cellular backhauling over satellite: the other side of the coin
TRANSCRIPT
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
Page 5
~4.400 MNOs
MNOs Worldwide
Page 6
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
Page 13
Lesson learned: the more sites accessing the channel (n),the more gain from statistical multiplexing (g)
Satellite Outbound
Page 14
SKYWAN Outbound
Page 15
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
Page 18
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
Page 19
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
Page 21
Network Architecture - GSM
Network Architecture - GSM
Page 22
Network Architecture - GSM
Page 23
Network Architecture - UMTS
Page 24
Network Architecture - LTE
Page 25
Legacy HUB Topology - Star
Page 26
SKYWAN Topology - Flexible
Page 27
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 | Page 35 |
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
Page 38
Local Switching with SKYWAN
Page 39
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
Page 41
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