Recently, ITU (International Telecommunication Union) officially released 5G network sustainable power supply standard ITU-T L.1210, 5G network power supply solutions to define and recommend, applicable to wireless access networks and fixed access networks, focusing on how the power supply side to match the higher availability and reliability requirements of 5G services, The new deployment scenario, as well as the higher environmental requirements, is designed to provide operators with intelligent, reliable, rapid deployment, energy saving and emission reduction ideas, so that 5G rapid deployment and popularization.
Compared to 4G, 5G power consumption will be significantly increased. Taking the 64T64R AAU as an example, the maximum power consumption is expected to be 1000W to 1400W, and the maximum power consumption of BBU is expected to be 1200W to 1500W; The proportion of sites above 5 frequency will rise to 45%, compared with 3% in 2016. As a result, a typical site will consume more than 10kW at a maximum power consumption, while a site with more than 10 bands will consume more than 20kW.
While the 5G network is evolving, the operator site is facing the challenges of new construction and transformation, including: high cost of power generation, transformation, insufficient open capacity and road number of DC power distribution, high-power AAU pull-off scene, excessive cable voltage drop causes the AAU input voltage is insufficient, not working properly, power battery expansion makes the investment double, Traditional lead-acid batteries have low energy density, heavy weight and large volume, heat consumption and power consumption increase synchronously, site cooling capacity expansion cycle is long, large investment, room and cabinet space is insufficient, new cabinets are needed, site operation and maintenance is more complex, electricity costs increase, while rental costs are also increasing.
Several key technical points on 5G power supplies are defined in the itU’s standards released this time to help operators address these challenges:
1) 5G power supply system needs to have multi-energy input and output capabilities, support multi-type AC input and solar access, when solar energy and power grid work at the same time, to ensure the priority use of solar energy. Support s57V DC, 220V AC and other multi-type voltage output, to meet the needs of ICT power convergence, especially edge computing scenes.
2) Lithium batteries will completely replace lead-acid batteries. Compared to lead-acid batteries, lithium batteries have an area of more than 60% less, saving space to meet the needs of business expansion space. Lithium batteries can be used in the site, can also be used in the ICT room, the core requirement is that lithium batteries are parallel with out-of-line without derate.
3) Green and efficient. Power system needs to support dynamic boost, the system can output 57V DC, saving cable loss of 10% to 20%. At the same time, it is recommended that the power supply system support the smooth access of green energy sources such as solar energy.
4) High density. The box power supply has a base power density of approximately 7kW/U (including distribution), a power base capacity of approximately 24KW (450A), and a smooth expansion to 36kW (600A). Cabinet power supply base capacity is not less than 24kW, can be extended to 36kW, the battery capacity in the cabinet is 600Ah.
5) Comprehensive digital, intelligent management. 5G power system needs a smarter camp-dimensional system that supports more efficient management and maintenance, network power availability (PAV), site energy efficiency (SEE), operational efficiency, site security, etc. need to meet higher requirements.
Intelligent collaboration, through big data AI analysis, identify high energy consumption, low SEE sites, analyze the causes, provide accurate upgrades and investment recommendations, improve energy efficiency. Comprehensively secure site productivity and asset security with innovative anti-theft features such as intelligent video, smart door locks, intelligent alarms, clouds and AI.
6) CRAN and DRAN site room, ITU standardalso also emphasizes the importance of intelligent peak cutting characteristics. 5G power supply should be able to work with energy storage systems to cut peaks and valleys when 5G access is made, and 5G deployment sits faster.
The standard was initiated by the ITU-T Study Group 5 working group and, in collaboration with the world’s leading operators and vendors, contributed to its official release.