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5G NR Deployment Modes

2025-01-09

Initial 5G NR launches will depend on existing 4G LTE infrastructure in non-standalone (NSA) mode, before maturation of the standalone (SA) mode with the 5G core network. Additionally, the spectrum can be dynamically shared between 4G LTE and 5G NR.

Non-standalone mode

The non-standalone (NSA) mode of 5G NR refers to an option of 5G NR deployment that depends on the control plane of an existing 4G LTE network for control functions, while 5G NR is exclusively focused on the user plane. This is reported to speed up 5G adoption, however some operators and vendors have criticized prioritizing the introduction of 5G NR NSA on the grounds that it could hinder the implementation of the standalone mode of the network.

Dynamic spectrum sharing

To make better use of existing assets, carriers may opt to dynamically share it between 4G LTE and 5G NR. The spectrum is multiplexed over time between both generations of mobile networks, while still using the 4G LTE network for control functions, depending on user demand. Dynamic spectrum sharing (DSS) may be deployed on existing 4G LTE equipment as long as it is compatible with 5G NR. Only the 5G NR terminal needs to be compatible with DSS.

Standalone mode

The standalone (SA) mode of 5G NR refers to using 5G cells for both signalling and information transfer.It includes the new 5G Packet Core architecture instead of relying on the 4G Evolved Packet Core, to allow the deployment of 5G without the LTE network. It is expected to have lower cost, better efficiency, and to assist development of new use cases.

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