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Jonathan Notes #5

Main reference: 5G NR Logical Architecture and its Functional Split Options: Your Study Note Hyperlink
Deadline: 11th May 2020

tags: ET6207701

5G New Functional Requirements

5G Enablers and Principles

  • Modularization
  • Network Slicing
  • Network Softwarization
  • Multi-Access Edge Computing (MEC)

5G NR Use Cases

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5G NR Key Aspects

  • Higher frequency operation and spectrum flexibility
  • Ultra-Lean Design
  • Forward Compatibility
  • Duplex Schemes
  • Low-Latency Support

5G Protocol Stack and its Architecture

Network Architecture

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User Plane Protocol Stack

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  • SDAP (Service Data Adaptation Protocol)
    • Mapping between a QoS flow and a data radio bearer (Due to new QoS framework)
    • Marking QoS flow ID (QFI) in both DL and UL packets ( DL: due to reflective QoS and UL: due to new QoS framework)
    • A single protocol entity of SDAP is configured for each individual PDU session, except for DC where two entities can be configured
  • PDCP (Packet Data Convergence Protocol)
    • Sequence Numbering
    • Header compression and decompression: ROHC only
    • Transfer of user data
    • Reordering and Duplicate detection (if order delivery to layers above PDCP is required)
    • PDCP PDU routing (in case of split bearers)
    • Retransmission of PDCP SDUs
    • Ciphering and Deciphering
    • PDCP SDU discard
    • PDCP re-establishment and data recovery for RLC AM
    • Duplication of PDCP PDUs
  • RLC (Radio Link Control)
    • Transfer of upper layer PDUs
    • Sequence numbering independent of the one in PDCP
    • Error Correction through ARQ
    • Segmentation and re-segmentation
    • Reassembly of SDU
    • RLC SDU discard
    • RLC re-establishment
  • Medium Access Control (MAC)
    • Mapping between logical channels and transport channels
    • Multiplexing/demultiplexing of MAC SDUs belonging to one or different logical channels into/from transport blocks (TB) delivered to/from the physical layer on transport channels
    • Scheduling Information Reporting
    • Error correction through HARQ
    • Priority handling between UEs by means of dynamic scheduling
    • Priority handling between logical channels of one UE by means of logical channel prioritization
    • Padding
  • Physical Layer (PHY)
    • Coding/decoding
    • Modulation/demodulation
    • Multi -antenna mapping
    • Mapping transport channels to physical channels
    • and other PHY related functions

5G NR Mapping between Logical, Transport and Physical Channels

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No BCCH in 5G NR

5G QoS Architecture

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  • more granular
  • the radio bearers can be handled independently from the CN
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RRC states

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Transmission Structure

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LTE vs 5G NR

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5G NR Functional Split

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  • Introduction of midhaul provides more flexibility for transport options
  • Control Plane/User Plane split (Vertical split)
  • Central Unit/Distributed Unit split (Horizontal split)
  • Need software based implementation to support the tehnology

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