How long can the base station backup power supply last

state. Yet when a power outage happens, they will be acti-vated to maintain cellular services until the electrical grid recovers or diesel generators are launched. The capacity of a backup battery group is limited, which typically lasts 10 to 12 hours during power outages.

After using BatAlloc to allocate suitable numbers of battery groups for base stations, the average battery lifetime has achieved to 4.3 years, roughly 1.8 times longer than that of the original allocation. The results indicate that our framework can also better protect base station batteries and significantly pro-long their average lifetimes.

In this paper, we closely examine the base station features and backup battery features from a 1.5-year dataset of a major cellular service provider, including 4,206 base stations distributed across 8,400 square kilometers and more than 1.5 billion records on base stations and battery statuses.

for a new battery cell. According to the industry standard, the battery used in cellular communication base station is designed to provide power supply for about 10 to 12 hours and we thus set to 10. The second low voltage disconnect

UPS units are rated by volt-amps and watts, which is a power limit and a rough estimate of how long the battery will last. Many UPS systems are marketed using the volt-amps measurement, but sometimes include the wattage too. A 350-VA unit costs about $50 and should power a router for almost two hours, depending on the router's wattage.

The original battery allocation result is largely skewed that over 65 percent base stations are equipped with only one battery group. Our framework considers both the base station situations and battery fea-tures, allocating 2 battery groups to most base stations and 3 or 4 battery groups to those with long-time power outages.