Section: B.2 Description of BWP configuration options
Content: There are two possible ways to configure BWP#0 (i.e. the initial BWP) for a UE: 1) Configure BWP-DownlinkCommon and BWP-UplinkCommon in ServingCellConfigCommon, but do not configure dedicated configurations in BWP-DownlinkDedicated or BWP-UplinkDedicated in ServingCellConfig. 2) Configure both BWP-DownlinkCommon and BWP-UplinkCommon in ServingCellConfigCommon and configure dedicated configurations in at least one of BWP-DownlinkDedicated or BWP-UplinkDedicated in ServingCellConfig. The same way of configuration is used for UL BWP#0 and DL BWP#0 if both are configured. With the first option (illustrated by figure B2-1 below), the BWP#0 is not considered to be an RRC-configured BWP, i.e., UE only supporting one BWP can still be configured with BWP#1 in addition to BWP#0 when using this configuration. The BWP#0 can still be used even if it does not have the dedicated configuration, albeit in a more limited manner since only the SIB1-defined configurations are available. For example, only DCI format 1_0 can be used with BWP#0 without dedicated configuration, so changing to another BWP requires RRCReconfiguration since DCI format 1_0 doesn't support DCI-based switching. Figure B2-1: BWP#0 configuration without dedicated configuration With the second option (illustrated by figure B2-2 below), the BWP#0 is considered to be an RRC-configured BWP, i.e. UE only supporting one BWP cannot be configured with BWP#1 in addition to BWP#0 when using this configuration. However, UE supporting more than one BWP can still switch to and from BWP#0 e.g. via DCI normally, and there are no explicit limitations to using the BWP#0 (compared to the first option). Figure B2-2: BWP#0 configuration with dedicated configuration For BWP#0, the BWP-DownlinkCommon and BWP-UplinkCommon in ServingCellConfigCommon should match the parameters configured by MIB and SIB1 (if provided) in the corresponding serving cell. If an (e)RedCap-specific initial DL BWP is configured, for BWP switching, the BWP #0 always maps to the (e)RedCap-specific initial DL BWP. If a RedCap-specific initial UL BWP is configured, for BWP switching on NUL, the BWP #0 always maps to the RedCap-specific initial UL BWP, for BWP switching on SUL, the BWP#0 always maps to the initial UL BWP.