The national two sessions will be held soon. Zhang Yunyong, member of the National Committee of the Chinese people’s Political Consultative Conference and general manager of China Unicom’s product center, learned that he will submit a proposal on 5g high-speed rail this year. He proposes to take Beijing as the center, implement 5g high-speed rail “boarding” scheme around Beijing Zhangjiakou, Jingxiong, Airport and other high-speed rail business card lines, and further copy and promote to Beijing Shanghai, Beijing Guangzhou and other important high-speed rail operation lines.
Aiming at the problems of high energy consumption and huge operation cost of 5g equipment, he proposed to give full play to the advantages of 700MHz “golden band” in signal coverage and delay, and coordinate four 5g communication operators to jointly carry out the co construction and sharing of 700MHz low-frequency 5g network.
According to him, a working group has been set up in China for 5g coverage along the high-speed railway. The working group proposed the scheme of “getting on the train” of 5g high-speed railway through micro repeater equipment. It is estimated that the network construction cost will be reduced by 50%, and the investment will be saved by more than 10 billion yuan.
In addition, with regard to 5g coverage in vast rural areas, Zhang Yunyong proposed in another proposal to build a nationwide low-frequency 5g shared access network using 700MHz frequency band, which will be shared by four operators to avoid repeated construction. And as soon as possible to carry out 5g low-frequency resources reserve layout.
According to its calculation, the number of base stations required for 700MHz in the wide coverage scenario in rural areas is 1 / 5 of 2.6GHz, 1 / 6 of 3.5GHz and 1 / 9 of 4.9ghz. If we build a 5g network with the same coverage level as the existing 4G network, 700MHz can reduce the construction investment by about 190 billion yuan compared with 3.5GHz, and save about 20 billion yuan in electricity, rent and other operating costs every year.
Speed up the “5g High Speed Rail” and implement the business card project
Zhang Yunyong pointed out in the proposal that 5g technology is the innovation engine for the upgrading and evolution of information technology and the strategic basis for new infrastructure to lead new development. At present, 710000 5g base stations have been built and put into operation in China, and the number of connected users has exceeded 160 million.
However, the current 5g application promotion is still facing the problem of insufficient livelihood demonstration, and high-speed rail transportation is a typical case in this regard. In recent years, with the planning and construction of China’s “eight vertical and eight horizontal” high-speed rail network, the advantages of high-speed rail fast and convenient has become the first choice of people’s medium and long-distance travel. By the end of July 2020, the total operating mileage of China’s high-speed railway has reached 36000 km. However, the 5g network is still lack of comprehensive coverage support for the operation ecology of high-speed railway
One is technology: 5g has high frequency and high attenuation, while high-speed railway has fast speed and strong shielding. Therefore, the practice of 5g coverage following 4G mode along high-speed railway will be difficult to continue, and the corresponding technical scheme needs to be further studied.
Second, in terms of resources: it mainly involves the utilization of wireless resources for high-speed railway scenarios. How to open the frequency band and site resources to the four communication operators to ensure industry collaboration needs to be further studied.
The third is the application: around the industry application of 5g + high-speed rail layout, the strength of demonstration needs to be strengthened.
Fourth, operation: the energy consumption of 5g equipment is three times that of 4G, which leads to the problem of huge operation cost. This problem is not only limited to the high-speed railway scenario, but also runs through the operation of the whole 5g network.
In order to continuously promote the innovation and integration of 5g new infrastructure and traditional railway infrastructure, focusing on the above problems, Zhang Yunyong puts forward the following suggestions:
（1） Collaborative promotion to accelerate technology validation. At present, under the collaborative promotion of the Ministry of industry and information technology and China Railway Group, a working group has been set up for 5g coverage along the high-speed railway. The working group has proposed a scheme to realize 5g high-speed railway “boarding” through micro repeater equipment (it is estimated that the network construction cost can be reduced by 50%, and the investment can be saved by more than 10 billion yuan), but the relevant technical scheme has not been verified.
He suggested that we should continue to improve the communication and coordination mechanism among various units, continuously optimize the iterative technical scheme under the leadership of the working group, accelerate the “on board” verification of relevant schemes and equipment, and test the 5g network performance in the car on the premise of the completion of equipment development and laboratory commissioning, so as to ensure the reliability of network quality and realize the goal and vision of providing high-quality service.
（2） Reasonable planning and sharing of core resources. Zhang Yunyong suggested to give full play to the advantages of 700MHz “digital gold” band in signal coverage and frequency division duplex delay, coordinate four 5g communication operators to jointly carry out the co construction and sharing of 700MHz low-frequency 5g network, and promote the agile application of relevant co construction and sharing schemes in high-speed railway scenarios.
At the same time, he proposed to further clarify that 5g spectrum resources (including industrial Internet 5g spectrum resources) are exclusive to four communication operators with 5g licenses, and no longer issue 5g spectrum resources to special industries and large enterprises. Communication operators should provide professional services for enterprises with 5g demand, so as to ensure the standardization of 5g network application and operation.
（3） Agile application, landing business card project. At present, CCTV is planning to launch 5g + 4K ultra high definition Winter Olympic Games sports live program in Beijing Zhangjiakou high speed railway, and report the demonstration demand and “boarding” scheme to the Winter Olympic Organizing Committee in October 2020, which has played a positive role in integrating 5g into high speed railway lines. He suggested that on the basis of this model, further focus on the high-speed railway scene, create 5g application ecology connecting media, education, sports and entertainment, explore the construction path relying on new demand, new mode, new technology and new scheme, make the key projects and business card projects come to the ground as soon as possible, and pursue the multiplier effect of “one industry brings hundreds of industries” brought by 5g new infrastructure.
