Upload
dangkhue
View
225
Download
1
Embed Size (px)
Citation preview
Telecom Infra Event March 2015
Ulrich Müller
Deploying and managing new
cell sites with FTTA- RFoFiber Interference Test
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 2
Introduction to Distributed Cell Sites
RFoCPRITM Technology Overview
Topics
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 3
Radio
Coaxial
Feeder
Antennas
Base Band Unit
BBU
Fiber
Feeder
(CPRI)
Antennas
Remote
Radio Head
RRH
BackhaulBackhaul
Distributed Cell SitesIntroduction to Distributed Cell Sites (CPRI/Fiber)
Conventional Cell Site Distributed Cell Site
Cell Sites with coaxial
feeders:
Advantages: + RF access from the radio
for interference analysis
and conformance testing
Disadvantages:- High Loss
- Signal Reflections
- Passive Intermodulation
(PIM)
Cell Sites with fiber
feeders:
Advantages: + Minimal signal loss
+ Minimal signal reflections
+ Minimal passive
intermodulation (PIM)
Disadvantages:- RF access from the RRH
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 4
Distributed Cell SiteInterference Analysis
RF access at Remote Radio Heads
Long Resolution Time (Tower Climb)
High Maintenance Cost
Safety Concerns
Spectrum Analysis
Remote Radio Head
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 5
CPRI Topology Scenarios
Distributed Cell SitesTopologies
Chain
Tree
RRU
BBU Bank
𝐶𝑃𝑅𝐼
𝐹𝑖𝑏𝑒𝑟
RRURRU
RRU
RRU RRU
C-Ran
RRU
RRU
RRU
RRU RRU RRU
RRU RRU
BBU Bank
𝐶𝑃𝑅𝐼
𝐹𝑖𝑏𝑒𝑟
DAS
Span
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 6
Introduction to Distributed Cell Sites
RFoCPRITM Technology Overview
Topics
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 7
CPRI is an industry cooperation defining a specification for the interface between the Radio Equipment Control (REC) or BBU and the Radio Equipment (RE) or RRU.
• Three different information flows (User Plane data, Control and Management Plane data, and Synchronization Plane data) are multiplexed over the interface.
CPRI Technology OverviewInformation Flows
Control and Management Plane: The control data flow used for call processing and management data is for the operation, administration and maintenance of the CPRI link and its nodes.
Synchronization Plane: Data flow which transfers frame and time alignment information between nodes.
User Plane: user plane data is transported in the form of IQ data flows which reflects the data of one antenna for one carrier, the so-called antenna-carrier (AxC).
Radio Equipment Control
(REC)
Radio Equipment
(RE)
LAYER 2
LAYER 1
LAYER 2
LAYER 1
CPRICTRL & MGMT
PLANE
SYNC
PLANE
USER
PLANE
CTRL & MGMT
PLANE
SYNC
PLANE
USER
PLANE
BackhaulAntennas
BBU RRU
Backhaul
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 8
BBU
Channel coding, interleaving and
modulation.
MIMO processing.
Tx power control.
Slot and frame generation.
RRU
Digital/Analog conversion.
Frequency up-conversion.
Carrier multiplexing.
Power amplification.
RF filtering.
LTE Downlink Signal Processing
CPRI Technology OverviewLTE Downlink Signal Processing of BBU and RRU
Power
Frequency0 Hz
Power
Frequency751 MHz
AmplificationFiltering
CPRI
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 9
RRU
Frequency down-conversion.
Automatic gain control.
Carrier de-multiplexing.
RF filtering.
Analog/Digital conversion.
BBU
Channel decoding, de-
interleaving, demodulation.
MIMO processing.
Transmit power control.
Signal distribution for processing.
