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1. (WO2010077192) SUBCELL MEASUREMENT PROCEDURES IN A DISTRIBUTED ANTENNA SYSTEM
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CLAIMS What is claimed is:

1. A method, in a wireless terminal served by a serving cell in a wireless communication system utilizing coordinated multipoint transmission from two or more subcells in each of a plurality of cells, of reporting downlink signal measurement information, characterized in that the method comprises: monitoring (410) signal quality metrics for a first set of downlink signals comprising a first common channel signal transmitted from two or more subcells of a neighbor cell; evaluating (430) the monitored signal quality metrics; selectively increasing (450) a measurement rate, an event evaluation rate, or both, for at least a first subcell-specific signal from the neighbor cell, based on said evaluating; and reporting (460) signal quality data based on the first subcell-specific signal to a serving base station.

2. The method of claim 1 , further characterized in that selectively increasing (450) the measurement rate, event evaluation rate, or both, comprises increasing the measurement rate for the first subcell-specific signal from a first rate to a second rate, wherein the first rate is greater than zero.

3. The method of claim 1 , further characterized in that selectively increasing (450) the measurement rate, event evaluation rate, or both, comprises increasing the measurement rate for the first subcell-specific signal from zero to a non-zero measurement rate.

4. The method of any of claims 1 to 3, further characterized in that the reported signal quality data based on the first subcell-specific signal comprises measured signal quality data for the first subcell-specific signal.

5. The method of any of claims 1 to 3, further characterized in that the reported signal quality data based on the first subcell-specific signal comprises event evaluation results based on the first subcell-specific signal.

6. The method of claim 1 , further characterized in that evaluating (430) the monitored signal quality metrics comprises comparing (520) a measured signal quality for the first common channel signal to a predetermined threshold, wherein the measurement rate for the first subcell-specific signal is increased (530) if the measured signal quality exceeds the predetermined threshold.

7. The method of claim 1 wherein the first set of signals further comprises at least a second common channel signal transmitted from two or more subcells of the serving cell, the method further characterized in that evaluating (430) the monitored signal quality metrics comprises comparing (630) a first quality metric for the first common channel signal to a second quality metric for the second common channel, wherein the measurement rate for the first subcell-specific signal is increased (640) if the difference between the first and second measured quality metrics exceeds a predetermined threshold.

8. The method of claim 1 wherein the first set of signals further comprises at least two subcell-specific signals from the neighbor cell, the method further characterized in that evaluating the monitored signal quality metrics comprises comparing (720) an aggregate signal quality for two or more of the at least two subcell-specific signals from the neighbor cell to a predetermined threshold, wherein the measurement rate for the first subcell-specific signal is increased if the aggregate signal quality is above the predetermined threshold.

9. The method of claim 1 wherein the first set of signals further comprises at least two subcell-specific signals from the neighbor cell, the method further characterized in that evaluating the monitored signal quality metrics comprises comparing (720) an aggregate signal quality for two or more of the at least two subcell-specific signals from the neighbor cell to a predetermined threshold, wherein the event evaluation rate for at least one event related to the first subcell-specific signal is increased if the aggregate signal quality is above the predetermined threshold.

10. The method of claim 1 wherein the first set of signals further comprises at least two subcell-specific signals from the neighbor cell, the method further characterized in that evaluating the monitored signal quality metrics comprises comparing (830) an aggregate signal quality for two or more of the at least two subcell-specific signals from the neighbor cell to a second signal quality for the first common channel signal, wherein the measurement rate for the first subcell-specific signal is increased if the difference between the aggregate signal quality and the second signal quality exceeds a predetermined threshold.

11. The method of claim 1 wherein the first set of signals further comprises at least two subcell-specific signals from the neighbor cell and a second common channel signal transmitted from two or more subcells of the serving cell, the method further characterized in that evaluating the monitored signal quality metrics comprises comparing (930) an aggregate signal quality for two or more of the at least two subcell-specific signals from the neighbor cell to a second signal quality for the second common channel signal, wherein the measurement rate for the first subcell-specific signal is increased if the difference between the aggregate signal quality and the second signal quality exceeds a predetermined threshold.

