Cell selection and re-selection procedures for reduced capability user equipment
Certain aspects of the present disclosure provide techniques for wireless communication by a user equipment (UE), generally including receiving, from a network entity, a configuration for a first downlink (DL) bandwidth part (BWP), a first control resource set (CORESET) configured on the first DL BWP, and one or more first search space (SS) sets within the first CORESET, receiving, from the network entity, a configuration for a second downlink BWP, a second CORESET configured on the second DL BWP, and one or more second SS sets within the second CORESET configured on a second DL BWP, and performing one or more idle mode or inactive mode procedures on the first DL BWP or the second DL BWP, based on signaling received while the UE is in an idle state or an inactive state.
1. An apparatus for wireless communication at a user equipment (UE), comprising:
memory comprising computer-executable instructions; and
one or more processors configured to, individually or collectively, execute the computer-executable instructions and cause the apparatus to:
receive, from a network entity via a master information block, a configuration for a first downlink (DL) bandwidth part (BWP), a first control resource set (CORESET) configured on the first DL BWP, and one or more first search space (SS) sets within the first CORESET, wherein the UE comprises a UE of a first type having a first set of capabilities, and wherein the first CORESET and the first SS sets are configured for use by UEs of the first type and UEs of a second type having a second set of capabilities;
receive, from the network entity via system information on the first DL BWP, a configuration for a second DL BWP, a second CORESET configured on the second DL BWP, and one or more second SS sets within the second CORESET configured on a second DL BWP, wherein the configuration for the second DL BWP indicates at least one of:
a location, numerology and bandwidth of the second DL BWP;
that the second CORESET and second SS sets are configured for at least one of idle mode or inactive mode procedures in the second DL BWP;
a discontinuous reception (DRX) configuration;
a criteria for measurements relaxation; or
configuration information for one or more DL reference signals transmitted in the second DL BWP; and
perform one or more of a cell selection or cell re-selection procedure, based on signaling received on the second DL BWP, while the UE is in an idle state or an inactive state, wherein the second DL BWP is configured for dedicated use by UEs of the first type.
2. The apparatus of claim 1 , wherein the second CORESET and second SS sets are configured for reception of multicast and broadcast messages.
3. The apparatus of claim 1 , wherein:
the configuration information for the one or more DL reference signals transmitted in the second DL BWP comprise at least one of: cell defining (CD) synchronization signal blocks (CD-SSBs), non-cell defining SSBs (NCD-SSBs), channel state information (CSI) RS, phase tracking RS (PTRS), positioning RS (PRS), or other DL RSs.
4. The apparatus of claim 3 , wherein the at least one of idle mode or inactive mode procedures in the second DL BWP comprise at least one cell selection or cell re-selection procedures based on one or a combination of:
the CD-SSBs, the NCD-SSBs, the other DL RSs, or a combination thereof.
5. The apparatus of claim 1 , wherein the one or more processors are further configured to, individually or collectively, execute the computer-executable instructions and cause the apparatus to:
determine a resource mapping for a common CORESET associated with system information acquisition of cell selection or re-selection, wherein the resource mapping for the common CORESET is determined based on an index of a look up table (LUT) associated with a numerology of the CD-SSBs and a numerology of the common CORESET and the index of the LUT is determined based on a demodulation reference signal (DMRS) scrambling ID, a payload of a physical broadcast channel (PBCH) in the CD-SSB, or a combination thereof.
6. The apparatus of claim 5 , wherein:
the other DL RSs are quasi co-located (QCL'ed) with at least one of the CD-SSBs or the NCD-SSBs; and
the other DL RSs are suitable for spatial relation configuration of uplink (UL) resources in an UL BWP linked to the second DL BWP.
7. The apparatus of claim 5 , wherein the cell selection or cell re-selection procedures are based on at least one of reference signal received power (RSRP) or reference signal received quality (RSRQ) measurements based on at least one of the CD-SSBs, the NCD-SSBs, or the other DL RSs.
8. The apparatus of claim 7 , wherein:
the RSRP or RSRQ measurements are based on at least one of: broadcast or multicast DL RSs that are quasi co-located (QCL'ed) with the CD-SSBs, the NCD-SSBs, or the DMRS associated with physical downlink control channel (PDCCH) or physical downlink shared data channel (PDSCH) that are broadcast or multicast to idle or inactive UEs in the first DL BWP or the second DL BWP; and
the RSRP or RSRQ measurements are to be performed in at least one the first DL BWP or the second DL BWP.
9. The apparatus of claim 7 , wherein the RSRP or RSRQ measurements are based on SSBs or other DL RSs that are quasi co-located (QCL'ed) with a paging physical downlink control channel (PDCCH), a paging early indication (PEI) channel, a PDCCH scheduling random access response (RAR) of a random access procedure, a PDCCH scheduling transmission or retransmission of MBS messages, or a PDCCH scheduling transmission or retransmission of small data.
