Report on Temporary TD-LTE Demo Site in

Admiralty MTR Station

PMIMO Team

Hong Kong Applied Science and Technology

Research Institute Co. Ltd.

23 Aug 2010

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 demo site in Admiralty MTR Station, during the period of ASTRI company road show from 16-20 Aug 2010. This involved temporary setup of a base station unit and antennas (locate within the exhibition booth). This report summarizes the test and demonstration carried out in Admiralty MTR Station.

Contents

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

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

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

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

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

2 The Proposed TD-LTE Demo 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

2.5 Installation Location ................................................................................................................. 9

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

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

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

4 Test and Demonstration Results .................................................................................................... 10

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

4.2 Demonstrations ..................................................................................................................... 10

1 Introduction and Background

1.1 Purpose of TD-LTE Demo Site

The purposes of the TD-LTE demo 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 demonstration has been held in 16-20 August 2010 during the ASTRI company road show in Admiralty MTR station.

1.3 Concerned Parties

- ASTRI - MTR - OFTA

1.4 Non-Revenue Generating

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

2 The Proposed TD-LTE Demo Network

2.1 Radio Design and Considerations

2.1.1 RF Equipment and Antenna Compliance

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

2.1.2 RF Power

The maximum effective radiated power is 10 dBm (fixed attenuator will be attached to the radio unit to avoid higher power).

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 demo 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. A trial has been done with MTR technical team in advance during off-peak hours in Admiralty MTR station. 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

Low –gain omni-directional antennas will be used. The specifications are listed below: - Frequency range: 2500MHz – 2700MHz (can be used in 2300MHz range) - Peak gain: ~ 5 dBi

- Input impedance: 50Ω

2.3 Site Overview

For a temporary road show deployment, the TD-LTE base station (including the antennas) was located within the exhibition booth, as shown in Fig. 3.

Figure 3: Site map, exhibition booth circled in red.

2.4 Network Topology Overview

The overall network topology is illustrated in Fig 4.

Figure 4: Network topology

2.5 Installation Location

Items below have been installed within the indoor booth in Admiralty MTR station: - Base station including the baseband unit (BBU) and radio unit (RRU) - Low-gain omni-directional antenna - RF cable from BS to antenna - Power convertor and power cord

Figure 5: Exhibition booth

2.5.1.1 Power Supply Requirements

The base station requires 220V/50Hz AC.

3 Operations and On-going Arrangements

3.1 Operation

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

3.2 Duration and Period

The demo site has operated from 16-20 Aug 2010.

4 Test and Demonstration Results

4.1 Test

After setting up the base station in Admiralty station, we have first test whether the station affects other wireless services provided in the MTR station. Mobile service, Wi-Fi and 3G data services have not been affected. A throughput test of the TD-LTE data card has been conducted in the indoor area of the MTR station. With the limited transmitted power and undesirable location of the base station antenna, downlink throughput of above 5 Mbps has been achieved at most of the locations tested in the station The demonstration requires 5+ Mbps for both downlink and uplink traffic for at each of the user terminals, in order to provide HD video capability. This has been achieved with very stable data rate.

4.2 Demonstrations

The demonstration has been showed to the public from 16-20 Aug 2010. A demonstration of 4G and 3G comparison has attracted many interested parties from the industry, the academic, the press, and the general public. High definition video conferencing has been used as an application to show the capability of 4G services. Visitors have expressed their interests in establishing partnership, licensing the technologies, and even purchasing the data card (which although is not for sale at this moment).