In 2015, T-Mobile US wanted to modernize its GSM RAN by reparenting 2G base stations from legacy base station controllers (BSCs) to new Evo BSCs. The project needed to be performed fast and there was no room for error. Ericsson provided a new reparenting solution for the massive migration, which enabled greater efficiency and flexibility of the network and satisfied the customer’s needs. It resulted in simpler network management, a smaller carbon footprint and reduced power consumption.
Initially, the plan was for reparenting to be performed during a 10-month period with 42 working weeks. In each working week, 200 base stations were to be reparented, or 40 sites per night.
The reparenting was immensely successful as it was performed in record time – a ten-month time frame compressed to only 12 working weeks. Reparenting was performed each consecutive night, five nights a week without problems. Every day new preparations were made for a new night of reparenting activities which resulted in a project that was executed much more effectively than planned.