Transcript Standard Interface For Satellite IP Networks

STANDARD INTERFACE FOR
SATELLITE IP NETWORKS
E. Laborde
Hughes Network Systems, Inc.
Germantown, MD 20876
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HUGHES PROPRIETARY II
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
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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
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Satellite Access Network Issues
• There are a number of issues related to IP satellite
access networks:
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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
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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.
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DIRECWAY Network Architecture
User Segment
Space Segment
LAN
Interface
Self-hosted
Remote
Terminal
User PC
Ku-band
Transponders
Hub Segment
Network
Mgmt
Center
Backend
Systems
Satellite
Interface
Satellite
Interface
Hub Earth Station
Terrestrial
Interface
PC-hosted
Remote
Terminal
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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
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Protocol Reference Model
Applications
External
Layers
UDP
TCP
Other
IPV4 / IPV6
Satellite
Independent
Satellite Independent Adaptation Functions
SI-SAP
Satellite Dependent Adaptation Functions
Satellite
Dependent
Satellite Link Control (SLC)
Satellite Medium Access Control (SMAC)
Satellite Physical (SPHY)
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IPoS Protocol Model
Traffic
Procedures
Control
Procedures
SLC
Traffic
SLC
Control
MAC
Traffic
MAC
Control
Channel
Selection
Inroute
Processing
Inroute
Carrier
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UPPER
LAYERS
Control
Procedures
Traffic
Procedures
DLC LAYER
M
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MAC
Control
MAC
Traffic
System
Information
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PHYSICAL LAYER
IPoS Logical
Channels
Demultiplexer
Outroute
Processing
Outroute
Carrier
HUGHES PROPRIETARY II
Outroute MAC Encapsulation
D a ta g ra m
MAC PDU
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D a ta g ra m
C
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T ra n s p o rt
P a c k e ts
S tu ffin g
MPEG
D a ta g ra m b yte s
H eader
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b yte s
HUGHES PROPRIETARY II
Inroute Framing Structure
360 msec
Superframe
1
2
45 msec
0
Frame
1
2
3
4
5
6
7
45 msec
Slot
0
1
Burst Length (variable depending on resource allocation)
Burst
Number of slots per frame defined in table 3.5.4.1-1
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Burst structures are defined in table 3.5.5.2.2-1 through table 3.5.5.2.6-1
HUGHES PROPRIETARY II
Inroute MAC Encapsulation
IP D atagram
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F ragm ent
F ragm ent
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F ragm ent
MAC PDU
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P ayload
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P hysical Layer B urst
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In ro ute
T D M A F ra m e
S lo ts
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G -25815 V 04/29/03
T
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B urst P ayload
1
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HUGHES PROPRIETARY II
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:
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Ka-band ODU
Inroute higher transmission rates of 0.5 and 1.0 Msps
DVD-S2 compatible outroute
Adaptive coding and modulation (ACM)
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