Search results
Results from the WOW.Com Content Network
In 3G, the most prevalent technology was UMTS with CDMA-2000 in close contention. All radio access technologies have to solve the same problems: to divide the finite RF spectrum among multiple users as efficiently as possible. GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM.
CDMA: CDMA2000, EV-DO: 13 (at peak) September 2013: Acquired by Verizon Wireless and AT&T Mobility. [39] AT&T Wireless Services: GSM: EDGE: 22: October 2004: Acquired by Cingular Wireless, which later rebranded to AT&T Mobility. [40] Big Sky Mobile: GSM: EDGE: Unknown: 2017: Sold spectrum licenses to AT&T and T-Mobile and exited the business ...
The Universal Mobile Telecommunications System (UMTS) is a 3G mobile cellular system for networks based on the GSM standard. Developed and maintained by the 3GPP (3rd Generation Partnership Project), UMTS is a component of the International Telecommunication Union IMT-2000 standard set and compares with the CDMA2000 standard set for networks based on the competing cdmaOne technology.
Technologies like AMPS, TDMA, iDEN and CDMA 1x/EV-DO were used in the past by some of those networks and have been phased out in favor of newer systems. On 20 April 2022, Oi ’s mobile network operations were sold to the country's three largest carriers, Vivo , Claro and TIM . [ 36 ]
Exclusive use for M2M, emergency communication and Smart Metering. Alliander Netherlands: CDMA2000 1xRTT, EV-DO Rev. A 450 May 2016: 3 MHz [5] [6] Private network for critical infrastructure. Exclusive use for M2M communication and Smart Metering. 450connect Germany: CDMA2000 1xRTT, EV-DO Rev. A 450 Nov 2016: 2x 1,25 MHz [7] [8] [9] [10]
GSM-900 MHz (GPRS, EDGE) 2100 MHz UMTS, HSPA+: 5.4 [2] (Q4 2020) Aga Khan Fund for Economic Development (AKFED) 3: Etisalat Afghanistan: GSM-900/1800 MHz (GPRS, EDGE) 2100 MHz UMTS (3G), HSPA+ (3.75G), LTE (Under Trial) 5.4 [1] (Q4 2020) Emirates Telecommunications Corporation: 4: Afghan Wireless: GSM-900/1800 MHz (GPRS, EDGE) 2100 MHz UMTS ...
Apart from their main spectrum holdings across large regions in the country (listed below) the major US carriers (AT&T, Sprint, T-Mobile & Verizon) also hold various Cellular Market Area (CMA) and/or Economic Area (EA) licenses for the AWS 1700 band, as well as Major Trading Area (MTA) and/or Basic Trading Area (BTA) licenses for the PCS 1900 band.
up to 25 adjacent 0,2 MHz GSM carriers or one 4,2 MHz W-CDMA carrier flanked with 2x2 0,2 MHz GSM carriers Georgia: MagtiCom: May 2018: 15 MHz, UMTS: 20 MHz, 10 MHz Feb 2015: N/A - 13,2 MHz, GSM: 5 MHz Jun 2016 - - - - 20 MHz (Cat.4) (Feb 2015) 25 MHz (CA_3A_20A) (Cat.6) (Jun 2016) 30 MHz (CA_3C) [4x4 MIMO] (Cat.9) (Sep 2018) [4] [5] [114] [115 ...