cellular backhauling over satellite: the other side of the coin

Cellular Backhauling over SatelliteThe Other Side of the Coin

Robert Novak, 28 February 2017

Satellite Backhauling as Seen by Mobile Op‘s

High Delay

Low Throughput

Expensive

Agenda

Efficient

High Quality

Flexible

Future Proof

~4.400 MNOs

MNOs Worldwide

Example from the Mediterranean

Statistical Multiplexing

...to efficiently transport traffic sources that alternate between bursts of transmission activity and periods of no activity.- Kavitha Chandra, Center for Advanced Computation and Telecommunications University of Massachusetts at Lowell, Massachusetts

Statistical multiplexing is a key concept in data networks because traffic is bursty- Key Concepts in Networking, University of Washington online course

Bursty Traffic

How to Handle Bursty Traffic

How to Handle Bursty Traffic – cont‘d

// Capacity is assigned to Cells that really need Bandwidth //

A cell gets assigned CIR plus extra pool capacity shared by all cells. Unused CIR of one cell is immediately available to other cells.

The total network traffic capacity is split in multiple TDMA carriers Cascading of MF-TDMA carriers multiplies bandwidth

Microwave Example

150 Mb/s150 Mb/s

150M b/s

BH=450 Mb/s ?

BH=n x avg x g

BH=3 x 90 x 0,9

BH=243 Mb/s

BH = Backhaul Capacityn = number of linksavg = average link utilizationg = gain factor

BH=243 Mb/s (1,85:1 overbooking)

BH=20 x 90 x 0,3

BH=540 Mb/s

BH=540 Mb/s (5,5:1 overbooking)

Statistical Multiplexing – Key Message

Lesson learned: the more sites accessing the channel (n),the more gain from statistical multiplexing (g)

Satellite Outbound

SKYWAN Outbound

Satellite Inbound

BH=n x avg x g

BH=8 x 9,6 x 0,8

BH=61,44 Mb/s

∑BH=61,44*6=368,64 Mb/s

Overbooking 2:1

48 remotes networkremote max=16 Mb/sremote avg=9,6 Mb/sRequired SCPC Capacity: 768 Mb/s

SKYWAN Inbound

BH=n x avg x g

BH=48 x 9,6 x 0,25

∑BH=115,2 Mb/s

Overbooking 6,7:1

48 remotes networkremote max=16 Mb/sremote avg=9,6 Mb/sRequired SCPC Capacity: 768 Mb/s

Total Cost of Ownership

SCPC Legacy HUB SKYWAN Inputs HUB Number of remotes 48HUB Price $336.000 $300.000 $21.600 Max capacity per remote (Mb/s) 16

Total $300.000 $300.000 $50.000 Avg capacity per remote (Mb/s) 9,6Total capacity Max (Mb/s) 768

Remotes Total capacity Avg (Mb/s) 460,81 Remote price $7.000 $1.000 $6.500 Price per MHz $3.000

48 Remotes price $300.000 $48.000 $300.000 Mb/s Required SCPC 768

CapEx MHz Required SCPC 256

$600.000 $348.000 $350.000 Mb/s Required Legacy HUB 368,64MHz Required Legacy HUB 122,88

OpEx Mb/s Required SKYWAN 115,2

Monthly OpEx $768.000 $368.640 $137.583 MHz Required SKYWAN 45,861

TCO TCO Year 1 $9.816.000 $4.771.680 $2.000.996TCO Year 2 $19.032.000 $9.195.360 $3.651.992TCO Year 3 $28.248.000 $13.619.040 $5.302.988TCO Year 4 $37.464.000 $18.042.720 $6.953.984TCO Year 5 $46.680.000 $22.466.400 $8.604.980

The Real Pay as you Grow

TCO Year 1 TCO Year 2 TCO Year 3 TCO Year 4 TCO Year 5$0

$5,000,000

$10,000,000

$15,000,000

$20,000,000

$25,000,000

$30,000,000

$35,000,000

$40,000,000

$45,000,000

$50,000,000

SCPCLegacy HUBSKYWAN

Agenda

Efficient

High Quality

Flexible

Future Proof

Network Architecture - GSM

Network Architecture - UMTS

Network Architecture - LTE

Legacy HUB Topology - Star

SKYWAN Topology - Flexible

Use Cases

Use Cases – cont‘d

Agenda

Efficient

High Quality

Flexible

Future Proof

High Quality

MOS: 4.0

Jitter: 4ms

OCXO ± 0.001ppm

Agenda

Efficient

High Quality

Flexible

Future Proof

Small Cells

Open BTS

02.05.2023 | |

Software Defined Core Network

Vodafone Foundation Instant Network

Core Network – where to put it?

BSS / NSS

USRP

Skywan 5G

BSS / NSS

USRP

Skywan 5G

BSS / NSS

USRP

Skywan 5G

BSS / NSS

USRP

Skywan 5G

Local Switching – Impossible with Legacy HUB

Local Switching with SKYWAN

Local Switching OpEx

Legacy HUB:(0,02 x 62,6) x 2 + (0,9 x 62,6) x 4 = 227,9 Mb/s

SKYWAN:(0,02 x 62,6) x 2 + (0,9 x 62,6) x 2 = 115,2 Mb/s

= 76 MHz

= 45,8 MHz

SKYWAN 5G

The Intelligence is in each single modemNo external equipment necessary for operation

Increased throughput just by adding/combining units

The ideal modem for Cellular Backhauling

cellular backhauling over satellite: the other side of the coin

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