scheduling · CPC title