Scope
L.1350 describes specific principles of energy efficiency metrics for fully integrated base station sites. It shouldn’t be used to evaluate or measure the energy/power efficiency of individual site elements/equipment that are covered by other recommendations like L.1310 (radio base stations) and L.1320 (power and cooling equipment).
Summary
L.1350 defines the site energy efficiency (SEE) metric to create a benchmark for comparing base station sites and determine opportunities to increase EE or reduce the power consumption of specific sites (see ITU-T L.1351 for the definition of parameters).
A base station site (urban or rural; GSM, UMTS, etc.) in L.1350 typically includes telecommunication equipment, including backhaul, and site facility equipment like rectifiers, power backup, air conditioning, batteries, safety and monitoring equipment, etc. The equipment can exist as separate items or can be integrated into one or more physical units.
With this definition of a base station site, SEE is the ratio between ECT, the total energy consumption of telecommunication equipment in the base station during measurement, and ETS, the total energy consumption on site (formula comparable to PUE for data centres):
In this case, ECT is the mathematical product of volts, amperes and the measurement timeframe (power delivery provides direct current) with a measurement point at the power feeding interface. ETS is the sum of different input energy sources in the form of electricity needed for operation. The input electrical energy can be provided by a utility organisation/public grid – EGE (kWh) – with measurement as metering information by utility suppliers. It can also be locally generated, either by generators (e.g. diesel) or from renewable resources (solar, wind, etc.) – EFE (kWh, in L.1351 divided into EFE and ERE) – with measurement by meters or sensors on site.
International standards regarding the measurement’s observation period, including data collection, should be applied. If not available, L.1350 recommends real-time monitoring or at least a frequency of measurement as low as possible with a repeatable, defined process. That way, statistical analysis, historical trends and comparisons based on more accurate data are possible. Also, unexpected variations indicate that system issues can be detected more easily. A standardised reporting – average SEE measured over a one-year period – should be established.
Relevance for EXIGENCE
Relevant for requirements and scenarios, energy metrics, energy measurements and data collection.
