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Backhauling Small Cells
- 2. Innovation in Mobile Technologies
Small Cells
PDN
GATEWAY
Macro Cell
Evolved
Packet Core
Femto Cells
2
© 2013 ADVA Optical Networking. All rights reserved. Confidential.
- 3. Increasing Coverage and Bandwidth:
LTE and Higher Base Station Density
Step 1: Increase spectral
efficiency e.g. introduce LTE,
higher power Macro Cells, MIMO
Step 2: Add further macro cells
Step 3: Introduce “small cells”:
•
common mobile technology
interference coordination
•
HetNet featuring WiFi offloading
3
© 2013 ADVA Optical Networking. All rights reserved. Confidential.
- 4. Architectural Options
Pool of
Baseband Units
MBH
S1flex
Interface
RBS
RU
RRH
RRH
RRH
BBU
3
RBS
RRH
RRH
RRH
RU
BBU
3
RBS
RRH
RRH
RRH
RU
BBU
MBH
S1flex
Interface
CPRI Interface
Fronthaul Network
X2 Interface
Conventional Base Stations
•
Time/Phase accuracy < 1.5µs
•
Inter-RBS delay < 1ms
•
Inter-RBS bandwidth: moderate
Spectral efficiency: moderate
4
3
BBU
BBU
BBU
BBU
BBU
BBU
BBU
BBU
BBU
BBU
BBU
BBU
Remote Radio Head Solution
•
Digitized RF Baseband -> Line rates
at 1…10Gbit/s -> fiber
•
Stringent delay/ jitter requirements
-> distances up to 40km
Spectral efficiency: high
© 2013 ADVA Optical Networking. All rights reserved. Confidential.
- 5. Emerging Backhaul Architecture
Edge Router/
Security Gateway
BBU
BBU
BBU
BBU
BBU
BBU
BBU
BBU
BBU
Fronthaul Network
Pool of
Baseband Units
Transparent optical transmission
Backhaul Network
IP connectivity over EPLs/EVLANs
any mobile technology
Time/Phase synchronization
Lowest delay/jitter
Scalability
Scalability
Security
Reduced site cost: CAPEX, OPEX
Automated provisioning/activation
5
© 2013 ADVA Optical Networking. All rights reserved. Confidential.
- 7. DWDM Requirements
• Single Fiber Working / Dual
Fiber Working
• Configurations for 1…8
channels per antenna site
• Chains, stars, rings
• Optical performance and
fiber integrity assurance
• Minimize active cell site
components
• Photonic resilience
7
© 2013 ADVA Optical Networking. All rights reserved. Confidential.
- 8. Emerging Backhaul Architecture
Edge Router/
Security Gateway
BBU
BBU
BBU
BBU
BBU
BBU
BBU
BBU
BBU
Fronthaul Network
Pool of
Baseband Units
Transparent optical transmission
Backhaul Network
IP connectivity over EPLs/EVLANs
any mobile technology
Time/Phase synchronization
Lowest delay/jitter
Scalability
Scalability
Security
Reduced site cost: CAPEX, OPEX
Automated provisioning/activation
8
© 2013 ADVA Optical Networking. All rights reserved. Confidential.
- 9. Phase Synchronization Enablement #1
Sync Probe
GPS
Antenna
BBU
Slave Clocks
RBS
RU
PTP Grandmaster
BBU
GPS
Antenna
Sync Probe / Mini GM
•
•
Sync Probe
Mini GM
9
•
PTP traffic
Assessment of PTP Performance
Boundary clock providing superior
clock recovery algorithm
Fallback with PTP Grandmaster
© 2013 ADVA Optical Networking. All rights reserved. Confidential.
- 10. Phase Synchronization Enablement #2
Sync Probe
Mini GM
BBU
Slave Clocks
RBS
RU
PTP Grandmaster
BBU
Sync Probe
Mini GM
•
Sync Probe
Mini GM
Transparency
•
Reducing number of hops by
transparent transport
Side effect: adds network capacity
Time
10
© 2013 ADVA Optical Networking. All rights reserved. Confidential.
- 11. Phase Synchronization Enablement #3
Sync Probe
Mini GM
Co-located BC/TC
BBU
Slave Clocks
RBS
RU
PTP Grandmaster
BBU
Sync Probe
Mini GM
Sync Probe
Mini GM
Co-located BC/TC
TransIntelligent
parency complement
• Complement with co-located
BC/TC featuring SyncJack
• Sync performance management
Time
11
© 2013 ADVA Optical Networking. All rights reserved. Confidential.
- 12. Seamless Synchronization Deployment
Syncjack™ service assurance
Sync Portal
Sync Map
Sync Quality
Sync Path
• Toolbox for synchronization
delivery and assurance
•
•
•
Performance assessment of
network and/or RBS Slave Clock
IEEE1588 PTP slave/boundary
clock
Passive tapping, active probing
and testing mode
• Superior timing recovery
algorithm with fallback to Mini
Grand Master
Syncprobe
• Upgrading non-1588v2 enabled networks
• End-to-end synchronization
network management platform
• Tapping & parallel deployment modes
• Complete Syncjack™ implementation
12
© 2013 ADVA Optical Networking. All rights reserved. Confidential.
- 14. Are you in sync? Let`s do a
sync game at our booth!
ukohn@advaoptical.com
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