Skip to main content

Table 1 Notation

From: Energy-efficient offloading decision-making for mobile edge computing in vehicular networks

NotationDefinition
NNumber of RSUs
\(\mathcal {N}\)Set of RSUs
KnNumber of vehicles connects to RSU n
\(\mathcal {K}_{n}\)Set of vehicles connects to RSU n
\(H_{k_{n}}^{n}\)Channel gain between kn and RSU n
BChannel bandwidth
N0Noise power spectral density
SSize of a data packet
\(I_{k_{n}}\)Interference power from other RSU to vehicle kn
\(p_{k_{n}}^{m}\)Transmission power of kn
\(p_{k_{n}}^{l}\)Local execution power of kn
\(R_{k_{n}}^{m}\)Transmission rate of kn
\(C_{k_{n}}^{m}\)Number of packets executed by the MEC server
\(C_{k_{n}}^{l}\)Number of packets executed by kn
\(N_{k_{n}}^{f}\)Number of flexible subtasks of kn
\(N_{k_{n}}^{l}\)Number of local subtasks of kn
\(\alpha _{k_{n}},\beta _{k_{n}}\)Offloading decision
FmTotal computation resource of the MEC server
\(F_{k_{n}}^{m}\)Allocated computation resource to kn by the MEC server
\(F_{k_{n}}^{l}\)Local computation resource
\(L_{k_{n}}\)Packet number of each subtask of kn
\(Z_{k_{n}}\)Computation intensity of each subtask of kn
\(E_{k_{n}}^{m}\)Transmission energy consumption of flexible subtask of kn
\(E_{k_{n}}^{l1}\)Local energy consumption of flexible subtasks of kn
\(E_{k_{n}}^{l2}\)Local energy consumption of local subtasks of kn
\(A_{k_{n}}^{m}\)Number of arrival packets in the transmission queue of kn
\(A_{k_{n}}^{l}\)Number of arrival packets in the local queue of kn
\(Q_{k_{n}}^{m}\)Transmission queue of kn
\(Q_{k_{n}}^{l}\)Local queue of kn
\(D_{k_{n}}^{m}\)Number of drop packets in the transmission queue of kn
\(D_{k_{n}}^{l}\)Number of drop packets in the local queue of kn
\(Q_{k_{n}}^{m}\)Packet drop penalty in the transmission queue of kn
\(Q_{k_{n}}^{l}\)Packet drop penalty in the local queue of vehicle kn