Trial test report 3.5 GHz band’s RF characteristics at indoor location · 2019-05-10 · 2.1.1. LTE base station (Huawei RRU3278) Technical standard LTE 3GPP Release 10 Working

Test Report – 3.5GHz radio propagation characteristics @indoor

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Trial test report

- 3.5 GHz band’s RF characteristics

at indoor location

HTCL

8th

Mar., 2018


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1. Introduction

To get familiar with the radio propagation characteristics over 3.5 GHz band (i.e. 3400-3600

MHz) in Hong Kong, HTCL has conducted a technical trial with the concerned spectrum

deployed over a LTE testbed setup at an indoor shopping arcade and conducted field tests to

collect the coverage and throughput data with a LTE CPE used in 2H 2017.

The testbed ran over air interface is using 3GPP LTE technology.

2. Trial Setup

2.1. Test Equipment

2.1.1. LTE base station (Huawei RRU3278)

Technical standard LTE 3GPP Release 10

Working frequency band LTE Band 42 (3400-3600MHz)

Frequency channel bandwidth LTE 10MHz, 15MHz, 20MHz

Maximum IBW(MHz) 160 MHz

Maximum OBW(MHz) 80 MHz

Maximum transmit power 16W (IBW= 160 MHz) of each RF channel

128W (IBW= 160 MHz) of the Eight RF Channels

Carrier Configuration

SA 2 / SSP 7

20 MHz carrier bandwidth

3pcs of carrier frequencies were tested

Center Freq (MHz) = 3410, 3500, 3590 MHz


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2.1.2. LTE device CPE (Huawei B5318-42)

Technical standard LTE 3GPP Release 10 (Cat. 6)

Working frequency band LTE Band 42 (3400-3600MHz)

Frequency channel bandwidth LTE 5MHz, 10MHz, 15MHz, 20MHz

Maximum transmit power LTE, 23dBm(±2dB)

Build-in LTE Antenna

Frequency, Band 42(3400-3600MHz)

Efficiency, ≥ 50%

Gain, 8 dBi

Type, Directional Antenna

2.1.3. Rohde & Schwarz TSMW Universal Radio Network Analyzer


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2.2. Test schematic diagram on the system configuration

2.3. Test location map of the transmitter(s) and the antenna(e)

Location : The Pacifica Mall, Lai Chi Kok

Testing Area : Indoor shopping areas and entrances


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3. Test Cases

IMT LTE standalone test

Using LTE technology at 3400-3600 MHz spectrum;

Using LTE CPE : testing DL & UL speed at cell center / middle / edge within this

indoor environment to measure the required radiated power of LTE base station to

support normal operation at LTE CPE;

Using RF scanner : testing the received signal strength within this indoor areas and at

the exit to outdoor environment.


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4. Test Results

4.1. Testing using LTE CPE

Testing locations

RRU Tx Power

per port

Pass Loss

(RRU <-> Antenna) Antenna Gain EIRP Total

16 W 17.4 dB 4 dB 1.44 W

a) Center Frequency = 3410 MHz

Locations RSRP

(dBm)

RSSI

(dBm)

SINR

(dB)

DL T'put

(Mbps)

UL T'put

(Mbps)

center 1 -53 -51 37 53.15 9.15

center 2 -59 -51 38 53.16 8.5

middle 1 -79 -61 38 53.07 8.26

middle 2 -103 -81 17 40.48 2.24

edge 1 -112 -89 10 18.36 0.38

edge 2 -116 -91 6 12.01 0.18

b) Center Frequency = 3500 MHz

Locations RSRP

(dBm)

RSSI

(dBm)

SINR

(dB)

DL T'put

(Mbps)

UL T'put

(Mbps)

center 1 -55 -51 29 53.14 9.03

center 2 -54 -51 38 53.12 9.16

middle 1 -86 -67 27 52.91 7.71

middle 2 -96 -73 19 38.05 1.71

edge 1 -108 -85 8 31.07 0.87

edge 2 -112 -87 5 20.81 0.14


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c) Center Frequency = 3690 MHz

Locations RSRP

(dBm)

RSSI

(dBm)

SINR

(dB)

DL T'put

(Mbps)

UL T'put

(Mbps)

center 1 -53 -51 38 52.81 9.01

center 2 -66 -51 37 53.11 8.65

middle 1 -81 -69 32 50.53 6.36

middle 2 -95 -77 19 43.21 2.77

edge 1 -106 -83 9 26.45 0.58

edge 2 -110 -87 6 22.65 0.24

4.2. Testing using scanner

a) TD3500 Coverage Details


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b) Partition Test and Result

Scenario Partition Loss (dB)

Single glass wall (A) 33.68 Shadow corner (B) 23.14 Single brick wall (C) 29.46 Block by column (D) 22.42

Point A

Point B Point C

Point D


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5. Conclusion

The measurement results obtained in the trial reflected a satisfactory max. downlink throughput

of 53 Mbps achieved under an excellent indoor LOS environment (under a 20MHz bandwidth

TD-LTE carrier, with 3:1 DL-to-UL ratio and without MIMO configuration), and with 15~20

Mbps max. downlink throughput recorded under cell edge condition. The performance varied in

accordance with different LOS and NLOS locations, which associated to the SINR qualities

recorded.

By integrated into indoor DAS, general propagation loss of TD-LTE3500 was recorded at around

10dB @ every 10m distance from the transmitting antenna. The penetration loss was getting

large on single glass wall and single brick wall, whilst 5~10 dB smaller at shadowed corner /

blocked by column.

Overall, the trial results serve the purpose of showing the RF characteristics of 3.5GHz at indoor

environment.

Documents

Trial test report 3.5 GHz band’s RF characteristics at indoor location · 2019-05-10 · 2.1.1. LTE base station (Huawei RRU3278) Technical standard LTE 3GPP Release 10 Working