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Who Disaggregated My RAN eBook

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radisys.com 18 Radisys Series — Who Disaggregated My RAN? eBook The O-RAN Alliance has specified two new layers for the mobile network architecture with its RAN Intelligent Controller (RIC): • Near Real-time RAN Intelligent Controller • Non Real-time RAN Intelligent Controller The Near Real-time RIC If we look at the latency numbers in the figure above, the Near Real-time RIC acts within 10 to 1000 milliseconds to make decisions based on metrics from RAN nodes. These decisions are driven by sophisticated algorithms built in to the "xApps." But, why is there the need for these algorithms or XApps? An average user of a mobile network expects quality of service and constant connectivity – even when moving through zones with limited coverage. As the device begins to lose signal strength from one base station, the connection is handed off to another base station to allow the user to enjoy seamless connectivity, even while traveling at high speeds in a car. However, on 4G networks, this isn't the experience that users always get. For 5G networks we are trying to achieve that seamless connectivity experience by making the RAN smarter, not only in the connection management, but also in the quality of service, the data rates, and priority of service. There can be Figure 1: O-RAN RIC: Intelligence and Control in Action

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