hughes proprietary ii1hns-31689 10/23/2015 standard interface for satellite ip networks e. laborde...

HUGHES PROPRIETARY II1HNS-31689 04/20/23

STANDARD INTERFACE FOR SATELLITE IP NETWORKS

E. Laborde

Hughes Network Systems, Inc.

Germantown, MD 20876


IPoS Standardization in TIA

• Work on the standardization of DIRECWAY® started August 2002 with the creation of a Working Group within the Satellite Communications Division of the Telecommunications Industry Association (TIA)

• The development of the standard was completed in August 2003 under the name IP over Satellite (IPoS)

• The IPoS ballot period ended October 8, 2003 – The IPoS standard was approved for publication without

any negative votes

• IPoS was published by TIA on November 23, 2003 as the TIA-1008 standard


Broadband Access

• Broadband Internet is one of the most commercially successful services offered by telecom operators today

• In general end-to-end IP services are provided to the user by a hierarchy of networks that includes:– An access network

– A metropolitan network

– The core, or backbone network

• Several broadband access networks have evolved for providing mainly IP services to the user:– DSL

– Cable modem

– Satellite


Satellite Access Network Issues

• There are a number of issues related to IP satellite access networks:– Sharing the large investment in satellite resources

– Exploiting the temporal fluctuations of traffic demands

– Exploiting the asymmetry of satellite services

– Exploiting the tolerance of IP services to delay

– Provision of a secure environment

– Transparency to higher protocol layers to avoid changes to the user host and Internet routers

– Support of transmission rates comparable to those provided by competing technologies

– Affordable and easy-to-use solutions


IPoS Air Interface

• IPoS is the air interface between the remote terminals and the hub in the DIRECWAY satellite access network with a star, hub-and-spoke, topology. The elements in the DIRECWAY network are:– The hub segment consisting of the gateway

interconnecting the satellite access network with the external networks, e.g., Internet, corporate, or private packet networks.

– The space segment typically consists of commercial Ku‑band, bent‑pipe transponders on geosynchronous satellites, allowing transmission in both directions between the gateway and remote terminals.

– The user segment is responsible for interfacing the user hosts or Personal Computers (PC) running the user applications at the customer premises.


DIRECWAY Network Architecture

Self-hostedRemoteTerminal

PC-hostedRemoteTerminal

Ku-bandTransponders

Hub Earth Station

Network MgmtCenter

BackendSystems

User PC

Space SegmentUser Segment Hub Segment

LANInterface

TerrestrialInterface

SatelliteInterface

SatelliteInterface


IPoS Technical Characteristics

• The IPoS standard defines the interface between remote terminals and gateway; it includes the following features:– A clear separation of satellite-dependent and independent

functions that enables the easy deployment of new applications

– An architectural framework structured into three specific planes: user, control, and management

– A layered protocol stack that separates physical (modulation, coding,..), logical (addressing, MAC headers,..), and procedures (bandwidth allocation, security,..)

– Two directions of transmission:• The outroute direction from the hub to the remote terminals• The inroute direction from the remotes to the hub


Protocol Reference Model

SatelliteDependent

SatelliteIndependent

Satellite Link Control (SLC)

Satellite Physical (SPHY)

SI-SAP

ExternalLayers

IPV4 / IPV6

UDP TCP

Satellite Medium Access Control (SMAC)

Other

Satellite Independent Adaptation Functions

Satellite Dependent Adaptation Functions

Applications


IPoS Protocol Model

ChannelSelection

Demultiplexer

TrafficProcedures

ControlProcedures

Management

Entity

PHYSICAL LAYER

DLC LAYER

InrouteCarrier

OutrouteCarrier

MACControl

SLCTraffic

TrafficProcedures

ControlProcedures

InrouteProcessing

OutrouteProcessing

MACControl

MACTraffic

MACTraffic

SLCControl

IPoS LogicalChannels

SystemInformation

UPPERLAYERS


Outroute MAC Encapsulation

M P E G

H e a d e rD a ta g ra m b yte s

D a ta g ra m

D a ta g ra mCRC

Header

M A C P D U

T ra n sp o rtP a c k e ts

S tu ffin g

b yte s


Inroute Framing Structure

0 1 2 3 4 5 6 7

0 1

1 2Superframe

Frame

Slot

Burst

360 msec

45 msec

Number of slots per frame defined in table 3.5.4.1-1

Burst structures are defined in table 3.5.5.2.2-1 through table 3.5.5.2.6-1

45 msec

Burst Length (variable depending on resource allocation)

G-25974 V06/09/03


Inroute MAC Encapsulation

IP Datagram

Fragment

PayloadCRC

Header

FragmentFragment

Header

MAC PDU

Burst Payload

Trailer

Header

Header

Header

Adaptation

InrouteTDMA Frame

Slots

1 N

Physical Layer Burst

G-25815 V 04/29/03


IPoS Evolution

• The IPoS standard will evolve beyond its current version 01. New versions will incorporate the attributes that are part of the evolution of DIRECWAY:– Ka-band ODU

– Inroute higher transmission rates of 0.5 and 1.0 Msps

– DVD-S2 compatible outroute

– Adaptive coding and modulation (ACM)

hughes proprietary ii1hns-31689 10/23/2015 standard interface for satellite ip networks e. laborde...

Documents