Fixedmobile Convergence: Structural convergence Impact of radio - - PowerPoint PPT Presentation

IEEE HPSR Conference | Budapest, 2015 July 1-4 | FMC Tutorial | Structural Convergence 1 1 This ongoing work receives funding from the European Union's Seventh Framework Programme (FP7/2007-2013) under grant agreement n° 317762 “COMBO project”

Fixed–mobile Convergence: Structural convergence Impact of radio coordinaTon on design of access and aggregaTon network

Dirk Breuer Tibor Cinkler Stéphane Gosselin Annie Gravey Ali Hamidian Stefan Höst Tahar Mamouni Péter Olaszi Stephan Pachnicke Björn Skubic Jose Torrijos Gijón Erik Weis, Frank Geilhardt, Thomas Monath, Sandro Krauß Deutsche Telekom Laboratories, Germany Budapest University of Technology and Economics, Hungary Orange R&D, France Telecom Bretagne, France Ericsson Research, Sweden Lund University, Sweden Orange R&D, France AITIA InternaTonal, Inc., Hungary ADVA OpTcal Networking SE, Germany Ericsson Research, Sweden Telefónica InvesTgación y Desarrollo, Spain Deutsche Telekom Laboratories, Germany

IEEE HPSR Conference | Budapest, 2015 July 1-4 | FMC Tutorial | Structural Convergence 2 2

§ CreaGon of interference § CoordinaGon between Macro Base StaGons and Small Cells is required for co- channel operaGon, opGonal for dedicated channel deployment § Many different coordinaGon schemes and algorithms with different requirements

• n the backhaul

§ Simplest schemes also work via tradiGonal backhaul

• Significant capacity increase requires co-ordinaGon between small cells and

macro sites in co-channel operaGon

• CoordinaGon for eNodeB is done via X2 interface

Heterogeneous networks

Small cell deployment requires coordinaTon

CoordinaGon is key

IEEE HPSR Conference | Budapest, 2015 July 1-4 | FMC Tutorial | Structural Convergence 3 3

CoordinaTon gains in heterogeneous deployments

Coordina(on Classifica(on Coordina(on Feature Max Throughput Gain Max Capacity Gain Delay Class Very Tight CoordinaGon Fast uplink CoMP

(uplink joint recepGon/ selecGon)

High High 0.1-0.5 ms Fast downlink CoMP

(coordinated link adaptaGon, coordinated scheduling, coordinated beamforming, dynamic point selecGon)

Medium Medium Combined Cell Medium Tight CoordinaGon Slow uplink CoMP Medium Small 1-20 ms Slow downlink CoMP

(e.g., Postponed Dynamic Point Blanking)

Small Moderate CoordinaGon FeICIC Medium Small 20-50 ms Small gain: ≤20% Medium gain: 20-50 % High gain: ≥ 50%

IEEE HPSR Conference | Budapest, 2015 July 1-4 | FMC Tutorial | Structural Convergence 4 4

§ X2 interfaces are collocated, X2 delay close to zero § Fulfils inherently X2 delay requirements for CoMP < 0.5 ms § RRU-BBU delay << 1 ms (typically 0.4 ms assumed) § An interconnecGon of X2 interface required, link distances between sites will cause delay. § To support CoMP delay < 0.5 ms requires interconnecGon of CO or Main CO locaGon § Backhaul: X2 connecGon on CO/Main CO needs to support CoMP with delay < 0.5 ms § Fronthaul: Fulfils inherently X2 delay requirements for CoMP < 0.5 ms Fronthaul

Backhaul and fronthaul with CoMP coordinaTon via X2-Interface

Backhaul

IEEE HPSR Conference | Budapest, 2015 July 1-4 | FMC Tutorial | Structural Convergence 5 5

RAN topology examples

All Backhaul (BH)

Source: NGMN Alliance, RAN EvoluGon Project, Backhaul and Fronthaul EvoluGon, May 2014

Mix of SC FH and MBS BH

IEEE HPSR Conference | Budapest, 2015 July 1-4 | FMC Tutorial | Structural Convergence 6 6

CoordinaTon architectures overview

MBS: Macro base StaGon BBU: Baseband Unit CoMP: Coordinated MulGpoint

CoMP architectures – Wireless backhaul / fronthaul soluGons not in focus

Backhaul Centralised Controller

Fronthaul Backhaul

Backhaul Controller at MBS FH BBUH & Controller in Main CO BH Controller in Core BH Controller in Main CO BH Xn/X2 interface

• ver BNG

BH SC direct Xn & MBS X2 over BNG

Mix of SC FH & MBS BH

Mix BBUH & Controller in Main CO Mix BBUH & Controller at MBS Mix SC CPRI & MBS X2

• ver BNG

Mix SC CPRI & MBS Ctrl. in Main CO BH SC direct Xn & MBS

• Ctrl. in

Main CO

IEEE HPSR Conference | Budapest, 2015 July 1-4 | FMC Tutorial | Structural Convergence 7 7

Backhaul architecture scenario: Controller at the Main Central Office

– Centralised controller at Main CO for coordinaGon (RTT < 400 μs) – Bypassing BNG via direct terminaGon of access links at controller to fulfil the CoMP latency requirements – This variant aims at an ideal backhaul with very low latency – This variant could be combined with decentralisaGon of mobile core funcGonaliGes

MBS: Macro Base StaGon SC: Small Cell ODF: OpGcal DistribuGon Frame (pure passive) CO: Central Office BNG: Broadband Network Gateway

IEEE HPSR Conference | Budapest, 2015 July 1-4 | FMC Tutorial | Structural Convergence 8 8

Fronthaul architecture scenario: BBU hotel & controller at the Main CO

– BBU hotel and central controller in Main CO for baseband processing and coordinaGon – Bypassing BNG via direct terminaGon of Fronthaul links at BBU hotel – Very low latency < 400 µs (RTT) and high CPRI data rate allow inherent CoMP scheme support

CPRI: Common Public Radio Interface MBS: Macro Base StaGon ; SC: Small Cell ODF: OpGcal DistribuGon Frame (pure passive) CO: Central Office BNG: Broadband Network Gateway

IEEE HPSR Conference | Budapest, 2015 July 1-4 | FMC Tutorial | Structural Convergence 9 9 This ongoing work receives funding from the European Union's Seventh Framework Programme (FP7/2007-2013) under grant agreement n° 317762 “COMBO project”

Presented by annie.gravey@telecom-bretagne.eu peter.olaszi@aiTa.ai bjorn.skubic@ericsson.com

Dirk Breuer Tibor Cinkler Stéphane Gosselin Annie Gravey Ali Hamidian Stefan Höst Tahar Mamouni Péter Olaszi Stephan Pachnicke Björn Skubic Jose Torrijos Gijón Deutsche Telekom Laboratories, Germany Budapest University of Technology and Economics, Hungary Orange R&D, France Telecom Bretagne, France Ericsson Research, Sweden Lund University, Sweden Orange R&D, France AITIA InternaTonal, Inc., Hungary ADVA OpTcal Networking SE, Germany Ericsson Research, Sweden Telefónica InvesTgación y Desarrollo, Spain

Annie Gravey Péter Olaszi Björn Skubic