Report on Temporary TD-LTE Demo Site

during May 2011

PMIMO Team

Hong Kong Applied Science and Technology

Research Institute Co. Ltd.

Executive Summary

The Hong Kong Applied Science and Technology Research Institute (ASTRI) was founded by the Government of Hong Kong SAR in 2000 with a mission of enhancing Hong Kong's competitiveness in technology-based industries through applied research. ASTRI has setup a temporary TD-LTE trial site in Hong Kong Science and Technology Park, during a trial period from 3-31 May 2011. The site involved two sets of a base station unit and antennas (locate at the rooftops of Photonic Centre and Lake Side 2 Building in Hong Kong Science Park). This report summarizes the trials carried out in the above event.

Contents

1 Introduction and Background ............................................................................................................... 4

1.1 Purpose of TD-LTE Trial Site......................................................................................................... 4

1.2 Schedule ...................................................................................................................................... 4

1.3 Concerned Parties ....................................................................................................................... 4

1.4 Non-Revenue Generating ............................................................................................................ 4

2 The TD-LTE Trial Network ..................................................................................................................... 5

2.1 Radio Design and Considerations ................................................................................................ 5

2.1.1 RF Equipment and Antenna Compliance ................................................................................ 5

2.1.2 RF Power ................................................................................................................................. 5

2.1.3 Class of Emission ..................................................................................................................... 5

2.1.4 RF Spectrum ............................................................................................................................ 5

2.1.5 Interferences to other equipments ......................................................................................... 5

2.2 Equipment ................................................................................................................................... 6

2.2.1 Base Station ............................................................................................................................. 6

2.2.2 Antenna ................................................................................................................................... 7

2.3 Site Overview ............................................................................................................................... 7

2.4 Network Topology Overview ....................................................................................................... 8

3 Operations and On-going Arrangements .............................................................................................. 9

3.1 Operation ..................................................................................................................................... 9

3.2 Duration and Period .................................................................................................................... 9

4 Test Results ......................................................................................................................................... 10

4.1 Test ............................................................................................................................................ 10

4.2 Coverage Evaluation .................................................................................................................. 10

1 Introduction and Background

1.1 Purpose of TD-LTE Trial Site

The purposes of the TD-LTE trial site are: - To demonstrate and promote TD-LTE technologies. - To provide first-hand experience of TD-LTE technologies to general public. - To showcase the R&D capability of ASTRI.

1.2 Schedule

The trial has been held in 3-31 May 2011.

1.3 Concerned Parties

- ASTRI - HKSTP - OFTA

1.4 Non-Revenue Generating

ASTRI shall use this trial network, equipment and the services solely for technology demonstration and development. ASTRI will not open the trial network for public access and will not generate revenue by operating the site.

2 The TD-LTE Trial Network

2.1 Radio Design and Considerations

2.1.1 RF Equipment and Antenna Compliance

The RF equipments and antenna installed in this trial network shall be complied with 3GPP TD-LTE requirements.

2.1.2 RF Power

The maximum effective radiated power is 23 dBm.

2.1.3 Class of Emission

20M Hz Bandwidth, TDD mode, and will employ various modulation technical (such as QPSK, 16QAM, and 64QAM) according to 3GPP TD-LTE specifications.

2.1.4 RF Spectrum

ASTRI has applied for spectrum license from OFTA: - The target band: licensed band centered at 2.35GHz; - 20MHz bandwidth;

2.1.5 Interferences to other equipments

The TD-LTE trial site operates at the licensed spectrum, as issued by OFTA, has not caused interferences to existing mobile phone network or other RF equipments at the installation locations. To eliminate possible interference to other wireless systems, we have installed our BS and antennas in a location where there is no antenna of other systems (GSM/CDMA) in

the proximity (±2.5m in horizontally, ±1.5m in vertically).

2.2 Equipment

2.2.1 Base Station

Base station specification is as listed below:

• Compliant with 3GPP TD-LTE standard

• 20MHz Bandwidth

• 2Tx/2Rx

• Maximum 10dBm transmit power per ANT port;

• TDD mode

• Adaptive modulation scheme including QPSK, 16QAM and 64QAM The base station includes a RRU (ZXSDR R8840) and a BBU (ZXSDR B8200) as shown in Fig. 1 and Fig. 2 respectively.

Figure 1: Base Station RRU

Figure 2: Base Station BBU

2.2.2 Antenna

Outdoor sectorized antennas will be used. The specifications are listed below: - Frequency range: 2300 – 2400MHz - Peak gain: ~ 15 dBi

- Input impedance: 50Ω

2.3 Site Overview

The TD-LTE base stations will locate in two buildings (labeled as 1, 2a/2b), as shown in Fig. 3.

Figure 3: Site map

2.4 Network Topology Overview

The overall network topology is illustrated in Fig. 4.

Figure 4: Network topology

3 Operations and On-going Arrangements

3.1 Operation

ASTRI will solely own and operate the TD-LTE trial site.

3.2 Duration and Period

The trial has operated from 3-31 May 2011.

4 Test Results

4.1 Test

After setting up the base station in the Hong Kong Science Park, we have first test whether the station affects other wireless services provided in Hong Kong Science Park. Mobile service, Wi-Fi and 3G data services have not been affected.

4.2 Coverage Evaluation

The coverage and capacity of the network have been evaluated with ASTRI’s TD-LTE dongle as user equipment. The results were shown in Figures 4.2-1, 4.2-2 and 4.2-3. Indoor coverage within the park has also been evaluated and the results are shown on Figure 4.2-4.

Figure 4.2-1 Photonics Center Cell ID 60 measurement

Figure 4.2-2 Lake Side 2 section 2A Cell ID 70 measurement

Figure 4.2-3 Lake Side 2 section 2B Cell ID 80 measurement

Figure 4.2-4 Test Road and data of Core Bldg- Enterprise place - Lakeside1- Lakeside2