What kind of mobility is required for 5g?

The mobility requirement of the 5G system reaches "500km/h". 5G is a new generation of broadband mobile communication technology with the characteristics of high speed, low latency and large connections. The specific indicators of 5G are: 1. The device density reaches 6 million/km2; 2. The traffic density is above 20Tbs/km2; 3. The mobility reaches 500km/h, achieving a good user experience in the high-speed rail operating environment; 4. The user experience rate is on the order of Gbps, and the transmission rate is increased by 10 to 100 times based on 4G.

The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

The 5th Generation Mobile Communication Technology (5G for short) is a new generation of broadband mobile communication technology with the characteristics of high speed, low latency and large connections. 5G communication facilities are the key to realizing the realization of human, machine and physical objects. Internet network infrastructure.

The International Telecommunications Union (ITU) has defined three major application scenarios for 5G, namely enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (uRLLC) and massive machine type communications (mMTC). Enhanced mobile broadband (eMBB) is mainly aimed at the explosive growth of mobile Internet traffic and provides mobile Internet users with a more extreme application experience; ultra-high reliability and low latency communication (uRLLC) is mainly aimed at industrial control, telemedicine, autonomous driving, etc. and vertical industry application needs with extremely high requirements on reliability; Massive Machine Type Communications (mMTC) is mainly oriented to application needs targeting sensing and data collection such as smart cities, smart homes, and environmental monitoring.

The specific situation of 5G indicators is as follows:

• The equipment density reaches 6 million/km2;

• Traffic density is above 20Tbs/km2;

• Mobility reaches 500km/h, achieving a good user experience in the high-speed rail operating environment;

• The user experience rate is on the order of Gbps, and the transmission rate is increased by 10 to 100 times based on 4G;

• The end-to-end delay is reduced to 1/10 or 1/5 of 4G. Reaching the millisecond level.

Performance indicators

1. The peak rate needs to reach 10-20Gbit/s to meet the transmission of large amounts of data such as high-definition video and virtual reality .

2. The air interface delay is as low as 1ms, meeting real-time applications such as autonomous driving and telemedicine.

3. It has the device connection capability of one million connections/square kilometers to meet the requirements of IoT communication.

4. Spectrum efficiency is more than 3 times higher than LTE.

5. Under continuous wide area coverage and high mobility, the user experience rate reaches 100Mbit/s.

6. Traffic density reaches more than 10Mbps/m2.

7. Mobility supports high-speed movement of 500km/h.

Key Technologies

• ##5G Wireless Key Technologies
  5G international technical standards focus on meeting the needs of flexible and diverse Internet of Things. Based on the basic technologies of OFDMA and MIMO, 5G adopts a flexible new system design to support three major application scenarios. In terms of frequency bands, unlike 4G that supports mid- and low-frequency, 5G supports both mid-low and high-frequency bands, considering that mid- and low-frequency resources are limited. The mid-low frequency meets the coverage and capacity requirements, and the high frequency meets the need to increase capacity in hot spots. 5G is targeted at A unified technical solution is designed for mid-low frequency and high frequency, and supports a basic bandwidth of 100 MHz. In order to support high-speed transmission and better coverage, 5G uses LDPC, Polar's new channel coding scheme, and large-scale antenna technology with stronger performance. In order to support low latency and high reliability, 5G uses technologies such as short frames, fast feedback, and multi-layer/multi-station data retransmission.

• 5G network key technologies
  5G adopts a new service-oriented architecture to support flexible deployment and differentiated business scenarios. 5G adopts a full-service design, modular network functions, and supports on-demand invocation to realize function reconstruction. It adopts service-oriented description to easily realize the opening of capabilities, which is conducive to introducing IT development strength and unleashing the potential of the network. 5G supports flexible deployment. Based on NFV/SDN, it realizes the decoupling of hardware and software and the separation of control and forwarding. It adopts the cloud networking of general data center, with flexible network function deployment and efficient resource scheduling. It supports edge computing and cloud computing platform. Sink to the edge of the network to support flexible selection of application-based gateways and edge offloading. Meet the differentiated needs of 5G through network slicing. Network slicing refers to selecting specific features and functions from a network and customizing a logically independent network. It allows operators to deploy multiple networks with different functions and feature services. Logical networks serve their respective target users. Currently, three types of network slicing are defined, namely enhanced mobile broadband, low latency and high reliability, and large-connection Internet of Things.

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