12. The method of claim 1 wherein the first set of signals further comprises at least two subcell-specific signals from the neighbor cell, the method further characterized in that evaluating the monitored signal quality metrics comprises comparing (830) an aggregate signal quality for two or more of the at least two subcell-specific signals from the neighbor cell to a second signal quality for the first common channel signal, wherein the event evaluation rate for at least one event related to the first subcell-specific signal is increased if the difference between the aggregate signal quality and the second signal quality exceeds a predetermined threshold.

13. The method of claim 1 wherein the first set of signals further comprises at least two subcell-specific signals from the neighbor cell and a second common channel signal transmitted from two or more subcells of the serving cell, the method further characterized in that evaluating the monitored signal quality metrics comprises comparing (930) an aggregate signal quality for two or more of the at least two subcell-specific signals from the neighbor cell to a second signal quality for the second common channel signal, wherein the event evaluation rate for at least one event related to the first subcell-specific signal is increased if the difference between the aggregate signal quality and the second signal quality exceeds a predetermined threshold.

14. The method of claim 1 wherein the first set of signals further comprises at least one subcell-specific signal from the neighbor cell, the method further characterized in that evaluating the monitored signal quality metrics comprises comparing (1030) a first signal quality for the one of the at least one subcell-specific signals from the neighbor cell to a second signal quality for the first common channel signal, wherein the measurement rate for the first subcell-specific signal is increased if the difference between the first signal quality and the second signal quality exceeds a predetermined threshold.

15. The method of claim 1 wherein the first set of signals further comprises at least one subcell-specific signal from the neighbor cell, the method further characterized in that evaluating the monitored signal quality metrics comprises comparing (1030) a first signal quality for the one of the at least one subcell-specific signals from the neighbor cell to a second signal quality for the first common channel signal, wherein the event evaluation rate for at least one event related to the first subcell-specific signal is increased if the difference between the first signal quality and the second signal quality exceeds a predetermined threshold.

16. The method of claim 1 wherein the first set of signals further comprises at least one subcell-specific signal from the neighbor cell and a second common channel signal transmitted from two or more subcells of the serving cell, the method further characterized in that evaluating the monitored signal quality metrics comprises comparing (1130) a first signal quality for the one of the at least one subcell-specific signals from the neighbor cell to a second signal quality for the second common channel signal, wherein the measurement rate for the first subcell-specific signal is increased if the difference between the first signal quality and the second signal quality exceeds a predetermined threshold.

17. The method of claim 1 wherein the first set of signals further comprises at least one subcell-specific signal from the neighbor cell and a second common channel signal transmitted from two or more subcells of the serving cell, the method further characterized in that evaluating the monitored signal quality metrics comprises comparing (1130) a first signal quality for the one of the at least one subcell-specific signals from the neighbor cell to a second signal quality for the second common channel signal, wherein the event evaluation rate for at least one event related to the first subcell-specific signal is increased if the difference between the first signal quality and the second signal quality exceeds a predetermined threshold.

18. The method of any of claims 1 to 17, wherein the signal quality metrics for the first common channel signal comprise at least one of: a received signal strength, RSS; a signal-to-interference-plus-noise ratio, SINR; a reference signal received power, RSRP; and a reference signal received quality, RSRQ.

19. The method of any of claims 1 to 18, wherein the first common channel signal comprises one or more of: a common synchronization channel, SCH; common reference signals, CRS; and a broadcast channel.

20. The method of any of claims 6 - 17, further characterized in that the method further comprises receiving the predetermined threshold from the serving cell at the wireless terminal.

21. A wireless communication device (300) for use in a wireless communication system utilizing coordinated multipoint transmission from two or more subcells in each of a plurality of cells, the wireless communication device (300) comprising receiver circuitry (320) configured to receive downlink signals from a serving cell and one or more neighbor cells, transmitter circuitry (330) configured to transmit uplink signals to a serving base station, and signal processing circuitry (340), characterized in that the signal processing circuitry is configured to: monitor signal quality metrics for a first set of downlink signals received via the receiver circuitry, the first set of downlink signals including a first common channel signal transmitted from two or more subcells of a neighbor cell; evaluate the monitored signal quality metrics; selectively increase a measurement rate, an event evaluation rate, or both, for at least a first subcell-specific signal from the neighbor cell based on said evaluation; and report signal quality data based on the first subcell-specific signal to a serving base station, via the transmitter circuitry.