Specifically, we can consider taking Beijing as the center, implementing the 5g high-speed rail “boarding” scheme around Beijing Zhangjiakou, Jingxiong, airport and other high-speed rail business card lines, and taking the entertainment travel project as a pilot project to improve the quality of travel service. If the pilot scheme is completed and approved, it can be further replicated and promoted to Beijing Shanghai, Beijing Guangzhou and other important high-speed rail lines.
（4） Comprehensive policy to reduce operating costs. Zhang Yunyong suggested that 5g network services along the high-speed railway should be taken as a pilot to verify the feasibility of 5g network operation preferential policies.
For example, promote the sharing of tower, building, pipeline and other facilities along the railway with 5g base stations, and enjoy preferential rent policies; give preferential policy support to the power consumption of on-board and equipment along the 5g network service of high-speed railway.
Share the “golden spectrum” and reduce the cost of 5g coverage in rural areas
Zhang Yunyong pointed out in a proposal on developing digital rural infrastructure and building and sharing 5g low frequency access network that China has achieved full coverage of 5g network in cities above prefecture level so far.
In addition to cities, basic telecom operators need to deploy more base stations to cover counties and villages to promote 5g high-quality development. However, due to the low population density of rural environment, the same hot spot density deployment coverage as urban 5g coverage can not be adopted in the short term, and it is still a 5g blind area at present.
At the same time, 5g will integrate artificial intelligence and other technologies to promote the rapid development of agricultural modernization and liberate more rural labor force. For example, intelligent agriculture can use robots and UAVs for pesticide spraying and farming operations. Through 5g network, farmers can check crop growth on their mobile phones and remote control.
He believes that the current distribution of communication spectrum resources limits the large-scale deployment of 5g in rural areas. Communication services need spectrum resources as the basis, such as buildings on the ground to land. Low frequency resources (sub1g, less than 1GHz) are of great strategic significance for 5g new infrastructure, but China’s mobile communication low frequency resources are scarce and poorly balanced.
As the golden band of mobile communication, the breadth and depth of 700MHz spectrum resources and the delay advantage brought by FDD can greatly reduce the cost of network deployment and construction difficulty, and better meet the 5g key scenarios with high delay, coverage and security requirements.
To achieve the same coverage effect in typical rural areas, the number of base stations required for 700MHz is 1 / 5 of 2.6GHz, 1 / 6 of 3.5GHz and 1 / 9 of 4.9ghz. If we build a 5g network with the same coverage level as the existing 4G network, 700MHz can reduce the construction investment of wireless equipment, optical cable and transmission system by about 190 billion yuan compared with 3.5GHz, and save about 20 billion yuan in electricity and rental costs every year. 700MHz has an irreplaceable advantage in building and improving 5g universal coverage in rural and remote areas, and is of great significance to poverty alleviation and eliminating the digital divide.
Internationally, the United States, Britain, France, Germany, Japan, South Korea, Singapore, Russia and other countries, in order to ensure the coverage of rural areas and other non hot areas, adopt the balanced average auction allocation method for the low-frequency spectrum including 700MHz, that is, to ensure that the mobile communication of this frequency band covers all citizens and operators without difference, and to ensure the balance of basic operators in basic communication resources to provide universal access Affordable communication services.
At present, most of China’s 700MHz low-frequency resources have been allocated to China Radio and television, and China Radio and television and China Mobile have announced the joint construction and sharing of 700MHz. Zhang Yunyong believes that although this can improve its own communication service capacity, compared with the international common practice, the unbalanced distribution will lead to a huge gap in the 5g inclusive service capacity of operators in rural areas, aggravate the imbalance of the industry, and unfairly affect the users covered by the other two operators, especially the rural users in remote areas.
In view of the above problems, he suggested that the digital rural mobile communication infrastructure and 700MHz spectrum resources should be positioned as the basic public resources covering all mobile communication users including rural population.
He pointed out that 700MHz band is the only low-frequency band that can be used for 5g deployment in China at present. It is suggested that the frequency band should be used to build a nationwide low-frequency 5g shared access network for the above-mentioned users through joint participation of all parties, and shared by four basic operators, so as to avoid repeated construction and maintain a relatively balanced development of the industry. Promote fair competition and sustainable development, benefit all rural users, ensure consistent user experience and data security, ensure sharing when opening, and determine reasonable settlement mechanism and price through negotiation. Jointly promote all China Netcom 5g700mhz terminal for nationwide low-frequency 5g shared access network and 5g terminal module and application for digital rural development.
In addition, he suggested exploring the feasibility of researching and developing lower frequency communication for digital village 5g development, balancing the spectrum demand of mobile communication and other industries, and providing spectrum resource guarantee for inclusive 5g communication services.
From the perspective of global spectrum allocation trend, the United States, Europe and other countries and regions regard low frequency band as the public core resource of national 5g strategy, and have started to release low frequency resources such as 600MHz. It is suggested that the reserve layout of 5g low frequency resources should be carried out as soon as possible, and the planning scheme of maximizing the value of spectrum resources should be evaluated from the two dimensions of economic efficiency and spectrum efficiency. Promote the supply of 5g low frequency network and terminal equipment as soon as possible.
Editor in charge: Tzh