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PrintTechnology talk: Solving the challenges of IP transport migration
When operators plan their migration of mobile backhaul to IP, two key challenges arise time and time again – lack of available site space to install extra equipment, and the difficult technical issue of synchronization over IP technologies.
Many base station sites date back to the initial rollout of 2G networks. The addition of 3G base stations on the same site takes up a lot of the remaining space available in equipment rooms and cabinets. Often there is simply no space left for the addition of IP transport equipment.
But Nokia Siemens Networks Flexi Base Station’s integrated IP transport interfaces solve the issue by eliminating the need for external equipment, reducing the amount of hardware on site. This saves costs, with easier and faster site installation.
So, when the need to migrate to IP transport arises to meet the inevitable demand for traffic that fast mobile broadband will create, all that is needed is a software upgrade to the Flexi BTS.
Flexi BTS also solves the second challenge of synchronization of base stations. In the conventional E1/T1 backhaul world, synchronization via the network has not been an issue. With the move to Ethernet, however, many networks do not yet comply with the Synchronous Ethernet standard. Synchronous Ethernet works only if all hops on the transmission route support it. Therefore, alternative synchronization methods are needed. One practice is to use GPS at the base station site, but the related antennas make this unrealistic in many real-world sites.
The answer lies instead in Flexi BTS Timing over Packet functionality, which is based on the IEEE1588v2 specification and allows synchronization over any packet network.