Fast and error-free reparenting

T-Mobile US and Ericsson completed a massive migration in record time with a 100 percent success rate.
Fast and error-free

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.



Project finished much earlier than planned: 12 weeks vs. the expected 42
No issues or unplanned network disturbances
Great operator satisfaction



Reparenting 7,000 GSM sites to new BSCs

Expected timeframe: 42 working weeks

Complexity: changes required on WCDMA and LTE sites due to CGI (LAC) change on GSM cells



Automated reparenting process implemented. Ericsson performed all reparenting services 

Customer Profile

As the US’s Un-carrier, T-Mobile US, Inc. (NASDAQ: TMUS) is redefining the way consumers and businesses buy wireless services through leading product and service innovation. The company’s advanced nationwide 4G LTE network delivers outstanding wireless experiences to approximately 63 million customers who are unwilling to compromise on quality and value. Based in Bellevue, Washington, T-Mobile US provides services through its subsidiaries and operates its flagship brands, T-Mobile and MetroPCS.