Signaling and scheduling to enable network configured small gaps in intra-band inter-frequency measurement
Certain aspects of the present disclosure provide techniques for signaling and scheduling to enable network configured small gaps in intra-band inter-frequency measurement. A method that may be performed by a user equipment (UE) includes receiving, from a serving cell operating on a first frequency, an indication that synchronization signal block (SSB) indexes of a target cell operating on a second frequency can be derived from timing of the serving cell; and deriving an SSB index of the target cell, based on the timing of the serving cell.
1. An apparatus for wireless communications at a user equipment (UE), comprising:
a processor;
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
receive, from a serving cell operating on a first frequency, an indication that synchronization signal block (SSB) indexes of a target cell operating on a second frequency can be derived from timing of the serving cell; and
derive an SSB index of the target cell, based on the timing of the serving cell.
2. The apparatus of claim 1 , wherein the instructions further comprise instructions to cause the apparatus to:
receive an indication of an index of another serving cell within a cell group including the serving cell, wherein the instructions to derive the SSB index of the target cell further comprise instructions to derive the SSB index of the target cell based on a timing of the other serving cell.
3. The apparatus of claim 1 , wherein the instructions to receive the indication comprise instructions to receive the indication in a broadcast transmission.
4. The apparatus of claim 1 , wherein the instructions to receive the indication comprise instructions to receive the indication in a UE-specific transmission.
5. The apparatus of claim 4 , wherein the instructions to receive the indication comprise instructions to receive the indication in an RRCRelease message to the UE.
6. The apparatus of claim 4 , wherein the instructions to receive the indication comprise instructions to receive the indication in a measurement object (MO) configuration.
7. The apparatus of claim 1 , wherein the instructions to derive the SSB index of the target cell comprise instructions to:
assume a system frame number (SFN) for the target cell equal to an SFN for the serving cell;
determine a frame boundary for the target cell aligned with a frame boundary for the serving cell; and
determine the SSB index of the target cell based on the SFN for the target cell, the frame boundary for the target cell, and the SSB index of the serving cell.
8. The apparatus of claim 1 , wherein the first frequency and the second frequency are different but in a same frequency band.
9. The apparatus of claim 1 , wherein:
the first frequency is in a first frequency band;
the second frequency is in a second frequency band; and
the serving cell and the target cell operate using common beam management (CBM).
10. The apparatus of claim 1 , wherein the indication comprises an indication for the UE to use network configured small gaps (NCSGs).
11. An apparatus for wireless communications at a serving cell operating on a first frequency, comprising:
a processor;
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
transmit, to a user equipment (UE), an indication that synchronization signal block (SSB) indexes of a target cell operating on a second frequency can be derived from timing of the serving cell; and
refrain from scheduling the UE to transmit or receive a communication during a period comprising: consecutive SSB symbols to be measured from the target cell within an SSB measurement time configuration (SMTC) window duration, 1 data symbol before the consecutive SSB symbols to be measured, and 1 data symbol after the consecutive SSB symbols to be measured.
12. The apparatus of claim 11 , wherein the instructions further comprise instructions to cause the apparatus to:
transmit an indication of an index of another serving cell within a cell group including the serving cell, wherein the index of the other serving cell indicates to the UE that SSB indexes of the target cell can be derived from timing of the other serving cell.
13. The apparatus of claim 11 , wherein the instructions to transmit the indication comprise instructions to transmit the indication in a broadcast transmission.
14. The apparatus of claim 11 , wherein the instructions to transmit the indication comprise instructions to transmit the indication in a UE-specific transmission.
15. The apparatus of claim 14 , wherein the instructions to transmit the indication comprise instructions to transmit the indication in an RRCRelease message to the UE.
16. The apparatus of claim 14 , wherein the instructions to transmit the indication comprise instructions to transmit the indication in a measurement object (MO) configuration.
17. The apparatus of claim 11 , wherein the first frequency and the second frequency are in a same frequency band.
18. The apparatus of claim 11 , wherein:
the first frequency is in a first frequency band;
the second frequency is in a second frequency band; and
the serving cell and the target cell operate using common beam management (CBM).
19. The apparatus of claim 11 , wherein the indication comprises an indication for the UE to use network configured small gaps (NCSGs).
20. An apparatus for wireless communication at a user equipment (UE), comprising:
means for receiving, from a serving cell operating on a first frequency, an indication that synchronization signal block (SSB) indexes of a target cell operating on a second frequency can be derived from timing of the serving cell; and
means for deriving an SSB index of the target cell, based on the timing of the serving cell.
21. The apparatus of claim 20 , further comprising:
means for receiving an indication of an index of another serving cell within a cell group including the serving cell, wherein the means for deriving the SSB index of the target cell further comprise means for deriving the SSB index of the target cell based on a timing of the other serving cell.
22. The apparatus of claim 20 , wherein the means for receiving the indication comprise means for receiving the indication in a broadcast transmission.
23. The apparatus of claim 20 , wherein the means for receiving the indication comprise means for receiving the indication in a UE-specific transmission.
24. The apparatus of claim 23 , wherein the means for receiving the indication comprise means for receiving the indication in an RRCRelease message to the UE.
25. The apparatus of claim 23 , wherein the means for receiving the indication comprise means for receiving the indication in a measurement object (MO) configuration.
26. The apparatus of claim 20 , wherein the means for deriving the SSB index of the target cell comprise:
means for assuming a system frame number (SFN) for the target cell equal to an SFN for the serving cell;
means for determining a frame boundary for the target cell aligned with a frame boundary for the serving cell; and
means for determining the SSB index of the target cell based on the SFN for the target cell, the frame boundary for the target cell, and the SSB index of the serving cell.
27. The apparatus of claim 20 , wherein the first frequency and the second frequency are different but in a same frequency band.
28. The apparatus of claim 20 , wherein:
the first frequency is in a first frequency band;
the second frequency is in a second frequency band; and
the serving cell and the target cell operate using common beam management (CBM).
29. The apparatus of claim 20 , wherein the indication comprises an indication for the UE to use network configured small gaps (NCSGs).
30. An apparatus for wireless communication at a serving cell operating on a first frequency, comprising:
means for transmitting, to a user equipment (UE), an indication that synchronization signal block (SSB) indexes of a target cell operating on a second frequency can be derived from timing of the serving cell; and
means for refraining from scheduling the UE to transmit or receive a communication during a period comprising: consecutive SSB symbols to be measured from the target cell within an SSB measurement time configuration (SMTC) window duration, on 1 data symbol before the consecutive SSB symbols to be measured, and on 1 data symbol after the consecutive SSB symbols to be measured.