 3GPP2 CDMA2000 1xEV-DO the spectral efficiency is improved from 0.6 to 0.8 bps/Hz/sector without antenna diversity and equalizer. Reliable and Faster Handoff: Rev. A improves the handoff performance over Rev. 0 which are necessary for non-elastic services like streaming multimedia. Rev. A introduces a new uplink channel called Data Source Channel (DSC) which provides an early indication of handoff to the access network. When the mobile decides to handoff to a new BTS, it signals the network by changing the DSC 64 slots before formalizing the handoff. This advance notice allows the network to queue data at the new BTS while continuing to serve the mobile from the original BTS. When the handoff is triggered, the mobile is not served for 16 slots in a typical configuration. However, as soon as the mobile initiates a connection with the new BTS, there is data waiting to be delivered to the mobile. The outage during handoff of a little more than 16 slots results in an outage of about 27 ms. Since the VoIP implementation within Rev. A terminals can handle 40-60 ms of jitter, this outage is well within the tolerable range of VoIP and other low-latency applications. Multi-Flow RLP (Radio Link Protocol): Multi-flow RLP allows the 1xEV-DO system to send multiple RLP flows to the same subscriber and apply different QoS (Quality of Service) treatments to the flows (e.g., one flow for Internet browsing with no QoS, the second flow for VoIP with high QoS requirements). This feature is called Enhanced Multi- Flow Packet Application (EMPA) that differentiates flows, allowing QoS. A key aspect of EMPA is the integration of Robust Header Compression (RoHC) which allows efficient VoIP transmission. Rev. A integrates ROHC directly into the device and the RAN. End-to-End Quality of Service: Rev. A provides end-to-end QoS by utilizing IS-835D standard and supports both user-based and flow-based QoS. It simultaneously supports both non-elastic (VoIP, Push-to-talk, etc.) and elastic (web browsing, FTP (file transfer protocol), etc.) se