5G Radio Access System Design Aspects
Nokia Networks white paper
5G will be an ultra-fast and ultra-flexible communication network including different technologies, but will be transparent for the end user and easy to manage for the operator. Additionally, 5G needs to address the predicted large increase in data traffic and will have to fulfil the capacity, data rate and latency requirements of next- generation devices.
To enable the capacity and data rate requirements for 5G, new spectrum bands are required, along with the massive densification of small cells. Ultra dense small cells will be a key element of 5G deployment and these small cells need to be deployed over a wide frequency range. Hence the design needs to be flexible enough so that the system could be deployed in bands ranging from 2 GHz to 100 GHz. Both the cmWave and mmWave layers will support a set of common features like dynamic TDD, massive MIMO/beamforming, device-to-device communications, and a frame structure with low overhead and shorter frame size. Where the layers differ is on the use of moderate or high bandwidth, implementation of MIMO/ Beamforming schemes and interference co-ordination and mitigation schemes.
Moreover, flexibility is required to support a wide range of services and requirements. The network needs to support, for example, ultra- high reliability for critical communications, for example in vehicle-to- vehicle communications, but also very loose reliability requirements for low cost Internet of Things applications, such as reports from humidity sensors. High data rate machine-to-machine applications.
© Nokia 2015
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