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Master’s Thesis Seminar. Backhaul Transport Technologies for Broadband Wireless Access. Pasi Kolkkala 2.11.2009. Introduction. Main infrastructure for mobile backhaul has been TDM (E1, PDH microwave, etc.) Good for speech but bad for packet data

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Presentation Transcript
introduction
Introduction
  • Main infrastructure for mobile backhaul has been TDM (E1, PDH microwave, etc.)
    • Good for speech but bad for packet data
  • HSPA & LTE require much more capacity from backhaul (some say up to 1 Gbps!)
  • Complexity of available options
  • Packet based backhaul
objectives of this thesis
Objectives of this Thesis
  • Compare various physical media based on their capacity and reach
  • Apply provider bridging Carrier Ethernet on a backhaul network
  • Construct a step-by-step technology selection process
transmission technologies for backhaul
Transmission technologiesfor backhaul
  • Synchronous transport
    • PDH, SDH, Next Generation SDH
      • OTN, GFP, VCAT, LCAS
transmission technologies for backhaul1
Transmission technologiesfor backhaul
  • PON (Passive Optical Network)
    • APON, BPON, EPON, GPON, …
  • Packet based RAN
transmission technologies for backhaul2

850 nm optical signal loss due to weather (note the logarithmic scale)

dB loss/km

100

Relative transmission distance

10

15 m

65 m

190 m

400 m

1 km

2 km

4 km

17 km

40 km

1

0.1

Densefog

Thickfog

Moderatefog

Lightfog

Thinfog

Heavyrain

Moderaterain

Lightrain

Drizzle

Veryclear

Transmission technologiesfor backhaul
  • Wireless transmission
    • Microwave (adaptive modulation, mm-wave)
    • Free Space Optical (line-of-sight operation)
transmission technologies for backhaul3
Transmission technologiesfor backhaul
  • How about native Ethernet?
    • Ethernet in the First Mile
    • VDSL2, enhanced SHDSL
    • Aggregation of multiple pairs

200

150

Mbps

100

50

0

500

1000

1500

Distance (m)

Downlink transmission

Uplink transmission

carrier ethernet
Carrier Ethernet
  • Metro Ethernet Forum
  • Pseudowires
  • MPLS
  • Provider bridging
    • Q-in-Q
    • MAC-in-MAC
    • PBB-TE
  • GMPLS for path provisioning
backhaul designer toolbox
Backhaul designer toolbox
  • Hybrid backhaul
  • Partially meshed networks
  • Synchronization over Ethernet
selection of optimal backhaul questions
Selection of optimal backhaul Questions
  • What is the currently needed amount of capacity for this backhaul?
  • What is the distance to the nearest fibre network point-of-presence?
  • How much scalability is expected from the backhaul in the future?
  • What level of reliability is required from the backhaul connection?
  • How soon is the upgraded backhaul deployment expected to be completed?
  • What level of resource sharing is going to be done with other operators (base station tower, backhaul link, radio access network)?
  • Is interoperability with existing SDH based OAM systems crucial?
  • Is the quality of available synchronization over Ethernetsolutions sufficient?
selection of optimal backhaul physical medium selection
Selection of optimal backhaul Physical medium selection

Copper

FSO

Microwave

Fiber

Transport capacity

Fair

Good

Good

Excellent

Transmission distance

Low

Low

Good

Excellent

Data rate scalability

Fair

Good*

Good*

Excellent

Reliability

Fair

Low

Fair

Excellent

Completion schedule

Very fast

Fast

Fast

Slow

* Wireless transmission is seeing fast paced development which promises good scalability for the future

selection of optimal backhaul transport technology selection

SDH switching

Carrier Ethernet

Interoperability with existing management systems

Very good in case large existing MSPP install base

Low, may need separate management systems

Support for network synchronization

Inherently good and proven

Under standardization and still unproven

Support for complex Ethernet switched networks

Low, although this depends on specific vendor systems

High, depends largely on the level of personnel competence

Operation expertise compared to circuit switched networks

Similar, only evolutionary new features of NG-SDH (OTN, VCAT, LCAS, ...)

Different, requires packet switching knowhow(except for PBB-TE)

Selection of optimal backhaul Transport technology selection
conclusions
Conclusions
  • Fiber, enhanced microwave, FSO and VDSL2 provide needed bandwidth
  • Optimal solution is the result of
    • Interoperability between different vendors
    • Low cost future upgrades of hardware
    • Price negotiations, etc…
  • SDH still has it’s place in future backhaul
  • Ethernet evolution makes it a valid option in the near future
    • With a lower cost than SDH