Content for TR 38.861 Word version: 17.0.0

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1 Scope p. 6

The present document is a technical report for Study on high power UE (power class 2) for one NR FDD band. The study includes the SAR scheme(s), interference issues, UE implementation issues, and system performance evaluations.

The example bands used for the study are NR band n1 and n3.

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

[3]

3GPP R4-2111528: "n3 50MHz REFSENS, A-MPR". 3GPP RAN WG4 Meeting#99-e, Skyworks Solutions, Inc.

[4]

3GPP R4-2114695: "n3 PC2 MSD". 3GPP RAN WG4 Meeting#100-e, Skyworks Solutions, Inc.

[5]

3GPP R4-2112834: "Sensitivity analysis results and UE implementation for PC2 FDD band ". 3GPP RAN WG4 Meeting#100-e, LG Electronics.

[6]

3GPP R4-2112911: "Discussion on interference for HPUE FDD band ". 3GPP RAN WG4 Meeting#100-e, ZTE Corporation.

3 Definitions of terms, 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. 6

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

3.3 Abbreviations p. 6

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.

4 Background p. 7

4.1 Justification p. 7

Increasing the transmit power of UE has significant benefits on extending cell coverage area and improving the experience of cell edge users. In rel-16 one study item and two work items related to HPUE have been proposed and worked on to standardize the requirements for EN-DC scenarios.

However, extension of cell coverage for lower-frequency NR SA FDD band is also important for some operators considering data throughput for cell edge users is not satisfactory even in FDD bands, and further increasing the UE transmit power would be beneficial for improving the performance of cell edge users. Increasing the transmission power will be beneficial for extending uplink coverage. SAR compliance schemes should be considered (e.g. Existing duty cycle based solution could be taken into consideration for this study, other solutions are not precluded.).

This Study Item is proposed to solve SAR issues, and potentially enable Power Class 2 UE for one FDD band with 26 dBm maximum output power (UE types include smart phone, FWA, etc.). NR band n1 and n3 shall be used as example band for this study.

4.2 Objective p. 7

The objectives of the SI are as follows:

Study the applicable scheme(s) for new power class 2 UE for one NR FDD band to comply with the SAR limits with 26dBm UE Tx power, the example band for this study is NR band n1 and n3.
1. Study candidate SAR solutions, e.g. P-MPR, duty cycle capability, etc.
2. Study regulatory requirements related to 26dBm Tx power in FDD bands including SAR.
NOTE:
Prioritize studies for the existing SAR solutions.
Study interference issues (e.g. self-desense, cross device coexistence…).
1. Study RF requirements for PC2 UE in FDD band, including self-desense requirements, Tx requirements such as A-MPR, and so on.
2. Study adjacent channel co-existence for FDD band.
3. Investigate issues related to in-device interference, if identified.
Study UE implementation related issues such as RF component feasibility to support 26dBm output power in band n1 and n3 at first. Other example FDD bands are not precluded, if needed.

Evaluate system performance gains on spectrum efficiency, and other metrics if needed could also be taken into account, to support NR FDD HPUE.

5 SAR Scheme p. 7

To accommodate the SAR limits of the NR PC2 FDD High Power UE, both UE-based and network-based solutions are considered in the study phase. For UE-based solution, the UE implementation based mechanism is used to ensure SAR compliance. In addition to UE-based solution, an optional method of reporting duty-cycle capability was also intensively discussed, but there is no conclusion reached.