Methods and system for resource management in TTI (transmission time interval) bundling for improved phase continuity
Certain aspects of the present disclosure propose methods for improving phase continuity in an uplink transmit time interval (TTI) bundle. A first method may include identifying a segment of UL subframes in the TTI bundle and maintaining substantially the same transmit power/timing/frequency when transmitting data to a node over the segment of UL subframes in the TTI bundle. Another method may include ignoring reception of downlink subframes for a duration of the TTI bundle.
1. A method for wireless communications by a user equipment (UE), comprising:
identifying a transmit time interval (TTI) bundle comprising a plurality of uplink (UL) subframes for transmitting to a node;
identifying a segment of UL subframes in the TTI bundle; and
maintaining a same transmit power in all uplink subframes of the segment when transmitting to the node over the segment of UL subframes in the TTI bundle.
2. The method of claim 1 , wherein the segment of UL subframes corresponds to an assumed coherent estimation interval.
3. The method of claim 1 , wherein the segment of UL subframes corresponds to the plurality of UL subframes in the TTI bundle.
4. The method of claim 1 , wherein a size of the segment is semi-statically configured.
5. The method of claim 1 , further comprising maintaining at least one of timing or frequency over the segment of UL subframes in the TTI bundle.
6. The method of claim 5 , wherein maintaining the at least one of timing or frequency over the segment of UL subframes in the TTI bundle comprises updating UL transmission and frequency on a per segment basis of the same TTI bundle.
7. The method of claim 6 , wherein an update on UL timing and frequency across segments is triggered by a timing advance (TA) command issued by the node.
8. The method of claim 7 , wherein the TA command signals a start of a new segment.
9. The method of claim 7 , wherein:
segment size is semi-statically configured; and
the UE updates the UL timing and frequency in a next segment after receiving the TA command.
10. The method of claim 1 , further comprising disabling time and frequency tracking for both downlink (DL) and UL within each segment.
11. The method of claim 1 , further comprising determining whether to maintain the same transmit power over the segment based at least in part on a signal received from the node.
12. The method of claim 11 , wherein the signal received from the node comprises a one bit signal to enable maintaining the same transmit power over the segment.
13. The method of claim 11 , wherein the signal is cell-specific.
14. The method of claim 11 , wherein the signal is semi-static.
15. The method of claim 1 , further comprising determining whether to maintain the same transmit power over the segment based at least in part on a size of the TTI bundle.
16. The method of claim 15 , further comprising determining to maintain the same transmit power if the size of the TTI bundle is larger than a threshold.
17. The method of claim 15 , further comprising:
determining whether to maintain the same transmit power based at least in part on a time division duplex (TDD) downlink/uplink subframe configuration.
18. An apparatus for wireless communications by a user equipment (UE), comprising:
at least one processor configured to:
identify a transmit time interval (TTI) bundle comprising a plurality of uplink (UL) subframes for transmitting to a node;
identify a segment of UL subframes in the TTI bundle; and
maintain a same transmit power in all uplink subframes of the segment when transmitting to the node over the-segment of UL subframes in the TTI bundle; and
a memory coupled to the at least one processor.
19. An apparatus for wireless communications by a user equipment (UE), comprising:
means for identifying a transmit time interval (TTI) bundle comprising a plurality of uplink (UL) subframes for transmitting to a node;
means for identifying a segment of UL subframes in the TTI bundle; and
means for maintaining a same transmit power in all uplink subframes of the segment when transmitting to the node over the segment of UL subframes in the TTI bundle.
20. A non-transitory computer-readable medium for wireless communications by a user equipment (UE), comprising code, which when executed by at least one processor, causes the UE to:
identify a transmit time interval (TTI) bundle comprising a plurality of uplink (UL) subframes for transmitting to a node;
identify a segment of UL subframes in the TTI bundle; and
maintaining a same transmit power in all uplink subframes of the segment when transmitting to the node over the segment of UL subframes in the TTI bundle.