LTE is a network standard between 3G and 4G; the full name of LTE is "Long Term Evolution", which means "Long Term Evolution". LTE includes "TD-LTE" and "LTE- FDD" two standards, the "LTE-FDD" system air interface uplink and downlink transmission uses a pair of symmetrical frequency bands to receive and send data, while the "TDD-LTE" system uses the same frequency band for uplink and downlink transmission in different time slots. transmission.
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The full English name of LTE is Long Term Evolution, which literally means long-term evolution. LTE represents a network standard, such as GSM, CMDA, etc. that we often talk about. Since it is a network standard, 3GPP will have a definition for LTE. LTE is a network standard between 3G and 4G. It includes TD-LTE and LTE-FDD.
LTE is a standard that was officially established and launched by 3GPP at the Toronto conference in December 2004. 3GPP has a clear positioning of LTE, requiring its peak rate to reach 100Mbit/s in the downlink under a 20MHz spectrum bandwidth. Compared with 50Mbit/s uplink, 3G has improved to a certain extent in terms of signal coverage, mobile performance, data delay, spectrum efficiency, etc.
The two LTE standards, LTE-FDD (Frequency Division Duplex LTE) and TDD-LTE (Time Division Duplex LTE), also have certain technical differences, such as uplink and downlink transmission on the air interface of the LTE-FDD system A pair of symmetrical frequency bands is used to receive and transmit data, while the TDD-LTE system uses the same frequency band for uplink and downlink transmission in different time slots. In addition, compared with FDD duplex mode, TDD has higher spectrum utilization.
LTE provides higher peak data transmission rates, with downlink rates up to 100Mbps and uplink rates up to 30Mbps. LTE is the standard for 4G wireless broadband technology, providing mobile device users with higher network capacity and speed. LTE offers higher peak data transfer rates, with downlink speeds of up to 100Mbps and uplink speeds of up to 30Mbps. It also offers reduced latency, scalable bandwidth capacity and backward compatibility with existing GSM and UMTS technologies. Future developments could produce peak throughputs of approximately 300Mbps.
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The LTE system introduces OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) and MIMO (Multi-Input & Multi-Output, multiple input and multiple output) and other key technologies have significantly increased spectrum efficiency and data transmission rate (20M bandwidth 2X2MIMO in 64QAM, the theoretical maximum downlink transmission rate is 201Mbps, which is about 150Mbps after signaling overhead is removed, but According to the actual networking and terminal capacity limitations, it is generally believed that the peak downlink rate is 100Mbps and the uplink rate is 50Mbps), and supports multiple bandwidth allocations: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz, etc., and supports global mainstream 2G/3G frequency bands and some new frequency bands, so spectrum allocation is more flexible, and system capacity and coverage are also significantly improved.
LTE is a wireless data communication technology standard. The current goal of LTE is to improve the data transmission capacity and data transmission speed of wireless networks with the help of new technologies and modulation methods, such as new digital signal processing (DSP) technology, most of which were proposed around the millennium. The long-term goal of LTE is to simplify and redesign the network architecture to become an IP-based network, which will help reduce potential undesirable factors in the 3G transition.
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