Massive MIMO AAU Field Trial - ofca.gov.hk€¦ · to normal 2x2 MIMO antenna with RRU under 8 selected locations for throughput test (The final cell throughput improvement will be

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Massive MIMO AAU Field Trial

Version: 2.0

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Revision History

Revision Date Previous Revision Date

Summary of Changes

Changes Marked

27-Nov-2017 N/A V1.0 N/A

10-Apr-2018 27-Nov-2017 V2.0 N/A

Approvals

Name Signature Title Date of Issue Version

2.0


Contents

1. INTRODUCTION .................................................................................................................................. 4

2. TRIAL SET UP ...................................................................................................................................... 4

3. TEST ITEMS ......................................................................................................................................... 8

4. TEST RESULT ...................................................................................................................................... 9

4.1. TEST 1 – CELL THROUGHPUT COMPARISON ....................................................................... 9

4.2. TEST 2 – MAXIMUM THROUGHPUT ....................................................................................... 12

4.3. TEST 3 – COVERAGE PATTERN ............................................................................................... 14

5. CONCLUSION..................................................................................................................................... 16

6. EQUIPMENT PARTICULARS ......................................................................................................... 16


1. Introduction

With the demand for high user throughput in limited radio spectrum, Massive

MIMO AAU is the solution to use a large number of built-in antennae to set up

dedicated connections to different users by sharing the same radio spectrum. In

this field trial, Massive MIMO AAU (AAU5980) is set up to provide 32x32 MIMO

capabilities to connect 8 devices to demonstrate the capacity gain of Massive

MIMO AAU solution. Performance of 2x2 MIMO antennas with RRU is taken as

baseline scenario to compare with that of Massive MIMO AAU in term of capacity

gain.

2. Trial Set Up Test Period: 30/October/2017 – 04/November/2017

Site Location


Site Setup

2x2 MIMO antenna with RRU

(Before)

Massive MIMO AAU – AAU5980

(After)

Thank you

Test Zone

AAU installed

here


Massive MIMO AAU and 2x2 MIMO Antenna with RRU are installed next

together for easy comparison.


Configuration

Configuration 2x2 MIMO

antenna with RRU (Before)

Massive MIMO AAU (After)

MIMO 2x2 32x32

Frequency Band 1800MHz 1800MHz

Technology 4G 4G PLMN

Broadcasting 45400/45419 45420

TM 4 4

Antenna Pattern

2x2 MIMO antenna with RRU (Before)


horizontal beam width (degree) 60 18 per beam (Total 8

beams)

Vertical beam width (degree) 12 9.5

Antenna gain (dBi) 15 19.3


3. Test Items

During the trial, cell throughput, maximum throughput and coverage pattern were tested

Item Description Details Expected result

1 Cell throughput comparison

1) Select some points within the test area 2) Performs throughput test at these points before and after AAU is installed

Aggregated throughput is higher when AAU is used

2 Maximum throughput

1) Select the best coverage point for RRU and AAU respectively 2) At the best coverage point performs single user throughput test

Maximum user throughput attained by RRU is higher

3 Coverage pattern Use radio scanner or Test UE to record the coverage of AAU

Coverage is similar to the AAU specification


4. Test Result

4.1. Test 1 – Cell Throughput comparison Test points were selected to achieve the best cell throughput performance as shown in Figure 1.

Figure 1: 8 Test Points

8 test points shown above were located by make sure it can achieve best throughput. In each individual test point, the test device was set up as shown in Figure 2 and running FTP download test from an internal FTP server.


Figure 2: Test Setup

When test device is connected to 2x2 MIMO antenna with RRU, FTP file download is performed. When all the devices started ftp download, cell throughput is obtained from cell throughput monitoring tool and the result is shown in Figure 2a. 2x2 MIMO antenna with RRU (cell throughput)

Figure 2a: Cell throughput when using 2x2 MIMO antenna with RRU

After 2x2 MIMO antenna with RRU test is completed, we reconnect the test devices to Massive MIMO AAU, FTP file download is then performed. When all


the devices started ftp download, cell throughput is obtained from cell throughput monitoring tool and the result is shown in Figure 2b. Massive MIMO AAU (cell throughput)

Figure 2b: Cell throughput when using Massive MIMO AAU

Result:

Item Description Details Expected result Actual result

1 Cell throughput comparison

1) Select some points within the test area 2) Performs throughput test at these points before and after AAU is installed

Aggregated throughput is higher when AAU is used

4.8 times increase in total cell throughput comparing 2x2 MIMO antenna with RRU (Before) and Massive MIMO AAU (After)


4.2. Test 2 – Maximum Throughput The maximum throughput test points for 2x2 MIMO antenna with RRU and Massive MIMO AAU were shown in Figure 3

Figure 3: Maximum Throughput Test Points


In the field trial, speed test was carried out to check the maximum throughput; the results were shown in Figure 4 and 5 where 2x2 MIMO antenna with RRU configuration can achieve better maximum throughput comparing to Massive MIMO AAU configuration.

2x2 MIMO with RRU (Before) Massive MIMO AAU (After)

Average Throughput= 161Mbps Average Throughput=101Mbps

Figure 4 : 2x2 MIMO antenna with RRU Figure 5 : Massive MIMO AAU - Max Throughput -Max Throughput

Result:


2 Maximum throughput test

1) Select the best coverage point for RRU and AAU respectively 2) At the best coverage point performs single user throughput test

Maximum user throughput attained by RRU is higher

maximum throughput is reduced by 37%


4.3. Test 3 – Coverage pattern

Coverage comparison was carried out by using RF scanning as shown in Figure 6 and Figure 7 2x2 MIMO antenna with RRU (Before)

Figure 6: 2x2 MIMO antenna with RRU Coverage Plot



Figure 7: Massive MIMO AAU Coverage Plot Result:


3 Coverage pattern

Use radio scanner or Test UE to record the coverage of AAU

Coverage is similar to the AAU specification

Coverage of Massive MIMO AAU was not as good as 2x2 MIMO RRU

- Channel reference power for Massive MIMO AAU Prototype was less than 2x2 MIMO antenna with RRU

- Limited in beaming forming performance with Massive MIMO AAU Prototype


5. Conclusion

1) Massive MIMO AAU cell can increase the cell throughput by 4.8 times comparing

to normal 2x2 MIMO antenna with RRU under 8 selected locations for throughput

test (The final cell throughput improvement will be subject to the test locations of

the users).

2) The peak user throughput of Massive MIMO AAU is 37% lower than peak user

throughput of 2x2 MIMO antenna with RRU under TM4 mode.

3) Owing to the limitation on transmission power of testing Massive MIMO AAU,

coverage result of Massive MIMO AAU was found not as good as 2x2MIMO

antenna with RRU.

6. Equipment Particulars

電台細節 Station particulars

設備詳情

Equipment Particulars

頻率及最大頻

差容限 (兆赫 )

Frequency and Maximum Frequency

Tolerance (MHz)

發射

類別

Class of Emission

最大有效

輻射功率

(瓦特 )

Maximum

Effective Radiated

Power (in Watts)

設備特性

Equipment Characteristics

Huawei

AAU 598X

1710-1785MHz (Rx)

1805-1880MHz (Tx)

Maximum Frequency

Tolerance: < 0.05 ppm

20M0V7WEW 100W

3GPP

Release 10

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Massive MIMO AAU Field Trial - ofca.gov.hk€¦ · to normal 2x2 MIMO antenna with RRU under 8 selected locations for throughput test (The final cell throughput improvement will be