Abstract
Due to the complexity of space environment and the difficulty of satellite maintenance in outer space, survivability has become one of the most important problems of LEO satellite constellation. Network survivability is the ability of a system to complete communication missions in case of encountering accidents, failures or attacks. A survivable LEO satellite constellation can guarantee a certain mission success rate when some satellites fail, but the completed performance depends on the architecture designed, resources owned and route adopted by the satellite constellation. The existing satellite network survivability evaluation methods can not accurately describe the impact of constellation design parameters, limited resources and access algorithm on survivability. To overcome the above shortcomings, this paper proposes a new survivability assessment model with resource constraints. We exploit the queue graphical evaluation and review technology random network with feedback to characterize resource limitations and describe the dynamic random mission transfer process of LEO satellite constellation. Based on the time, jitter and consumed resources produced by different link arc activities when completing missions, combined with queuing birth and death technology, we derive the mission cost and network utility function, aiming at reflecting the completion ability of LEO satellite constellation for communication mission after facing fault or strike. The results show that increasing the orbit height does not significantly improve the network survivability; rerouting load balancing access strategy can better share the mission of failed satellite; LEO satellite constellation has weak survivability towards GCF; user retry after mission failure will aggravate delay.
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Abbreviations
- LEO:
-
Low earth orbit
- MEO:
-
Medium earth orbit
- GEO:
-
Geostationary earth orbit
- UDL:
-
User data link
- ISL:
-
Inter-satellite link
- DTN:
-
Delay tolerance network
- Q-GERT:
-
Queue graphical evaluation and review technique
- RA:
-
Random attack
- SIA:
-
Structure importance attack
- GCF:
-
Geographically correlated failures
- OA:
-
Orbital attack
- S, U, \(\upsilon\) :
-
The set of LEO satellites, users and all nodes
- s i, \(s_{i}^{\prime}\) :
-
Receiver and transmitter of Si
- u i, \(u_{i}^{\prime}\) :
-
User receiving end and sending end of Ui
- \(\lambda_{{a_{h} ,i,j}}\) :
-
Mission arrival rate between source user ui and destination user uj in the ah hour
- \(\left( {\upsilon_{i} ,\upsilon_{j} } \right)\) :
-
Activity from node vi to node vj
- \(W_{{usii^{\prime} }}\) :
-
Transfer function of up UDL activity \(\left( {u_{i} ,s_{i}^{\prime} } \right)\)
- \(W_{{suii^{\prime} }}\) :
-
Transfer function of down UDL activity \(\left( {s_{i} ,u_{i}^{\prime} } \right)\)
- \(W_{{ssij^{\prime} }}\) :
-
Transfer function of ISL between si and \(s_{j}^{\prime}\)
- \(W_{{ssi^{\prime} i}}\) :
-
Transfer function of processing activity \(\left( {s_{i}^{\prime} ,s_{i} } \right)\)
- \(W_{uii}\) :
-
Transfer functions of up UDL feedback
- \(W_{suji}\) :
-
Transfer functions of down UDL feedback
- \(W_{suii}\) :
-
Transfer function of ISL feedback
- \(M_{i,j} \left( s \right)\) :
-
Cost moment generating function of \(\left( {\upsilon_{i} ,\upsilon_{j} } \right)\)
- \(M_{{d_{i,j} }} \left( s \right)\) :
-
Delay moment generating function of \(\left( {\upsilon_{i} ,\upsilon_{j} } \right)\)
- \(M_{{e_{i,j} }} \left( s \right)\) :
-
Energy moment generating function of \(\left( {\upsilon_{i} ,\upsilon_{j} } \right)\)
- λ ui , λ sui, λ ri, λ ssi :
-
Packet arrival rate of satellite Si’s up UDL, down UDL, receiver si and ISL sender
- m 1 ,m 2 :
-
Channel number of UDL and ISL
- B s :
-
Buffer size of satellite
- μ us , μ su, μ ss , μ sp :
-
Service rate of up UDL, down UDL, ISL and satellite processor
- P us, P su, P sr, P ss , P sp, P o :
-
Power of up UDL, down UDL, receive ISL, send ISL and nominal operation
- α :
-
Failure arrival rate of LEO satellite
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Funding
This work was supported in part by the National Natural Science Foundation of China under Grant 71671091, in part by the National Development and Reform Commission under Grant HighTech[2017]1069.
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Nie, Y., Fang, Z. & Gao, S. Q-GERT survivability assessment of LEO satellite constellation. Wireless Netw 27, 249–268 (2021). https://doi.org/10.1007/s11276-020-02452-7
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DOI: https://doi.org/10.1007/s11276-020-02452-7