DRX wakeup rule in an eICIC environment
Methods, systems, and devices are described for a UE to determine a DRX wakeup rule in an eICIC environment. A UE may identify a measurement period associated with reduced interference from one or more cells in a wireless communications network. The cells may be a serving cell or a neighbor cell. The measurement period may be identified based on eICIC data available to the UE. The eICIC data may be sent to the UE by a serving cell and/or determined by the UE. The UE may power up a wireless modem to perform a warm-up measurement of the serving cell during the identified measurement period prior to transitioning the UE to a DRX on state.
1. A method for wireless communication comprising:
identifying, by a user equipment (UE) associated with a serving cell, measurement period opportunities during a discontinuous reception (DRX) off period, wherein the DRX off period precedes a DRX on period, and wherein the measurement period opportunities are associated with reduced interference from one or more neighboring cells in a wireless communications network;
prioritizing the measurement period opportunities based at least in part on enhanced inter-cell interference coordination (eICIC) data available to the UE and a location of the measurement period relative to a start of the DRX on period; and
powering up a wireless modem of the UE to perform a warm-up measurement of the serving cell during a measurement period of the prioritized measurement period opportunities.
2. The method of claim 1 , further comprising:
receiving at least a portion of the eICIC data by the UE from the serving cell.
3. The method of claim 2 , wherein receiving at least the portion of the eICIC data from the serving cell comprises:
receiving a measurement subframe pattern associated with channel state information measurements of the serving cell.
4. The method of claim 1 , further comprising:
determining at least a portion of the eICIC data by the UE.
5. The method of claim 4 , wherein determining at least the portion of the eICIC data by the UE further comprises:
determining an almost-blank signal (ABS) pattern associated with the one or more neighboring cells in the wireless communications network.
6. The method of claim 5 , further comprising:
measuring an interference pattern from the one or more neighboring cells over a period of time;
wherein the ABS pattern is based on the measured interference pattern.
7. The method of claim 4 , wherein determining at least the portion of the eICIC data by the UE further comprises:
determining, during reception of a subframe, that the subframe comprises an ABS subframe.
8. The method of claim 1 , wherein the measurement period of the measurement periods is identified based at least in part on one or more of a DRX offset associated with the UE, a DRX periodicity associated with the UE, a DRX on duration associated with the UE, a Doppler estimate measured by the UE, or an SNR estimate measured by the UE.
9. The method of claim 1 , further comprising:
identifying a dominant interfering cell of the UE; and
wherein identifying the measurement period of the measurement periods is identified based on a parameter of the dominant interfering cell.
10. The method of claim 9 , wherein the parameter of the dominant interfering cell comprises one or more of a reference signal location or a signal strength.
11. The method of claim 1 , further comprising:
identifying a reference signal collision among a plurality of the one or more neighboring cells in the wireless communications network;
wherein the measurement period of the measurement periods is identified based at least in part on the reference signal collision.
12. The method of claim 11 , wherein the measurement period is located within an almost-blank signal (ABS) subframe that immediately precedes a subframe associated with transitioning to the DRX on state.
13. The method of claim 1 , further comprising:
comparing one or more parameters measured by the UE for different cells;
wherein the measurement period of the measurement periods is identified based on the comparison of the one or more parameters.
14. The method of claim 13 , wherein the one or more parameters comprise one or more of a Doppler evolution, a timing error, or a frequency error associated with each of the one or more neighboring cells.
15. An apparatus for wireless communications comprising:
a processor;
memory in electronic communication with the processor; and
instructions being executed by the processor to:
identify, by a user equipment (UE) associated with a serving cell, measurement period opportunities during a discontinuous reception (DRX off period, wherein the DRX off period precedes a DRX on period, and wherein the measurement period opportunities are associated with reduced interference from one or more neighboring cells in a wireless communications network;
prioritize the measurement period opportunities based at least in part on enhanced inter-cell interference coordination (eICIC) data available to the UE and a location of the measurement period relative to a start of the DRX on period; and
power up a wireless modem of the UE to perform a warm-up measurement of the serving cell during a measurement period of the prioritized measurement period opportunities.
16. The apparatus of claim 15 , further comprising:
instructions to receive at least a portion of the eICIC data by the UE from the serving cell; and
instructions to receive a measurement subframe pattern associated with channel state information measurements of the serving cell.
17. The apparatus of claim 15 , further comprising instructions to:
determine at least a portion of the eICIC data by the UE.
18. The apparatus of claim 17 , wherein the instructions to determine at least the portion of the eICIC data by the UE further comprises instructions to:
determine an almost-blank signal (ABS) pattern associated with the one or more neighboring cells in the wireless communications network.
19. The apparatus of claim 18 , further comprising instructions to:
measure an interference pattern from the one or more neighboring cells over a period of time;
wherein the ABS pattern is based on the measured interference pattern.
20. The apparatus of claim 17 , wherein the instructions to determine at least the portion of the eICIC data by the UE further comprises instructions to:
determine, during reception of a subframe, that the subframe comprises an ABS subframe.
21. An apparatus for wireless communication comprising:
means for identifying, by a user equipment (UE) associated with a serving cell, measurement period opportunities during a discontinuous reception 9DRX) off period, wherein the DRX off period precedes a DRX on period, and wherein the measurement period opportunities are associated with reduced interference from one or more neighboring cells in a wireless communications network;
means for prioritizing the measurement period opportunities are identified based at least in part on enhanced inter-cell interference coordination (eICIC) data available to the UE and a location of the measurement period relative to a start of the DRX on period; and
means for powering up a wireless modem of the UE to perform a warm-up measurement of the serving cell a measurement period of the prioritized measurement period opportunities.
22. The apparatus of claim 21 , further comprising:
means for receiving at least a portion of the eICIC data by the UE from the serving cell; and
means for receiving a measurement subframe pattern associated with channel state information measurements of the serving cell.
23. The apparatus of claim 21 , further comprising:
means for determining at least a portion of the eICIC data by the UE.
24. The apparatus of claim 23 , wherein the means for determining at least the portion of the eICIC data by the UE further comprises:
means for determining an almost-blank signal (ABS) pattern associated with the one or more neighboring cells in the wireless communications network.
25. The apparatus of claim 24 , further comprising:
means for measuring an interference pattern from the one or more neighboring cells over a period of time;
wherein the ABS pattern is based on the measured interference pattern.
26. A computer program product for wireless communication, the computer program product comprising a non-transitory computer-readable medium storing instructions executable by a processor to:
identify, by a user equipment (UE) associated with a serving cell, measurement period opportunities during a discontinuous reception 9DRX) off period, wherein the DRX off period precedes a DRX on period, and wherein the measurement period opportunities are associated with reduced interference from one or more neighboring cells in a wireless communications network;
prioritize the measurement period opportunities based at least in part on enhanced inter-cell interference coordination (eICIC) data available to the UE and a location of the measurement period relative to a start of the DRX on period; and
power up a wireless modem of the UE to perform a warm-up measurement of the serving cell during a measurement period of the prioritized measurement period opportunities.