Introduction to NR

  • New spectrum is a target
  • Multi-antenna technologies
  • Multi-site coordination
  • Access integration
  • D2D communication
  • Ultra lean design

5G RRC

RRC inactive state

In NR, evolution of new RRC state keeping S1* connection up.

Need for RAN controlled sleep state

5G sleep state should support

  • DRx with preferably lower power consumption than today.
  • UE context is maintained in RAN.
  • UE controlled mobility
  • RAN paging within local areas.
  • No CN signalling required

RRC state

  • RRC_IDLE
  • RRC_INACTIVE
  • RRC_CONNECTED

Combined LTE/NR states

NR cell

It is defined by the SS-Block and SIB table. Cells can have same access configuration and SIB table doesn’t require to be cell unique

NR cell size determined by

  • IDLE/RRC INACTIVE control load
  • Synchronized transmission timing

Frequency carrier # NR cell

NR cell : broadcast when IDLE UE’s are expected to find/camp on it and report the carrier when doing frequency/cell search for IDLE mobility.

Frequency carrier



System broadcast

To separate the CP and UP, system broadcast should be transmitted independently from the user plane data. System information is separated int0 ‘minimum SI’ and ‘ other SI’ .

SS Block

  • SS : NR-PSS / NR-SSS
  • NR-PBCH : contains a MIB
  • Transmitted every X ms

SIB Block

  • Contain the configuration for system access
  • May contain SI for more than one cell
  • A SIB can contain several access configurations