Why are there 6 types of LTE bandwidths and which are the bandwidths supported by LTE?

The LTE 6 bandwidth is to adapt to the spectrum of different bandwidths. In many countries, spectrum is fragmented and spectrum resources are very expensive. Operators decide the bandwidth of LTE based on their own spectrum resources.

LTE is a long-term evolution of the UMTS technical standard developed by the 3GPP organization, which was officially established and launched at the 3GPP Toronto meeting in December 2004. The LTE system introduces key technologies such as OFDM and MIMO, which significantly increase the spectral efficiency and data transmission rate.

And supports multiple bandwidth allocations:

3MHz, 5MHz, 10MHz, 15MHz and 20MHz, and supports the world's mainstream 2G 3G frequency bands and some new frequency bands, so the spectrum allocation is more flexible, and the system capacity and coverage are also significantly improved. The LTE system network architecture is flatter and simpler, and the number of network nodes is reduced.

and system complexity, thereby reducing system latency and network deployment and maintenance costs. The LTE system supports interoperability with other 3GPP systems. LTE systems are divided into FDD-LTE and TDD-LTE according to duplex mode, and the main difference between the two technologies is the physical layer of the air interface.

(like frame structure, time and division design, synchronization, etc.). The uplink and downlink of the air interface of the FDD system uses pairs of frequency bands to receive and transmit data, while the uplink and downlink of the TDD system uses the same frequency band to transmit data in different time slots, which has a higher spectrum utilization rate than the FDD duplex mode.

In order to accommodate spectrum of different bandwidths. In many countries, spectrum is fragmented and spectrum resources are very expensive. Operators decide the bandwidth of LTE based on their own spectrum resources.

The 3GPP agreement stipulates that it is the result of discussions among the parties involved in the development of the agreement.

The LTE system supports 6 different transmission bandwidths, namely MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz.

The LTE 6 bandwidth is to adapt to the spectrum of different bandwidths. In many countries, spectrum is fragmented and spectrum resources are very expensive. Operators decide the bandwidth of LTE based on their own spectrum resources.

LTE is a long-term evolution of the UMTS technical standard developed by the 3GPP organization, which was officially established and launched at the 3GPP Toronto meeting in December 2004.

A frequency band (frequency band) is a segment of a frequency that has a range. A frequency point is a frequency point on a frequency band.

For example, Band 40 in LTE is from 2300 MHz to 2400 MHz; A total of 100 Mbit/s of bandwidth is occupied.

For LTE, 100kHz is a Raster. That is, to.

100k (as the smallest unit of the frequency band.)

In this way, band40 occupies 100M bandwidth, so to distinguish, then there are 100 frequency points.

Wireless channel. It is a wireless communication.

A figurative metaphor for the path between the transmitter and receiver, for radio waves.

It travels from the sender to the receiver without a physical connection.

In order to vividly describe the work between the sender and the receiver, we can imagine that there is an invisible road connection between the two, and this connection path is called a channel.

The channel bandwidth is the lower and upper frequency of the signal that is allowed to pass through the channel, which can be understood as a frequency passband. For example, if the allowable passband of a channel is up to 15kHz, then its bandwidth is.

The LTE network architecture is E-UTRAN to remove RNC network nodesIn order to simplify the network architecture and reduce latency, the RNC function is distributed to the Evolved Node B (Enode B) and Service Gateway (S-GW).

The LTE access network is called Evovled UTLAN (E-UTRAN), which adopts a flatter network structure than the traditional UTLAN architecture.

Specifics:

The E-UTRAN structure contains several Enode Bs, and the underlying Enodes Bs are connected to each other through X2 interfaces, that is, the mesh network structure, which is mainly used to support the mobility of UE in the entire network and ensure seamless switching of users.

Each ENODE B is connected to the Mobility Management Entity (MME) of the Evolved Packet Core (EPC) network through the S1 interface, that is, it is connected to the MME through the S1-MME interface, and connected to the Mme through the S1-U and S-GW, and the S1-MME and S1-U can be regarded as the control plane and user plane of the S1 interface, respectively.