Spectrum sharing is starting to emerge as a primary means for supporting 5G and advanced 4G, without the time and expense of frequency division that has characterized prior mobile network transitions.
In June 2018, the 3GPP standards group approved the completion of 5G New Radio (NR) specifications that support coexistence of 4G LTE and 5G NR within the bandwidth of an LTE carrier in both the downlink and uplink. In other words, In other words, the same block of spectrum can support users on both 4G and 5G networks, as Ericsson demonstrated recently.
It means end user experience can be more seamless when roaming into areas where 5G is not yet deployed.
It also makes the transition of networks easier. Instead of switching between frequency blocks, and dedicated spectrum for both networks, the cellular air interface can work on either a 4G or 5G platform, at least initially, when 5G user volumes might be relatively light.
That will allow a more graceful scaling of 5G physical infrastructure builds. Both AT&T and Verizon plan to use that capability to migrate traffic from their current 4G LTE networks to their new 5G networks.
Essentially will allow 4G and 5G users to take turns using the exact same chunk of spectrum, which will be useful for 5G handset users operating in areas where full 5G infrastructure is not yet deployed.
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