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QUALCOMM today announced it has successfully demonstrated the full mobility of Internet protocol (VoIP) calls over 1xEV-DO Rev. A networks, including mobile, pedestrian and fixed. EVDO (Wikipedia), is a wireless radio broadband data standard adopted by many CDMA mobile phone service providers
The increased upstream capability of Rev A for EV-DO networks (used by Sprint and Verizon) enables them to migrate voice services to Internet protocol (IP)-based platforms for a common service platform.
Previously, an evolutionary strategy to EV-DV (Data + Voice) architecture was planned, but when EV-DO (Rev. A) was announced, Verizon and Sprint dropped their EV-DV technology plans. Now EV-DO Rev. A is the way Verizon and Sprint are expected to move forward.
Field tests involved 62 simultaneous calls in one sector within a single 1.25 MHz channel - in a fully mobile configuration. The test network demonstrated capacity gains approximately 30 times greater than mobile analog voice. Results from a fully loaded commercial network could be somewhat lower.
QUALCOMM says these field tests validate the quality and capacity of full mobility VoIP over EV-DO Rev. A and pave the way to large scale commercial trials by network operators.
“Operators globally have committed to the rapid deployment of CDMA2000 EV-DO Rev. A. These tests prove EV-DO Rev. A's capability for delivering high-capacity, high-quality VoIP over 3G mobile broadband networks,” said Dr. Roberto Padovani, chief technology officer of QUALCOMM.
VoIP over EV-DO Rev. A leverages session initiation protocol, commonly referred to as SIP, in combination with a number of advanced techniques to achieve quality of service comparable to traditional landline voice.
QUALCOMM also helps bring IP Multimedia Subsystem (IMS) strategies to fruition. Operators will be able to efficiently merge their wireless and wireline networks based on IMS. By basing all communications services on an IP network, operators are able to use their network capacity in a much more flexible manner, through the dynamic allocation of capacity to an ever-increasing array of 3G services, such as:
- Push to talk, which is VoIP offered as walkie-talkie-like service;
- Packet-based video telephony, which combines realtime video with VoIP; and
- Simultaneous VoIP calls and data sessions.
While the downlink speed increases from 2.4Mb/s (in Rev. 0) to 3.1 Mb/s (in Rev. A), most of the improvement is in the uplink (reverse link) data rate, increasing dramatically from .15 Mb/s to 1.8 Mb/s in EV-DO Rev A. Low latency is also improved at 50ms compared to approximately 150ms for Rev. 0.
EVDOinfo.com, EVDOforums and 3G News have more.
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