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McWill SCDMA Wireless Access Technology Computer Science Essay

Paper Type: Free Essay Subject: Computer Science
Wordcount: 1517 words Published: 1st Jan 2015

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McWiLL is the most advanced broadband wireless solution provided by Beijing Xinwei Telecommunications Technology. The technology is based on SCDMA, and is known as Multicarrier Wireless information Local Loop (McWiLL). McWiLL combines SCDMA’s traditional use in narrow-band voice and introduces a mobile broadband data service that ties into an IP-based core network. It is based on CS-OFDMA adaptive modulation, and uses dynamic channel allocation and smart antennas to enhance its throughput.

SCDMA is a wireless access technology developed by Beijing Xinwei

Telecom Technology Co., Ltd. The SCDMA air interface is a national wireless access standard in China. The SCDMA products contains a full suite of advanced wireless

communication and networking technologies, such as smart antennas. The key technologies of SCDMA form the foundation of TD-SCDMA, an ITU Standard for 3G Wireless Communications. Earlier SCDMA products are narrowband products focusing on fixed and mobile voice applications. A new generation of SCDMA products are broadband products, Multicarrier Wireless Internet Local Loop (McWiLL), focusing on fixed and mobile voice and high speed data application.

McWiLL has been deployed in several Chinese cities, including Guangzhou and Qingdao, where it’s been used for video, voice and data communication. McWiLL successfully served for 2008 Beijing Olympic Regatta, providing the high-definition, real-time mobile video services. Internationally it has been deployed in more than fifteen countries, such as USA, Cameroon, Nigeria, Ukraine, Malawi, and Mozambique.

McWiLL is a TDD-based wireless access platform that combines SCDMA (synchronous CDMA), CS-OFDM (code spreading orthogonal frequency division multiple access), MIMO and smart antennas, as well as other wireless techniques such as adaptive modulation (up to QAM64), dynamic channel allocation and make-before-break handoff, to offer a high-speed data and voice services. All these features are designed to work with any IP core network and provide up to 15Mbps of data rate using 5MHz of spectrum.


In a way, McWiLL tries to incorporate all of today’s wireless networking techniques into a single platform which is very possibly why it is almost impossible for a normal human to understand.

McWiLL Base Station supports the following features:

(a) Support up to 15Mbps net throughput with 5MHz bandwidth;

(b) Support fixed and mobile, voice and data services;

(c) Support up to 163dB link budget;

(d) Support Make-before-Break handoff and L2 tunnel;

(e) Support QoS and GoS features;

(f) Support Over-the-Air upgrade;

(g) Support low power consumption (150 Watt);

(e) Support VLAN, PPPoE and penetration of private networks


McWill(Multi-carrier Wireless Information Local Loop) is a mobile broadband access system based on SCDMA technology platform.

McWiLL Technology

Smart Antennas

Dynamic Channel Assignment

Code Spread OFDMA (CS-OFDMA)

Time Division Duplex (TDD)

Efficient VoIP Technology

Make-before-Break Baton Handoff

Adaptive Modulation

QoS & GoS

Security & Fraud Protection

McWiLL System Features

Main Services¼šFixed, portable, mobile voice and data communications.

Main Features¼šBTS with 5MHz can support up to 15Mbps net throughput, each sector can support more than 300 simultaneous sessions, supporting high-speed mobility, handoff and roaming, N=1 frequency planning, and low latency.

Product Characteristics:

Support up to 100KM/H mobile speed

Terminals are backward compatible

Support efficient voice communications and low-bandwidth data.

Support N=1×1 deployment.

Products available in the following frequencies:

336-344MHz, 400-430MHz, 698-746MHz,1785MHz-1805MHz, 2150-2180MHz, 2525-2560MHz, 3300-3400MHz

Characteristics of Chinese Rural Areas


Low subscriber density, large separation of villages, far away from urban areas

Complicated environment (mountainous and hilly terrain)

Poor facility (backhaul, power supply, etc.)

Low income

Current wireline/wireless communication systems cannot meet these challenges


Less than $4/month in most areas

Busty traffic

High traffic especially in Chinese traditional holidays

Asymmetric traffic

More incoming calls than outgoing calls

Little usage of value added services

Unique Advantages of Deploying McWiLL

Large coverage enables fewer cell sites which are expensive in developing countries, leading to much lower Capex and Opex. N=1 deployment enables a wide area network with as little as 5MHz spectrum, leading to much lower upfront investment on spectrum which is usually quite expensive. Products with a wide range of frequency allow an operator to choose the most cost effective spectrum to operate. Lower terminal cost and adequate data rates allow an operator to minimize the Opex and lower the entry barriers for a subscriber. Most McWiLL terminals can support both voice and data services. GSM/McWiLL dual mode handsets/PDAs allow an end user to enjoy 3G beyond performance of McWiLL data and cost effective voice without sacrificing easy access advantages of GSM.

Summary of McWiLL Advantages

Large coverage (up to 60Km)

Smart antenna,400MHz frequency band

Low cost

Already large volume, cost effective architecture, SCDMA ASIC chipset, no royalty fees, low R&D cost, low manufacture cost, multiple vendors due to SCDMA Alliance

High capacity

BTS capacity 24Mbps/10MHz¼Œsupporting up to 8,000 voice subscribers

One system fits all

Via flexible configuration, one system can meet the requirements of different user groups (high-end and low-end), services (voice and data), and time (current and future).

Product maturity and reliability

10 years R&D, large scale deployment, redundancy architecture, long time operational networks, an experienced team of installation and customer support.

Easy to install and maintenance

Terminal zero install, easy-to-use tools for customer self debugging, remote access trouble shooting tools for support personnel.


In this presentation, we will first give an introduction of popular

wireless multiplex technologies such as WCDMA and OFDMA and then present

our McWiLL technology which is an optimal integration of WCDMA and OFDMA

technologies to effectively address the technical challenges of wireless

broadband access, such as capacity, coverage, multipath fading, and

intercell interference. In other words, McWiLL effectively avoids the

major drawbacks of WCDMA and OFDMA and draws their advantages of both

technologies. Unlike voice centric WCDMA or data centric OFDMA (WiMax),

the McWiLL wireless broadband access system can efficiently combines

both voice and data applications. Finally, we will provide brief

introduction of McWiLL product roadmap and application.

McWiLL Fits Chinese Rural Markets

• Smart antenna and 400MHz frequency band allows the McWiLL systems to have

large NLOS coverage (up to 60KM).

• Multicarrier BTS can support up to 8,000 voice subscribers having sufficiently high

capacity to support bursty traffic in rural applications.

• Cost effective architecture and SCDMA ASICs allow the McWiLL products to have

sufficiently low cost per line ($60-80 overall cost per line including both terminal and


• Zero install of McWiLL terminals and rich tools for self and remote troubleshooting

make it very easy to deploy the McWiLL systems in rural areas.

• 10 years R&D, redundancy architecture and large-scale deployment (>2 million

subscribers) make the McWiLL products mature and reliable enough to deploy in

remote rural areas.

• Integrated voice and data solutions can allow the McWiLL systems to meet both

current and future service requirements of rural customers.

My opinion

Multicarrier Wireless Internet Local Loop (McWill) is developed by Beijing Xinwei Telecom Technology Co., Ltd. It is a wireless access technology which can cover for the very large area, its coverage can up to 60KM. Therefore it is very suitable for china because it is a big country. It’s been used for video, voice and data communication and successfully served for 2008 Beijing Olympic. Even though McWill is very popular but it cannot be use for every country for example, Singapore. Singapore is a small country if using the technology of McWill, there will be a lot of wasted.


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