C-RAN is just another form of Small Cell. The main C-RAN challenge is fronthaul. But fronthaul makes it difficult to reach RRU locations (mostly urban...
C-RAN is just another form of Small Cell. The main C-RAN challenge is fronthaul. But fronthaul makes it difficult to reach RRU locations (mostly urban), is dependent of non-traditional deployments ...
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Centralized RAN (C-RAN) WHAT IS IT? AND WHY SHOULD YOU CARE? Paul Kennard, CTO June 13, 2013
THE DATA STORM LOW ARPU
NETWORK COSTS
NEW DEVICES
NEW CONSUMERS
low or stable average revenue per user
explosion of smart phones, tablets and other mobile devices
increased network CAPEX and OPEX
5 billion consumers will have access to internet
AVIAT NETWORKS
DENSER NETWORKS
the only way to deal with the data storm is to have denser wireless networks with ever increasing spectral efficiency
This has several problems: How
to meet the required coverage and capacity?
How
to deal with interference?
How
to manage increased complexity:
To
increase spectral efficiency?
To
manage customer’s data?
To
deal with higher CAPEX and OPEX?
AVIAT NETWORKS
STRATEGIES FOR DENSER NETWORKS BACKHAUL
RAN DECENTRALIZATION (HetNet) TRADITIONAL MACRO CELLS SMALL CELLS, SON
FRONTHAUL
RAN CENTRALIZATION (C-RAN) DISTRIBUTED ANTENNAS (DAS) REMOTE RADIO HEADS (RRH)
OFFLOAD
WiFi OFFLOAD
AVIAT NETWORKS
CENTRALIZED RAN (C-RAN) TERMINOLOGY
AVIAT NETWORKS
C-RAN IMPLEMENTATION JUST ANOTHER FORM OF SMALL CELL
TRADITIONAL MACRO CELL DEPLOYMENT
CELL SPLIT USING FRONT HAUL
Source: NGMN
AVIAT NETWORKS
ADVANTAGES OF C-RAN
Resource pooling
Greener infrastructure (re-use)
Base station virtualization
Simplified management and operation
Coordination for interference mitigation (ICIC)
Multi technology support
No GPS in each remote site
AVIAT NETWORKS
MAIN C-RAN CHALLENGE IS FRONTHAUL
Difficult to reach RRU locations (mostly urban)
Non traditional deployments (street furniture, non-tower)
CPRI interface creates new challenges (capacity, latency, management, etc) PLUS FIBER IS NOT EVERYWHERE, AND NOT FOR FREE… SO WIRELESS SOLUTIONS FOR FRONTHAUL WILL BE NEEDED
AVIAT NETWORKS
BUT CAPACITY AND LATENCY REQUIREMENTS PUSH THE BOUNDARIES OF WIRELESS TECHNOLOGIES
RRH CPRI
“Latency”
RRH CPRI
<100us
BBU
TRANSMISSION MEDIUM (FIBER / MICROWAVE)
CPRI
IP BACKHAUL
WCDMA
COMPRESSED CPRI CAPACITY REQUIREMENTS
CORE
LTE
SCENARIO
5 MHz
10 MHz
20 MHz
3 Sectors, 4x4 MIMO, 1 Carrier
369 Mbps
2.9 Gbps
5.9 Gbps
1 Sectors, 2x2 MIMO, 1 Carrier
98 Mbps
461 Mbps
983 Mbps
AVIAT NETWORKS
WHICH MEANS NEW INNOVATIONS (IN WIRELESS TRANSPORT) WILL BE REQUIRED smaller
lower latency
higher capacity
faster
low power
cheaper AVIAT NETWORKS
C-RAN offers many benefits for operators however Fronthaul challenges need to be addressed to make it a reality
