Simultaneous Rx/Tx band combinations for NR CA/DC, NR SUL and LTE/NR DC

Aug 08, 2022

The LTE_NR_Simult_RxTx work item specifies the principles for simultaneous Rx/Tx UE capability for FDD-TDD or TDD-TDD band combinations s for which can support or not support simultaneous Rx/Tx for FR1, FR2 and FR1+FR2 and for each FDD-TDD and TDD-TDD band combinations for CA, SUL, MR-DC and simultaneous Rx/Tx capability NR-DC band combinations.

911018

Simultaneous Rx/Tx band combinations for NR CA/DC, NR SUL and LTE/NR DC

LTE_NR_Simult_RxTx

RP-221521

The following principles were introduced as part of the Work Item:

Principles for FDD-TDD or TDD-TDD band combinations objectives: To define clear principles for which can support or not support simultaneous Rx/Tx for FR1, FR2 and FR1+FR2.
Principles for CA, SUL, MR-DC and simultaneous Rx/Tx capability NR-DC band combination: Simultaneous Rx/Tx capability for LTE CA band combination can be applied for the corresponding inter-band NR CA band combination. The same simultaneous Rx/Tx capability can be applied for the corresponding band combination among NR CA, NR DC and NR EN-DC.

The latest Status report for the Work Item (RP-221520) reported on agreements approved at 3GPP TSG RAN meeting #96 (June 06-09, 2022), on detailed work from RAN4 Working Group.

See a list of related CRs: select "TSG Status = Approved" in: https://portal.3gpp.org/ChangeRequests.aspx?q=1&workitem=911018,911118

Acronyms:

BCS         Bandwidth Combination Set
CA           Carrier Aggregation
CC           Component Carrier
DC           Dual Connectivity
EN-DC     E-UTRA/NR DC
FDM        Frequency Division Multiplexing
FR            Frequency Range
ENBW     The aggregated bandwidth of an E-UTRA sub-block and an adjacent NR sub-block
MBW      Measurement bandwidth defined for the protected band
MCG       Master Cell Group
NR           New Radio
NS           Network Signalling
NSA         Non-Standalone, a mode of operation where operation of an other radio is assisted with an other radio
RE            Resource Element
RF            Radio Frequency
Rx            Receiver
SCG         Secondary Cell Group
SCS          Subcarrier spacing
SUL         Supplementary uplink
TDM        Time Division Multiplex
Tx            Transmitter
UE           User Equipment
ULSUP    Uplink sharing from UE perspective

3GPP Work Plan:

See a listing of all work & study items here: https://www.3gpp.org/ftp/Information/WORK_PLAN/ and search for ‘Simult_RxTx’ in the acronym field of the Excel sheet there.

The text above is largely taken from the Release 17 description document TR21.917 (clause 18), which is a summary based on RP-221054 (LTE_NR_Simult_RxTx).