From: Energy-efficient renewable scheme for rechargeable sensor networks
WSN | Wireless sensor network |
WET | Wireless energy transfer |
ERSVC | Energy-efficient renewable scheme with variable cycle |
 | (proposed scheme) |
TSP | Traveling salesman problem |
ECPM | Energy consumption per mile |
MCV | Mobile charging vehicle |
Emin | Minimum energy required to keep a sensor node operational |
\(\mathcal {N}\) | The set of sensor nodes in the network |
O | The service station |
B | The base station |
Emax | Full battery capacity at a sensor node |
Ri | Data rate generated by node i |
pi | The power consumption of node i |
ti | Charging time of node i |
V | Traveling speed of MCV |
U | Energy transfer rate of MCV |
T | Period of a trip cycle of MCV |
Ti | Charging period of node i |
Ti′ | Time interval between two adjacent arrivals at node i |
xij(or xiB) | Flow rate from node i to node j (or base station) |
βij(or βiB) | Power consumption for transmitting a unit of data from node i |
 | to node j (or base station) |
βr | Power consumption for receiving a unit of data rate |
dij | Distance between node i and node j |
α | Path loss index |
Ptotal | Total power consumption in the system |
λ | Efficiency of non-radiative energy transfer |
ηvac | The ratio of MCV’s vacation time |
tvac | MCV’s vacation time at service station |
r | The number of set needs to be classified |
Sk | The defined set needs to be classified |
Fj | The set of nodes which should be visited during the jth cycle |
Pj | The traveling path of MCV during the jth cycle |