1. AeroMACS QOS

2. Contents QOS concepts Applications & QOS mapping Device Classes
AeroMACS QOS
IP – QOS
Diffserv Concepts
Applications & QOS mapping
Device Classes
Device Identification & Provisioning

3. AeroMACS service flows
Type of Service
Features
Applications
Unsolicited Grant Service (UGS)
Periodic B/W of equal size allocated as per the request made during connection establishment.
No dynamic negotiations possible
Less B/W management overheads
Suitable for real-time traffic of fixed data length at periodic intervals
Examples: Voice, T1/E1 service, VOIP etc., Critical sensor traffic
Real-time Polling Service (rtPS)
Periodic B/W negotiation opportunities are provided and B/W size is negotiated at every opportunity
SS provided with uni-cast request opportunities.
SS can request for variable data size when the opportunity is available.
Suitable for real-time with variable data sizes or critical applications that requires guaranteed service
Examples: MPEG Video Streams, Periodic Broadcasts like ADS-B/TIS-B , Air Traffic Control messages,
Non Real-Time Polling Service nrtPS
Suitable for non real-time traffic
BS typically polls SS in regular basis with intervals of 1 sec or lesser ( Minimum Guaranteed) .
SS can use contention based request for bandwidth allocation
Suitable for non-real-time lesser critical applications.
Example : File transfer , AOC applications
Best Effort
Suitable for general low priority traffic which does not require any guaranteed service level
Example : Web Browsing , Mail transfer

4. IP- Quality Of Service
Re assigned for Diffserv
However TOS is not generally implemented. Instead reassigned to Diffserv (RFC 2474) . IPv4 & IPv6 use Diffserv definitions.

5. Diffserv concepts
Diffserv is used to classify and mark the packets so that packets are treated with different QOS . TOS bits of IP header is redefined for Diffserv
Expedited Forwarding (EF)
Low delay, Low Jitter & Low Loss
Assured Forwarding (AF)
BW assured for this traffic
Packet drop precedence can be defined within this class.
Default (BE)
Generic traffic with best effort transmission
AF packet drop precedence definition
Assured Forwarding (AF) Behavior Group
Class 1
Class 2
Class 3
Class 4
Low Drop
AF11 (DSCP 10)
AF21 (DSCP 18)
AF31 (DSCP 26)
AF41 (DSCP 34)
Med Drop
AF12 (DSCP 12)
AF22 (DSCP 20)
AF32 (DSCP 28)
AF42 (DSCP 36)
High Drop
AF13 (DSCP 14)
AF23 (DSCP 22)
AF33 (DSCP 30)
AF43 (DSCP 38)

6. ATN-IPS QOS Model
Applications Mark IP packets (Set DSCP bits) depending upon the criticality .
TOS – in case of IP v4 &
Traffic Class - in case of v6
Radios shall map IP Level Diffserv QOS to their MAC level QOS
AC End Systems
Air- Ground Network
Aircraft Network
Datalink
Radios
Ground Station
Ground Network
AC End Systems
Network prioritizes packets depending upon the DSCP settings
All network components Handle packets as per Diffser settings

7. Message Priority Definitions
Priority Mapping as per 9896
Class of Service
IP Drop
ATN Priority
Applications
Very High (EF)
Voice
High (AF) 1 2 3
ADS-C, CPDLC
Normal (AF) 4
AIDC, FIS, ATIS 5
METAR 6
CM(DLIC) 7
8 to 14
Best Effort (BE)
ICAO Recommended Practices
COCR RTCP Requirements
Delay in Secs
Applications
0.13
ATC-VOICE
0.4
AOC-VOICE
1.2
SURV, WAKE 3
ACC,ACM, DLL, D_RVR 5
D-ATIS, D-FLIP,D-ALERT,D-TAXI, D-SIGMAT 8 10
D-SIG, PPD 30
AOC-High 60
AOC-low

8. Eurocontrol AeroMACS Manual
CoS
Scheduling
QoS paremeters values in the AeroMACS service flows
Traffic priority
Maximum Sustained Traffic Rate (kbps)
Minimum Reserved Traffic Rate (kbps)
Maximum Latency (s)
Voice
ertPS
N/A
DL/UL: 64
64*
DL/UL: 0.150
NET
rtPS
DL/UL: 34 32
DL/UL: 1
ATS1 1
DL/UL: 1.5
ATS2 2
ATS3
nrtPS
AOC1
DL: 67
UL: 134
DL: 64
UL: 128
AOC2 BE
DL: (8100 – x A/C)/2
UL: (3300 – x A/C)/2
APT1
DL: 1000
APT2

9. Service Flow and QOS Mapping
AeroMACS supports Classification rules based on DSCP
CoS
Scheduling
IP QOS
Traffic priority
PHB
DSCP bits
Voice
ertPS (UGS)
N/A EF
101110
NET
rtPS
AF31
011010
ATS1 1
AF32
011100
ATS2 2
AF33
011110
Emergency Video
AF23
010XXX
ATS3
nrtPS
AF11
001010,
AOC1
AF13
001110
AOC2 BE DF
000000
APT1
APT2
Newly Added which is used for emergency purpose only.
Normal video will be treated as “Best Efforts)
AF4X , AF21, AF22, AF12 are reserved for future traffic categories

10. Default Supported by all devices
Device Classes
CoS
Scheduling
IP QOS
Aircarft
Surface Vehicle
Video Sensors
Ground Crtical
Ground Default
Traffic priority
PHB
Voice
ertPS
N/A EF X
NET
rtPS
AF31
ATS1 1
AF32
ATS2 2
AF33
Video (E)
AF23
ATS3
nrtPS
AF11, AF12 x
AOC1
AF13
AOC2 BE DF
Default Supported by all devices
APT1
APT2
Considering the RTCP requirements, Is it possible to reduce the number of Service flows.

11. Device Type Identification
“tbsCertificate.subject” shall be used to distinguish different types of certificates
During Logon AAA server identifies the device type and based on user profile provisions the set of service flows
Certificates have device Type Identified
AAA
tbsCertificate.subject : <Device Type><Id>
ASN
AeroMACS CPE
ASN / BS configured to support all service flows identified

12. Thank You