Date post: | 05-Dec-2014 |
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Ulrich Kohn – Director Technical Marketing
LTE World Summit 2014
AnyCell Connectivity Supporting any Mobile Radio Technology
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3GPP Radio Interface Innovation
From 2G trough 4G and beyond …
QoS Management
More Spectrum
Air Interface Evolution
Carrier Aggregation
Spectrum Re-Use
Interference Coordination
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AnyCell™ Connectivity
Evolved Packet Core Macro Cell
Small Cell
Small Cell (RRH)
Macro Cell Hub Site
Small Cell (RRH)
Backhaul and fronthaul efficiency for radio access networks
Managed Fronthaul Connectivity
Assured Time/Phase Synchronization
Agenda:
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Application Radio Interface Backhaul
Frequency Phase Frequency Phase
CDMA 2000 ±50ppb ±3 to 10µs GPS GPS
GSM ±50ppb n/a ±16ppb n/a
WCDMA ±50ppb n/a ±16ppb n/a
LTE (FDD) ±50ppb n/a ±16ppb n/a
LTE (TDD) ±50ppb ±1.5µs ±16ppb ±1.1µs
LTE-A MBSFN ±50ppb ±1 to 5µs ±16ppb ±1.1µs
LTE-A CoMP ±50ppb ±1 to 5µs ±16ppb ±1.1µs
LTE-A eICIC ±50ppb ±1 to 5µs ±16ppb ±1.1µs
Mobile Backhaul Synchronization Needs
new new
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Network-based timing distribution
• ITU-T Synchronous Ethernet: Good long-term solution for hop-by-hop frequency distribution
• IEEE 1588v2 – Precision Time Protocol: Favored solution for combined frequency & phase alignment
GNSS-based synchronization
• GPS or GLONASS: Global coverage with availability challenges
Combination required to meet precision and availability targets
IEEE 1588
GPS/ GNSS
SyncE
RAN Synchronization Options
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Synchronization Delivery Challenges
Jitter, wander and asymmetric delay are causing timing error
Frequency Synchronization
Time/Phase Synchronization
Delay Asymmetry
Packet Delay Variation
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• Antennas must have line-of-sight to multiple satellites
• Easy to jam both maliciously and unintentionally
• Interference caused by weather conditions
• Reflections at tall buildings in urban canyons
Challenges with GNSS
Availability issues plus high deployment and maintenance cost
Radio Base Station
GNSS
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• Frequency holdover to within 16ppb for 72 hours is practical
• Rubidium or dual-oven quartz technology
• No oscillator technology will achieve the required holdover performance of ±1µs over 72 hours
• Rubidium clock will hold ±1µs for 8 hours
• PRTC-quality Cesium clock will hold ±1µs for one day
• ±1µs over 72 hours equals approximately 0.004ppb
Holdover Boundary Conditions
Need to constantly track a reference for time protection
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1588v2 PTP Frequency Synchronization
Over-the-top implementation across non-sync-aware backhaul
T-GM
GNSS
PRTC
PTP Grandmaster
PTP Slave Clock
Packet-Based Backhaul Network
T-SC
Radio Base Station
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1588v2 PTP for Phase Synchronization
Lacking end-to-end control of delay asymmetry in the network
T-GM
GNSS
PRTC
PTP Grandmaster
PTP Slave Clock
Packet-Based Backhaul Network
T-SC
Radio Base Station
Each network element needs to be PTP-aware (T-BC)
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Combined APTS and mini-GM Deployment
Efficient and highly available synchronization of radio base stations
T-GM
GNSS
PRTC
PTP Grandmaster
Packet-Based Backhaul Network
APTS mini-GM
Local Base Station
GNSS
Remote Base Station
T-SC
T-SC
T-SC
T-SC
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Visibility Across the Entire Network
Monitoring the performance of the synchronization infrastructure
T-GM
GNSS
PRTC
PTP Grandmaster
APTS mini-GM Probe
Local Base Station
GNSS
Remote Base Station
T-SC
T-SC
T-SC
T-SC
End-to-End Measurement of Delay Asymmetry
Remote Slave Clock
Testing
Local Slave Clock
Testing
Packet-Based Backhaul Network
Self-Calibration and Clock Validation
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• Precise and robust delivery of phase synchronization
• Combining grandmaster with network- based synchronization distribution
• Suitable for network upgrade and greenfield applications
• Synchronization delivery and most advanced assurance functions
OSA 5410 FSP 150SP-100
APTS and mini-GM in a Single Device
Simplifying the evolution to TD-LTE and LTE-Advanced
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From Remote Radio Head to Cloud-RAN
RRH
RRH
RRH
BBU
RRH
RRH
BBU
RRH EPC
CPRI
CPRI
S1
S1
X2
RRH
RRH
RRH
RRH
RRH
RRH EPC
CPRI
CPRI
S1
X2
BBU Pool
Centralizing control for improved flexibility and efficiency
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• Benefits
• Tight interference and spectrum coordination
• Highest spectral efficiency
• Phase synchronization of RRHs not required
• Small footprint and simple deployment
• Challenges
• Low-latency, high bandwidth connection
• CPRI needs to be transported over fiber
• Limited reach
• WiFi small cells not supported by CPRI standard
Centralized vs. Distributed BBUs
Fronthaul and backhaul will co-exist for RAN interconnection
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Passive DWDM for Fronthaul Connectivity
Challenge: passive DWDM lacks ability to assure service integrity
RRH
RRH
RRH
RRH RRH RRH
Small Cell Small Cell Small Cell Macro Cell
Centralized BBU Pool
FSP 3000 ALM
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Access Link Monitoring (ALM)
Access Link Monitoring (ALM) is designed for intelligent passive optical multiplexing
• Clear demarcation of fiber infrastructure to the rest of the equipment through use of a probe reflector
• Simplified root cause analysis as ALM supervises the health of the fiber infrastructure
• Simple integration into NMS by north-bound interface
CPE Device
Access Fiber Link
Probe In/Out Probe Reflect
CO Device
Reflecta
nce
1x
Measurement Principle
Distance
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OptojackTM Fronthaul Monitoring
Non-intrusive fiber monitoring and optical service assurance
RRH
RRH
RRH
RRH RRH RRH
Small Cell Small Cell Small Cell Macro Cell
Centralized BBU Pool
FSP 3000 ALM
FSP Service Manager
Probe Reflect
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Why ADVA Optical Networking?
Fronthaul Network
Active and passive solutions for managing
connectivity
Comprehensive Portfolio
Synchronisation DWDM
Carrier Ethernet Assurance
Synchronization Enablement
Different needs even with same network ask for
versatile solution
ADVA Optical Networks protects your investment and paves the way to higher network performance
Thank You
IMPORTANT NOTICE
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