Overview of AeroMACS QoS Concepts and Diffserv Implementation
This document delves into the Quality of Service (QoS) concepts in AeroMACS, including various service flows and Diffserv implementation for IP QoS. It explores the different types of services like UGS, rtPS, nrtPS, and Best Effort, as well as Diffserv classifications such as EF, AF, and BE. Additionally, it covers the reassignment of QoS for IP using Diffserv and the mapping of DSCP bits. The content further discusses how ATN-IPS models application-specific QoS and prioritization of packets based on criticality in the AeroMACS network architecture.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
You are allowed to download the files provided on this website for personal or commercial use, subject to the condition that they are used lawfully. All files are the property of their respective owners.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.
E N D
Presentation Transcript
AeroMACS QOS 1 HONEYWELL - CONFIDENTIAL File Number
Contents QOS concepts AeroMACS QOS IP QOS Diffserv Concepts Applications & QOS mapping Device Classes Device Identification & Provisioning 2 HONEYWELL - CONFIDENTIAL File Number
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 3 HONEYWELL - CONFIDENTIAL File Number
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. 4 HONEYWELL - CONFIDENTIAL File Number
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) 5 HONEYWELL - CONFIDENTIAL File Number
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 Datalink Radios Aircraft Network Ground Station AC End Systems Ground Network Air- Ground Network Network prioritizes packets depending upon the DSCP settings All network components Handle packets as per Diffser settings 6 HONEYWELL - CONFIDENTIAL File Number
Message Priority Definitions Priority Mapping as per 9896 ICAO Recommended Practices IP Drop ATN Priority Class of Service Very High (EF) Applications Voice 0 1 2 3 4 5 6 7 High (AF) 1 ADS-C, CPDLC AIDC, FIS, ATIS METAR CM(DLIC) 1 2 Normal (AF) 3 8 to 14 Best Effort (BE) COCR RTCP Requirements Delay in Secs 0.13 0.4 1.2 3 Applications ATC-VOICE AOC-VOICE SURV, WAKE ACC,ACM, DLL, D_RVR D-ATIS, D-FLIP,D-ALERT,D- TAXI, D-SIGMAT 5 8 10 30 60 D-SIG, PPD AOC-High AOC-low 7 HONEYWELL - CONFIDENTIAL File Number
Eurocontrol AeroMACS Manual QoS paremeters values in the AeroMACS service flows Maximum Sustained Traffic Rate (kbps) Minimum Reserved Traffic Rate (kbps) CoS Scheduling Maximum Latency (s) Traffic priority Voice ertPS N/A DL/UL: 64 64* DL/UL: 0.150 NET ATS1 ATS2 ATS3 rtPS rtPS rtPS nrtPS N/A 1 2 N/A DL/UL: 34 DL/UL: 34 DL/UL: 34 DL/UL: 34 DL: 67 32 32 32 32 DL/UL: 1 DL/UL: 1.5 DL/UL: 1.5 N/A DL: 64 AOC1 nrtPS N/A N/A UL: 134 UL: 128 DL: (8100 0.267 x A/C)/2 AOC2 BE N/A N/A N/A UL: (3300 0.334 x A/C)/2 DL: 1000 DL: (8100 0.267 x A/C)/2 APT1 BE 1 N/A N/A APT2 BE 2 N/A N/A UL: (3300 0.334 x A/C)/2 8 HONEYWELL - CONFIDENTIAL File Number
Service Flow and QOS Mapping AeroMACS supports Classification rules based on DSCP IP QOS CoS Scheduling Traffic priority DSCP bits PHB ertPS (UGS) rtPS rtPS rtPS Voice N/A Newly Added which is used for emergency purpose only. Normal video will be treated as Best Efforts) EF 101110 NET ATS1 ATS2 Emergency Video ATS3 AOC1 AOC2 APT1 APT2 N/A 1 AF31 AF32 AF33 011010 011100 2 011110 rtPS AF23 010XXX 001010, 001100 nrtPS nrtPS BE BE BE N/A N/A N/A N/A AF11 AF13 001110 AF4X , AF21, AF22, AF12 are reserved for future traffic categories DF N/A 000000 9 HONEYWELL - CONFIDENTIAL File Number
Device Classes IP QOS CoS Scheduling Traffic priorityPHB N/A N/A 1 Surface Vehicle X X X Video Sensors Ground Crtical Ground Default Aircarft X X X X Voice NET ATS1 ATS2 Video (E) ertPS rtPS rtPS rtPS rtPS EF X X X X AF31 AF32 AF33 AF23 AF11, AF12 AF13 2 X ATS3 AOC1 AOC2 APT1 APT2 nrtPS nrtPS BE BE BE N/A N/A N/A N/A x x DF Default Supported by all devices N/A Considering the RTCP requirements, Is it possible to reduce the number of Service flows. 10 HONEYWELL - CONFIDENTIAL File Number
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> AeroMACS CPE ASN ASN / BS configured to support all service flows identified 11 HONEYWELL - CONFIDENTIAL File Number
Thank You 12 HONEYWELL - CONFIDENTIAL File Number
