y into single Laptop with EVDO Single High lower data rate flows at Data Card high data rate at the Data Rate the device Figure 5.7 Data flow in an EV-DOEV-DO Rev. B multicarrier system Hybrid Frequency Reuse: Hybrid frequency reuse is defined as the use of different fre- quency re-use for distinct sets of CDMA sectors. By using a different frequency assignment for each sector in a cell, download throughput can be increased since interference is signif- icantly reduced. Diversity and IC: Though diversity is not directly part of the Rev. B specifications, it is almost given that diversity will be present in Rev. B terminals and/or systems. Rev. B devices are expected to have mobile receive diversity (having two receive antennas) that will improve downlink capacity and data rates. Devices can also have equalizer in the chipsets which will increase downlink capacity and data rates. Rev. B systems can have multiple receive chains per sector to improve uplink performance. Interference Cancellation (IC) from Pilot IC to Traffic IC in the base stations will increase the uplink capacity by 10-50% [4]. Upgrade Options: There are two possible options for upgrade from Rev. A to Rev. B as shown in Table 5.1: Software Upgrade only option - Software upgrade will be required for BTS and BSC. New Rev. B capable devices will also be required. Table 5.1 Upgrade options to Rev. B Software Upgrade Hardware and Software Rev. B Features Upgrade Higher peak data rates Support for 64-QAM modulation Higher spectral efficiency (uplink) Higher spectral efficiency (downlink) Multicarrier operation Dynamic carrier allocation Improved battery life (DTX/DRX) Device backward/forward compatibility 3GPP2 CDMA2000 1xEV-DO Software and Hardware Upgrade: In addition to software upgrades at BTS and BSC and new devices; new channel cards will be required in BTS. In both upgrade schemes, neither hardware nor software changes are required in PDSN, Home Agent or other core elements. Improved Battery Life: The battery life is further improved with the int