Open RAN & Ericsson Jan Willem Wallenburg Ericsson Telecommunicatie B.V. KIVI - 11 mei 2021
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Open RAN & Ericsson
Jan Willem Wallenburg
Ericsson Telecommunicatie B.V.
KIVI - 11 mei 2021
| 2021-05-11 | Open | Page 1 of 16
Agenda 1. Today’s RAN & 3GPP 2. Open RAN & 3GPP 3. Open RAN & Ericsson 4. Fronthaul & Lower-Layer Split 5. Higher-Layer Split 6. Virtualization & generic HW | 2021-05-11 | Open | Page 2 of 16
RAN today
Standard and multivendor interfaces
Vendor RAN
Management
Antenna
Mobile Radio Baseband Core
Device Unit Fronthaul Unit Network
(CPRI)
Transport
Proprietary RAN HW & SW - internal RAN interfaces from same vendor
Standard and multivendor interfaces with mobile device and core network
| 2021-05-11 | Open | Page 3 of 16
3GPP – Key end-user benefits
Affordability Fast time to
market
Mobile Unparalleled
broadband global diffusion
4G and 5G have been very successful 3GPP innovations
Success is based on open standards and multi-vendor networks
| 2021-05-11 | Open | Page 4 of 16Key elements of Open RAN
Open RAN is not a standard but an industrial concept
Key elements of Open RAN
HW & SW Intelligence Open internal
virtualization and automation RAN interfaces
RAN application as VNFs (virtual RAN) Open Management & Orchestration Higher-layer split
White-label HW (Digital and Radio) Use external AI/ML capabilities Lower-layer split (Open Fronthaul)
O-RAN Alliance specifications build on 3GPP standards, as an approach to realize Open RAN concepts
The current main-stream pilot approach to realize Open RAN concepts consist of proprietary solutions
| 2021-05-11 | Open | Page 5 of 16Open RAN ambition
Open Management and Orchestration
O1 A1
CU-CP High
Front E2
F1-C
haul CU-CP Low
Mobile Radio Digital Radio Control Core
Device Unit Unit E1 Network
F1-U
CU-UP
White label Generic Packet Cloud infra (NFVI)
Radio HW Aggregation
Digital HW Generic HW
Lower-Layer Split Higher-Layer Split
White label HW (RU and DU)
All interfaces are open, further stack fragmentation (E2)
Use Open Source SW
| 2021-05-11 | Open | Page 6 of 16Open RAN ambition
Open Management and Orchestration
O1 A1
Central Unit (CU)
Distributed Unit (DU)
CU-CP
Front F1-C Radio Control
Mobile Radio haul Digital Core
Device Unit Unit E1 Network
F1-U
CU-UP
Specialized Specialized Packet Cloud infra (NFVI)
Radio HW Aggregation
Digital HW Generic HW
Higher-Layer Split
RU/DU remain specialized - CU on generic HW, CU SW as VNF
F1, E1 interfaces multi-vendor - O1, A1 management interfaces open
Ericsson & O-RAN: participation in 5 Work Groups, support for 8 of the 10 interfaces
| 2021-05-11 | Open | Page 7 of 16RAN control loops
A1-O1 loop
E1-F1 loop
DU-RU loop
| 2021-05-11 | Open | Page 8 of 16Evolution to fronthaul
Beamforming
5G Massive MIMO
Antenna Antenna Antenna Antenna
2T2R Integrated 32T32R
1T2R 1T2R
Tower 4T4R Radio 64T64R
Mounted (AIR)
Thin coax Thin coax
Amplifier RRU
cable cable
Tower-mounted Remote Radio Unit Antenna and RRU
amplifers/boosters (RRU) in tower combined
Thick coax Coax cable
cable (RF) Digital Packet
(RF)
fronthaul fronthaul
(CPRI) (eCPRI)
RU RU
DU DU DU DU
fiber fiber
5G radio innovation requires advanced fronthaul
| 2021-05-11 | Open | Page 9 of 16Lower-layer split options
O-RAN LLS architecture option: Ericsson LLS architecture option:
• More functions in the distributed unit. • More functions in the radio unit.
• Limits the complexity of the radio unit. • Custom silicon for higher radio complexity: low power
• Reduced radio performance with M-MIMO. consumption and weight, high computation power.
• Optimal radio performance with M-MIMO.
Fiber
Fiber
Fronthaul
Fronthaul
Position of lower-layer split is a key design choice
| 2021-05-11 | Open | Page 10 of 16Benefits of Ericsson LLS - examples
Breaking the energy curve: switch off TX for sleep mode @ 0.1 ms Superior performance: 10x cell edge speed, +10 dB range
Uplink throughput [Mbps]
Energy consumption
4G
3G
2G
5G Time Signal strength
5G + innovation = higher energy efficiency
Security: DU-RU authentication/encryption, signed SW, secure boot Advanced functionality: 4G/5G spectrum sharing @ 1 ms
1ms
Frequency
4G 5G Time
| 2021-05-11 | Open | Page 11 of 16Typical European network topology
Data center Cloud infra (NFVI) Low-band: 6 GHz
Generic HW
“Any” backhaul
Aggregation level
DU+CU DU+CU
Custom HW Custom HW
Aggregate
in DU 5G mid-band
5G low-band
4G low-band
Uniform site grid: efficient aggregation in DU
| 2021-05-11 | Open | Page 12 of 16vCU first RAN element on generic HW
Data center Cloud infra (NFVI) Low-band: 6 GHz
Generic HW
Higher Layer Split
Data center Cloud infra (NFVI)
vCU
Generic HW Aggregation level
Low latency
Fiber backhaul
DU DU
Custom HW Custom HW
DU
Custom HW
DU
Aggregate
Custom HW in vCU 5G mid-band
5G high-band DU DU
Custom HW Custom HW 5G low-band
4G low-band
5G high-band
Different site grids: higher-layer split for aggregation in vCU on generic HW
| 2021-05-11 | Open | Page 13 of 16High processing needs in 5G DU
5G drives exponential increase Digital front-end processing
in processing needs Beamforming processing
• # Antenna branches growing with Massive MIMO Layer 1 processing
• More carrier bandwidth at higher frequencies Layer 2 processing
• Wider spectrum allocations in new bands Packet processing function
• Shorter transmission time interval (TTI) Radio control function
Carrier bandwidth 20 MHz 20 MHz 100 MHz 100 MHz 100 MHz
Antenna branches 2T2R 4T4R 4T4R 8T8R 64T64R
Transmission Time Interval (TTI) 1 ms 1 ms 0.5 ms 0.5 ms 0.5 ms
5G DU will remain on specialized HW for several years
| 2021-05-11 | Open | Page 14 of 16RAN options for the future
Networks for the future
Ericsson
Cloud Distributed Unit …
RAN Market readiness: Technical evaluations Trials
Central Unit …
Market readiness: Technical evaluations Trials Commercial Deployment
Unified cloud infrastructure Vendor agnostic Cross domain Scalability for a wide range of
for Core, RAN and Edge RAN HW innovation use-cases/deployment scenarios
Ericsson
Custom
Silicon
…
Single standard HW Multi standard HW Mixed mode HW 5G Optimized HW
Highest performance Pre-integrated E2E accountability and State-of-the-art RAN features
per watt and size and E2E tested performance guarantees with extreme HW requirements
DU+CU on specialized HW as main-stream, vCU first on generic HW, vDU at later stage
| 2021-05-11 | Open | Page 15 of 16You can also read
