DSS Part-1
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
In this article, we will discuss
about Dynamic spectrum sharing abbreviated as DSS
What is spectrum refarming?
It is the process of redeploying
spectrum from available users and re-allocating it to others. Legacy technology
must be eliminated from a part of the spectrum, which must then be allocated
for the new technology. It was not possible for operators to share the spectrum
between different technologies but, spectrum refarming from LTE to 5G will be
simpler with Dynamic Spectrum Sharing (DSS) which is introduced in 3GPP r15.
5G
and LTE can occupy the same spectrum band from the control channel point of
view, and the resources are allocated dynamically between the two technologies
depending on the instantaneous device distribution and capacity needs. As many
LTE bands have been refarmed as NR bands how to share the same spectrum between
LTE and NR is an important issue, which can potentially affect the network
efficiency and UE performance significantly.
What is DSS?
Dynamic Spectrum Sharing (DSS) is
a technology that allows the deployment of both 5G NR and 4G LTE in the same
frequency band and dynamically allocates spectrum resources between the two
technologies based on user demand (UE has to support this feature).
Why can’t operators re-use old spectrum from obsolete networks (NR network)?
As we know that huge volumes of
connected devices from industrial IOT to emergency services are still using 2G,3G
and 4G networks (supported SIM card also). Thus operators face a unique
challenge in this technology generation. According to the GSMA Intelligence’s Network
Transformation 2020 report only a 31 percent of operators identified spectrum
refarming as a top three RAN priority despite many of the same MNO highlighting
spectrum scarcity as a key barrier to 5G rollout.
The widespread rollout of 5G
using mmWave spectrum is not realistic due to the very limited coverage of
these frequencies demands enormous infrastructure investment. Also, there is
simply not enough mid- and low-band spectrum currently available to provide the
huge data capacity 5G will require. But there are some short-term solutions to
these challenges which will allow operators to better manage their network
assets.
The first is carrier aggregation
(CA): CA is a technology that allows operators to deploy 5G using two or more
bands in tandem, integrated together as one big block. This will enable
operators to deploy a high level blanket of 5G using mid-band, while adding
capacity in dense urban areas using mmWave.
The second technology is DSS:
This emerging technology allows 4G and 5G to exist simultaneously on the same
band, while adjusting the BW allocated to each generation dependent on demand.
This has clearly ideal for low-band rollout, as it will allow operators to
continue to use valuable spectrum for LTE, while adding NR capacity as demand
grows. But at the same time whether it will be enough to address the looming
issue of massive data demand on 5G networks remains to be seen.
Advances and challenges of DSS in 5G wireless networks with full duplex technology:
FD (Full Duplex) technology is
considered to be one of the candidate technologies for 5G and beyond wireless
communication systems due to its advantages including potential doubling of the
capacity and increased spectrum utilization efficiency.
It also enables a radio
to transmit and receive on the same frequency band at the same time. However, mitigation
of strong Self Interference is one of the main challenges of the FD technology.
But the recent advances in different Self interference cancellation techniques
like analog cancellation, antenna cancellation, and digital cancellation
methods have permitted the feasibility of using Full duplex technology in many
wireless applications.
Important application area is DSS
in NR (5g) networks, where Full Duplex can provide several benefits and
possibilities such as Concurrent Transmission and Reception, improved sensing
efficiency and secondary throughput, Concurrent Sensing and Transmission and
the mitigation of the hidden terminal problem.
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
Thank you for shharing
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