Telecom Articles by Samir Amberkar: wp-scheduling-p1

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3GPP Modem
Simulator

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Article
Scheduling or Radio Resource Selection
by
Samir Amberkar
(published on 14-Aug-2022)

Introduction

The discussion is generic and may apply well to both LTE and 5G NR base stations. At every TTI time, MAC scheduler has the responsibility to choose radio resources for various purposes. Radio resources mean all resource elements, available in one TTI time across all resource blocks. A TTI time could further be seen as multiple symbols and a resource block could further be seen as multiple sub-carriers. A TTI time is typically one slot time for 5G NR and one subframe time for LTE.

Fig "Resource grid"

Perspectives

If we talk about resource, there are various perspectives here.

DL and UL

UL allocation happen via DL signalling. So, there is inherent relation between DL and UL resources. Additionally, in TDD, UL measurements may be used for deciding DL allocations. The same is not true for FDD; in FDD, we may need explicit DL measurements (by UE).


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