Table 2 QoS aggregation functions

Time

\({\boldsymbol{q}}_{\textbf{1}}=\sum_{n^{\prime }=\textbf{1}}^{{\boldsymbol{N}}^{\prime }}{\boldsymbol{q}}_{\boldsymbol{Te}}^{{\boldsymbol{S}}_{\boldsymbol{m}}}\)

Cost

\({\boldsymbol{q}}_{\textbf{2}}=\sum_{n^{\prime }=\textbf{1}}^{{\boldsymbol{N}}^{\prime }}{\boldsymbol{q}}_{\boldsymbol{Ct}}^{{\boldsymbol{S}}_{\boldsymbol{m}}}\)

Reliability

\({\boldsymbol{q}}_{\textbf{3}}=\prod_{n^{\prime }=\textbf{1}}^{{\boldsymbol{N}}^{\prime }}{\boldsymbol{q}}_{\boldsymbol{Rl}}^{{\boldsymbol{S}}_{\boldsymbol{m}}}\)

Reputation

\({\boldsymbol{q}}_{\textbf{4}}=\frac{\textbf{1}}{{\boldsymbol{N}}^{\prime }}\sum_{n^{\prime }=\textbf{1}}^{{\boldsymbol{N}}^{\prime }}{\boldsymbol{q}}_{\boldsymbol{Rp}}^{{\boldsymbol{S}}_{\boldsymbol{m}}}\)