On demand system information block 1 configurations
Certain aspects of the present disclosure provide techniques for on demand system information block 1 (OD-SIB1) transmission in non-anchor cells. A method includes receiving, in a first anchor cell of a first network entity, a first configuration for an OD-SIB1 procedure in a non-anchor cell, wherein the first configuration is common to a first plurality of non-anchor cells supporting OD-SIB1 transmission; sending, in a first non-anchor cell of the first plurality of non-anchor cells, a request to send an OD-SIB1 based at least in part on the first configuration; and receiving, in the first non-anchor cell, the OD-SIB1 based at least in part on the first configuration.
1 . An apparatus configured for wireless communications, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors being configured to cause the apparatus to:
receive, in a first anchor cell of a first network entity, a first configuration for an on demand system information block 1 (OD-SIB1) procedure in a non-anchor cell, wherein the first configuration is common to a first plurality of non-anchor cells supporting OD-SIB1 transmission;
send, in a first non-anchor cell of the first plurality of non-anchor cells, a request to send an OD-SIB1 based at least in part on the first configuration; and
receive, in the first non-anchor cell, the OD-SIB1 based at least in part on the first configuration.
2 . The apparatus of claim 1 , wherein a plurality of non-anchor cells, including the first non-anchor cell, correspond to a same frequency.
3 . The apparatus of claim 1 , wherein:
a first coverage area associated with each of the first plurality of non-anchor cells overlaps a second coverage area associated with the first anchor cell, and
the second coverage area covers a geographic location of the apparatus.
4 . The apparatus of claim 3 , wherein:
the one or more processors are configured to cause the apparatus to receive, in a second anchor cell, a second configuration for the OD-SIB1 procedure in the non-anchor cell based at least in part on a relocation of the apparatus from within the second coverage area to within a third coverage area associated with the second anchor cell,
the second configuration is common to a second plurality of non-anchor cells supporting OD-SIB1 transmission, and
a fourth coverage area associated with each of the second plurality of non-anchor cells overlaps the third coverage area associated with the second anchor cell.
5 . The apparatus of claim 1 , wherein first coverage areas associated with the first plurality of non-anchor cells overlap second coverage areas associated with a first plurality of anchor cells, including the first anchor cell.
6 . The apparatus of claim 5 , wherein each of the first plurality of anchor cells is associated with a same first cell group, comprising:
an OD-SIB1 anchor cell group;
a paging cell group; or
a cell group associated with a first tracking area.
7 . The apparatus of claim 6 , wherein the one or more processors are configured to cause the apparatus to:
receive, in a second anchor cell associated with a second cell group, a second configuration for the OD-SIB1 procedure in the non-anchor cell based at least in part on a relocation of the apparatus from within one of the second coverage areas to within a third coverage area associated with the second anchor cell.
8 . The apparatus of claim 1 , wherein the first configuration comprises at least one of:
a second configuration associated with synchronization signal blocks (SSBs) reception in the first plurality of non-anchor cells;
a third configuration for sending one or more OD-SIB1 requests, including the request to send the OD-SIB1;
a fourth configuration for receiving one or more OD-SIB1s, including the OD-SIB1; or
a fifth configuration for sending hybrid automatic repeat request (HARQ) acknowledgement (ACK) or negative ACK (NACK) feedback in response to the one or more OD-SIB1s.
9 . The apparatus of claim 1 , wherein:
the OD-SIB1 comprises a unicast transmission, and
the first configuration comprises:
an indication of a downlink bandwidth part (BWP) to use for performing an OD-SIB1 reception; and
one or more occasions configured for receiving downlink control information (DCI) scheduling one or more OD-SIB1s during the OD-SIB1 reception, including the OD-SIB1.
10 . The apparatus of claim 1 , wherein the first configuration comprises one or more parameters associated with SSBs received in the first plurality of non-anchor cells.