22. The wireless communication device (300) of claim 21 , further characterized in that the signal processing circuitry (340) is configured to increase the measurement rate for the first subcell-specific signal from a first, non-zero, rate to a second rate, based on said evaluation.

23. The wireless communication device (300) of claim 21 , further characterized in the signal processing circuitry (340) is configured to increase the measurement rate for the first subcell-specific signal from zero to a non-zero measurement rate, based on said evaluation.

24. The wireless communication device (300) of any of claims 21 to 23, further characterized in that the signal processing circuitry (340) is configured to report measured signal quality data for the first subcell-specific signal.

25. The wireless communication device (300) of claims 21 to 23, further characterized in that the signal processing circuitry (340) is configured to report signal quality data based on the first subcell-specific signal by reporting event evaluation results based on the first subcell-specific signal.

26. The wireless communication device (300) of claim 21 , further characterized in that the signal processing circuitry (340) is configured to evaluate the monitored signal quality metrics by comparing a measured signal quality for the first common channel signal to a predetermined threshold, and to increase the measurement rate for the first subcell-specific signal if the measured signal quality exceeds the predetermined threshold.

27. The wireless communication device (300) of claim 21 wherein the first set of signals further comprises at least a second common channel signal transmitted from two or more subcells of the serving cell, and further characterized in that the signal processing circuitry (340) is configured to evaluate the monitored signal quality metrics by comparing a first quality metric for the first common channel signal to a second quality metric for the second common channel, and to increase the measurement rate for the first subcell-specific signal if the difference between the first and second measured quality metrics exceeds a predetermined threshold.

28. The wireless communication device (300) of claim 21 wherein the first set of signals further comprises at least two subcell-specific signals from the neighbor cell, and further characterized in that the signal processing circuitry (340) is configured to evaluate the monitored signal quality metrics by comparing an aggregate signal quality for two or more of the at least two subcell-specific signals from the neighbor cell to a predetermined threshold, and to increase the measurement rate for the first subcell-specific signal if the aggregate signal quality is above the predetermined threshold.

29. The wireless communication device (300) of claim 21 wherein the first set of signals further comprises at least two subcell-specific signals from the neighbor cell, and further characterized in that the signal processing circuitry (340) is configured to evaluate the monitored signal quality metrics by comparing an aggregate signal quality for two or more of the at least two subcell-specific signals from the neighbor cell to a predetermined threshold, and to increase the event evaluation rate for at least one event related to the first subcell-specific signal if the aggregate signal quality is above the predetermined threshold.

30. The wireless communication device (300) of claim 21 wherein the first set of signals further comprises at least two subcell-specific signals from the neighbor cell, and further characterized in that the signal processing circuitry (340) is configured to evaluate the monitored signal quality metrics by comparing an aggregate signal quality for two or more of the at least two subcell-specific signals from the neighbor cell to a second signal quality for the first common channel signal, and to increase the measurement rate for the first subcell-specific signal if the difference between the aggregate signal quality and the second signal quality exceeds a predetermined threshold.

31. The wireless communication device (300) of claim 21 wherein the first set of signals further comprises at least two subcell-specific signals from the neighbor cell and a second common channel signal transmitted from two or more subcells of the serving cell, and further characterized in that the signal processing circuitry (340) is configured to evaluate the monitored signal quality metrics by comparing an aggregate signal quality for two or more of the at least two subcell-specific signals from the neighbor cell to a second signal quality for the second common channel signal, and to increase the measurement rate for the first subcell-specific signal if the difference between the aggregate signal quality and the second signal quality exceeds a predetermined threshold.

32. The wireless communication device (300) of claim 21 wherein the first set of signals further comprises at least two subcell-specific signals from the neighbor cell, and further characterized in that the signal processing circuitry (340) is configured to evaluate the monitored signal quality metrics by comparing an aggregate signal quality for two or more of the at least two subcell-specific signals from the neighbor cell to a second signal quality for the first common channel signal, and to increase the event evaluation rate for at least one event related to the first subcell-specific signal if the difference between the aggregate signal quality and the second signal quality exceeds a predetermined threshold.