10. The apparatus of claim 7 , wherein the RSRP or RSRQ measurements are based on SSBs or other DL RSs used for random access channel (RACH) occasion (RO) selection, msgA PUSCH occasion selection, validation of timing advance timer, validation and selection of small data transmission occasion, validation and selection of PUCCH and sounding reference signal (SRS) resource sets.
11. The apparatus of claim 10 , wherein:
the SSBs used for RO selection are (QCL'ed) with a paging physical downlink control channel (PDCCH), a paging early indication (PEI) channel, a wake-up signal (WUS), a PDCCH or PDSCH channel associated with MBS, or a combination thereof, and
the PDCCH or PDSCH channels QCL'ed with SSBs are transmitted in the first DL BWP, the second DL BWP, or a combination thereof.
12. The apparatus of claim 7 , wherein the RSRP or RSPQ measurements are based on selecting one RS type from cell-defining SSBs (CD-SSB), non-cell-defining SSBs (NCD-SSB), or the DL RSs broadcast or multicast to UE.
13. The apparatus of claim 7 , wherein:
the RSRP or RSRQ measurements are at least one of: taken in more than one DL BWPs or based on more than one RS type; and
the one or more processors are further configured to, individually or collectively, execute the computer-executable instructions and cause the apparatus to receive, via system information (SI), processing parameters comprising at least one of:
cell-specific filtering, weighting, or combining parameters,
offsets applicable to RSRP or RSRQ measurements by UEs of the first type,
compensation factors applicable to UEs of the first type, or
thresholds, wherein the processing parameters depend on whether measurements are RSRP or RSRQ measurements, the DL RS type, criteria of radio resource management (RRM) relaxation, positioning or ranging information available to UE, an RRC state of the UE, UE capability, or a combination thereof.
14. The apparatus of claim 1 , wherein:
the configuration information for the one or more DL reference signals transmitted in the second DL BWP includes transmission parameters and availability indication;
the transmission parameters are obtainable in one or more of the first DL BWP or the second DL BWP; and
the availability indication is provided to UEs of the first type separately via at least one of: system information, radio resource control (RRC) message, medium access control (MAC) control element (CE), or DL control information (DCI).
15. The apparatus of claim 1 , wherein the at least one of idle mode or inactive mode procedures on the second BWP comprise one or more of:
measurements for cell selection or cell re-selection;
a random access channel (RACH) procedure;
paging;
requesting for on-demand system information (SI);
mobile originated (MO) small data transmission (MO SDT) based on the RACH procedure or a configured grant (CG);
mobile terminated (MT) small data transmission (MT SDT) triggered by paging, random access response (RAR), contention resolution, MO-SDT or a combination thereof;
reception of multicast or broadcast messages; or
reception of SI and RS for positioning.
16. The apparatus of claim 15 , wherein synchronization signal blocks (SSBs) or other DL RS is broadcast or multicast to UEs of the first type, the second type, or a combination thereof.
17. The apparatus of claim 1 , wherein the second CORESET and second SS sets are further configured for at least one of a random access procedure, paging, small data transmission and reception, or positioning and DRX.
18. An apparatus for wireless communication at a network entity, comprising:
memory comprising computer-executable instructions; and
one or more processors configured to, individually or collectively, execute the computer-executable instructions and cause the apparatus to:
transmit, to a user equipment (UE) via a master information block, a configuration for a first downlink (DL) bandwidth part (BWP), a first control resource set (CORESET) configured on the first DL BWP, and one or more first search space (SS) sets within the first CORESET, wherein the UE comprises a UE of a first type having a first set of capabilities, and wherein the first CORESET and the first SS sets are configured for use by UEs of the first type and UEs of a second type having a second set of capabilities;
transmit, to the UE, a configuration for a second DL BWP via system information on the first DL BWP, a second CORESET configured on the second DL BWP, and one or more second SS sets within the second CORESET configured on a second DL BWP, wherein the configuration for the second DL BWP indicates at least one of:
a location, numerology and bandwidth of the second DL BWP;
that the second CORESET and second SS sets are configured for the at least one of idle mode or inactive mode procedures in the second DL BWP;
a discontinuous reception (DRX) configuration;
a criteria for measurements relaxation; or
configuration information for one or more DL reference signals transmitted in the second DL BWP; and
participate, with the UE, in one or more of a cell selection or cell re-selection procedure, based on signaling transmitted on the second DL BWP, while the UE is in an idle state or an inactive state, wherein the second DL BWP is configured for dedicated use by UEs of the first type.
19. The apparatus of claim 18 , wherein the second CORESET and second SS sets are configured for reception of multicast and broadcast messages.
20. The apparatus of claim 18 , wherein:
the configuration information for the one or more DL reference signals transmitted in the second DL BWP comprise at least one of: cell defining (CD) synchronization signal blocks (CD-SSBs), non-cell defining SSBs (NCD-SSBs), channel state information (CSI) RS, phase tracking RS (PTRS), positioning RS (PRS), or other DL RSs.
