1HONEYWELL - CONFIDENTIAL File Number AeroMACS QOS.

1 HONEYWELL - CONFIDENTIAL File Number

AeroMACS QOS


Contents

QOS conceptsAeroMACS QOSIP – QOSDiffserv Concepts

Applications & QOS mapping

Device Classes

Device Identification & Provisioning


AeroMACS service flowsType 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 possibleLess B/W management overheads

Suitable for real-time traffic of fixed data length at periodic intervalsExamples: 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 opportunitySS 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 serviceExamples: 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 trafficBS 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


IP- Quality Of Service

However TOS is not generally implemented. Instead reassigned to Diffserv (RFC 2474) . IPv4 & IPv6 use Diffserv definitions.

Re assigned for Diffserv


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

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)

AF packet drop precedence definition


Air- Ground Network

ATN-IPS QOS Model

AC End Systems

Aircraft Network DatalinkRadios

Ground Network Ground Station

AC End Systems

Applications Mark IP packets (Set DSCP bits) depending upon the criticality . TOS – in case of IP v4 &Traffic Class - in case of v6

Network prioritizes packets depending upon the DSCP settings

Radios shall map IP Level Diffserv QOS to their MAC level QOS

All network components Handle packets as per Diffser settings


Message Priority Definitions

Priority Mapping as per 9896

Class of ServiceIP Drop

ATN Priority Applications

Very High (EF) Voice

High (AF)

1

0 1 2 3 ADS-C, CPDLC

Normal (AF)

1 4 AIDC, FIS, ATIS2 5 METAR

3 6 CM(DLIC)7

8 to 14 Best Effort (BE)

ICAO Recommended Practices

COCR RTCP Requirements

Delay in Secs

Applications

0.13 ATC-VOICE0.4 AOC-VOICE1.2 SURV, WAKE3 ACC,ACM, DLL, D_RVR

5D-ATIS, D-FLIP,D-ALERT,D-TAXI, D-SIGMAT

810 D-SIG, PPD30 AOC-High60 AOC-low


Eurocontrol AeroMACS Manual

CoS Scheduling

QoS paremeters values in the AeroMACS service flows

Traffic priorityMaximum

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 N/A DL/UL: 34 32 DL/UL: 1ATS1 rtPS 1 DL/UL: 34 32 DL/UL: 1.5ATS2 rtPS 2 DL/UL: 34 32 DL/UL: 1.5ATS3 nrtPS N/A DL/UL: 34 32 N/A

AOC1 nrtPS N/ADL: 67

UL: 134

DL: 64

UL: 128N/A

AOC2 BE N/A

DL: (8100 – 0.267 x A/C)/2

UL: (3300 – 0.334 x A/C)/2

N/A N/A

APT1 BE 1 DL: 1000 N/A N/A

APT2 BE 2

DL: (8100 – 0.267 x A/C)/2

UL: (3300 – 0.334 x A/C)/2

N/A N/A


Service Flow and QOS Mapping

Newly Added which is used for emergency

purpose only. Normal video will be

treated as “Best Efforts)

CoS Scheduling

IP QOS

Traffic

priority PHBDSCP bits

Voice ertPS

(UGS) N/A EF 101110

NET rtPS N/A AF31 011010

ATS1 rtPS 1 AF32 011100

ATS2 rtPS 2 AF33 011110Emergency

VideortPS AF23 010XXX

ATS3 nrtPS N/A AF11001010, 001100

AOC1 nrtPS N/A AF13 001110

AOC2 BE N/A DF

000000

APT1 BE N/A

APT2 BE N/A

AeroMACS supports Classification rules based

on DSCP

AF4X , AF21, AF22, AF12 are reserved for future traffic categories


Device Classes

CoS Scheduling IP QOS

AircarftSurface Vehicle

Video Sensors

Ground Crtical

Ground Default

Traffic

priority PHBVoice ertPS N/A EF X X NET rtPS N/A AF31 X X X X XATS1 rtPS 1 AF32 X X X ATS2 rtPS 2 AF33 X

Video (E) rtPS AF23 X

ATS3 nrtPS N/A AF11, AF12 x

AOC1 nrtPS N/A AF13 x AOC2 BE N/A

DF Default Supported by all devices APT1 BE N/A

APT2 BE N/A

Considering the RTCP requirements, Is it possible to reduce the number of Service flows.


Device Type Identification

“tbsCertificate.subject” shall be used to distinguish different types of certificates

AeroMACS CPE

tbsCertificate.subject : <Device Type><Id>

ASN

Certificates have device Type Identified

ASN / BS configured to

support all service flows identified

During Logon AAA server identifies the device type and

based on user profile provisions the set of service flows

AAA


Thank You

1HONEYWELL - CONFIDENTIAL File Number AeroMACS QOS.

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