Dynamic spectrum sharing--the ability to use 4G spectrum to support 5G devices--is a major way 4G networks can be viewed as integral parts of 5G. That applies to 5G and 4G radios and resources on the same mast, or on different masts.
Using spectrum sharing in this way, 4G resources effectively become 5G resources. It is more than using optical backhaul originally built for 4G and then extended to support 5G at the same towers. It is more than having a base of 4G small cells that also can be used to support 5G.
Dynamic spectrum sharing means 4G spectrum can directly be used by 5G devices, from the same or a nearby mast. In that use case, 4G spectrum and bandwidth is directly available for use by a 5G device.
In a larger sense, there are two ways of looking at 4G mobile networks: the precursor to 5G or part of 5G. So 4G coverage, latency and speed might be viewed either as a problem 5G will fix, or part of the way 5G will improve user experience over 4G levels.
If one takes the latter view--that 4G is a part of the 5G experience--then countries with better 4G might well have better 5G as well, in part because dynamic spectrum sharing can be used, perhaps in part because optical backhaul networks are more developed, in part because radio sites can be reused.
On a speed dimension, that includes South Korea, Norway, Canada, the Netherlands, Singapore, Austria, Switzerland, Denmark, Belgium and Japan, among others.
On the coverage dimension,
On the coverage front, South Korea, Japan, Norway, Hungary, the United States, the Netherlands, Taiwan, Hungary, Sweden and India, among others, have 4G coverage that will help them in the 5G area as well. Perhaps the most-surprising fact is that India is among the nations globally with the most-extensive 4G network coverage.
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