Modification of SSB burst pattern
Certain aspects of the present disclosure provide techniques for efficiently selecting beams for synchronization signal block (SSB) burst transmissions based on a condition. Techniques include selecting certain directions to transmit higher power beams and selecting certain directions to transmit lower power SSB burst transmissions. In some cases, an SSB burst parameter may be modified to use a reduced number of optimal SSB beams. The modified SSB burst parameter may have a reduced SSB burst duration, which may allow for reduced monitoring time by a UE and/or free up resources (that would otherwise be used for SSB transmissions) for data transmissions. Additional aspects relate generally to the beam management procedures in wireless communications systems. Some aspects more specifically relate to the selection of beams for communications to and from a UE and a network entity based on predicted mobility state information for a user equipment (UE).
1. A method for wireless communication by a network entity, comprising:
detecting at least one condition involving at least one of a time of day or position information of one or more user equipments (UEs);
modifying at least one synchronization signal block (SSB) burst parameter based on the detected condition; and
transmitting SSBs in a modified SSB burst set according to the modified SSB burst parameter.
2. The method of claim 1 , wherein the modified SSB burst parameter is determined using a machine learning (ML) algorithm.
3. The method of claim 1 , wherein the at least one condition further involves a transition of one or more UEs to or from an initial acquisition mode, idle mode, or connected mode.
4. The method of claim 1 , wherein modifying the SSB burst parameter comprises modifying an SSB burst pattern.
5. The method of claim 4 , wherein modifying the SSB burst pattern comprises reducing a number of SSB beams swept based on the at least one condition.
6. The method of claim 5 , further comprising determining the reduced number of SSB beams based on historical data, comprising:
determining usage statistics of SSB beams of the SSB burst pattern, before modification; and
identifying SSB beams that are more heavily used than other SSB beams.
7. The method of claim 4 , wherein modifying the SSB burst pattern comprises modifying at least one of an SSB duration, an SSB periodicity, or number of SSB beams swept.
8. The method of claim 1 , further comprising providing information regarding at least the modified SSB burst parameter via broadcast system information.
9. The method of claim 8 , wherein:
the modified SSB burst set has a reduced number of SSB beams swept relative to an SSB burst set before modification; and
the broadcast system information indicates a time and duration for the modified SSB burst set.
10. The method of claim 1 , wherein:
the SSB burst parameter comprises a transmit power distribution across a set of SSB beams of an SSB burst pattern; and
transmitting SSBs according to the modified SSB burst parameter comprises transmitting a first subset of the set of SSB beams using a higher transmit power relative to a second subset of the set of SSB beams.
11. The method of claim 10 , further comprising determining the first subset of SSB beams based on the at least one condition.
12. The method of claim 11 , wherein determining the first subset of SSB beams is based on historical data and comprises:
determining usage statistics of set of SSB beams of the SSB burst pattern;
selecting, as the first subset of SSB beams, SSB beams that are more frequently used than other SSB beams; and
selecting, as the second subset of SSB beams, SSB beams that are less frequently used than the first subset of SSB beams.
13. The method of claim 10 , wherein:
the network entity transmits SSBs with the first subset of SSB beams with higher transmit power than SSBs with the second subset of SSB beams when transmitting the SSB burst pattern at certain times; and
the network entity transmits SSBs with the first subset of SSB beams and second subset of SSB beams with a same transmit power at other times.
14. The method of claim 10 , wherein:
the network entity transmits SSBs with the first subset of SSB beams with higher transmit power than SSBs with the second subset of SSB beams when the one or more UEs are in a connected mode; and
the network entity transmits SSBs with the first subset of SSB beams and second subset of SSB beams with a same transmit power when one or more UEs are in an idle or initial acquisition mode.
15. The method of claim 10 , further comprising providing information regarding the first subset of SSB beams and a difference in transmit power used for the first subset of SSB beams and the second subset of SSB beams.
