Measuring multiple carriers under discontinuous activity

1. A method in a wireless device capable of operating in discontinuous activity mode, the method comprising:

determining that the wireless device is configured with a discontinuous reception (DRX) cycle longer than a DRX threshold;

obtaining a reduced measurement group comprising a first set of one or more cells or carriers to be measured;

comparing a signal level of the serving cell at the wireless device with a signal threshold;

when the signal level of the serving cell at the wireless device is below the signal threshold, performing a measurement on the first set of one or more cells or carriers of the reduced measurement group; and

when the signal level of the serving cell at the wireless device is equal to or above the signal threshold, performing a measurement on a second set of a plurality of cells or carriers of a normal measurement group, and

wherein the first set of the one or more cells or carriers of the reduced measurement group is less than the second set of the plurality of cells or carriers of the normal measurement group.

2. The method of claim 1 , further comprising:

obtaining the normal measurement group comprising the second set of the plurality of cells or carriers to be measured.

3. The method of claim 1 , further comprising performing an operational task using a measurement result of at least one of the measurements on the first set of one or more cells or carriers of the reduced measurement group or one of the measurements on the second set of the plurality of cells or carriers of the normal measurement group.

4. A method in a network node capable of operating in discontinuous activity mode, the method comprising:

receiving, from a wireless device, a measurement result of at least one of:

a measurement on a first set of one or more cells or carriers comprising a reduced measurement group if a signal level of a serving cell at the wireless device is below a signal threshold; or

a measurement on a second set of a plurality of cells or carriers comprising a normal measurement group if the signal level of the serving cell at the wireless device is equal to or above the signal threshold; and

performing an operational task using the received measurement result, and

wherein the first set of the one or more cells or carriers of the reduced measurement group is less than the second set of the plurality of cells or carriers of the normal measurement group.

5. The method of claim 4 , further comprising:

obtaining an indication that the wireless device is configured with a discontinuous reception (DRX) cycle longer than a DRX threshold; and

transmitting, to the wireless device, a configuration including at least one of:

the reduced measurement group, the reduced measurement group comprising the first set of one or more cells or carriers to be measured; and

the normal measurement group, the normal measurement group comprising the second set of the plurality of cells or carriers to be measured.

6. A wireless device capable of operating in discontinuous activity mode, the wireless device comprising processing circuitry, the processing circuitry operable to:

determine that the wireless device is configured with a discontinuous reception (DRX) cycle longer than a DRX threshold;

obtain a reduced measurement group comprising a first set of one or more cells or carriers to be measured;

compare a signal level of the serving cell at the wireless device with a signal threshold;

when the signal level of the serving cell at the wireless device is below the signal threshold, perform a measurement on the first set of one or more cells or carriers of the reduced measurement group; and

when the signal level of the serving cell at the wireless device is equal to or above the signal threshold, performing a measurement on a second set of a plurality of cells or carriers of a normal measurement group, and

wherein the first set of the one or more cells or carriers of the reduced measurement group is less than the second set of the plurality of cells or carriers of the normal measurement group.

7. The wireless device of claim 6 , the processing circuitry further operable to:

obtain the normal measurement group comprising the second set of one or more cells or carriers to be measured.

8. The wireless device of claim 6 , the processing circuitry further operable to perform an operational task using a measurement result of at least one of the measurements on the first set of one or more cells or carriers of the reduced measurement group or one of the measurements on the second set of the plurality of cells or carriers of the normal measurement group.

9. The wireless device of claim 8 , wherein the operational task comprises performing cell reselection.

10. The wireless device of claim 6 , wherein the processing circuitry is operable to determine the wireless device is configured with the DRX cycle longer than a DRX threshold of 20.48 seconds.

11. The wireless device of claim 7 , wherein the processing circuitry is operable to obtain the normal measurement group and obtain the reduced measurement group by at least one of receiving a measurement group configuration from a network node, obtaining a pre-defined configuration of the wireless device, or determining autonomously.

12. The wireless device of claim 7 , the processing circuitry further operable to:

obtain a normal set of one or more time resources to use for measurement and a normal set of one or more measurements;

obtain a reduced set of one or more time resources to use for measurement and a reduced set of one or more measurements;

perform the measurement on the second set of the plurality of cells or carriers of the normal measurement group by performing at least one measurement of the normal set of one or more measurement types using at least one time resource of the normal set of one or more time resources; and

perform the measurement on the first set of one or more cells or carriers of the reduced measurement group by performing at least one measurement of the reduced set of one or more measurement types using at least one time resource of the reduced set of one or more time resources.

