Chapter Ten. Data in cdma2000 Packet Networks
| A packet switched network has been developed for cdma2000 radio access technology, which utilizes protocols developed by the IETF (Internet Engineering Task Force) to provide packet data services. The network functionalities of the packet network are specified in TIA/EIA/IS-835 and 3GPP2 P.50001-A. [1] The radio functionalities are specified in TIA/EIA/IS.2000. The packet network supports only IP data. In comparison, the GPRS (general packet radio services) network is designed to provide access not only to IP but also other packet data networks (e.g., X.25). Another design approach that is different from GPRS is that the cdma2000 IP network uses the existing circuit switched (CS) radio network (RN composed of BSS, MSC/VLR, and HLR) for mobility functions, such as paging and hard handover. This implies that the packet network for cdma2000 cannot be deployed as a standalone packet network like GPRS. On the other hand, the packet network for cdma2000 is built on already available and well- understood IP protocols.
The network is based on IP version 4. IP version 6 is being incorporated as a future enhancement. The network also supports high-speed circuit switched data (HSCSD) service, but in this chapter the focus is on the IP services. The HSCSD service is similar to the HSCSD offered by IS-95 and is described in Chapter 6. The cdma2000 air interface development effort was initially planned into two phases. Phase 1 was called 1xRTT; it employs 1.25 MHz of bandwidth and can deliver a peak date rate of 1.03 Mbps. Phase 2 was called 3xRTT; it was supposed to use 5 MHz and was promised to deliver up to 2 Mbps. Only 1xRTT is deployed by cellular operators, and 3xRTT was not deployed. The focus of the industry is on the evolution of 1xRTT for higher data throughput by using technologies such as 1X-EV-DO (1x evolution for data only) and 1X-EV-DV (1x evolution for data and voice).  |
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