Split Options for 5G Radio Access Networks. Paul Arnold, Nico Bayer, Jakob Belschner, Gerd Zimmermann Technology Innovation Deutsche Telekom AG
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1 Split Options for 5G Radio Access Networks Paul Arnold, Nico Bayer, Jakob Belschner, Gerd Zimmermann Technology Innovation Deutsche Telekom AG
2 Introduction Two splits envisioned in the 5G RAN Control-Plane / User-Plane Split CU/DU -Split (Central and Distributed Units)
3 Central and Distributed Units
4 Central and Distributed Units Centralization of parts of the processing in a central unit Motivation: Simplified implementation of interference coordination, multiconnectivity, traffic-steering, Several options to split the protocol stack, each with different demand on the underlying interface (xhaul) Flexibility to implement centralization in different deployments Split Options in the Protocol Stack
5 xhaul data rate in Gbit/s xhaul data rate in Gbit/s Examples for data rate requirements on the xhaul interface 12,0 10,0 8,0 6,0 LTE 2 antenna ports / 2 layers 4 antenna ports / 4 layers 8 antenna ports / 8 layers 10000,0 1000,0 100,0 Potential 5G Air Interfaces LTE 20 MHz 5G AIV (< 6 GHz / 100 MHz) 5G AIV (> 6 GHz / 400 MHz) 4,0 10,0 2,0 0, GPP Split Option 1,0 0, GPP Split Option
6 Control-Plane / User-Plane Split
7 Control-Plane / User-Plane Split Categorize network functions into Control-Plane (CP) and User-Plane (UP) functions Define standardized interfaces for interaction between CP and UP Pros Consistent control over network elements from different vendors Avoid replacement of UP in case CP is modified More flexible network Cons Tight coupling of CP / UP Full separation might be complex Standardization for all interfaces is required Additional effort in terms of testing
8 PDCP RLC (asynch.) RLC (synch.) MAC High (DeMUX) MAC Low (HARQ) FEC Decoding Descrambling Layer Demapping Demodulation Equalization Analog RF Combining PDCP RLC (asynch.) RLC (synch.) MAC High (MUX) MAC Low (HARQ) FEC Coding Scrambling Modulation Layer Mapping Digital Beamforming Analog Beamforming (RF Precoding) Interactions between CP and UP 3GPP Split Option Downlink User 8 Plane S1-U* Resource Element Mapping & IFFT D/A Conversion Antenna #1 Resource Element Mapping & IFFT D/A Conversion Antenna #N S1-C* X2-C* RRC Cell Config ICIC Short-Term Scheduler Control Plane Resource Element Demapping & FFT RU Config A/D Conversion Antenna #1 1: DL Buffer Status 2: Payload Selection 3: Payload Selection, DL Resource Assignment, UL Grants 4: Retransmission Control 5: Broadcast Channel Information 6: Coding Scheme 7: Antenna Mapping, Precoder, Modulation Scheme 8: Reference Symbols, Synchronization Channels 9: Antenna Weights 10: Channel State Information (from UL Sounding) 11: Channel State Information (CQI Reporting), UL Scheduling Request 12: HARQ Status S1-U* Resource Element Demapping & FFT Uplink User Plane A/D Conversion Radio Unit (RU) Antenna #M
9 Overall Network Architecture
10 Proposed Overall Network Architecture Forwarding of data in the transport network through based on SDN Implements CP/UP split Central Access Controller (CAC) is the centralized network element in Radio Access Network Separated into CP and UP part xhaul-interface to the radio sites Flexible adaptation depending on the network deployment
11 PDCP (incl. Fast Switch or Packet Duplication) Common Higher CP QoS / Slice Control Multi-Cell/-AIV Resource Mapping Lower CP AIV 1 RRC Lower CP AIV 2 QoS / Slice Enforcement PDCP (incl. Fast Switch or Packet Duplication) Use Case: Multi-Connectivity Multi-Connectivity is important in 5G, especially for: mmwave Radio Ultra-Reliable Communication Figure shows potential implementation based on CU / DU split option 2 S1-C* S1-U* Central Unit (CU) Distributed Unit (DU) Cell Config RLC RLC 1 2 Downlink User Plane MAC MAC 3 4 PHY PHY RU RU AIV 2 AIV 1 Additional CP functions for: Short-Term Scheduler Traffic Steering (Multi-Cell / Multi- AIV Resource Mapping) Quality of Service Network Slicing RLC 12 MAC 11 PHY 10 RU AIV 1 S1-U* RLC MAC PHY RU AIV 2 2 Uplink User Plane
12 Summary and Conclusions
13 Summary and Conclusions Two split options under discussion for 5G Central and distributed unit ( CU/DU split ) Control-Plane / User-Plane split CU/DU split Important for multi-connectivity, interference coordination, traffic-steering Split at lower layers can lead to extremely high data rates on the interface Control-Plane / User-Plane split Important for flexible future networks and consistent control functions Tight coupling in the RAN make full separation complex
14 Thank You
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