13. The wireless device of claim 6 , wherein the signal level of the serving cell at the wireless device includes a receive level (Srxlev) and a quality (Squal), and the signal threshold is 3 dB for at least one of Srxlev and Squal.

14. The wireless device of claim 6 , wherein the processing circuitry is operable to perform the measurement on the first set of one or more cells or carriers of the reduced measurement group by measuring common pilot channel (CPICH) Ec/Io and CPICH received signal code power (RSCP) at least two times during a paging transmission window (PTW) cycle in every DRX cycle length.

15. The wireless device of claim 7 , wherein the processing circuitry is operable to perform the measurement on the first set of one or more cells or carriers of the reduced measurement group at a first measurement rate and perform the measurement on the second set of the plurality of cells or carriers of the normal measurement group at a second measurement rate, the second measurement rate lower than the first measurement rate.

16. The wireless device of claim 7 , wherein the reduced measurement group comprises a set of one or more cells or carriers S 1 and the normal measurement group comprises a set of one or more cells or carriers S 1 +S 2 .

17. A network node capable of operating in discontinuous activity mode, the network node comprising processing circuitry, the processing circuitry operable to:

receive, from a wireless device, a measurement result of at least one of:

a measurement on a first set of one or more cells or carriers comprising a reduced measurement group if a signal level of a serving cell at the wireless device is below a signal threshold; or

a measurement on a second set of a plurality of cells or carriers comprising a normal measurement group if the signal level of the serving cell at the wireless device is equal to or above the signal threshold; and

perform an operational task using the received measurement result, and

wherein the first set of the one or more cells or carriers of the reduced measurement group is less than the second set of the plurality of cells or carriers of the normal measurement group.

18. The network node of claim 17 , the processing circuitry further operable to:

obtain an indication that the wireless device is configured with a discontinuous reception (DRX) cycle longer than a DRX threshold; and

transmit, to the wireless device, a configuration including at least one of:

the reduced measurement group, the reduced measurement group comprising the first set of one or more cells or carriers to be measured; and

the normal measurement group, the normal measurement group comprising the second set of the plurality of cells or carriers to be measured.

19. The network node of claim 17 , wherein the processing circuitry is operable to determine the wireless device is configured with the DRX cycle longer than a DRX threshold of 20.48 seconds.

20. The network node of claim 17 , wherein the configuration for the reduced measurement group comprises a first measurement rate and the configuration for the normal measurement group comprises a second measurement rate, the second measurement rate higher than the first measurement rate.

21. A wireless device capable of operating in discontinuous activity mode, the wireless device comprising a measuring module and a receiving module:

the measuring module is operable to determine that the wireless device is configured with a discontinuous reception (DRX) cycle longer than a DRX threshold;

the receiving module is operable to obtain a reduced measurement group comprising a first set of one or more cells or carriers to be measured;

the measuring module is further operable to:

compare a signal level of the serving cell at the wireless device with a signal threshold;

when the signal level of the serving cell at the wireless device is below the signal threshold, perform a measurement on the set of one or more cells or carriers of the reduced measurement group; and

when the signal level of the serving cell at the wireless device is equal to or above the signal threshold, perform a measurement on a second set of a plurality of cells or carriers of a normal measurement group, and

wherein the first set of the one or more cells or carriers of the reduced measurement group is less than the second set of the plurality of cells or carriers of the normal measurement group.

22. A network node capable of operating in discontinuous activity mode, the network node comprising a receiving module and a communication module:

the receiving module is operable to receive, from a wireless device, a measurement result of at least one of:

a measurement on a first set of one or more cells or carriers comprising a reduced measurement group if a signal level of a serving cell at the wireless device is below a signal threshold; or

a measurement on a second set of a plurality of cells or carriers comprising a normal measurement group if the signal level of the serving cell at the wireless device is equal to or above the signal threshold; and

the communication module is operable to perform an operational task using the received measurement result, and

wherein the first set of the one or more cells or carriers of the reduced measurement group is less than the second set of the plurality of cells or carriers of the normal measurement group.