33. The wireless communication device (300) of claim 21 wherein the first set of signals further comprises at least two subcell-specific signals from the neighbor cell and a second common channel signal transmitted from two or more subcells of the serving cell, and further characterized in that the signal processing circuitry (340) is configured to evaluate the monitored signal quality metrics by comparing an aggregate signal quality for two or more of the at least two subcell-specific signals from the neighbor cell to a second signal quality for the second common channel signal, and to increase the event evaluation rate for at least one event related to the first subcell-specific signal if the difference between the aggregate signal quality and the second signal quality exceeds a predetermined threshold.

34. The wireless communication device (300) of claim 21 wherein the first set of signals further comprises at least one subcell-specific signal from the neighbor cell, and further characterized in that the signal processing circuitry (340) is configured to evaluate the monitored signal quality metrics by comparing a first signal quality for the one of the at least one subcell-specific signals from the neighbor cell to a second signal quality for the first common channel signal, and to increase the measurement rate for the first subcell-specific signal if the difference between the first signal quality and the second signal quality exceeds a predetermined threshold.

35. The wireless communication device (300) of claim 21 wherein the first set of signals further comprises at least one subcell-specific signal from the neighbor cell, and further characterized in that the signal processing circuitry (340) is configured to evaluate the monitored signal quality metrics by comparing a first signal quality for the one of the at least one subcell-specific signals from the neighbor cell to a second signal quality for the first common channel signal, and to increase the event evaluation rate for at least one event related to the first subcell-specific signal if the difference between the first signal quality and the second signal quality exceeds a predetermined threshold.

36. The wireless communication device (300) of claim 21 wherein the first set of signals further comprises at least one subcell-specific signal from the neighbor cell and a second common channel signal transmitted from two or more subcells of the serving cell, and further characterized in that the signal processing circuitry (340) is configured to evaluate the monitored signal quality metrics by comparing a first signal quality for the one of the at least one subcell-specific signals from the neighbor cell to a second signal quality for the second common channel signal, and to increase the measurement rate for the first subcell-specific signal if the difference between the first signal quality and the second signal quality exceeds a predetermined threshold.

37. The wireless communication device (300) of claim 21 wherein the first set of signals further comprises at least one subcell-specific signal from the neighbor cell and a second common channel signal transmitted from two or more subcells of the serving cell, and further characterized in that the signal processing circuitry (340) is configured to evaluate the monitored signal quality metrics by comparing a first signal quality for the one of the at least one subcell-specific signals from the neighbor cell to a second signal quality for the second common channel signal, and to increase the event evaluation rate for at least one event related to the first subcell-specific signal if the difference between the first signal quality and the second signal quality exceeds a predetermined threshold.

38. A wireless base station system (1200) for use in a wireless communication system utilizing coordinated multipoint transmission from two or more subcells in each of a plurality of cells, the wireless base station (1200) comprising a base station transceiver (1220) and a control unit (1210), characterized in that the control unit (1210) is configured to: transmit measurement configuration information to one or more mobile terminals, using the base station transceiver (1220), the measurement configuration information corresponding to at least one common channel signal transmitted from two or more subcells of a neighbor cell and at least a first subcell-specific signal of the neighbor cell; receive, via the base station transceiver (1220), signal quality data reported by one or more of the mobile terminals, the signal quality comprising measurement data, an event report, or both, corresponding to at least a second subcell-specific signal for which measurement configuration information was not transmitted.

39. The base station (1200) of claim 38, further characterized in that the measurement configuration information comprises measurement threshold data corresponding to one or more of the at least one common channel signal and at least one subcell-specific signal of the neighbor cell.

40. The base station (1200) of claim 38 or 39, further characterized in that the measurement configuration information comprises event trigger information corresponding to one or more of the at least one common channel signal and at least one subcell-specific signal of the neighbor cell.

41. The base station (1200) of any of claims 38 to 40, further characterized in that the measurement configuration information specifies at least one criterion to the one or more mobile terminals for selectively increasing a measurement rate, an event evaluation rate, or both, for the second subcell-specific signal from the neighbor cell, based on an evaluation of the common channel signal transmitted from two or more subcells of a neighbor cell and the first subcell-specific signal of the neighbor cell.