CDMA2000 1xEV-DO
CDMA2000 1xEV-DO (1x Evolution Data ) is a third- (3G) wide-area wireless that delivers high-speed mobile data services. Wireless service providers on a global are adopting EV-DO and are revolutionizing mobile broadband for millions of subscribers. Delivering peak data speeds above 2 and an average data throughput of 300-600 Kbps, EV-DO networks support a wide range of innovative mobile broadband information, and applications. EV-DO is of the CDMA2000 family of ITU-approved, IMT-2000 (3G) standards developed to enable high wireless and data services. CDMA2000 technologies have been deployed by over 257 operators worldwide and serve over 438 million subscribers. (Source: CDMA Group, 2008)

CDMA2000 1xEV-DO Rev A

CDMA2000 1xEV-DO Rev A, the latest commercial of EV-DO , increases the peak data transmission download speed to 3.1 , the peak upload speed to 1.8 and enables -based services such as , push-to-talk and over a wireless IP .


EV-DO Rev-0 maximizes user data rates and optimizes capacity utilization through sophisticated rate adaptation, macro-diversity and multiplexing schemes. Unlike other technologies that provide a constant fixed data rate, an EV-DO system constantly monitors channel conditions and adapts the data rate upward as conditions improve. EV-DO uses a packet-based Time Division Multiplexing (TDM) scheme that ensures traffic is efficiently multiplexed over the forward , and sector capacity is dynamically allocated in a matter of milliseconds. Optimizing the allocation of resources – particularly during peak traffic periods – improves the overall throughput for each active subscriber. In addition, EV-DO employs a powerful error-correction scheme, which optimizes performance.

CDMA2000 1xEV-DO

  • CDMA2000 3G Standard
  • 1.25 Licensed Spectrum
  • 5-15 Km typical cell radius
  • Fully mobile, no line-of-sight required
  • Seamless integration with cdmaOne and CDMA2000 1X networks
  • Easy overlay for TDMA and GSM environments
  • Applications
    • EV-DO Rev 0 – data only
    • EV-DO Rev A – and data
  • Peak rate
    • EV-DO Rev 0 – 2.4
    • EV-DO Rev A – 3.1

EV-DO Rev A support voices services because it provides a fast reverse (uplink) and end-to-end -of-Service (QoS). QoS in 1xEV-DO Rev A is based on flows. A flow is defined by several parameters including its sensitivity to , data rate changes and acceptable packet error rate. The VoIP application, for instance, would use a sensitive flow for its bearer traffic. This -sensitive flow would get priority over a best-effort flow used for email or music download. The application would not only use a sensitive flow for but would also use a rate sensitive flow for the stream to maintain interactivity.

Evolution of CDMA2000 Networks
With 1xEV-DO Rev-A, the focus of CDMA2000 standards has firmly shifted from advancing circuit switched technologies such as 1xRTT to advancing the packet switched , EV-DO.

Beyond 1xEV-DO Rev-A, the next step in the of CDMA2000 standards is the scalable aggregation of multiple 1.25MHz 1xEV-DO Rev A carriers. Called (or Rev B), this enables operators to aggregate multiple 1xEV-DO carriers and deliver higher bandwidth and peak data rates. (For example: If N=3: 3 x 3.1Mbps peak rate per 1.25MHz carrier = 9.3 peak rate). not only allows CDMA2000 operators to effectively compete against technologies such as UMTS that operate in a 5 wide band but also supports the delivery of new, high-bandwidth multimedia applications. EV-DO provides a cost-effective foundation for the of an advanced IP-based broadband wireless and data . Serving a broad base of consumer and business customers, EV-DO networks will continue to evolve and set the pace for innovative wireless , data and multimedia services.

Source: http://www.airvana.com

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