11 . The apparatus of claim 1 , wherein:
the OD-SIB1 comprises a unicast transmission or a broadcast transmission, and
the one or more processors are configured to cause the apparatus to receive, in the first non-anchor cell, an SSB comprising an indication of at least one of:
a downlink BWP to use for performing an OD-SIB1 reception; or
one or more occasions configured for receiving downlink control information (DCI) scheduling one or more OD-SIB1s during the OD-SIB1 reception, including the OD-SIB1.
12 . The apparatus of claim 1 , wherein the first configuration comprises:
an indication of an uplink bandwidth part (BWP) to use for performing a RACH procedure for sending OD-SIB1 requests;
a plurality of RACH occasions (ROs) configured for sending the OD-SIB1 requests during the RACH procedure, including the request to send the OD-SIB1; and
one or more parameters for the RACH procedure.
13 . The apparatus of claim 12 , wherein the first configuration further comprises:
a plurality of SSB occasions configured for receiving a set of SSBs in one or more SSB bursts in the first plurality of non-anchor cells; and
a mapping between the plurality of SSB occasions and the plurality of ROs.
14 . The apparatus of claim 12 , wherein to send, in the first non-anchor cell, the request to send the OD-SIB1, the one or more processors are configured to cause the apparatus to send the request via a random access preamble used to initiate the RACH procedure.
15 . The apparatus of claim 14 , wherein:
the one or more parameters for the RACH procedure comprise a configured physical RACH (PRACH) root sequence index, and
a root sequence index of the random access preamble is based at least in part on the configured PRACH root sequence index parameter and a cell identifier of the first non-anchor cell; or
the one or more parameters for the RACH procedure comprise a configured random access preamble index parameter, and
a preamble index of the random access preamble is based at least in part on the configured random access preamble index parameter and a cell identifier of the first non-anchor cell; or
the one or more parameters for the RACH procedure comprise one or more configured frequency domain resource allocation (FDRA) parameters, and
a starting frequency of a resource used for sending the random access preamble is based at least in part on the one or more configured FDRA parameters and a cell identifier of the first non-anchor cell.
16 . The apparatus of claim 1 , wherein:
the one or more processors are configured to cause the apparatus to:
receive, in the first non-anchor cell, an SSB comprising a master information block (MIB) with a cell barred field set to barred; and
ignore the cell barred field set to barred, and
the one or more processors are configured to cause the apparatus to send the request to send the OD-SIB1 based at least in part on ignoring the cell barred field.
17 . The apparatus of claim 1 , wherein:
the OD-SIB1 comprises a cell barred field set to not barred, and
the one or more processors are configured to cause the apparatus to establish a radio resource control (RRC) connection with the first network entity in the first non-anchor cell.
18 . The apparatus of claim 1 , wherein:
the OD-SIB1 comprises a cell barred field set to barred, and
the one or more processors are configured to cause the apparatus to:
receive an indication to establish an RRC connection with the first network entity; and
refrain from establishing the RRC connection with the first network entity in the first non-anchor cell based at least in part on the OD-SIB1 comprising the cell barred field set to barred.
19 . An apparatus configured for wireless communications, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors being configured to cause the apparatus to:
send, in a first anchor cell of the apparatus, a first configuration for an on demand system information block 1 (OD-SIB1) procedure in a non-anchor cell, wherein the first configuration is common to a first plurality of non-anchor cells supporting OD-SIB1 transmission;
receive, in a first non-anchor cell of the first plurality of non-anchor cells and associated with the apparatus, a request to send an OD-SIB1 based at least in part on the first configuration; and
send, in the first non-anchor cell, the OD-SIB1 based at least in part on the first configuration.
20 . A method for wireless communications by an apparatus comprising:
receiving, in a first anchor cell of a first network entity, a first configuration for an on demand system information block 1 (OD-SIB1) procedure in a non-anchor cell, wherein the first configuration is common to a first plurality of non-anchor cells supporting OD-SIB1 transmission;
sending, in a first non-anchor cell of the first plurality of non-anchor cells, a request to send an OD-SIB1 based at least in part on the first configuration; and
receiving, in the first non-anchor cell, the OD-SIB1 based at least in part on the first configuration.