The document provides an overview of the SPEED-5G project, which aims to develop enhanced dynamic spectrum access (eDSA) as an enabler for 5G performance metrics like 100x more connections and 1000x more capacity. The project involves designing new flexible MACs and a hierarchical radio resource management framework. It also defines eDSA and details two new MAC protocols (DCS-MAC and FBMC-MAC) and the MAC/RRM framework. System simulations showed the new MACs significantly increase area spectral efficiency over WiFi and LTE. The project achieved its goals of developing an eDSA framework and validating novel MACs and RRM algorithms through proofs-of-concept.

1. 07-03-2018
Klaus Moessner (project coordinator)
Overview of SPEED-5G
www.speed-5g.eu

2. Outline
17
4 Project overview
4 Unlicensed spectrum and 3GPP
4 eDSA definition
4 MAC/RRM framework
4 Technical highlights
SPEED-5G workshop, London, 07/03/2018

3. Project overview -
what’s it about ?
18
New
flexible
MACs
Radio
resource
management
eDSA
4 Enhanced Dynamic Spectrum Access
as an enabler for 5G KPIs of 100x
connections, 1000x capacity and provision of
QoS and QoE
4 eDSA is MAC + Radio Resource Management -
the main project innovations
4 Actually there are two new MACs designed in
the project with different characteristics
4 The Radio Resource Management is hierarchical
with centralised and distributed parts
SPEED-5G workshop, London, 07/03/2018

4. eDSA in a bit more context
19
4 cRRM:
➨ One per several hundred
cells
➨ Spectrum portfolio and
policy
➨ KPI policing and OSS
interface
➨ Co-ordination across
dRRMs
4 dRRM
➨ In every cell
➨ Allocates channels and
resources to sessions
4 DCS-MAC (Dynamic Channel
Selection)
4 FBMC-MAC (FBMC is a 5G
variant of OFDM)
SPEED-5G workshop, London, 07/03/2018

5. 20
eLWA features: Uplink support, enhanced mobility, optimizations for high data rate 802.11 technologies (802.11ax, 802.11ad
and 802.11ay)
eLAA features: Dual-connectivity, Support for cells w/o ideal-backhaul (non-collocated)
NB. Only Rel. 15 related WI : “LAA/eLAA for the CBRS 3.5GHz band in the United States”
Unlicensed Spectrum & 3GPP
eLWA
eLAA
Rel. 15
?
“tight”
integration/inter-working
Rel. 14Rel. 13Rel. 12Rel. 11Rel. 10
LTE/WLAN
interworking
LTE over
unlicensed
Offload
Aggregation
WLAN
Offload
RAN-assisted
interworking
LWIP
RAN-controlled
interworking
LWA
LTE-U
LTE-LAA
SPEED-5G workshop, London, 07/03/2018
2010 20192016

6. eDSA Definition
21
4 eDSA is a combination of MAC and RRM
4 eDSA is abstracted in Speed-5G by ultra-densification through small cells,
additional spectrum, and exploitation of resource across technology silos,
4 eDSA jointly manages several spectrum bands, cells, and technologies in
order to offer increased capacity and improved QoE,
4 eDSA provides a framework for heterogeneous spectrum aggregation and
inter-RAT load balancing (extended to unlicensed and lightly-licensed
bands), in order to aggregate resources from different RATs and different
licensing regimes
SPEED-5G workshop, London, 07/03/2018

7. MAC/RRM Framework
22
4 The focus of SPEED-5G is developing a sustainable MAC/RRM framework,
capable of supporting and accommodating current and future
PHY/MAC/RRM designs and algorithms with multi-RAT support, for 5G and
beyond
4 SPEED-5G has developed a 5G air-interface protocol stack supporting the
eDSA concept
4 The joint MAC/RRM framework is extensible and future-proof
4 The MAC/RRM design supports system operation over technology-specific
bands with non-contention based access, and technology-neutral bands
with contention and non-contention based access
4 New interfaces defined to facilitate communications between MAC sub-
layers and also between the MAC and cRRM
4 This framework has defined a harmonization point at MAC layer in order
to integrate legacy RATs and new 5G air-interface variants and ensuring
backwards compatibility with legacy RATs
SPEED-5G workshop, London, 07/03/2018

8. 23
MAC/RRM Framework
cRRM-based operation
for increased efficiency in
inter-cell coordination
functions e.g.
coordination of
interference
management, load
balancing and Call
Admission Control.
SPEED-5G workshop, London, 07/03/2018

9. Technical achievements
MAC framework
24
Advantages:
4 Offers “tight” interworking with “licensed, unlicensed and lightly-licensed”
4 No need for new bearer definitions (split / shared bearers as in LWA)
4 Aggregation/offload at “packet/RLC SDUs” granularity
4 Supports legacy dRRM approach as well as cRRM/dRRM hierarchical approach, for (cell) cluster-wide
resource management
4 Takes advantage of ALL available spectrum resources in heterogeneous multi-RAT environments
4 Fall-back to LTE or WiFi only, if required
4 Corresponds to CU-DU split “option 5”
4 Flexibility to transmit control signalling over arbitrary air interface (not supported in LWA)
4 Faster adaptation to changing channel conditions (compared to LWA there is no loss of buffered data,
which may in turn lead to significant fluctuations of TCP traffic).
4 Reuse of built-in RLC reordering (and no need for PDCP buffering/re-ordering which is required by LWA)
But requires:
4 Support of split-MAC concept at both the eNB/gNB & UE
4 Need for ideal/near-ideal FH (in case of CU-DU split 5, in non-collocated scenarios): The timing
requirement of signalling and data under functional splits intra MAC is strict.
* R3-161813, "Transport requirement for CU&DU functional splits options", CMCC
++ R3-162102, " CU-DU split: Refinement for Annex A (Transport network and RAN internal functional split)", NTT DOCOMO, INC.

