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Geosynchronous Network Grid Addressing for Integrated - - PowerPoint PPT Presentation

NIPAA Program The 28th IEEE International Conference on Network Protocols (ICNP 2020) Geosynchronous Network Grid Addressing for Integrated Space-Terrestrial Networks Gao Zheng, Ning Wang, Rahim Tafazolli Xinpeng Wei 5GIC, University of


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NIPAA Program Madrid, Spain, October 13, 2020

Gao Zheng, Ning Wang, Rahim Tafazolli

Geosynchronous Network Grid Addressing for Integrated Space-Terrestrial Networks

{g.zheng, n.wang, r.tafazolli}@Surrey.ac.uk 5GIC, University of Surrey, Guildford, Surrey, UK

Xinpeng Wei

weixinpeng@huawei.com Huawei Technologies Co.,Ltd. Beijing, China

The 28th IEEE International Conference on Network Protocols (ICNP 2020)

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Geosynchronous Network Grid Addressing for Integrated Space-Terrestrial Networks

Outline

Background The Geosynchronous Network Grid Addressing scheme Performance eveluation

  • The basic idea.
  • Design details.
  • Networking with the GNGA scheme.

Conclusion

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SLIDE 3

Background

  • Networking with Low Earth Orbit (LEO)

satellites has received increasing attentions in recent years.

Space-Terrestrial network integration The Key challenge

  • Satellite-terrestrial routing stability

problem.

Recent attempts

  • Satellite as an independent network.
  • Satellite as the access network.
  • Satellite as the transit network.

different subnets

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SLIDE 4

The Geosynchronous Network Grid Addressing scheme

The Goal

  • Seamlessly integrate the space and terrestrial

networks based on a unified common IP infrastructure.

  • Without introducing severe routing stabilises

caused by the LEO satellite constellation behaviours.

  • Especially considering the legacy routing

infrastructure on the terrestrial network side.

  • Implementation friendly.
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  • Divide the space into grids.

The basic idea

  • The grids are designed to be

geosynchronous.

  • Each grid is by logic a virtual router.

The advantages

  • The virtual routers (i.e.,the grids) are static

to the ground stations.

  • Topology dynamic is hided from layer 3.

The Geosynchronous Network Grid Addressing scheme

  • The virtual routers are consecutively

instantiated by the passing-by satellites.

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  • Use geographic coordinates to divide the

grids.

Design details

  • IP addresses are bound to the grids instead
  • f the satellites.
  • Each ground stations talks to a fixed

piece of sky above it.

The Geosynchronous Network Grid Addressing scheme

  • The IP function of a GNG is consecutively

instantiated by the passing-by satellites.

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  • The configuration is GNG-based.

Instantiating the GNGs with satellites

  • A satellite would need to activate the right

configuration before it enters a grid.

The Geosynchronous Network Grid Addressing scheme

  • The configuration includes e.g., IP

addresses, BGP settings. Mac address mapping

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SLIDE 8
  • A satellite will need to periodically shift its

setting during a mission.

Setting coordination

The Geosynchronous Network Grid Addressing scheme

  • The two configuration shifting options.
  • 1. Active shifting
  • 2. Passive shifting

[1A-A-A-A]

Satellite direction Grid_1

IP_1.1 IP_2.1 IP_3.1

Grid_3 Grid_2 Time line

IP_1.1 <—> [1A-A-A-A]

Advertise the ARP mapping:

12:00 13:00 14:00 IP_2.1 <—> [1A-A-A-A] IP_3.1 <—> [1A-A-A-A] C1 C2 C3 C1 C2 C3

Using GTS information is also an option Passing on the knowledge

C1 C2 C3

Grid_1 Grid_2 Grid_3 Satellite direction

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SLIDE 9

Networking with GNGs

The Geosynchronous Network Grid Addressing scheme

IP_1.0 IP_10.0 IP_4.0

[BB] [1A] [2A] [3A] [4A]

Des Nhop L2 ad x.0 10.2 [2B] 5.0 3.2 [2A] Des Nhop L2 ad x.0 3.1 [1A] 5.0 4.2 [4A] Des Nhop L2 ad x.0 4.1 [3A] 5.0 5.1 [51] IP_3.0 IP_5.1

[51]

Des Nhop L2 ad x.0 0.1 [11] 5.0 1.2 [BB]

[2B] [11]

IP_x.1

Destination_L2 Source_L2 Destination_IP Source_IP Data [3A] [4A] x.1 5.1 Data

An example of the packets:

  • Use IP for routing.
  • Use satellite address for

switching.

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Basic setups

Performance eveluation

Conf_1 S_2 S_3 Conf_2 Conf_3

Static Routing OSPF eBGP: 14.0.0.1

  • IGPs are redistributed into BGP.

S_1

  • configuration shifting option: active

shifting. GNG_1

eBGP: 14.0.0.2

GNG_3

  • Two handover Types

Terrestrial Network Space Network Smooth: make before break Hard: break before make The address/protocol configurations are made proactively.

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Performance eveluation

Network connectivity performance

  • Connectivity being 1 means the space/

terrestrial network can perform normal communication with each other.

  • Hard handover:

BGP-straightforward approach would require approximate 30 seconds to converge. GNGA can recover instantly after the handover event.

  • Smooth handover:

GNGA is seamless. BGP-straightforward approach would have a 10-seconds path switching time.

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Performance eveluation

Impact to the space/terrestrial system

  • For GNGA, handovers will not trigger prefix

updates propagating into both the space and terrestrial infrastructure.

  • For the BGP-straightforward approach,

smooth handover can circumvent the convergence issue but will cause more impact to both sides.

With hard handovers: The numbers of update entries propagated into ground/space are 9 and 97. With smooth handover: The numbers of update entries propagated into ground/space are 105 and 150.

  • For BGP straightforward scheme:
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Conclusion

GNG is a competitive solution for Space- Terrestrial network integration.

  • 1. Topology dynamic is hided from the IP

layer.

  • 2. The network connectivity performance

is significantly improved.

  • 3. The integration impact is small to the

existing terrestrial system.

  • 4. All the incremental changes are made

from the space segment, thus it is considered as implementation friendly.

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NIPAA Program Madrid, Spain, October 13, 2020

Gao Zheng

Thank you

g.zheng@Surrey.ac.uk 5GIC, University of Surrey, Guildford, Surrey, UK

The 28th IEEE International Conference on Network Protocols (ICNP 2020)