Methods, apparatus and systems for interference management in a full duplex radio system

• US 10,243,720 B2
• Filed: 12/11/2014
• Issued: 03/26/2019
• Est. Priority Date: 12/18/2013
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: IDAC Holdings, Inc. (InterDigital, Inc.)
• Inventors: Lee, Moon-Il, Stern-Berkowitz, Janet A., Tooher, J. Patrick, Tamaki, Nobuyuki
• Primary Examiner(s): Butt, Walli Z
• Application Number:
  US15/103,441
• Publication Number:
  US 20160330011A1
• Time in Patent Office: 1,566 Days
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0066 Requirements on out-of-channel emissions
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/243 taking into account interferences

Abstract

Methods, apparatus and systems for enabling interference avoidance, for example from self and neighboring interference are disclosed. In one representative method implemented in a Wireless Transmit/Receive Unit (WTRU) using time-frequency (TF) resources in first and second directions, the method includes comprising TF resource muting or symbol muting, by the WTRU, one or more TF resources for communication in the first direction based on information associated with a communication in the second direction or subframe shortening, by the WTRU, by one or more TF resources for communication in the first direction based on information associated with a communication in the second direction.

Claims

1. A method implemented in a first Wireless Transmit/Receive Unit (WTRU) using time-frequency (TF) resources for communications with a second WTRU in first and second directions, the method comprising:

obtaining, by the first WTRU, information associated with a communication with the second WTRU in the second direction;

determining or detecting, using the obtained information, a priority or a relative priority of one or more TF resources at TF locations for the communication in the second direction that correspond to one or more TF resources associated with the communication in the first direction; and

TF resource muting or symbol muting, by the WTRU, the one or more TF resources for the communication in the first direction based on the determined priority or the determined relative priority of the one or more TF resources for the communication in the second direction.

2. The method of claim 1, wherein the symbol muting of the one or more TF resources for the communication in the first direction includes shortening, by the first WTRU, one or more subframes associated with the one or more TF resources for the communication in the first direction based on the obtained information associated with the communication in the second direction.

3. The method of claim 1, wherein the information associated with the communication in the second direction includes the priority or the relative priority of any of:

(1) one or more Demodulation Reference Signals;

(2) one or more control channels;

(3) one or more resource elements;

or (4) one or more Resource Blocks for the communication in the second direction, the method further comprising;

determining a corresponding TF location or TF locations associated with the one or more TF resources for the communication in the first direction to be muted based on the priority or the relative priority,

wherein the TF resource muting or the symbol muting by the first WTRU includes muting the one or more TF resources at the corresponding TF location or TF locations for the communication in the first direction.

4. The method of claim 1, further comprising:

setting one or more subframes, as a Full Duplex (FD) subframes, that include FD TF resources; and

configuring the WTRU to receive at least a portion of the communication in the second direction while transmitting at least a portion of the communication in the first direction such that time intervals are established in which the communications in the first and second directions;

(1) overlap in frequency or (2) a first frequency or a first frequency band of the communication in the first direction is within a threshold of a second frequency or a second frequency band of the communication in the second direction.

5. The method of claim 1, wherein the TF resource muting or the symbol muting of the one or more TF resources for the communication in the first direction includes muting the one or more TF resources via any of:

(1) a blanking operation;

(2) a puncturing operation;

(3) a rate matching operation;

or (4) a transmission power control operation.

6. The method of claim 1, wherein the TF resource muting or the symbol muting of the one or more TF resources for the communication in the first direction includes adjusting a transmission power level (TPL) or TPLs between or among subsets of the TF resources associated with the communication in the first direction to any of:

(1) a zero power level, (2) a non-zero power level that is below a threshold level;

or (3) a power level relative to a power level of corresponding TF resources associated with the communication in the second direction.

7. The method of claim 1, wherein the TF resource muting or the symbol muting of the one or more TF resources for the communication in the first direction includes:

receiving an indication of a first Modulation and Coding Scheme (MCS) for a first subset of a plurality of TF resources and a second MCS for a second subset of the plurality of TF resources;

setting a transmission power level of the first subset of the TF resources to a different level relative to a transmission power level of the second subset of the TF resources based on the received indication; and

setting, based on the received indication, the first MCS, as an MCS for the first subset of the TF resources, and the second MCS, as an MCS for the second subset of the TF resources.

8. The method of claim 1, further comprising determining whether a subframe is potentially a self-interference subframe or potentially a neighbor-interference subframe, as a determined result, wherein the TF resource muting or the symbol muting of the one or more TF resources for the communication in the first direction is in accordance with the determined result.

9. The method of claim 1, further comprising mapping a signal to a plurality of TF resources for the communication in the first direction including the one or more TF resources to be muted, wherein the TF resource muting or the symbol muting of the one or more TF resources for the communication in the first direction includes puncturing the mapped TF resources at TF locations associated with the one or more TF resources to be muted.

10. The method of claim 1, wherein the TF resource muting or the symbol muting of the one or more TF resources for the communication in the first direction includes rate-matching to avoid mapping a plurality of TF resources at TF locations associated with the one or more TF resources to be muted.

11. The method of claim 1, wherein the TF resource muting or the symbol muting of the one or more TF resources for the communication in the first direction is conditioned on any of:

(1) a transmission power in the first direction being higher than a threshold;

(2) a Transport Block Size (TBS) of the one or more TF resources for the communication in the first direction exceeding a threshold;

(3) a Modulation and Coding Scheme (MCS) parameter of the one or more TF resources for the communication in the first direction exceeding a threshold; and

/or (4) a redundancy version of the one or more TF resources for the communication in the first direction exceeding a threshold.