16. The method of claim 15 , wherein the information is provided via broadcast system information.
17. The method of claim 15 , wherein the information indicates at least one of:
the first subset of SSB beams by one or more beam indexes or one or more beam index sets;
a difference in the transmit power used to transmit SSBs with the first subset of SSB beams and the transmit power used to transmit SSBs with the second subset of SSB beams; or
a scaling factor used to derive the transmit power used to transmit SSBs with the second subset of SSB beams from the transmit power used to transmit SSBs with the first subset of SSB beams.
18. A processing system for wireless communication by a user equipment (UE), comprising:
one or more processors individually or collectively configured to execute instructions stored on one or more processors and to cause the UE to:
detect at least one condition comprising at least one of a time of day or position information of the UE; and
determine a modified synchronization signal block (SSB) burst parameter based on the detected at least one condition; and
monitor SSBs in a modified SSB burst set according to the modified SSB burst parameter.
19. The processing system of claim 18 , wherein:
the one or more processors are further configured to cause the UE to monitor SSBs according to the modified SSB burst parameter; and
the modified SSB burst parameter indicates a modified SSB burst pattern comprising a reduced number of SSB beams swept based on the at least one condition.
20. The processing system of claim 19 , wherein the one or more processors are further configured to cause the UE to receive modified SSB measurements based on the modified SSB burst pattern.
21. The processing system of claim 20 , wherein the modified SSB burst pattern has at least one of an SSB duration, an SSB periodicity, or number of SSB beams swept modified relative to an SSB burst pattern before modification.
22. The processing system of claim 18 , wherein the at least one condition involves a transition of one or more UEs to or from an initial acquisition mode, idle mode, or connected mode.
23. The processing system of claim 18 , wherein the one or more processors are further configured to cause the UE to obtain information regarding at least the modified SSB burst parameter via broadcast system information.
24. The processing system of claim 23 , wherein:
the information indicates the modified SSB burst set has a reduced number of SSB beams swept relative to an SSB burst set before modification; and
the information indicates a time and duration for the modified SSB burst set.
25. The processing system of claim 23 , wherein the one or more processors are further configured to cause the UE to:
use the information regarding at least the modified SSB burst parameter when making mobility related decisions; and
adjust at least one of SSB measurements or SSB measurement reporting based on the information.
26. The processing system of claim 18 , wherein the one or more processors are further configured to cause the UE to obtain information regarding a first subset of SSB beams transmitted with higher transmit power than SSB beams transmitted with a second subset of the SSB beams and to monitor SSBs according to an SSB burst pattern.
27. The processing system of claim 26 , wherein the information indicates that:
at certain times, SSBs transmitted with the first subset of SSB beams are transmitted using a transmit power that is higher than a transmit power used to transmit SSBs with the second subset of SSB beams; and
at other times, SSBs transmitted with the first subset of SSB beams and second subset of SSB beams are transmitted with a same transmit power.
28. The processing system of claim 27 , wherein:
the information indicates at least one of:
a difference in the transmit power used to transmit the SSBs with the first subset of SSB beams and the transmit power used to transmit the SSBs with the second subset of SSB beams;
a scaling factor used to derive the transmit power used to transmit the SSBs with the second subset of SSB beams from the transmit power used to transmit the SSBs with the first subset of SSB beams; or
a time and duration for when a network entity transmits the SSBs with the first subset of SSB beams with higher transmit power than the SSBs with the second subset of SSB beams; and
the one or more processors are further configured to cause the UE to adjust reference signal receive power (RSRP) measurements for the second subset of SSB beams based on the difference in transmit power or the scaling factor.
29. A method for wireless communication by a user equipment (UE), comprising:
detecting at least one condition comprising at least one of a time of day or position information of the UE;
determining a modified synchronization signal block (SSB) burst parameter based on the detected at least one condition; and
monitoring SSBs in a modified SSB burst set according to the modified SSB burst parameter.
30. A processing system for wireless communication by a network entity, comprising:
one or more processors individually or collectively configured to execute instructions stored on one or more memories and to cause the network entity to:
detect at least one condition involving at least one of a time of day or position information of one or more user equipments (UEs);
modify at least one synchronization signal block (SSB) burst parameter based on the detected condition; and
transmit SSBs in a modified SSB burst set according to the modified SSB burst parameter.