3G Vs 4G
|Frequency Band||1.8 - 2.5 GHz||2 - 8 GHz|
|Bandwidth||5-20 MHz||5-20 MHz|
|Data rate||Up to 2Mbps ( 384 kbps WAN)||Up to 20 Mbps or more|
|Access||Wideband CDMA||Multi-carrier - CDMA or OFDM(TDMA)|
Regarding this, what is the frequency of GSM?
Today, most telephones support multiple bands as used in different countries to facilitate roaming. These are typically referred to as multi-band phones. Dual-band phones can cover GSM networks in pairs such as 900 and 1800 MHz frequencies (Europe, Asia, Australia and Brazil) or 850 and 1900 (North America and Brazil).
What is uplink and downlink in mobile communication?
The communication going from a satellite to ground is called downlink, and when it is going from ground to a satellite it is called uplink. When an uplink is being received by the spacecraft at the same time a downlink is being received by Earth, the communication is called two-way.
Which countries use GSM?
most popular standard for mobile phones in the world. GSM 900 / GSM 1800 MHz are used in most parts of the world: Europe, Asia, Australia, Middle East, Africa. GSM 850 / GSM 1900 MHz are used in the United States, Canada, Mexico and most countries of S. America.