12. The method of claim 1, wherein the one or more TF resources to be muted that are associated with the communication in the first direction are mapped to one or more parts of a subframe, the method further comprising transmitting one or more signals or reference signals (RSs) associated with the muted TF resources or a subset of the muted TF resources in one or more different parts of the subframe, as shifted TF signals, for the communication in the first direction.

13. The method of claims 1, wherein the TF resource muting or the symbol muting of the one or more TF resources for the communication in the first direction is conditioned on the one or more TF resources being located in any of:

(1) one or more particular TF locations;

(2) one or more TF locations in a center portion of a frequency band;

(3) one or more TF locations in an edge portion of the frequency band;

(4) a particular subframe;

(5) a subframe relative to signaling or an indication in an earlier subframe;

(6) a particular symbol;

or (7) a particular symbol relative to signaling or an indication in an earlier symbol.

14. The method of claim 1, wherein the determining of the priority or the relative priority of the one or more TF resources for communication in the second direction includes determining:

(1) one or more priorities for the one or more TF resources for the communication in the first direction;

or (2) one or more priorities for the one or more TF resources for the communication in the first direction relative to the one or more TF resources for the communication in the second direction based on any of;

(i) Quality of Service (QoS) parameters for one or more logical channels associated with the one or more TF resources of the communication in the first direction;

(ii) a number of retransmissions associated with one or a plurality of the one or more TF resources for the communication in the first direction; and

/or (iii) whether one or a plurality of the one or more TF resources for the communication in the first direction are for a retransmission of the communication in the first direction.

24. The method of claim 1, wherein:

the first WTRU is one of a base station or a terminal unit; and

the second WTRU is a different one of the base station or the terminal unit.

15. A Wireless Transmit/Receive Unit (WTRU) configured to use time-frequency (TF) resources for communications with a second WTRU in first and second directions, comprising:

a transmitter/receiver unit configured to transmit and receive communications; and

a processor configured to;

obtain information associated with the communication with the second WTRU in the second direction;

determine or detect, using the obtained information, a priority or a relative priority of one or more TF resources at TF locations for the communication in the second direction that correspond to one or more TF resources associated with the communication in the first direction; and

TF resource mute or symbol mute the one or more TF resources for the communication in the first direction based on the determined priority or the determined relative priority of the one or more TF resources for the communication in the second direction.

16. The WTRU of claim 15, wherein the processor is configured to shorten one or more subframes associated with the one or more TF resources for the communication in the first direction based on the determined priority or the determined relative priority of the one or more TF resources for the communication in the second direction.

17. The WTRU of claim 15, wherein:

the information associated with the communication in the second direction includes the priority or the relative priority of any of;

(1) one or more Demodulation Reference Signals;

(2) one or more control channels;

(3) one or more resource elements;

or (4) one or more Resource Blocks for the communication in the second direction; and

the processor is configured to;

determine a corresponding TF location or TF locations associated with the one or more TF resources for the communication in the first direction to be muted based on the priority or the relative priority, and

mute the one or more TF resources at the corresponding TF location or TF locations for the communication in the first direction.

18. The WTRU of claim 15, wherein:

the transmitter/receiver unit includes a full duplex transmitter/receiver unit; and

the full duplex transmitter/receiver unit and the processor are configured to mute the one or more TF resources for the communication in the first direction via any of;

(1) a blanking operation;

(2) a puncturing operation;

(3) a rate matching operation;

or (4) a transmission power control operation.

19. The WTRU of claim 15, wherein the processor is configured to adjust a transmission power level (TPL) or TPLs between or among subsets of the TF resources for the communication in the first direction to any of:

(1) a zero power level, (2) a non-zero power level that is below a threshold level;

or (3) a power level relative to a power level of corresponding TF resources associated with the communication in the second direction.

20. The VVTRU of claim 15, wherein:

the transmitter/receiver unit is configured to receive an indication of a first Modulation and Coding Scheme (MCS) for a first subset of a plurality of TF resources for the communication in the first direction and a second MCS for a second subset of the plurality of TF resources for the communication in the first direction; and

the processor is configured to;

set, based on the received indication, a transmission power level of the first subset of the TF resources to a different level relative to a transmission power level of the second subset of the TF resources, and

set, based on the received indication, the first MCS, as an MCS for the first subset of the TF resources, and the second MCS, as an MCS for the second subset of the TF resources.

21. The WTRU of claim 15, wherein the processor is configured to:

map a signal to a plurality of the TF resources for the communication in the first direction including the one or more TF resources to be muted; and

puncture the mapped TF resources at TF locations associated with the one or more TF resources.

22. The WTRU of claim 15, wherein the processor is configured to shift one or more signals or reference signals (RSs) associated with the muted TF resources for the communication in the first direction within a subframe to other TF resources that are not to be muted within the same subframe prior to a transmission of the shifted one or more signals or RSs.

23. The WTRU of claim 15, wherein the processor is configured to determine:

(1) one or more priorities for the one or more TF resources for the communication in the first direction or (2) one or more priorities for the one or more TF resources for the communication in the first direction relative to the one or more TF resources for the communication in the second direction based on any of;

(i) Quality of Service (QoS) parameters for one or more logical channels associated with the one or more TF resources of the communication in the first direction;

(ii) a number of retransmissions associated with one or a plurality of the one or more TF resources for the communication in the first direction;

(iii) whether one or a plurality of the one or more TF resources for the communication in the first direction are for a retransmission of the communication in the first direction.

25. The WTRU of claim 15, wherein:

the WTRU is one of a base station or a terminal unit; and

the second WTRU is a different one of the base station or the terminal unit.