Research on Wavelength Resource Characteristics of Optical Satellite Network Based on Time-Space Conflict Map

Xin Li; Yongjun Li; Shanghong Zhao; Xiang Wang; Zhiqiang Ma; Rui Hou

doi:10.3788/LOP213343

Laser & Optoelectronics Progress, Volume. 60, Issue 9, 0906002(2023)

Research on Wavelength Resource Characteristics of Optical Satellite Network Based on Time-Space Conflict Map

Xin Li^1、*, Yongjun Li¹, Shanghong Zhao¹, Xiang Wang¹, Zhiqiang Ma¹, and Rui Hou²

¹Teaching and Research Section of Communication System, College of Information and Navigation, Air Force Engineering University, Xi'an 710077, Shaanxi, China

²A Centre of the Ministry of Equipment Development, Beijing 100034, China

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Figures & Tables(17)

Fig. 1. Optical satellite network diagram

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Fig. 2. Optica satellite network topology diagrams with different physical connectivity. (a) $α = 0.5$ ; (b) $α = 0.8$ ; (c) $α = 1$

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Fig. 3. Six node optical satellite network

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Fig. 4. Space and time conflict map models. (a) Space conflict map; (b) time conflict map

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Fig. 5. Wavelength conflict map model

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Fig. 6. Topological structure diagram of Starlink constellation

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Fig. 7. Normalized wavelength requirement distribution. (a) α=0.2; (b) α=0.3; (c) α=0.4; (d) α=0.5

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Fig. 8. Influence of physical connectivity on wavelength requirements

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Fig. 9. Influence of network connectivity on wavelength requirements

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Fig. 10. Influence of maximum hops on wavelength requirements. Maximum number of link hops is (a) 2; (b) 3; (c) 4; (d) 5

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Fig. 11. Influence of number of transponders on wavelength requirements and network connectivity

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Fig. 12. Influence of business overlap factor onwavelength requirements

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Table 1. Topology generation algorithm

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Table 1. Topology generation algorithm

Algorithm 1：topology generation algorithm

Input：number of network nodes N，physical connectivity $α$ ，and range of node degrees $(σ_{m i n}, σ_{m a x})$ .

Output：network topology connection diagram.

1）Calculate potential inter-satellite links referring to Eqs.（2）-（6）；

2）Establish an inter-satellite link through a randomly selected inter-satellite link；

3）If for all nodes， $σ \in (σ_{m i n}, σ_{m a x})$ ：

a）if meeting physical connectivity of network $α$ ；

b）end if.

4）End if.

5）Else go to 2）.

Table 2. Business request situation
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Table 2. Business request situation
Request r S_r d_r $[t_{r}^{s}, t_{r}^{f}]$ h_r
1 1 6 [1,3] 2
2 2 3 [2,4] 2
3 2 4 [3,5] 2
4 3 4 [3,5] 2
5 3 6 [1,3] 2

Table 3. Maximum conflict degree priority wavelength demand algorithm

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Table 3. Maximum conflict degree priority wavelength demand algorithm

Algorithm 2：maximum conflict degree priority wavelength demand algorithm

Input：network physical connectivity $α$ ，nodes number N，business request set $R$ ， $k$ .

Output：time slots and paths allocated for services $(t_{r}, p_{r})$ ，total number of wavelengths $W$ .

1）Initialize $W = 1$ ；

2）Generate network physical topology $G = (V, E)$ according to Algorithm 1；

3）Allocate available path sets $P_{r}$ and available time sets $T_{r}$ for service requests $r$ using k-short algorithm；

4）Generate space conflict map and temporal conflict map based on $P_{r}$ and $T_{r}$ ；

5）Calculate time conflict $P_{T C} (r)$ referring to Eq.（14）；

6）Calculate space conflict $P_{P C} (r)$ referring to Eq.（15）；

7）Sort $P_{T C} (r)$ and $P_{P C} (r)$ in descending order；

8）Calculate wavelength conflict $C (r)$ referring to Eqs.（16）and（17）；

9）Sort $C (r)$ in descending order；

10）Allocate wavelength， $p_{r}$ and $t_{r}$ to node with maximum $C (r)$ ；

11）If new wavelength conflict with existing wavelengths，then $W = W + 1$ ；

12）Else $W = W$ ；

13）End if；

14）Remove maximum conflicting business from business request set and go to step 5）；

15）If $R \neq \emptyset$ ，then go to 10）；

16）Else end if.

Table 4. Satellite parameter setting
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Table 4. Satellite parameter setting
Parameter Value
Satellite number 64
Tracks number 8
Intra-orbit satellite number 8
Height /km 1150
Inclination /（°） 53

Table 5. Simulation parameter setting
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Table 5. Simulation parameter setting
Parameter Value
k 2
$σ$ 1
Physical connectivity $α$ 0.3
Network connectivity $β$ 0.5
Transponders number 4
Maximum link hops 4
Business overlap factor 0.6

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Xin Li, Yongjun Li, Shanghong Zhao, Xiang Wang, Zhiqiang Ma, Rui Hou. Research on Wavelength Resource Characteristics of Optical Satellite Network Based on Time-Space Conflict Map[J]. Laser & Optoelectronics Progress, 2023, 60(9): 0906002

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