PROVIDING MOBILE-GUIDED DOWNLINK INTERFERENCE MANAGEMENT

• US 20140024388A1
• Filed: 01/21/2011
• Published: 01/23/2014
• Est. Priority Date: 01/21/2011
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Earnshaw, Andrew Mark, Jin, Xin, Weng, Jianfeng
• Granted Patent: US 9,281,929 B2
• Time in Patent Office: Days
• US Class Current: 455/452.2
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

Systems and methods can be implemented on a user device and eNBs to manage downlink interference at the user device. The user device in a cell associated with a corresponding serving base station may receive interference from one or more interfering base stations. The user device can identify a preferred radio resource set in response to the detected interference and transmit a preferred radio resource indication to at least the serving base station in response to the detected interference. The preferred radio resource indication can be used for identifying the preferred radio resource set associated with the serving base station.

Claims

1. A method for managing downlink interference, the method executed on a user device, the method comprising:

receiving, at the user device, an interference, the user device operating in a cell associated with a corresponding serving base station, the interference received from one or more interfering base stations;

identifying a preferred radio resource set in response to the received interference; and

transmitting a preferred radio resource indication to at least the serving base station in response to the received interference, the preferred radio resource indication identifying the preferred radio resource set associated with the serving base station.

2. The method of claim 1 further comprising:

identifying at least one of the one or more interfering base stations; and

providing to at least the serving base station a measurement report in which the at least one of the one or more interfering base stations is identified in addition to transmitting the preferred radio resource indication.

3. The method of claim 1, wherein the preferred radio resource indication is transmitted, to at least the one or more interfering base stations, as part of an interference coordination report, the interference coordination report further including a transmit power change limit indication.

4. The method of claim 3, wherein the transmit power change limit indication requests the one or more interfering base stations to adjust a transmission power level associated with at least an identified radio resource subset of the preferred radio resource set.

5. The method of claim 3, wherein the transmit power change limit indication requests the one or more interfering base stations to discontinue transmitting on at least an identified radio resource subset of the preferred radio resource set during a defined time period which begins at a defined time, the method further comprising determining an interference floor associated with at least the identified radio resource subset of the preferred radio resource set while the one or more interfering base stations have discontinued transmitting on at least the identified radio resource subset of the preferred radio resource set.

6. The method of claim 1, wherein the preferred radio resource indication is transmitted by the user device to at least one of the one or more interfering base stations.

7. The method of claim 1, wherein the preferred radio resource set includes a plurality of preferred radio resource subsets.

8. The method of claim 7, wherein the preferred radio resource indication identifies at least one of the plurality of preferred radio resource subsets.

9. The method of claim 1, wherein identifying a preferred radio resource set includes:

identifying a channel power of a received signal for a first at least one resource set;

identifying an interference floor for the first at least one resource set;

identifying a received interference power from the one or more interfering base stations for the first at least one resource set;

identifying a relative interference quantity based on the received interference power from the one or more interfering base stations for the first at least one resource set and the interference floor for the first at least one resource set; and

if the relative interference quantity is more than a first threshold value, identifying the preferred radio resource set as a second at least one resource set.

10. The method of claim 9, wherein identifying a received interference power from the one or more interfering base stations is based, at least in part, on data active reference signals in signals received, at the user device, from the one or more interfering base stations.

11. The method of claim 9, wherein transmitting a preferred radio resource indication further includes:

identifying a channel power of a received signal for the second at least one resource set;

identifying an interference floor for the second at least one resource set;

identifying a received interference power from the one or more interfering base stations for the second at least one resource set;

determining a first channel quality indicator value for the second at least one resource set, the first channel quality indicator value based on at least one of the channel power of the received signal for the second at least one resource set, the interference floor for the second at least one resource set, and the received interference power from the one or more interfering base stations for the second at least one resource set; and

if the first channel quality indicator value is greater than a second threshold value, transmitting a preferred radio resource indication identifying the preferred radio resource set as the second at least one resource set.

