Tony Fang 方士庭

Challenge of Antenna System Design and OTA Test

for 5G NR mmWave Mobile Devices

Outline – 3GPP RAN4 status

5G spectrum

OTA test scope

– Challenge of antenna system design

EIRP Spherical coverage

Hand/body Effect

– Challenge of OTA test

Development stage

Production stage

– Summary

2

OTA Test Plan

OTA Spec

OTA Test Scope

3GPP RAN4/RAN5 status

3

RAN5 Testability

RAN4 Core part

RAN4 Perf. part

Q1

’18 ’19/6

Q2 Q4

’19

Q3 Q1 Q2

’17

Q4 Q3 Q1 Q2

Operating Band

5G spectrum in mmWave band

20 GHz 40 GHz 30 GHz 70 GHz 60 GHz

….. (n257) 26.5 - 29.5

(n258) 24.5 - 27.5

(n260) 37.0 - 40.0

(proposal) 37.0 - 42.5

64.0 - 71.0

Operating Band _ Defined

Approved NR bands

Band number UL DL Duplex mode

n257 26.5 –29.5 GHz 26.5 –29.5 GHz TDD

n258 24.25 – 27.5 GHz 24.25 – 27.5 GHz TDD

n260 37–40 GHz 37–40 GHz TDD

Operating Band _ Proposed

5

Company Tdoc No. (Year/Month): Proposal Status

CMCC, China Unicom, China Telecom, CATT, ZTE, Huawei, HiSilicon

R4-1707851 (2017/8): Proposal: Extent 37-40GHz to 37-42.5GHz

Noted

China Telecom R4-1708000 (2017/8): Proposal: Extent 37-40GHz to 37-42.5GHz

Noted

Huawei, Hisilicon R4-1710707 (2017/11): Proposal: It is proposed to define a new NR band covering 37-43.5 GHz

Noted

NR band definitions for China

OTA Test Scope Only OTA requirement should be specified > 24 GHz

Detailed RF compliance setting is under discussion.

* R4-1701520

* R4-1701518

OTA Spec. _ EIRP EIRP for Spherical Coverage

1. The power class value is defined as the peak EIRP and is band dependent • Baseline definition: the peak EIRP requirement is defined as the minimum value

with no tolerance; it is bounded by the range of values between 22 dBm and 30.2 dBm

2. Agreement on the peak EIRP for handheld UEs is sufficient to complete the power class requirement by Dec 2017 *R4-1711895

1. November ’17

• Finalize the peak EIRP requirement for handheld Ues

2. February ’18

• Initial discussion of measurement results for prototype devices

3. May ’18

• Finalize the spherical coverage requirement for handheld UEs

Milestones for EIRP spec.

OTA Test Plan _ Proposed

TRP measurement

OTA methodology is under discussion, and full test plan would be later.

R4-1710497

On the clarification of beam configuration for TRP measurement Option 1 : Arbitral direction or Pre-defined direction Option 2 : Beam direction where TRP becomes maximum <- Excluded from the candidates of TRP measurement. Option 3 : Measure the TRP for each available beam configurations assuming UEs have discrete beam configurations Option 4 : Beam direction where EIRP becomes maximum Option 5 (New proposal from Sony) : Measure the TRP par each antenna array with one beam direction par array. (Could be included in opt 1 as Ericsson commented.)

9

Spherical Coverage vs. Beamforming Performance System Topology

Beamforming pattern

Phase shifter

Ideal coverage

90 deg.

EIRP Spherical Coverage

Minimum EIRP spherical coverage

0 deg.

Hand/Body Effect

10

Requirements: • EM Simulation tool: with hand phantom in mmWave band • Body tissue simulating liquids : support to mmWave band • Chamber: measurement with hand/head phantom

Without Head With Head Without hand With Hand

ANT

In mmWave band

11

Air Loss

DUT

Requirement • FF/NF, Phone size DUT • Acceptable power/phase variation @ quiet zone • Dynamic range 80 dB (chamber loss < 50 dB)

Quiet Zone

Temperature Humidity

Cable Loss

Challenge of OTA Test

EM Simulation Tool • Accuracy, efficiency • Optimization for antenna

array • System evaluation for EIRP

CDF • Phantom simulation in

mmWave band

Certification Lab. • 5G standard

Measurement • Anechoic chamber for OTA

solution in a) Development stage b) Production stage

• Pre-test before field trials • Measurement with Phantom • Time-saving test

Material • Thermal • Antenna/RF layers

Phantom • Hand/head • Body tissue simulating

liquids

Summary

Collaborations for 5G Platform Ecosystem

5G chipset with antenna array