what is defference beetween 3g and 4g

what is defference beetween 3g and 4g

		Comparison chart                                                 3G                                                                4G                                                                                                                     Data Throughput       Up to 3.1Mbps with an average         Practically speaking, 2 to 12 Mbps (Telstra in Australia claims up to 40 Mbps)                            speed range between 0.5 to 1.5 Mbps                            but potential estimated at a range of 100 to 300 Mbps. Peak Upload Rate        5 Mbps                                                                             500 Mbps Switching Technique         packet switching                                                          packet switching, message switching Network Architecture         Wide Area Cell Based                                                          Integration of wireless LAN and Wide area. Services And Applications     CDMA 2000, UMTS, EDGE etc                                         Wimax2 and LTE-Advance Forward error correction (FEC)       3G uses Turbo codes for error correction.                          Concatenated codes are used for error corrections in 4G. Peak Download Rate               100 Mbps                                                                    1 Gbps Frequency Band                        1.8 – 2.5 GHz                                                               2 – 8 GHz
		4G Speed vs. 3G How much faster is 4G compared to 3G? Unfortunately for consumers, the answer to this question is more nuanced than one would like. The speed of a 3G network depends upon how it is implemented. In the US, by 2010 Sprint and Verizon (both CDMA networks) had reached the limits of how fast they could make their 3G networks. Upgrading to 4G networks allowed them to offer data transmission speeds up to four times faster than their 3G networks. However, the 3G networks of GSM carriers AT&T and T-Mobile were designed such that there was room to upgrade 3G speeds. As of mid-2010, it is anticipated that when AT&T and T-Mobile upgrade their 3G networks, their speeds will become comparable to 4G from Sprint and Verizon.