12. The method of claim 11, further comprising:

if the first channel quality indicator value is less than or equal to the second threshold value, calculating a second channel quality indicator value for the second at least one resource set, the second channel quality indicator value determined based on at least the interference floor for the second at least one resource set; and

if the second channel quality indicator value exceeds a third threshold value, transmitting the preferred radio resource indication identifying the preferred radio resource set as the second at least one resource set and transmitting a transmit power limit change indication requesting the one or more interfering base stations to adjust a transmission power level associated with at least an identified radio resource subset of the second at least one resource set.

13. The method of claim 1, wherein the preferred radio resource set for the serving base station may be different from the preferred radio resource set for at least one of the one or more interfering base stations.

14. The method of claim 1, wherein the preferred radio resource indication is encoded prior to being transmitted to at least the serving base station.

15. The method of claim 1, wherein the preferred radio resource indication is transmitted with a channel quality indication report.

16. The method of claim 1, wherein the interference is received from one or more interfering base stations and one or more devices different from base stations.

17. An apparatus for managing downlink interference, the apparatus operating in a cell associated with a corresponding serving base station and comprising:

an antenna;

a memory; and

at least one hardware processor, the hardware processor operable to execute instructions to;

receive an interference, the interference received from one or more interfering base stations;

identify a preferred radio resource set associated with the serving base station in response to the received interference; and

transmit a preferred radio resource indication to at least the serving base station in response to the received interference, the preferred radio resource indication identifying the preferred radio resource set associated with the serving base station.

18. The apparatus of claim 17, wherein the preferred radio resource indication is transmitted as part of an interference coordination report, the interference coordination report further including a transmit power change limit indication.

19. The apparatus of claim 18, wherein the transmit power change limit indication requests the one or more interfering base stations to adjust a transmission power level associated with at least an identified radio resource subset of the preferred radio resource set.

20. The apparatus of claim 18, wherein the transmit power change limit indication requests the one or more interfering base stations to discontinue transmitting on at least an identified subset radio resource of the preferred radio resource set;

the method further comprising determining an interference floor associated with at least the subset radio resource of the preferred radio resource set while the one or more interfering base stations have discontinued transmitting on at least the radio resource subset of the preferred radio resource set.

21. The apparatus of claim 17, wherein the apparatus is operable to transmit the preferred radio resource indication to at least one of the one or more interfering base stations.

22. A system comprising:

a base station in communication with a first mobile electronic device, the base station operable to;

receive a radio resource indication from the first mobile electronic device, the radio resource indication identifying a preferred radio resource set, the preferred radio resource set including one or more preferred radio resource subsets; and

process the radio resource indication to allocate one or more preferred radio resource subsets to the first mobile electronic device.

23. The system of claim 22, wherein the base station is an evolved Node B.

24. The system of claim 22, wherein the radio resource indication identifies one or more preferred radio resource subsets being requested by the first mobile electronic device.

25. The system of claim 22, wherein the base station is a serving base station, and the system further comprises:

one or more interfering base stations, the one or more interfering base stations are operable to;

receive the radio resource indication and a transmit power change limit indication from the first mobile electronic device; and

adjust a transmission power level associated with the one or more preferred radio resource subsets associated with the preferred radio resource set identified by the radio resource indication.

26. The system of claim 22, wherein the base station is a serving base station, and the system further comprises:

one or more interfering base stations, the one or more interfering base stations are operable to;

receive from the serving base station the radio resource indication and a transmit power change limit indication for the first mobile electronic device; and

adjust a transmission power level associated with the one or more preferred radio resource subsets associated with the preferred radio resource set identified by the radio resource indication.

27. The system of claim 22, wherein the base station is further operable to transmit at least one of a set of cell-specific reference signals or a set of data active reference signals.

28. The system of claim 26, wherein transmitting a set of data active reference signals comprises:

generating the data active reference signals based, at least in part, on a cell-specific pseudo-random binary sequence; and

transmitting data active reference signals in resource blocks assigned for downlink transmission to at least one of the first mobile electronic device and a second mobile electronic device.