Content for TR 38.833 Word version: 17.0.0

3.1 Terms 3.2 Symbols 3.3 Abbreviations
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1 Scope p. 6

The present technical report documents the Phase I study outcome on inter-user interference suppression for NR MU-MIMO and techniques to cope with LTE CRS interference for NR UE, with the detailed objectives as follows:

MMSE-IRC receiver for suppressing intra-cell inter-user interference
- Phase I: Evaluate the performance under practical MU-MIMO interference profile for the candidate reference receiver.
  - Identify practical MU-MIMO interference modelling methodology
  - Reference receiver: MMSE-IRC receiver. Use the DMRS-based interference covariance estimation method as a starting point
  - Prioritize slot-based transmission scenario
Evaluate techniques to cope with CRS interference in scenarios with overlapping spectrum for LTE and NR
- Candidate reference receiver to enable neighboring cell CRS-IM
  - The performance benefit of neighboring cell LTE CRS-IM over the existing rate matching solutions specified in Rel-15 and Rel-16 shall be evaluated.
  - Feasibility of the considered solution regarding NR PDSCH processing timeline need to be checked.
  - Priority will be given to solutions not having RAN1 specification impact.
- Synchronous network scenario is prioritized. As second priority, RAN4 could evaluate the feasibility and usefulness of the asynchronous network scenario and specify if feasible and useful.
- 15 kHz SCS for NR is prioritized. RAN4 should evaluate the feasibility and usefulness of 30 kHz SCS for scenarios with LTE and NR deployed in neighboring BSs/areas and specify if feasible and useful.

2 References p. 6

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]

TS 38.214: "NR: Physical layer procedures for data".

3 Definitions, symbols and abbreviations p. 6

3.1 Terms p. 6

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. 7

Void

3.3 Abbreviations p. 7

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.

Aggregation level

Antenna port

BWP

Bandwidth part

CBW

Channel bandwidth

CDM

Code division multiple

CORESET

Control resource set

CRS

Cell-specific reference signal

CRS-IC

CRS interference cancellation

CRS-IM

CRS interference mitigation

CRS-RM

CRS rate matching

CSI-RS

Channel state information reference signal

DMRS

Demodulation reference signal

DSS

Dynamic spectrum sharing

FD-CDM

Frequency division - code division multiple

ISD

Inter-site distance

MMSE-IRC

Minimum mean square error - interference rejection combining

MMSE-MRC

Minimum mean square error - maximal ratio combining

MU-MIMO

Multi-user MIMO

NZP

Non-zero-power

PSS

Primary synchronization signal

PT-RS

Phase-tracking reference signal

QCL

Quasi co-location

Resource block

RSRP

Reference signal received power

SCS

Subcarrier spacing

SINR

Signal-to-interference-and-noise ratio

SSB

Synchronization signal block

SSS

Secondary synchronization signal

TBS

Transport block size

TCI

Transmission configuration indicator

TDL

Tapped delay line

Transmission mode