There were several 2G cellular systems, but the most important ones--as they were the starting points of two families of digital technologies, as shown in Figure 1--were the Global System for Mobile Communications (GSM) and IS-95, also known as cdmaOne
. Both are fully digital and support voice and circuit-switched (CS) data at low rates (up to 14.4 Kbps) (1Kbps = 1024 bits per second).
Ak Emarievbe, product marketing manager at Rohde & Schwarz, said his company's general-purpose R&S FSW signal and spectrum analyzer, for example, supports WCDMA/HSPA/HSPA+, 3GPP LTE, GSM/EGPRS/EDGE Evolution/ VAMOS, CDMA2000 1xEV-DO, CDMA2000 1xRTT, TD-SCDMA, GSMR, TETRA, cdmaOne
, DECT, WLAN IEEE 802.11a/b/g/j/p/n/ac, ZigBee IEEE 802.15.4, RFID, WRAN IEEE 802.22, WWAN IEEE 802.20, DVB-H, ISDB-T 1 Seg, CMMB, DVB-T, DVB-T2, ISDB-T, AM, FM, DVB-S, and DVB-S2.
These include global system for mobile communications (GSM), general packet radio service (GPRS), cdmaOne
, CDMA2000, evolution-data optimized (EV-DO), enhanced data rates for GSM evolution (EDGE), universal mobile telecommunications system (UMTS), digital enhanced cordless telecommunications (DECT), digital AMPS (IS-136/TDMA), and integrated digital enhanced network (iDEN).
2 that the number of 2G cdmaOne
and 3G CDMA2000 subscribers has expanded its market share in Latin America and the Caribbean to 70.4 million users, or 26% of the technology market share in the region.
More than 125 manufacturers have license agreements with QUALCOMM Technology Licensing (QTL) covering cdmaOne
and CDMA2000 applications, and more than 50 manufacturers have licenses covering WCDMA and TD-SCDMA standards."); Press Release, Qualcomm, Inc., United States Patent Office Reaffirms the Validity of Important QUALCOMM CDMA Patent (March 23, 1999)), available at http://www.qualcomm.com/press/releases/1999/press458.html ("[N]o single patent is critical to QUALCOMM's coverage of second or third generation CDMA wireless standards because QUALCOMM holds dozens of patents that are essential to the leading standards....").
Furthermore, the application of the company's WinIQSIM simulation software facilitates the generation of signals for additional standards (cdmaOne
, 3GPP TDD or TDSCDMA, for example).
(IS-95) was publicly used for the first time in 1995 and it gained popularity only when its new version CDMA 2000 1X was developed in October, 2000.
"The evolution of a cdmaOne
network to CDMA lx is relatively simple since very few new elements are required," said Jodoin.
As the new service is compatible with the existing ''cdmaOne
'' network, users of the new car navigation system will be able to access information in any part of the country, the two companies said.
KDDI offers two different standards, PDC and cdmaOne
, developed in the United States.
According to KDDI, its planned new service, called cdma2000 1X, can transmit data at a speed of up to 144 kilobits per second, compared with 64 kilobits for the current cdmaOne
With the deal, signed in Beijing on Tuesday evening, China Unicom plans to introduce in China possibly by the end of this year mobile phone services based on KDDI's ''cdmaOne
'' mobile format, which allows for high-quality voice and data transmission.