Sunday, May 22, 2022

Home 5G knowledge How 5G DSS Works ?

How 5G DSS Works ?


When NR TDD spectrum is not yet available, spectrum sharing enables  pooling of radio resources in both UL and DL directions according to instant needs and pre-defined policies between LTE and NR (5G), below the working principle :

  • NR signals are transmitted over unused LTE resource
  • With LTE, all the channels are statically assigned in the time-frequency, the NR physical layer is extremely flexible for reference signals, data and control channels
  • Only 5G devices are made aware of DSS
  • Existing LTE devices remain unaffected (i.e. LTE protocols in connected or idle mode)
  • LTE PDSCH and NR PDSCH can coexist by using different set of RBs

What are the key UE features used for DSS ?

  1. SSB allocation on MBSFN subframes (supported by UEs above Rel8)

=> to handle NR Synchronisation Signals (SS Block)  collision with configuration LTE Signals

2. LTE CRS rate matching or symbol/RB rate matching => to map around LTE signals PBCH/PSS/SSS,PDCCH region, etc. and avoid NR transmissions colliding with them

 


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Benefit from Massive discount on our 5G Training with 5WorldPro.com

The most complete and comprehensive 5G course, follow this link for more information

Start your 5G journey and obtain 5G certification

contact us:  contact@5GWorldPro.com
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