DSS – Dynamic Spectrum Sharing 5G-LTE

Dynamic Spectrum Sharing (DSS) allows operating LTE and NR networks in the same frequency bands.

Dynamic Spectrum Sharing (DSS) is useful to allow operators to perform a soft refarming of the LTE spectrum towards NR. For Dynamic Spectrum Sharing support between LTE and NR in TDD bands.

Some operators do not possess New Radio (NR) spectrum resources at the early stage of 5G deployment. They need to use the existing LTE spectrum resources to deploy 5G networks. Some other operators have dedicated NR spectrum resources, but face the issue of a low spectrum usage due to the few 5G terminals at the early stage. LTE FDD and NR Flash Dynamic Spectrum Sharing allows for the sharing of low-band uplink and downlink spectrum resources between LTE FDD and NR. For operators that do not possess NR spectrum resources, this solution can be used to enable LTE to share the existing LTE spectrum with NR, allowing fast 5G deployment. For operators having dedicated NR spectrum resources, this solution enables NR to share spectrum with LTE, improving the spectrum usage. In this way, this solution achieves LTE and NR spectrum sharing in low-frequency bands and enables fast deployment of wide-coverage 5G networks.


Basic principles

LTE and NR dynamically share spectrum at the millisecond level. Each spectrum resource element can be used by only one RAT at a time.

Typical scenarios

  • LTE FDD and NR cells work on a 10 MHz, 15 MHz, or 20 MHz bandwidth, and full bandwidth sharing is supported.

Feature of LTE NR DSS

  • LTE NR Sharing Ratio between 10% to 60% 
  • 10,15, and 20 MHz cell bandwidth.
  • Slow (several minutes) sharing ratio updates
  • TDM based sharing in DL
  • Fixed sharing in UL
  • Support only in NSA deployment
  • UL transmission only over LTE
  • Admission Control affected by the sharing ratio.

Downlink Data: LTE/NR carriers are active in the same band based on TDM dynamic sharing.

TDM Dynamic Sharing

Uplink: Fixed Sharing Resources based on FDM.

10,15,20 Mhz bandwidth supported.