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IP-RN Applications

Airvana began delivering commercial infrastructure products based on the first generation EV-DO standard known as Rev 0, in 2002. The second generation EV-DO standard, Rev A, and supports push-to-talk, voice-over-IP and faster Internet services. Airvana began delivering Rev A software to operators in 2006 and substantial network operator upgrades to Rev A have taken place already in 2007.

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EV-DO Rev A
1xEV-DO Rev A builds on, and extends, the success of 1xEV-DO Rev 0. It offers broadband upload speeds, Quality of Service (QoS) guarantees for delay and rate sensitive traffic, and low airlink latency. These features are enabling new revenue generating services such as interactive multi-player gaming, packet video telephony, push to talk and voice over IP.

1xEV-DO Rev A increases the peak upload (reverse link) speed to 1.8 Mbps. A fast reverse link enables a shift in the usage model for consumer multimedia services from merely downloading information and entertainment from the Internet to sharing multimedia content created by consumers themselves. The proliferation of high-resolution camera phones and camcorder phones has created hundreds of millions of subscribers who are not only consumers of, but also active producers of, digital content.

A fast reverse link also benefits service providers who are offering EV-DO as an Internet access service for residential broadband or mobile professionals. Subscribers can now rapidly upload photographs, music and large presentations and get an experience comparable to what they experience on wired broadband networks.

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Voice over IP (VoIP) with QoS
Just as broadband adoption propels VoIP adoption, 1xEV-DO wireless broadband will be the driving force behind wireless VoIP. In addition, the wide-scale adoption of VoIP over wireline networks will lower the cost of VoIP over 1xEV-DO solutions.

As an increasing number of service providers roll out 1xEV-DO networks around the world, 1xEVDO Rev A becomes an ideal platform to provide ubiquitous communications and entertainment experiences on the move and on multiple devices (cell phone, laptop, or PDA). Some new wireless VoIP applications are:

• Video Telephony: Simultaneous voice and video
• Push to Talk: Push-to-talk over 1xEV-DO offers high capacity with sub-second call setup.
• Push to Conference: Similar to Push-to-Talk, but full duplex.
• Multi-tasking: A subscriber is able to do large downloads to the mobile device while taking a call.

Enhancements to the 1xEV-DO standard, known as 1xEV-DO Rev A (Revision A), allow service providers to offer voice quality and capacity on par with today’s circuit-switched wireless voice networks. Significant improvements include:

• Quality of Service (QoS): With 1xEV-DO Rev A, applications are assigned varying levels of QoS depending on their importance. VoIP packets are given the highest priority in the network to ensure high-quality voice services.
• Faster Reverse Link: A three-fold increase in average reverse-link sector throughput makes 1xEV-DO Rev A the most symmetric high-speed 3G standard available to enable VoIP services and other highly symmetric services.
• Low Latency Airlink: Several enhancements included in 1xEV-DO Rev A reduce round-trip airlink latency from over 80 ms to about 30 ms.

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EV-DO Rev B
In simplest terms, Rev B extends EV-DO to multi-carrier operation by serving users simultaneously over multiple 1.25 MHz carriers. Rev B offers compelling benefits to a wireless operator and its subscribers.  For example, by multiplexing 3 carriers, Rev B can support 9.3 Mbps downloads.  This represents a 3x improvement over Rev. A in the packet data user experience, which is especially useful in downloading large high definition video, rich multimedia , large files and in Internet browsing.  The Rev B standard supports up to 15 simultaneous carriers for a maximum downlink speed of 45 Mbps.  Rev B is fully backward compatible with existing Rev 0 and Rev A devices. Through their Rev B deployments, operators will be able to gain experience in future 4G user applications.