The frequency bands used by 3G networks are quite diverse, as different 3G technology standards (e.g., WCDMA, CDMA2000, TD-SCDMA) each have their own frequency band allocation.
WCDMA: Main frequency band: The 2100MHz frequency band is widely used in the deployment of WCDMA networks, with the uplink frequency band at about 1920-1980MHz and the downlink frequency band at about 2110-2170MHz. In addition, the 850MHz, 900MHz and 1700 2100MHz frequency bands are also used in some areas.
CDMA2000: 1XRRTT systems typically use the 800MHz and 1900MHz bands, but other band configurations may be used in some regions. The EVDO (Evolution-Data Optimized) version of the 3G CDMA network may be extended to more frequency bands.
TD-SCDMA: It is a 3G standard independently developed by China, and its main frequency bands are: uplink 1880-1920MHz, downlink 2010-2025MHz.
After introducing the frequency band information above, let's take a look at its use, 3G network is mainly used to provide faster data transmission speeds and a wider range of multi-** services. Mainly include, but are not limited to, the following aspects:
High-speed data service: Compared with the 2G network, 3G can achieve a higher data transmission rate, which can reach 2Mbps indoors and 384Kbps outdoors under ideal conditions, and can ensure a rate of at least 144Kbps even in the mobile state, so as to support users to quickly browse web pages, documents, etc.
Multi-communication: 3G technology makes high-quality audio and calls possible, such as video calls, conferences, etc.
Mobile Internet Access: Provide convenient wireless broadband Internet access services for mobile phone and tablet users, including social apps, games, and streaming.
Mobile Commerce & Information Services: Support a variety of mobile e-commerce activities, such as mobile banking, shopping, and real-time transactions; It can also be used for enterprise-level applications such as telecommuting, conferencing, and mobile CRM systems.
Enhanced location services: Combined with GPS or other location technologies, 3G networks can provide users with more accurate location services and location-based applications, such as navigation and local search.
Multi-standard compatibility: 3G has multiple international standards, including WCDMA, CDMA2000 and China's self-developed TD-SCDMA, all of which can provide different levels of data transmission capabilities and promote the convenience of roaming services on a global scale.
Although the importance of 3G networks has gradually declined with the popularity of 4G and 5G networks, in some regions and scenarios, 3G still exists as a reliable communication infrastructure, providing basic communication and data services to areas that do not have higher-level mobile network coverage.