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Table 1 Symbol notations

From: DQN-based resource allocation for NOMA-MEC-aided multi-source data stream

Notation

Definition

S

Number of sources

\(D_s\)

The sth sources

\(q_s\)

The bits of the sth source data stream

\(c_s\)

The CPU cycles of the sth source data stream

\(\beta _s\)

The percentage of source \(D_s\) data stream to be unloaded to the CAP

\(|h_{s}|^2\)

Channel gain of wireless channel from the source \(D_s\) offloaded to the CAP

\(P_s\)

Transmit power of source \(D_s\)

B

Bandwidth of wireless channel from \(D_s\) to CAP

\(t_s\)

Calculation delay of the sth source data stream unloading to the CAP

\(T_1\)

The delay in the unloading phase

\(E_1\)

System energy consumption in the unloading phase

\(f_s\)

local computing capability on source \(D_s\)

\(t_{\rm local}^s\)

Local calculation delay of the sth source

\(T_2\)

Total local calculated time

\(P_{\rm local}^s\)

Local calculated power of the sth source

\(E_2\)

Total total local calculated energy consumption

\(F_s\)

The computational power allocated to each source of the CAP

\(t_{\rm MEC}^s\)

Computation delay at the CAP of source \(D_s\)

\(T_3\)

Total calculation delay at the CAP

\(P_{\rm MEC}^s\)

The calculated power of the CAP

\(E_3\)

System energy consumption produced at the CAP

\(T_{\rm total}\)

Total calculation delay of multi-source data streams

\(E_{\rm total}\)

Total energy consumption

\(P_{\max }^{s}\)

Maximum transmit power of the source

\(\mu\)

A weight factor of system cost

\(\alpha _s\)

Transmit power ratio of source \(D_s\)

\(\Theta _{s}\)

System cost