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Tony Tam – Fujitsu Network Communications
Peter K. Cho – Actus Networks/HFR, Inc
NG Fronthaul Network Requirements and Architecture
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NGFI Network Requirements and Architecture
Date: 2016-08-22 – 2016-08-24
Author(s):
Name Affiliation Phone [optional] Email [optional]
Tony Tam Fujitsu Network Communications
Peter Cho Actus Networks/HFR Inc. [email protected]
IEEE 1914 Next Generation Fronthaul Interface
Jingri Huang, [email protected]
Agenda
5G RAN Requirements and Network Architecture
NG Fronthaul Requirements and Network Architecture
Radio over Ethernet
4
5G Network Requirements
5
IMT 2020 5G Vision and Requirements White Paper May 2014
Revenue OPEX
CAPEX
6
5G RAN Network
Bullet Train Highly Reliable
QoE
7
5G RAN Network – Network Slicing
NG Fronthaul Key Requirements China Mobile NGFI Workshop June 2015
Transport Efficiency and Scalability Decouple MIMO Traffic - Massive MIMO processed at RRH to reduce transport
bandwidth
Traffic Load Adaptation – Dynamic Transport Bandwidth adaptive to User Traffic Load
Statistical Multiplexing – Tidal effect over large scale of RRHs
RAN Network Efficiency Centralize RAN Coordination Functions as much as possible
RAN Networking and Virtualization Dynamic Networking – Mesh Network, Load Balancing and vBBU switching
RAN Interface Agnostic Support CPRI and Radio over Ethernet (NGFI Packet, RF over Packet)
8
Tradeoff between Transport and RAN efficiency
Transport and RAN KPI Tradeoff – 4G LTE
9
China Mobile NGFI Workshop, June 4, 2015
0
2000
4000
6000
8000
10000
Method 1 Method 2 Method 3 Method 4 Method 5
180 225 125.2 498
9830
109 112.5 464.6
2689
9830
Down Link Up Link
0
0.5
1
Delay (Magnitude, ms)
Coordination Method 1 Method 2 Method 3 Method 4 Method 5
Down Link CS/CB CS/CB CS/CB, Non-coherent JT CS/CB, JT CS/CB, JT
Up Link CS/CB CS/CB CS/CB, Soft Information JR CS/CB, JR CS/CB, JR
20M LTE Carrier, 2 interface, 8x8MIMO, 100 Users Mbps
UE Processing, related to traffic Level
UE Processing, MIMO related
Cell Processing, unrelated to traffic level
Symmetric Split Cases
RRH
Potential Choices
Transport Efficiency
RAN Efficiency
Low Delay & Jitter High Time Sync. Accuracy
10
5G Transport and RAN KPI Tradeoff Dimensioning
TBD
5G Transport Network - UDN
11
Bullet Train
Fiber Rich within 1 km²
vBBUs locally to cap FH capacity locally
Easier to meet 5G RAN KPIs
Packet DAS option
Less Constraint on Transport Network Topology
Transport Layers depending on Traffic Load
Packet
WDM
Aggregation
Highly Reliable QoE
1km
RRUs
vBBU
cBBU
vBBU
1
Bullet Train Highly Reliable QoE
5G Transport Network – Low Latency
12
vBBU at C-BBU site (FH Fiber 100us latency) meet E-2E 1ms latency
Overlay over C-RAN topology with 5G RRU densification
Transport Network Topology limited by Fiber Routes
Transport Layers depending on Traffic Load
Packet
WDM
Aggregation
vBBU cBBU
RRUs
5G Transport Network – Dense M2M Network
13
vBBU may be locally due to dense devices & smaller cells
IoT Gateways needed to aggregate dense IoT devices to RRU
Transport Network Topology may be limited by Fiber Routes
Transport Layers depending on Traffic Load
Packet
WDM
Aggregation
Bullet Train Highly Reliable QoE
IoT GW
vBBU
cBBU
vBBU
RRUs
vBBU
5G Transport Network – 500+km/hour
14
Bullet Train
