Polarization indications for synchronization signal block, coreset, and beam footprint
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of a polarization of at least one synchronization signal block (SSB). The UE may determine a polarization of another beam based at least in part on the indicated polarization. Numerous other aspects are provided.
1 . An apparatus for wireless communication at a user equipment (UE), comprising:
one or more memories; and
one or more processors coupled to the one or more memories, which are configured, individually or in any combination, to:
receive, on a physical broadcast channel, a master information block comprising an indication of a polarization of at least one synchronization signal block (SSB), wherein the polarization is a circular or linear polarization, and wherein the indication of the polarization is encoded with a scrambling sequence for bits of the physical broadcast channel;
receive the at least one SSB in a first beam with the indicated polarization; and
communicate using an antenna configuration that is based at least in part on the at least one SSB and the indicated polarization, wherein, in communicating using the antenna configuration, the one or more processors are configured to measure a quality of a communication for each of a plurality of receive antenna polarizations and associate a receive antenna polarization with the indicated polarization based at least in part on quality measurements for the plurality of receive antenna polarizations.
2 . The apparatus of claim 1 , wherein the indication associates a polarization with each beam of one or more beams, and wherein each beam is identified by one or more of an SSB index or a physical cell identity.
3 . The apparatus of claim 1 , wherein the master information block indicates a polarization of a control resource set zero.
4 . The apparatus of claim 1 , wherein the indication is a demodulation reference signal sequence for the physical broadcast channel.
5 . The apparatus of claim 1 , wherein the indication indicates a polarization from among polarizations that are orthogonal to one another.
6 . The apparatus of claim 1 , wherein the one or more processors are configured to:
determine an interpretation of the indicated polarization based at least in part on a receive antenna polarization.
7 . The apparatus of claim 1 , wherein the at least one SSB indicates a polarization for each of one or more control resource sets zero.
8 . The apparatus of claim 1 , wherein the one or more processors are configured to determine a polarization of a control resource set zero to be a same polarization as the at least one SSB.
9 . The apparatus of claim 1 , wherein the one or more processors are configured to receive an indication of a polarization of an initial downlink bandwidth part and a polarization of an initial uplink bandwidth part in a system information block 1 (SIB1).
10 . The apparatus of claim 1 , wherein the one or more processors are configured to:
receive an indication of a polarization of a control resource set zero (CORESET #0); and
determine an indication of a polarization of a downlink bandwidth part and a polarization of an uplink bandwidth part based at least in part on one or more of the polarization of the CORESET #0 or the polarization of the at least one SSB.
11 . The apparatus of claim 1 , wherein the one or more processors are configured to:
receive, in system information, an indication of an SSB pattern of one or more of a time resource, a frequency resource, or a polarization; and
monitor for SSBs, SSB pairs, or SSB bursts based at least in part on the SSB pattern.
12 . The apparatus of claim 11 , wherein each SSB pair of the SSB pairs includes an SSB with a first polarization and an SSB with a second polarization.
13 . The apparatus of claim 11 , wherein the SSBs, SSB pairs, or SSB bursts have a specified polarization.
14 . The apparatus of claim 11 , wherein the SSB bursts have alternating polarizations.
15 . An apparatus for wireless communication at a non-terrestrial network entity, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, which are configured, individually or in any combination, to:
select a scrambling sequence for bits of a physical broadcast channel (PBCH);
encode an indication of a polarization of at least one synchronization signal block (SSB) with the scrambling sequence, wherein the polarization is a circular or linear polarization;
transmit, on the PBCH, the indication of the polarization; and
transmit the at least one SSB, for which the polarization is indicated, with the indicated polarization in a beam, wherein the indicated polarization is selected based at least in part on quality measurements of a communication using a plurality of receive antenna polarizations.
16 . The apparatus of claim 15 , wherein the SSB indicates a polarization for each of one or more control resource sets zero.
17 . The apparatus of claim 15 , wherein the one or more processors are configured to transmit an indication of a polarization of a control resource set zero in a medium access control element (MAC CE) or a radio resource control message.
18 . The apparatus of claim 15 , wherein the one or more processors are configured to transmit, in a system information block 1 (SIB1), an indication of a polarization of an initial downlink bandwidth part and a polarization of an initial uplink bandwidth part.
19 . An apparatus for wireless communication at a user equipment (UE), comprising:
one or more memories; and
one or more processors coupled to the one or more memories, which are configured, individually or in any combination, to:
receive an indication of a polarization of a bandwidth part in a system information block, wherein the polarization of the bandwidth part is relative to a polarization of a reference signal;
receive an indication of a polarization of a control resource set zero (CORESET #0) in one of a medium access control element (MAC CE) or a radio resource control message, wherein the polarization of the CORESET #0 is relative to the polarization of the reference signal; and
configure one or more antennas for receiving the CORESET #0 based at least in part on the polarization of the CORESET #0, wherein a configuration of the one or more antennas is selected based at least in part on quality measurements of communications using a plurality of receive antenna polarizations and is associated with the indicated polarization.
20 . The apparatus of claim 19 , wherein the indication of the polarization of the CORESET #0 specifies the polarization of the CORESET #0.
21 . The apparatus of claim 19 , wherein the indication of the polarization of the CORESET #0 includes one or more transmission configuration indicator (TCI) states that indicate a quasi-colocation (QCL) type, and wherein the one or more processors are configured to determine the polarization of the CORESET #0 based at least in part on the one or more TCI states.
22 . The apparatus of claim 19 , wherein configuring the one or more antennas comprises selecting, based at least in part on quality measurements of communications using a plurality of receive antenna polarizations, a receive antenna polarization to be used for receiving the CORESET #0.
23 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving, on a physical broadcast channel, a master information block comprising an indication of a polarization of at least one synchronization signal block (SSB), wherein the polarization is a circular or linear polarization, and wherein the indication of the polarization is encoded with a scrambling sequence for bits of the physical broadcast channel;
receiving the at least one SSB in a first beam with the indicated polarization; and
communicating using an antenna configuration that is based at least in part on the at least one SSB and the indicated polarization, wherein the antenna configuration is selected based at least in part on quality measurements of a communication using a plurality of receive antenna polarizations and is associated with the indicated polarization.
24 . The method of claim 23 , wherein the indication associates a polarization with each beam of one or more beams, and wherein each beam is identified by one or more of an SSB index or a physical cell identity.
25 . The method of claim 23 , wherein the master information block indicates a polarization of a control resource set zero.
26 . The method of claim 23 , wherein the indication is a demodulation reference signal sequence for the physical broadcast channel.
27 . The method of claim 23 , wherein the indication indicates a polarization from among polarizations that are orthogonal to one another.
28 . The method of claim 23 , wherein the at least one SSB indicates a polarization for each of one or more control resource sets zero.
29 . The method of claim 23 , wherein the antenna configuration is selected based at least in part on the at least one SSB and the quality measurements.
30 . The method of claim 23 , wherein the antenna configuration is based at least in part on at least one receive antenna polarization.