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Table 1 Notation

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

Notation

Definition

N

Number of RSUs

\(\mathcal {N}\)

Set of RSUs

Kn

Number 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

B

Channel bandwidth

N0

Noise power spectral density

S

Size 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

Fm

Total 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