Mumbai university >Electronics & Telecommunication > SEM 8 > Wireless Networks

Marks: 10M

• CDMA has single upgrade path for eventual 3G operation. The interim data solution for CDMA is called I-95B. IS-95 channel can support up to 64 user channels. The original IS-95 throughput rate of 9600 bps was improved to current rate 14400 bps.

• The eventual 3G evolution for CDMA system leads to CDMA2000. Several variants of CDMA2000 are currently developed but they based on fundamentals of IS-95 and IS-95B technologies.

• The eventual 3G evolution for GSM, IS-136 and PDC system leads to Wideband CDMA (WCDMA), also called Universal Mobile Telecommunication Service (UMTS). WCDMA is based on the network fundamentals of GSM as well as the merged versions of GSM and IS-136 through EDGE.

• CDMA2000 standard is based on CDMAone system and allows to access internet by using wireless carrier with high data speed. In the year 2002 the first CDMA2000 system was offered and standardized by 3GPP2 (3rd Generation Partnership Project 2). It is especially used in North America and South America and South Korea. It shares its infrastructure with the IS-95 2G standards. To improve the performance of existing system, the CDMA2000 does not use any extra equipment. It just only changed the software or hardware of the existing system.

• The CDMA2000 is more advanced than the CDMAone as it serves the twice number of users than CDMAone and the battery life of mobile station is twice as compared to CDMAone. It also provides high speed data access by using packet data transport. CDMA2000 is seamless and less expensive as compared to W-CDMA. CDMA2000 also known as IMT-CDMA. Multi-carrier is a CDMA version of the IMT-2000 standard developed by the International Telecommunication Union (ITU).

• CDMA2000 is a set of standards that define the new air interface and changed in radio access that will enhance the network capacity, improve data speed and bandwidth of mobile terminals and also allow end-to-end IP services. In early 1990s the application of CDMA technology was introduced in cellular system with development and characterization of IS-95 standard. The CDMA2000 technology is developed from IS-95 with significant enhancement in voice capacity, data speed rate and network features.

• The 3G system implement soft handoff when MS moves from one location to another to overcome the problem of near far terminal.

• CDMA2000 is backward compatible with IS-95 that include enhancement in access and traffic state handoff. The CDMA2000 family reuses the existing IS-95 service standards such as those that define speech services, Short Message Services.

• Data rates of up to 150 kbps or 300 kbps is provided that depend on the configuration of traffic channel radio, enhanced channel coding with turbo encoders at higher data rates are used. It has increased mobile terminal battery life with the introduction of new quick paging channel. All abovefeatures are used in CDMA2000 to provide a voice capacity that is twice that of the CDMAone systems and data rate of 153.6 kbps or 307.2 kbps depending on the radio configuration used.