Chapter 4

Main Radio Interface Related System Procedures

Jorma Kaikkonen

Jorma Kaikkonen

Nokia Bell Labs, Finland

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Sami Hakola

Sami Hakola

Nokia Bell Labs, Finland

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Emad Farag

Emad Farag

Nokia Bell Labs, USA

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Mihai Enescu

Mihai Enescu

Nokia Bell Labs, Finland

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Claes Tidestav

Claes Tidestav

Ericsson, Sweden

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Juha Karjalainen

Juha Karjalainen

Nokia Bell Labs, Finland

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Timo Koskela

Timo Koskela

Nokia Bell Labs, Finland

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Sebastian Faxér

Sebastian Faxér

Ericsson, Sweden

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Dawid Koziol

Dawid Koziol

Nokia Bell Labs, Poland

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Helka-Liina Määttänen

Helka-Liina Määttänen

Ericsson, Finland

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First published: 24 April 2020

Summary

The use of beamformed signals for initial access is due to the need of scaling the system across the carrier frequencies due to the nature of mandatory beamforming in higher carriers. One of the fundamental elements of beam management is the concept of beam correspondence. This should be seen as a node capability. To enable the plurality of transmission and precoding strategies that are possible to implement with the standard, NR features a flexible and modular channel-state information framework. Radio link failure (RLF) is a procedure where the user equipment (UE) autonomously determines that the radio link is lost. The UE does this by checking whether certain conditions are fulfilled, in which case it declares RLF and performs the associated actions. The basis for radio resource management values are Reference Signal Received Power and Reference Signal Received Quality values.

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