Secondary cell activation in new radio system

An apparatus, comprising circuitry configured to:

• receive on a primary cell (PCell) at a user equipment (UE) a first medium access (MAC) control element (CE) for activating a first secondary cell (SCell) and a second SCell for the UE from a base station in a wireless communication system, the first and second SCells operating in a same band, no active serving cell operating on the same band for the UE;
• and
• activate the first and second SCells in parallel in response to having the first SCell as a known SCell, the second SCell as an unknown SCell, and both the first and second SCells operating in the same band that is a frequency range 2 (FR2) band, wherein,
• the activating the first and second SCells in parallel includes:
• receiving on the PCell a second MAC CE for indicating a first transmission configuration indication (TCI) state for receiving one of a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) of the second SCell;
• and
• in response to receiving a third MAC CE on the PCell for activating a semi-persistent (SP) channel state information reference signal (CSI-RS) resource set of the second SCell, performing a channel state information (CSI) reporting process based on the SP CSI-RS resource set activated by the third MAC CE on the second SCell, and
• the first MAC CE for activating the first and second SCells is received in slot n, and a CSI report of the CSI reporting process based on the SP CSI-RS resource set activated by the third MAC CE on the second SCell is transmitted no later than in slot
• n
• +
• T
• HARQ
• +
• T
• a
• ⁢
• c
• ⁢
• t
• ⁢
• i
• ⁢
• v
• ⁢
• a
• ⁢
• tion
• ⁢
• _
• ⁢
• time
• +
• T
• CSI
• ⁢
• _
• ⁢
• reporting
• New
• ⁢
• Radio
• ⁢
• (
• NR
• )
• ⁢
• slot
• ⁢
• length
• ,
• where:
• THARQ denotes a delay between a downlink data transmission associated with the first MAC CE and a corresponding hybrid automatic repeat request (HARQ) acknowledgement,
• TCSI_reporting denotes a delay including an uncertainty period in acquiring a first available downlink CSI resource during the CSI reporting process, processing time for the CSI report, and an uncertainty period in acquiring a first available CSI reporting resource, and
• Tactivation_time denotes an activation delay that is
• 3 ms+max(Tuncertainty_MAC+TFineTime+2 ms,Tuncertainty_SP),
• where,
• Tuncertainty_MAC denotes a period between a reception of the first MAC CE and a reception of a last one of the second MAC CE and a fourth MAC CE, wherein the fourth MAC CE indicates a second TCI state for receiving another one of the PDCCH and the PDSCH of the second SCell,
• TFineTime denotes a period between the UE completing processing of the last one of the second MAC CE and the fourth MAC CE, and a timing of a synchronization signal block (SSB) indicated in the first TCI state, and
• Tuncertainty_SP denotes a period between the reception of the first MAC CE and a reception of the third MAC CE.

A non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform a method, the method comprising:

• receiving on a primary cell (PCell) at a user equipment (UE) a first medium access (MAC) control element (CE) for activating a first secondary cell (SCell) and a second SCell for the UE from a base station in a wireless communication system, the first and second SCells operating in a same band, no active serving cell operating on the same band for the UE;
• and
• activating the first and second SCells in parallel in response to having the first SCell as a known SCell, the second SCell as an unknown SCell, and both the first and second SCells operating in the same band that is a frequency range 2 (FR2) band, wherein the first SCell is the known SCell when the UE has transmitted a,
• the activating the first and second SCells in parallel includes:
• receiving on the PCell a second MAC CE for indicating a first transmission configuration indication (TCI) state for receiving one of a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) of the second SCell;
• and
• in response to receiving a third MAC CE on the PCell for activating a semi-persistent (SP) channel state information reference signal (CSI-RS) resource set of the second SCell, performing a channel state information (CSI) reporting process based on the SP CSI-RS resource set activated by the third MAC CE on the second SCell, and
• the first MAC CE for activating the first and second SCells is received in slot n, and a CSI report of the CSI reporting process based on the SP CSI-RS resource set activated by the third MAC CE on the second SCell is transmitted no later than in slot
• n
• +
• T
• HARQ
• +
• T
• a
• ⁢
• c
• ⁢
• t
• ⁢
• i
• ⁢
• v
• ⁢
• a
• ⁢
• tion
• ⁢
• _
• ⁢
• time
• +
• T
• CSI
• ⁢
• _
• ⁢
• reporting
• New
• ⁢
• Radio
• ⁢
• (
• NR
• )
• ⁢
• slot
• ⁢
• length
• ,
• where:
• THARQ denotes a delay between a downlink data transmission associated with the first MAC CE and a corresponding hybrid automatic repeat request (HARQ) acknowledgement,
• TCSI_reporting denotes a delay including an uncertainty period in acquiring a first available downlink CSI resource during the CSI reporting process, processing time for the CSI report, and an uncertainty period in acquiring a first available CSI reporting resource, and
• Tactivation_time denotes an activation delay that is
• 3 ms+max(Tuncertainty_MAC+TFineTime+2 ms,Tuncertainty_SP),
• where,
• Tuncertainty_MAC denotes a period between a reception of the first MAC CE and a reception of a last one of the second MAC CE and a fourth MAC CE, wherein the fourth MAC CE indicates a second TCI state for receiving another one of the PDCCH and the PDSCH of the second SCell,
• TFineTime denotes a period between the UE completing processing of the last one of the second MAC CE and the fourth MAC CE, and a timing of a synchronization signal block (SSB) indicated in the first TCI state, and
• Tuncertainty_SP denotes a period between the reception of the first MAC CE and a reception of the third MAC CE.