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CDMA2000 Performance

CDMA2000 technologies offer the highest voice capacity and mobile data throughput performance in the industry using the least amount of spectrum, which lowers the cost of delivery for operators and provides a superior customer experience for the end users.

  • Superior Voice Capacity: CDMA2000 1X is the most spectrally efficient 3G technology for circuit-switch voice. Initially, 1X can supported 33-35 simultaneous voice calls per sector in a single 1.25 MHz channel - with some operators reporting 38-40 voice calls. With the introduction of an EVRC-B codec and handset interference cancellation, 1X voice capactiy increased it can handle up to 55 voice calls.

    The 1X Advanced standard quadruples the initial voice capacity of CDMA2000 1X through the implementation of additional interference cancellation techniques and a new radio link enhancement. The combination of base station and advanced device interference cancellation (full IC), dual receive diversity antennas (Rx Diversity) and radio link enhancements (i.e., efficient power control, early termination and smart blanking) enable this industry leading voice capacity.



  • Superior Voice over IP (VoIP) Capacity: Mobile broadband CDMA2000 technologies, EV-DO Revisions A and B, will support voice over IP (VoIP). VoIP offers operators an increased voice capacity and allows the combination of voice and data to create a seamless multi-media experience, with applications including video telephony and see what I see- types of applications.

    CDMA2000 1xEV-DO Revision A (Rev. A) will be the first 3G mobile technology to commercially support VoIP.

    VoIP is not a Rev. A technical enhancement, per se, but an application that is enabled by advanced Quality of Service (QoS) mechanisms and enhancements to the reverse link. Additionally, Rev. A shortens the time required to complete a cell handover in packet mode to around 50 msec, which is necessary for carrier-grade VoIP calls. Based on simulations, Revision A can support close to 44 simultaneous voice calls in a single 1.25 MHz FDD radio channel. Assuming a 3-carrier in 5 MHz FDD spectrum implementation, Rev. B will be able to handle 132 simultaneous calls, and with full interference cancellation, it will be able to support up to 186 callers, outperforming all other 3G technologies.

Voice over IP (VoIP) Capacity1

1Channel capacities reflect the effects of frequency reuse and overhead structure. Carrier grade VoIP assumes handsets deliver a quality of service comparable to that of existing circuit-switched wireless systems in a mobility environment. EV-DO Rev. A and B capacity using 3 carriers in 5 MHz FDD with no Interference Cancellation (no IC), Pilot Interference Cancellation (PIC) and Full (base station and device) Interference Cancellation (IC) respectively  


  • High-Speed Broadband Data Connectivity: A technology’s ability to support data is measured by its peak data rates and average aggregate data throughput per sector in the uplink and downlink. Peak data rates define the maximum data speeds for the technology measured in kbps or Mbps, while aggregate data throughputs measure total capacity per sector – representing the average bit/sec/sector delivered to/from the collection of users in a single sector.

    Downlink (forward link) data throughput – also referred to as “download speed” – defines the technology’s ability to send data to consumer devices. It is important because support for faster data speeds means that the operator can offer more high-bandwidth services and an improved consumer experience. For example, a wireless technology that can deliver average user download speeds of 1 Mbps is well-positioned to support consumer services such as video on demand and music downloads, as well as enterprise applications.

    Uplink (reverse link) data throughput – also referred to as “upload speed” – measures the speed at which a user can send information from a device to the base station and is similar to forward link data throughput in the sense that support for faster data speeds means that the operator can offer a wider range of data services, such as sharing large files and video streams.

    CDMA2000 technologies continue to evolve to deliver industry-leading data capabilities and allow operators to offer additional bandwidth-intensive applications more affordably.

Peak Data Rates

11X, Rel. 0 and Rev. A in 1.25 MHz, FDD
2 Rev. B with software upgrade in 5 MHz, FDD
3 Rev. B with hardware upgrade in 5 MHz, FDD

Aggregate Data Throughputs


1Downlink: 1X and EV-DO data rates using 3 carriers in 5 MHz FDD. EV-DO assumes 1x2 SIMO. Rev. B includes hardware upgrade.
2Uplink: 1X and EV-DO data rates using 3 carriers in 5 MHz FDD. Rev. A and B include no Interference Cancellation (no IC) and Interference Cancellation (IC); Rev. B also includes hardware upgrade.
  • Low Average Latency: Latency measures the delay in transmitting data in a packet network. The lower the latency, the faster the data is transmitted and the better the quality of delivery. While most 3G networks can easily support e-mail, large data file transfers or applications (including games and music), real-time or delay-sensitive applications such as telephony, voice over IP (VoIP), video conferencing and push-to-talk require low latencies. CDMA2000 technologies have consistently delivered the lowest latencies in the industry. Latency is measured by the average Round Trip Time (RTT) or ping of a packet data transmission between nodes, assuming a minimum network and backhaul delay.

Average Latency1


1The round trip time (RTT) latency of existing systems is based on field measurements of commercial systems using a 32 Byte ping.
2The latency of Rev. B is based on simulation measurements within a laboratory environment and reasonable backhaul and network delays.
  • High Spectral Efficiencies: Spectral efficiency, measured in bits/sec/Hz, refers to the amount of information that can be transmitted within one second across one MHz of spectrum or bandwidth. Spectral efficiency is a measure of how efficiently a radio link utilizes a given amount of spectrum. The higher the spectral efficiency, the more efficient the radio link, and a less amount of scarce spectrum is necessary to transmit the information. The spectral efficiency of any wireless technology depends upon its modulation and coding schemes, control and signaling mechanisms, radio resource management, interference cancellation techniques and antenna configuration.

Spectral Efficiency1

1Spectral efficiencies for existing systems are based on field measurements using 3 carriers in 5 MHz FDD. EV-DO assumes 1x2 SIMO.
2Spectral efficiency of Rev. B is based on simulation measurements within a laboratory environment, including proper implementation margins and RF environment. Rev. B also includes a hardware upgrade.