• 1G-10Gbps backhaul • WiFi Service
QoE Highly Reliable
5G network as WiFi backhaul
mmWave frequency
Backhaul for high speed train and Broadband service
1G to 10Gbps Backhaul speed
5G Transport Network – Highly Reliable
15
Redundant vBBUs are the Norm
Ring or Redundant Paths at the core Fronthaul network
RRU-vBBU Switching
Dual Node Interworking across two Rings at the optical layer
Multi-Chassis LAG across two Rings at the packet layer
Sub-50ms protection at the Optical Layer
Sub-50ms protection at the Packet Layer
Packet
WDM
Aggregation
Bullet Train Highly Reliable QoE
vBBU cBBU
RRUs
vBBU
Distributed Antenna
vBBU
cBBU
vBBU
RRUs
5G Transport Network – QoE
16
Packet
WDM
Aggregatio
Bullet Train Highly Reliable QoE
Massive Network MIMO raises the throughput effectively Massive MIMO on the RRU can be distributed to achieve it Similar to Outdoor Packet DAS Model Digital RF over Ethernet from Distributed Antenna to RRU
17
5G Transport Network – Network Slicing
vBBU
vEPC RoE FH
Ethernet BH
User/App ID Resource Blocks Scheduler
User/App ID V-LANs Scheduler
User/App ID RoE ID/V-LANs Scheduler
Radio Frames ID visibility under SON Server Guidance Slices are assigned to V-LANs and Groups Each Slice can traverse different FH path Each Slice can traverse different BH path Protection Switching based on Each Slice
V-RAN
18
Fronthaul Network
New Gen. RRU and BBU will support L1 to L3 functional split options symmetrically & asymmetrical upon demand
RRU may home to different vBBU and some RRU may be shutdown during off hour especially indoor
Fronthaul Network will adapt to topology change and bandwidth demand dynamically upon SDN control
RRUs
Software Defined Radio
Content Caching vSGW vPGW-D vBBU vMME
vPGW-C
EPC Control Functions
Centralized EPC
MME PGW PCRF
Mobile Edge Services
Disaggregated/Virtualized RAN
Disaggregated/Virtualized EPC
L3 L2 U-plane L2 Scheduling L1 Phy
FR
L1 FFT
Programmable Fronthaul Network
Programmable Functional Split Asymmetric
SDN VIrtuora SDN
Controller
SON Server
RRUs
Software Defined Radio
Content Caching vSGW vPGW-D vBBU vMME
vPGW-C
EPC Control Functions
Centralized EPC
MME PGW PCRF
Mobile Edge Services
Disaggregated/Virtualized RAN
Disaggregated/Virtualized EPC
L3 L2 U-plane L2 Scheduling L1 Phy
FR
L1 FFT
Programmable Functional Split Asymmetric
SDN VIrtuora SDN
Controller
SON Server
Radio over Ethernet
19
Time Sensitive Networking IEEE 802.1CM Profile for RoE
From TDM to Statistical Multiplexing Agnostic to Air I/F Technology Low Delay & Jitter Higher Time Sync Accuracy (1588v2 ns time accuracy)
CPRIoE RFoE RoE
High Time Sync Accuracy
IEEE 1914 NGFI
Architecture & Requirements RRH/BBU Partitioning Analysis
– 802.1ASbt Precise Timing Protocol Gen 2 (gPTP Gen 2) – 802.1Qbu Preemption (collaborating w/ 802.3br Interspersing
Express Traffic) – 802.1Qbv Time Aware Shaper (TAS) ─ Scheduled Traffic – 802.1Qca Shortest Path Control & Reservations – 802.1CB Frame Replication & Elimination – 802.1Qcc Stream Reservation Protocol Gen 1.1
IEEE 8021.CM Profiles based on the following standards
Fujitsu Proprietary and Confidential All Rights Reserved, ©2015 Fujitsu Network Communications
Framer/Mapper
Now merged into IEEE 1914
UE Data C&M Synchronization Frames
UE Data C&M Synchronization Frames
UE Data C&M Synchronization Frames
IEEE or MEF 5G Ethernet
Certification (TBD)
