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Confidential – Not to be Circulated www.comcores.com
Comcores Radio over Ethernet Gateway for Future
Fronthaul Networks
FG IMT-2020 Workshop and Demo Day
Anders Lund, Comcores ApS
Bomin Li, Comcores ApS
Thomas Nørgaard, Comcores ApS
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Agenda
About Comcores
Motivation for Ethernet Based Fronthaul
Comcores Overview on next generation fronthaul networks
Demo setup
Demo results
Comcores Headquarter
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About Comcores
Established in 2014
Globally oriented high-tech company, headquartered in Scion DTU Science Park, 20 min outside Copenhagen, Denmark
IP cores and design services for communication systems
Specialized in digital radio systems
Comcores Headquarter
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Motivation for Ethernet Based Fronthaul New fronthaul interface technologies are required to satisfy various RAN
deployment and evolution requirements, and reduce fronthaul transmission costs
Current dedicated point-to-point connection between BBUs and RRUs (such as CPRI/OBSAI) will evolve to many-to-many fronthaul mainstream switch networks (such as Ethernet) due to cost, availability and flexibility
Fronthaul architecture is migrating from traditional RAN where single BBU connects to single/few RRUs to architectures where multiple centralized BBUs connect to multiple RRUs making a packet switched technology ideal
Ethernet is a widely adopted & nearly ubiquitous standard technology
CPRI
BasebandRadio
Eth
Radio
Baseband Pool
Radio
Radio
Packet Fronthaul
EthEth
Eth
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Comcores Overview on next generation fronthaul networks
BaseBand
CPRI fiber connection
Virtual BBU Pool
BaseBandBaseBandBaseBand
RRHRF RRH
RRH RF
Time Sensitive Network (TSN)
SDN Controller
Aggregator
CPRIGW
C&M
Ethernet
Ethernet
RF
RF
L1 Offload
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Comcores gateway
Fits on both radio and base band side
support of CPRI, new radio interface and high speed Ethernet
Comcores All-in-One RAU system
Virtual BBU
BackhaulEthernet Fronthaul
Network (NGFI)
RAU
Pico
Macro
All-in-One Pico
Comcores RAU system
CPRI
RF/DFENGFISplit x
L1 offloadSplit 4
RoE
Eth
ern
et T
SN M
AC
&
PC
S
Pico
Macro
vBBU
vBBU
L1 processing resources
L1 processing resources
L1 processing resources
L1 processing resources
L2/L3 processing resources
Orchestrator
RoEEt
her
net
TSN
M
AC
& P
CS
Virtual L1 resource pool
RAU
RAURAU
NGFISplit x
RoE
Eth
TSN
M
AC
&
PC
SRF/DFE
vBBU
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Demo setup
IEEE P1914.3 - CPRI over Ethernet mapper/de-mapper
IEEE P1914.1 - Next Generation Fronthaul Interface
IEEE 802.3 - Time Sensitive Network features
IEEE 1588v2 – time stamp
BBU Gateway
TSN MACRoE RX
(Structure Agnostic)
RF(Spectrum Analyzer)
RRH Gateway
L1 OffloadRoE RX(Native)Varying number
of LTE modulated symbols
Control & Management
I
Q
TSN MACRoE TX
(Structure Agnostic)
RoE TX(Native) Varying number
of LTE modulated symbols
Control & Management
CPU baseband processing (ROM
pre-loaded)
Ethernet-based FH
CPRI tester(Sarokal)
CPRI tester(Sarokal)
NGFI (Split 4)
CPRI over Ethernet (Structure Aware)
RF
RoE RX(Structure
Aware)
CPRI tester(Sarokal)
CPRI over Ethernet (Structure Agnostic)
RoE TX(Structure Agnostic)
CPRI tester(Sarokal)
NGFI (Split 4)
CPRI over Ethernet (Structure Aware)
CPRI over Ethernet (Strucutre Agnostic
IEEE 1588v2
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Lab setup
Xilinx VC709 FPGA demonstration platform
CPRI verification by Sarokal X-STEP tester
LTE demondulation verification by Keysight PXA spectrum analyzer
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CPRI over Ethernet - motivation
C-RAN
Bridge to carry current CPRI flows in future Ethernet based fronthaul networks
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CPRI over Ethernet - result
Synchronous traffic over asynchronous networks
Lossless transmission based on the clock recovery and delay control schemes
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Intra-PHY Split Proof of Concept
Source: ”White Paper of Next Generation Fronthaul Interface”
SFP+
SFP+
TSN MAC RoE TxRAM
LTE Data ROM
BBU GEN
LTE Time
TSN MAC RoE Rx L1 DL OffloadRAM
LTE Time
AD9361
Keysight PXA Spectrum Analyzer
I2C
MicroBlaze
AXI GPIO
AXI SPI
AD9361 Digital
interface
FMCOMMS3
Tx1
ctrl
Data interface
RF
122.88 MHz
FMC
Ref clk
Tx FIFO
eth_clk
BBU
RRH
Keysight MXG Signal Generator
10G Ethernet
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PDSCH cell load
PDSCH cell load is dependent on the real traffic for Intra-PHY splits
Downlink shared channel for user data
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Low load in a 10 MHz cell
Succesful cell synchronization
1 user allocated 1 RB (bottom)
Autodetection of cell configuration
Autodetection of user allocation
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Peak load in a 10 MHz cell
Full allocation of user data (PDSCH)
< 1 % EVM
~160 Mbps load on Ethernet link
1:4 reduction compared to CPRI
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Acknowledgement