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1xEV-DO Revision A Interface
In addition to the air interface techniques used in CDMA2000 1X and 1xEV-DO Release 0, the following new high-speed packet-switched uplink techniques are incorporated into CDMA2000 1xEV-DO Revision A:
  • Fast Uplink Rate Control: to efficiently control the transmission of mobile devices
  • Fast Hybrid ARQ in Uplink: to acknowledge correct receipt of data and retransmit erroneous data
  • Incremental Redundancy Feedback in Uplink: to increase the effective data rate in the downlink by terminating the transmission of a packet early if it is decoded earlier than expected
  • Uplink Channelization: to enable better control of the uplink data flows
  • Short Transmission Time Interval (TTI): to accelerate the transmission of packets