LTE Uplink Signal Processing
CPRI Technology OverviewLTE Uplink Signal Processing of BBU and RRU
Power
Frequency782 MHz
Power
Frequency0 Hz
Amplification Filtering
CPRI
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 10
RFoCPRI Technology OverviewArchitecture
SFP-A
SFP-BEthernet
Cable &
Antenna
Analysis
RF-InSFP
Port 2 SFP
Port-1
RFoCPRITM Option Board
I/O Interface
ClientHost
DC 12–19V
Cable and Antenna Analyzer
+25dBm MAX, 50VDC MAX
RF In 50Ω
Spectrum Analyzer
Reflection /
RF Out 50ΩRF In 50Ω
USB
LAN Port 2
+25dBm MAX
50VDC MAX
GPS Trigger Ref
External In10/100/1000 Port 1
Cable & Antenna
Analysis
Amplifier/Filter
Insertion G/L
GPS Positioning
Sync & Timing
Fiber Inspection
I/O Interface
RFoCPRI
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 11
Optical power level > -20dBm
RFoCPRI Technology Optical Power and Fiber Inspection
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 12
RFoCPRI TechnologyCPRI Monitoring
BBUBBU
α β γ
α β γ
(Sectors)
(Sectors)
Optical Coupler
α β γ (Sectors)
Coupled
CPRI link
RFoCPRITM
Standard Cell Site Deployment Cell Site with CPRI Monitoring
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 13
RFoCPRI Technology OverviewFiber Connection
In Service
ClientHost
18 VDC
Cable and Antenna Analyzer
+25dBm MAX, 50VDC MAX
RF In 50Ω
Spectrum Analyzer
Reflection /
RF Out 50ΩRF In 50Ω
Port 2
SFP/SFP+
+25dBm MAX
50VDC MAX
GPS Trigger Ref
External In
10/100/1000
Port 1
SFP/SFP+
RXTXRE
TXRXREC UL
CouplingDL
Coupling
Three-Channel Optical nTAP
Out of Service
ClientHost
18 VDC
Cable and Antenna Analyzer
+25dBm MAX, 50VDC MAX
RF In 50Ω
Spectrum Analyzer
Reflection /
RF Out 50ΩRF In 50Ω
Port 2
SFP/SFP+
+25dBm MAX
50VDC MAX
GPS Trigger Ref
External In
10/100/1000
Port 1
SFP/SFP+
RXTXRRH
TX RX
Three-Channel Optical nTAP
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 14
RFoCPRITM Spectrum Analysis LTE Uplink 10 MHz
Spectrogram Spectrum Replay
RFoCPRI Technology OverviewLTE Uplink Signal Processing of BBU and RRU
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 15
RfoCPRI Technology Overview
RFoCPRITM Spectrum Analysis LTE Uplink 10 MHz
Spectrogram Spectrum Replay
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 16
RFoCPRI Technology Overview
Dual Spectrum Measurement screen
• Monitor Antenna0 and Antenna1 simultaneously.
* Two spectrum should be in the same CPRI link
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 17
RFoCPRI Technology Overview
Dual Spectrogram Measurement screen
• Monitor Ant0 and Ant1 (MIMO) simultaneously.
* Two spectrum should be in the same CPRI link
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 18
RFoCPRI Technology Overview
RF Source with RFoCPRI
Mode
RFoFiber
RFoCPRI
RFoOBSAI
Layer 2 Monitoring
Layer 2 Term
Interference Analyzer
PIM Detection
Measure
Spectrum
Spectrogram
RSSI
Spectrum Replayer
Fronthaul
RF/Coaxial
RRH
IQ Spectrum
CW Signal Injection
Application• Uplink noise floor calibration at a given point• Uplink gain / dynamic range check• AxC configuration checkMeasurement modes that
support RF source function
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 19
RFoCPRI Technology OverviewUplink PIM Detection
CellAdvisor JD785B
RFoCPRI
Copper
Fiber
Optical
Splitter
FIBER RX
Uplink Spectrogram
RRU
BBU
Phase Line Rate
Mbps
Word Size
bits
CPRI
Frames
1228.8 16 2
2457.6 32 4
3072.0 40 5
4915.2 64 8
6144.0 80 10
9830.4 128 16
IQ UPLINK DEMAPPER
ELECTRICAL
IQ
VE
ND
OR
ET
H
TDM
HD
LC
L1
Inband
USER
PLANE
CONTROL
PLANESYNC
OPTICAL
© 2014 JDS Uniphase Corporation | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 20
RFoCPRI Technology OverviewPassive Intermodulation
Spectrum (Ant. 1 & 2) Spectrogram (Ant.1)
Thank you!More info at:
Fomax Test & Connectivity B.V.
Versterkerstraat 3b
1322 AN Almere
036-7601023
06-55894451
[email protected]:1. Common Public Radio Interface (CPRI); Interface
Specification V6.
2. Remote Radio Unit Description by Ericsson.
3. JDSU CellAdvisor JD785B.