DSS Part-2
Home LTE NB-IoT 5G(NR-NSA)
Reference:
3GPP TS 38.331
3GPP TS 38.221
3GPP TS 36.331
https://www.researchgate.net/publication/330188547_RF_Self-interference_Cancellation_for_Full-duplex_Communication_by_Using_Photonic_Technique
https://www.researchgate.net/publication/269306294_Adaptive_transmission-reception-sensing_strategy_for_cognitive_radios_with_full-duplex_capabilities
RP-191042, Enhancements for dynamic spectrum sharing in Rel-16, Ericsson, RAN #84, 3-6 June 2019
DSS:
When it comes to deploying 5G, spectrum is a
key differentiator for operators. And while 24 GHz millimeter wave (mmWave)
spectrum is being auctioned specifically for 5G, mid-band spectrum will be
critical for operators to get widespread 5G coverage across their markets.
That’s why a technology called DSS (dynamic spectrum sharing) is so compelling.
This technology, which is part of the 3GPP Release 15, allows operators to
dynamically allocate some of their existing 4G LTE spectrum to 5G and use existing
radios to deliver 5G services by deploying a software upgrade.
DSS allows 4G and 5G to exist simultaneously
on the same band while adjusting the bandwidth allocated to each generation
dependent on demand. This is clearly ideal for low-band rollout, as it will
allow operators to continue to use valuable spectrum for LTE, while adding 5G (NR) capacity as demand grows. But whether it will be enough to address the looming
issue of huge data demand on 5G (NR) networks remains to be seen.
Let’s put it this way: Without DSS, an
operator that has 20 MHz of mid-band spectrum would have to split that spectrum
in two. In other words, operators would have to allocate 10 MHz of spectrum to
4G LTE and cram all their LTE users into that 10 MHz of spectrum.
Then the
remaining 10 MHz of spectrum could be used for 5G, even though initially there
will only be a minimal number of 5G users. With DSS, an operator doesn’t have
to split that mid-band spectrum or have dedicated spectrum for either LTE or
5G. Instead, operators can share that 20 MHz of spectrum between the two
technologies.
DSS in the time and frequency domains, allows one to have
full bandwidth for LTE and for 5G from the control channel point of view while
the data channel resources are shared dynamically between the two radios. DSS
requires fast coordination between LTE and 5G packet schedulers.
For NR downlink transmission, either semi-static or
dynamic spectrum sharing mode can be applied from network perspective. For the
semi-static mode, the spectrum sharing strategy will keep the same in the
second-level time duration. For the dynamic spectrum sharing, the strategy can
be changed with a smaller time domain granularity with RRC and/or DCI
configuration.
NR UE can
support the semi-static spectrum sharing between LTE network and NR network via
the following approaches.
- NR UE can support BWP switching via RRC signaling, timer, or DCI signaling to implement the semi-static spectrum sharing. When the traffic load in LTE decreases and that in NR network increases,the LTE network can share the spectrum to the NR network by reducing the number of LTE aggregated carriers or switching off the LTE network,and the NR network can enlarge the NR bandwidth by BWP switching and vice versa.
- NR UE can support RB-level RateMatchPattern configuration to achieve FDMed multiplexing between LTE and NR, where the resources corresponding toRateMatchPattern could be used for LTE network.
- Carrier-level spectrum sharing can also be achieved only by network scheduling without BWP switchingorRB-level RateMatchPattern. When the LTE carrier is on, NR networks can schedule NR UEs within some portions of system BW and other remaining bandwidth can be used by the LTE networks.
In the next section, we will learn more about DSS and its basic and advance level stuff. So keep reading……. And Stay tune……………
Pinal Dobariya………..
Reference:
3GPP TS 38.331
3GPP TS 38.221
3GPP TS 36.331
https://www.researchgate.net/publication/330188547_RF_Self-interference_Cancellation_for_Full-duplex_Communication_by_Using_Photonic_Technique
https://www.researchgate.net/publication/269306294_Adaptive_transmission-reception-sensing_strategy_for_cognitive_radios_with_full-duplex_capabilities
RP-191042, Enhancements for dynamic spectrum sharing in Rel-16, Ericsson, RAN #84, 3-6 June 2019
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