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SPEED-5G Report Summary

Project ID: 671705
Funded under: H2020-EU.

Periodic Reporting for period 1 - SPEED-5G (quality of Service Provision and capacity Expansion through Extended-DSA for 5G)

Reporting period: 2015-07-01 to 2016-06-30

Summary of the context and overall objectives of the project

The dramatic increases in the demand for data services over mobile communication networks has been driving the requirements for 5G systems, calling for 1000 times more capacity as well as 1ms maximal latency, highest possible quality of experience and seamless connectivity. To meet these targets, operational and infrastructure changes will be required that will incur costs. At the same time average revenue per user (ARPU) is expected to remain flat at best, in mature markets. Therefore, there is an imperative need for technologies that will improve cost-efficiency. So, a major challenge for future networks is to map traffic of various types (and QoS requirements) across the most appropriate radio technology and spectrum bands to serve the ever increasing traffic demands at the right price. Efficient exploitation of heterogeneous wireless system resources, together with densification of cellular networks to provide higher capacity and support QoE, constitute fundamental observations from SPEED-5G on current status and the direction of evolution of wireless networks.
The focus in SPEED-5G is on three dimensions to increase capacity: dense deployment of small cells (ultra-densification), additional spectrum and exploitation of resource across technology silos (which translate to today’s spectrum silos). In the longer run, it is expected that 5G will operate under a variety of spectrum and regulatory models. In SPEED-5G, this 3 dimensional model (densification, multi-technology, additional spectrum) is referred to as extended-Dynamic Spectrum Access (eDSA), where heterogeneous technologies are managed simultaneously in order to improve spectrum utilization, support capacity increase and service provision with improved quality of experience. SPEED-5G intends to break spectrum and technology silos for optimal service provisioning and quality of experience, by addressing the following objectives:

• Develop disruptive wireless/mobile broadband networks elements that will be capable of considerably expanding their capacity through densification.
• Develop mechanisms for optimal use of heterogeneous technologies and support enhanced dynamic access to diversified spectrum resources. SPEED-5G aims to develop an optimized resource management across heterogeneous i.e. multi radio-access, technologies leading to economically sustainable solutions.
• Design and implementation of new MAC/RRM protocol framework, through appropriate splitting of the intelligence and support of FBMC PHY due to its flexibility in exploiting fragmented spectrum and light synchronised requirements.

Work performed from the beginning of the project to the end of the period covered by the report and main results achieved so far

The project has defined the eDSA as a key concept. In deliverable D4.1, preliminary strategies for optimizing the resource management over heterogeneous access technologies and dynamic spectrum allocation are defined. The initial designs will be enhanced and future deliverables will report on system level simulation results for comprehensive evaluation of proposed schemes. Progress on breaking the technological silos in a more flexible way by exploiting and improving advanced flexible wireless PHY technology has been achieved in WP5. Deliverable D5.1 focuses on definition of a MAC framework and fine tuning the MAC design for supporting different FBMC numerologies in order to have highly flexible AIV capable of satisfying both Mobile Broadband (MBB) and massive IOT (mIoT) connectivity requirements. SPEED-5G has released the first version of the FMBC enabled MAC design, capable of operating over both licensed and unlicensed bands with non-contention and contention based access mechanisms respectively.

Progress beyond the state of the art and expected potential impact (including the socio-economic impact and the wider societal implications of the project so far)

SPEED-5G’s fundamental technical achievements and progress beyond the state of the art are related to the development of the enhanced Dynamic Spectrum Allocation (eDSA) paradigm, the main concept introduced by SPEED-5G to the 5G technology. The main technical achievements of the project so far, are:

• eDSA definition:
o SPEED-5G has defined a new radio resource abstraction paradigm termed eDSA where several spectrum bands cells and technologies, are jointly managed in order to offer improved QoE and capacity increase.
o The eDSA paradigm provides spectrum/radio-environment awareness, a framework for heterogeneous spectrum aggregation, and for 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 Enhanced Architecture:
o A detailed definition of the SPEED-5G Cloud Edge architecture has been developed, comprising the required building blocks for supporting the eDSA function across the entire network, providing the interfaces to a centralised LSA (Licensed Shared Access) controller.

• The joint MAC/RRM framework developed in SPEED-5G contains the necessary building blocks of both the RRM and the MAC layers, providing an extensible and future-proof framework
o The proposed 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
o The new interfaces facilitating communications between MAC sub-layers and also between the MAC and cRRM have been identified
o The framework has defined a harmonization point at the MAC layer in order to integrate legacy RATs and new 5G air-interface variants (AIVs) providing native support for 5G-AIVs and ensuring backwards compatibility with legacy RATs
o SPEED-5G MAC enables eDSA-based heterogeneous resource aggregation, for 5G systems, whilst ensuring support for legacy RATs like LTE or WiFi , also supporting the introduction of new 5G waveforms using cross-carrier scheduling
o The MAC framework relies on three new functional groups: coexistence coordination, eDSA inter-RAT coordination and measurement collection and reporting (the monitoring plane) group of functions
o The framework is able to support a variety of different MAC designs e.g. MAC design based on dynamic channel selection, principally aimed at MBB support, MAC design based on FBMC with different numerologies and capable of spectrum aggregation, to support MBB and mIoT
o Novel RRM mechanisms/functions including context-awareness, cooperative sensing, cross-carrier and cross-RAT scheduling have been explored in order to enhance and enable heterogeneous resource aggregation

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