10. 4 Uses offload and aggregation, whereas legacy has one or the other
4 Switch layer is MAC, whereas legacy is layer 3 or PDCP
4 Offload granularity is packet whereas legacy is APN or bearer
25
Technical achievements
MAC improvements over legacy

11. Technical achievements
RRM framework
26
4 The cRRM layer integrates cell control, air-interface control plane and signalling
(via interfaces identified) , thus providing inter-layer coordination for multiple
cells
4 Novel RRM mechanisms/functions including for cooperative sensing, cross-carrier
and cross-RAT scheduling have been explored in order to enhance and enable
heterogeneous resource aggregation
4 Context-aware service-oriented RRM with dynamic allocation schemes for
enabling eDSA concept, is supported
SPEED-5G workshop, London, 07/03/2018

12. Technical achievements
RRM framework implementation
27
4 Support of legacy & Speed-5G RRM
algorithms,
4 Abstraction layer
4 Framework and algorithms are
decoupled
4 Easy to create and test
functionalities
4 Interfaces to external entities
e.g. spectrum manager, OSS/OAM …
SPEED-5G workshop, London, 07/03/2018

13. Technical achievements
RRM algorithms
28SPEED-5G workshop, London, 07/03/2018

14. Technical achievements
Backhaul
29
4 Increased throughput per BH link and capacity per area by
➨ Increasing channel bandwidth & aligned sector collocation
4 Reduced hop latency by
➨ Increasing modem speeds using advanced HW
➨ Frame-based latency reduction algorithm
4 Increased network availability by
➨ Failsafe attributes in CS (1:1) & TS (auto frequency scanning)
4 Balancing of resources by
➨ Automatic TS entry at provisioning
SPEED-5G PtMP backhaul development board Backhaul 28GHz RF module
SPEED-5G workshop, London, 07/03/2018

15. Technical achievements
notable highlights
30
Evaluation results based on system-level simulations:
4 DCS-MAC & FBMC-MAC designs have been compared against each other as well as
LTE and IEEE 802.11ac
4 The simulations scenarios consider different traffic models (full buffer and bursty
traffic), ISD range (30 – 100m), as well as coexistence with WiFi systems.
4 Area Spectral Efficiency (b/s/Hz/km2):
➨ DCS-MAC provides ~ 500% higher ASE, compared to 802.11ac WiFi
➨ DCS-MAC provides ~ 40% higher ASE, compared to LTE (excl. CA and no MIMO)
➨ FBMC-MAC provides 2x higher ASE, compared to 802.11ac WiFi
➨ DCS-MAC results in 2x higher ASE, compared to FBMC-MAC (in DL)
➨ DCS provides better cell-edge throughputs, than in LTE
➨ even higher gains for DCS could be shown (against LTE), if LTE control channels had been modelled
4 Coexistence:
➨ When coexistence with other systems is considered, FBMC MAC provides better results, as the LBT
feature induces a fair access with a system like WiFi,
➨ Equivalent mean occupancy time (in DCS and FBMC vs WiFi), but in dense deployments more WiFi
APs can be blocked by DCS (up to 70%), due to lack of LBT (but this can be added to DCS)
SPEED-5G workshop, London, 07/03/2018

16. Technical achievements
31
In summary
4 Design and validation of eDSA capable multi-RAT MAC/RRM framework,
including specification of interfaces, primitives etc.
4 Design and validation 2 novel MAC protocols:
➨ System-level Simulations, Hardware-in-the-Loop tests,
4 Demonstration of capabilities via Proof-of-concepts (PoC)
➨ Multiple test-cases defined and evaluated per PoC
4 Multiple new RRM algorithms designed & evaluated
4 Advanced backhaul solution in support of eDSA, superior in terms
of throughput, reliability and delay
SPEED-5G workshop, London, 07/03/2018

17. Key project results
32
4 Increase in Area Spectral Efficiency (b/s/Hz/km2):
➨ DCS-MAC provides 5x higher than 802.11ac WiFi, and 40% higher than LTE
R10 (excl. CA and no MIMO)
➨ FBMC-MAC provides 2x higher than 802.11ac WiFi
4 DCS-MAC has more gains but FBMC-MAC is better at co-
existence
➨ FBMC MAC has LBT feature that enables fair access with WiFi,
➨ In dense deployments more WiFi APs can be blocked by DCS
4 Downstream routes are products, standards and publications
➨ Intracom have developed wideband point to multipoint wireless backhaul
➨ Contributions to CEPT PT1, 3GPP and IEEE
➨ Papers and magazine articles
SPEED-5G workshop, London, 07/03/2018

18. 33
Thank you for your attention!
SPEED-5G workshop, London, 07/03/2018
Acknowledgment:
The research conducted by Speed-5G receives funding from the European Commission H2020 programme under
Grant Agreement N : 671705. The European Commission has no responsibility for the content of this
presentation.
Find us at www.speed-5g.eu