21. The apparatus of claim 20 , wherein the idle mode or inactive mode procedures in the second DL BWP comprise at least one cell selection or cell re-selection procedures based on one or a combination of:
the CD-SSBs, the NCD-SSBs, the other DL RSs, or a combination thereof.
22. The apparatus of claim 21 , wherein the one or more processors are further configured to, individually or collectively, execute the computer-executable instructions and cause the apparatus to:
determine a resource mapping for a common CORESET associated with system information acquisition of cell selection or re-selection, wherein the resource mapping for the common CORESET is determined based on an index of a look up table (LUT) associated with a numerology of the CD-SSBs and a numerology of the common CORESET and the index of the LUT is determined based on a demodulation reference signal (DMRS) scrambling ID, a payload of a physical broadcast channel (PBCH) in the CD-SSB, or a combination thereof.
23. The apparatus of claim 22 , wherein:
the other DL RSs are quasi co-located (QCL'ed) with at least one of the CD-SSBs or the NCD-SSBs; and
the other DL RSs are suitable for spatial relation configuration of uplink (UL) resources in an UL BWP linked to the second DL BWP.
24. The apparatus of claim 22 , wherein the cell selection or cell re-selection procedures are based on at least one of reference signal received power (RSRP) or reference signal received quality (RSRQ) measurements based on at least one of the CD-SSBs, the NCD-SSBs, or the other DL RSs.
25. The apparatus of claim 18 , wherein:
the configuration information for the one or more DL reference signals transmitted in the second DL BWP includes transmission parameters and availability indication;
the transmission parameters are obtainable in one or more of the first DL BWP or the second DL BWP; and
the availability indication is provided to UEs of the first type separately via at least one of: system information, radio resource control (RRC) message, medium access control (MAC) control element (CE), or downlink control information (DCI).
26. The apparatus of claim 18 , wherein the second CORESET and second SS sets are further configured for at least one of a random access procedure, paging, small data transmission and reception, or positioning and DRX.
27. A method for wireless communication by a user equipment (UE), comprising:
receiving, from a network entity via a master information block, a configuration for a first downlink (DL) bandwidth part (BWP), a first control resource set (CORESET) configured on the first DL BWP, and one or more first search space (SS) sets within the first CORESET, wherein the UE comprises a UE of a first type having a first set of capabilities, and wherein the first CORESET and the first SS sets are configured for use by UEs of the first type and UEs of a second type having a second set of capabilities;
receiving, from the network entity via system information on the first DL BWP, a configuration for a second DL BWP, a second CORESET configured on the second DL BWP, and one or more second SS sets within the second CORESET configured on a second DL BWP, wherein the configuration for the second DL BWP indicates at least one of:
a location, numerology and bandwidth of the second DL BWP;
that the second CORESET and second SS sets are configured for at least one of idle mode or inactive mode procedures in the second DL BWP;
a discontinuous reception (DRX) configuration;
a criteria for measurements relaxation; or
configuration information for one or more DL reference signals transmitted in the second DL BWP; and
performing one or more of a cell selection or cell re-selection procedure, based on signaling received on the second DL BWP, while the UE is in an idle state or an inactive state, wherein the second DL BWP is configured for dedicated use by UEs of the first type.
28. The method of claim 27 , wherein the second CORESET and second SS sets are configured for reception of multicast and broadcast messages.
29. A method for wireless communication by a network entity, comprising:
transmitting, to a user equipment (UE) via a master information block, a configuration for a first downlink (DL) bandwidth part (BWP), a first control resource set (CORESET) configured on the first DL BWP, and one or more first search space (SS) sets within the first CORESET, wherein the UE comprises a UE of a first type having a first set of capabilities, and wherein the first CORESET and the first SS sets are configured for use by UEs of the first type and UEs of a second type having a second set of capabilities;
transmitting, to the UE, a configuration for a second DL BWP via system information on the first DL BWP, a second CORESET configured on the second DL BWP, and one or more second SS sets within the second CORESET configured on a second DL BWP, wherein the configuration for the second DL BWP indicates at least one of:
a location, numerology and bandwidth of the second DL BWP;
that the second CORESET and second SS sets are configured for at least one of idle mode or inactive mode procedures in the second DL BWP;
a discontinuous reception (DRX) configuration;
a criteria for measurements relaxation; or
configuration information for one or more DL reference signals transmitted in the second DL BWP; and
participating, with the UE, in one or more of a cell selection or cell re-selection procedure, based on signaling transmitted on the second DL BWP, while the UE is in an idle state or an inactive state, wherein the second DL BWP is configured for dedicated use by UEs of the first type.
30. The method of claim 29 , wherein the second CORESET and second SS sets are configured for reception of multicast and broadcast messages.