Chapter 8

Operation in Unlicensed and Shared Spectrum


The RF spectrum is divided into licensed and license-exempt/unlicensed bands. The traditional cellular communications systems used to exclusively operate in licensed spectrum. However, due to the insufficiency and cost of licensed spectrum below 6 GHz, the telecommunication industry has shifted attention to the unlicensed bands to deploy supplementary carriers or standalone systems. The use of unlicensed spectrum has been increasingly considered by cellular operators as a complementary mechanism to offload traffic from licensed-band RF carriers to increase the overall system throughput. Various approaches to cellular operation in the unlicensed spectrum have been investigated and trialed ...

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