Collaborative Computing and Resource Allocation for LEO Satellite-Assisted Internet of Things

Table 1

Simulation parameters.

Parameter	Symbol	Value
Scene parameters
Task size		8-1.2 bit
Rate of task arrival		0.05
Latency constraint of task		200 ms
Length of time slot		10 ms
Number of satellite orbits		18
Number of satellites per orbit		40
Height of LEO satellite		1200 km
Inclination of satellite orbit		87.9°
Phase factor of orbit		1
Minimum elevation angle of user		20°
Greenwich hour angel		10.2°
CPU cycle needed for processing		1000 cycles/bit
Satellite communication capacity		10 Gbps
Satellite computing capacity		10 GC/s
Local computing capacity		1.5 GC/s
Algorithm parameters
Step size of dual ascent		0.001
Maximum training episode		150000
Size of replay buffer		20000
Observation size		5000
Discount factor		0.95
Positive reward		5
Completion reward		15
Learning rate		0.001