ts 16 Slots Rev. A: 4 slots SubPkto SubPkto SubPkt0 SubPkt1 SubPkt1 SubPkt1 SubPkt2 SubPkt2 Figure 5.3 Rev. A uplink transmission format. Reproduced from © 2007 Qualcomm [4] Next Generation Mobile Communications Ecosystem RL Sector Capacity Gain 2030Kbps ~128% Increase 890Kbps 539Kbps 316Kbps } 77% EV-DO EV-DO Rev. A + Rev. A + Rel 0 Rev. A 2-Rx BTS Diversity 4-Rx BTS Diversity + SIC* + SIC* Figure 5.4 Rev. A uplink sector capacity gain. Reproduced from C 2007 Qualcomm [4] Network to attempt a decode of the received frame and relay the result back to the mobile terminal. If the frame is successfully decoded before the fourth subframe, the transmission of remaining subframes is discontinued or "early-terminated." These improvements lead to 70% higher throughput and spectral efficiency as compared to Rev. 0. If Successive Interference Cancellation (SIC) and 4-way receive diversity at the BTS are added to the picture, then throughput can reach up to 2.03 Mbps per sector as shown in Figure 5.4. The spectral efficiency is improved from 0.2 to 0.4 bps/Hz/sector without SIC and diversity [4]. Enhanced Forward Link: Though Rev. A was focused on improving the uplink perfor- mance, the standard does provide some key enhancements in the downlink as well. Smaller packet sizes (128, 256, and 512) are introduced to reduce transmission times for small data- rate and time-sensitive applications like VoIP. Multi-user packets have been introduced to take advantage of the small physical layer packets. Packets for different users can be aggregated into a single physical layer packet. By combing smaller packets, the overall effi- ciency of the downlink is improved by sending more payload and less overhead. Figure 5.5 shows the Rev. A downlink sector capacity improvements of about 20% over Rev. 0. And, 20% FL Sector Capacity Gain 1500Kbps 1240Kbps Increase 830Kbps EV-DO Rel. 0 + 2-Rx Rev. A + 2-Rx Rel. 0 Handset Handset Diversity Diversity + Equalizer Figure 5.5 Rev. A downlink sector capacity gain. Reproduced from © 2007 Qualcomm [4]