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Everything you need to know about 5G xHaul

Nov 02, 2020

Even the current pandemic can’t seem to stop the rush to 5G. Between November 2019 and October 2020 worldwide commercial deployments went from 1,200 to nearly 16,000. The completion of 3GPP’s 5G New Radio (NR) Release-16 earlier this summer marked a milestone as it addresses capabilities beyond Enhanced Mobile Broadband (eMBB) including support for unlicensed spectrum, industrial IoT and automotive applications, and integrated access and backhaul (IAB).

In a new white paper released by RAD, we take a look at some newly introduced 5G concepts, including the disaggregation of the gNB and the transition from backhaul into xHaul (including fronthaul, midhaul and backhaul), and what they mean for mobile operators, network wholesalers and transport providers – both from technological and business aspects.

Disaggregating the 5G base station’s functionality, for example, has several economic and operational benefits:

  • Flexibility and modularity to better fit various use cases with different requirements (topology, latency, capacity, density, space availability, etc.)
  • Simplified engineering of the radio site and reduction of its space and power requirements
  • Better coordination for efficient use of radio resources and performance features
  • Facilitating use of NFV and SDN technologies and migration to vRAN/cRAN

                                       5G Functional Splits and xHaul

It’s interesting to note that the 3GPP standards tend to consider transport as a trivial function that effortlessly delivers data over the named interfaces with no latency, availability failures, synchronization glitches, or other degradation. Alas, even well-engineered transport networks have limitations and occasionally fail to live up to design requirements.

New RAN Requirements and the Essential CSG Checklist

Driven by new use cases (with highly distributed content and applications) and an innovative RAN architecture that mandates new transport attributes, 5G xHaul is fundamentally different from conventional 4G mobile backhaul.  The new requirements include higher data-rates, lower latency and packet loss; higher reliability; hard isolation of network slices; and dynamic connectivity for on-demand services encompassing multiple physical and virtual components. Other factors impacting the transport network include virtualization and edge computing, and network slicing. The following table summarizes some of the key requirements. These are likely to evolve as new standard releases become available:

xHaul Needs

Transport Network Requirements

High capacity

High speed connections (nx10G, nx25G, 100G)

Densification

High speed connectivity for an increased number of nodes

Prompt on-demand connectivity

Dynamic traffic steering for network and inter-site connectivity, dynamic function instantiation

Service separation for multiple use cases and customers

Support for CoSes and hard isolation for end-to-end slicing

URLLC support

Support new transport technologies (e.g., TSN, DetNet) and architectures/functional splits for low delay and high reliability assurance

New Cloud RAN topology

High speed and stringent latency requirements to enable various C-RAN/D-RAN deployments

Virtual RAN and MEC support

Edge Computing infrastructure (distributed NFVI)

Service and network automation

Integration with SDN controllers and service and network orchestrator(s), zero-touch provisioning

The interested reader can find out more in the newly published book 5G Radio Access Network Architecture: The Dark Side of 5G, especially the chapter on the new transport network, which was authored by RAD.

A key enabler for CSPs to meet such requirements is the cell site gateway (CSG), but 5G deployments require re-defining the functionality of the CSG. The 5G-ready CSG performs aggregation of multiple traffic types originating in the cell, including 4G, 5G sub 6 GHz (FR1), 5G mmWaves (FR2), small cell transit traffic, WiFi hot spot backhauling, etc. The CSG is responsible for homogenizing traffic across generations and technologies, minimizing transport expenses (including energy efficiency and multiplexing/duplexing in order to minimize fiber count), constructing a single frequency and time-of-day reference clock, providing a cell-wide heart-beat to ensure connectivity to the cell and all its components, and initiating fail-over self-healing procedures as needed. It may additionally incorporate a micro-data center platform for edge computation.

In our white paper, we further present a CSG buyer’s checklist to ensure efficient 5G deployments and support for highly distributed content and applications with multiple classes of service for various end-to-end 5G slices. We also offer our view for an effective migration path to 5G to satisfy the engineering and financial challenges faced by mobile operators.

You are welcome to read the full document here. Read on here to learn more on RAD’s 5G xHaul solutions.

Nothing can be done to stop the rush to 5G – are you up to speed?

 

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