Content for TR 38.894 Word version: 18.0.0

3.1 Terms 3.2 Symbols 3.3 Abbreviations 4.1 Background information in Rel-17 4.2 WI Objective in Rel-18
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1 Scope p. 8

The present document is a technical report for requirements on simultaneous Rx/Tx band combinations for NR CA/DC, NR SUL and LTE/NR DC.

Requested FDD-TDD, TDD-TDD CA, SUL, MR-DC and NR-DC band combinations for evaluation of supporting simultaneous Rx/Tx capability/operation are provided in the Table below.

Table 1: Band combinations for evaluation of simultaneous Rx/Tx

Band combination	Power Class
CA_n34A-n41A	PC3
CA_n39A-n41A	PC3
CA_n40A-n41A	PC3, PC2
CA_n7A-n40A	PC3

2 References p. 8

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.

[1]

TR 21.905: "Vocabulary for 3GPP Specifications".

[2]

RP-210890: "New WID on New WID on simultaneous Rx/Tx band combinations for CA, SUL, MR-DC and NR-DC".

[3]

RP-222648: "New WID: Simultaneous Rx/Tx inter-band combinations for NR CA/DC, NR SUL and LTE/NR DC in Rel-18".

[4]

TS 38.101-1: "NR; User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone".

[5]

TS 38.101-2: "NR; User Equipment (UE) radio transmission and reception; Part 2: Range 2 Standalone".

[6]

TS 38.101-3: "NR; User Equipment (UE) radio transmission and reception; Part 3: Range 1 and Range 2 Interworking operation with other radios".

3 Definitions of terms, symbols and abbreviations p. 8

3.1 Terms p. 8

For the purposes of the present document, the terms given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2 Symbols p. 9

For the purposes of the present document, the following symbols apply:

3.3 Abbreviations p. 9

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.

ACLR

Adjacent Channel Leakage Ratio

ACS

Adjacent Channel Selectivity

A-MPR

Additional Maximum Power Reduction

BCS

Bandwidth Combination Set

Carrier Aggregation

Component Carrier

Dual Connectivity

EIRP

Equivalent Isotropically Radiated Power

EN-DC

E-UTRA/NR DC

EVM

Error Vector Magnitude

FDM

Frequency Division Multiplexing

Frequency Range

ENBW

The aggregated bandwidth of an E-UTRA sub-block and an adjacent NR sub-block

ITS

Intelligent Transportation System

ITU-R

Radiocommunication Sector of the International Telecommunication Union

MBW

Measurement bandwidth defined for the protected band

MPR

Allowed maximum power reduction

MSD

Maximum Sensitivity Degradation

MCG

Master Cell Group

New Radio

Network Signalling

NSA

Non-Standalone, a mode of operation where operation of an other radio is assisted with an other radio

OOB

Out-of-band

OOBE

Out-of-band emission

OTA

Over The Air

PRB

Physical Resource Block

PSCCH

Physical Sidelink Control Channel

PSSCH

Physical Sidelink Shared Channel

Resource Element

REFSENS

Reference Sensitivity

Radio Frequency

Receiver

SCG

Secondary Cell Group

SCS

Subcarrier spacing

SEM

Spectrum Emission Mask

Sidelink

SUL

Supplementary uplink

TDM

Time Division Multiplex

Transmitter

User Equipment

UL MIMO

Up Link Multiple Antenna transmission

ULSUP

Uplink sharing from UE perspective

4 Background p. 10

4.1 Background information in Rel-17 p. 10

Simultaneous Rx/Tx capability for inter-band CA, SUL and EN-DC band combinations were introduced from Rel-15. Specifically, for inter-band CA and EN-DC combination, the capability is used for TDD-TDD and TDD-FDD band combinations. According to the description of the capability, it is conditional mandatory and the condition is described in the field, i.e. indicated in the RAN4 spec which combinations should mandatorily support simultaneous Rx/Tx. For the combinations which have no such indication, the capability is optional, i.e. for UE supporting simultaneous Rx/Tx, the capability should be reported, otherwise, the capability is absent or not reported. Since the capability is important for network scheduling, it should be reported accurately.

In Rel-17, the principles for judging the mandatory capability for a band combination have been discussed, and the cases include:

FR1+FR1 FDD-TDD band combination
FR1+FR1 TDD-TDD band combination
FR1+FR2 FDD-TDD band combination
FR1+FR2 TDD-TDD band combination
FR2+FR2 TDD-TDD band combination

For some categories, the capability should be checked case by case. Therefore, to facilitate the analysis of specific band combinations, a dedicated WI is needed to avoid the ambiguity for application of the general principles agreed in Rel-17 and the analysis and conclusion should be captured in the TR.

In addition, as the capability is defined for CA, SUL, MR-DC and NR-DC band combinations, and applicability of the corresponding requirements cover different specifications, e.g. TS 38.101-1 and TS 38.101-3, the way to treat simultaneous Rx/Tx capability as well as the requirements should be aligned among the specifications.

The fallback rules are captured as below for reference:

Request for additions of band combinations to this WI shall be provided using an agreed template and sent to the 3GPP_TSG_RAN_WG4_NR_BANDS email reflector before a RAN4 Tdoc submission deadline and no new band combinations are allowed to be requested after the deadline except to correct the missing fallback and add more supporting companies for the proposed band combinations.
When a proponent requests a new band combination, all the next level fallback configurations shall be listed and recorded in the request template and the status ("New", "Ongoing", "Completed") of all the fallback configurations shall be declared accurately and clearly. For "New" fallback configurations, the proponent shall ensure these fallback configurations are also requested together with the higher order band combination in the same meeting.
A band combination configuration can only be considered as completed when all of the fallback configurations are completed and specified in advance or at the same meeting. It is the responsibility of the proponent to ensure the status of all of the fallback mode configurations. Rapporteurs and other companies are encouraged to check the status of all of the fallback configurations once the higher order band combinations are declared as completed.

4.2 WI Objective in Rel-18 p. 10

The objectives of the Simultaneous Rx/Tx inter-band combinations for NR CA/DC, NR SUL and LTE/NR DC WI in Rel-18 are as follows:

Identify feasibility for each requested FDD-TDD and TDD-TDD band combinations for CA, SUL, MR-DC supporting simultaneous Rx/Tx capability/operation based on technical analysis, especially for those with large MSD values.

NOTE 1:
Band combinations considered in this WI have to be introduced first via basket WIs (see 2.3) or completed in previous releases if necessary.

NOTE 2:
Whether the simultaneous Rx-Tx capability could be supported or not depends on the evaluation of MSD for the requested band combinations case by case.
Align the specification treatment of simultaneous Rx/Tx capability for CA, SUL, MR-DC and NR-DC band combinations.