While sharing of passive infrastructure such as towers is almost de rigeur now, sharing of the active RAN, let alone the core, remains controversial. Increasingly, operators in saturated markets from China to Europe are under increasing pressure to reduce the costs of deploying and operating 4G and 5G networks, so sharing all elements of the network is looking attractive. But not everyone is happy with the trend towards active RAN sharing. Some regulators, such as India’s TRAI, remain concerned that RAN sharing reduces customer choice because operators are less able to differentiate on the basis of their networks. And some MNOs are still wary about sacrificing that full control over the network experience, as well as the timing of introducing…