Symbol | Definition |
---|---|
B | Set of base stations (BSs) sites. |
R | Set of relay stations (RSs) sites. |
T | Set of User Equipment (UE) or users. |
(b,r) | Denotes link between BS b and RS r. |
(b,t) | Denotes link between BS b and UE t. |
(r,t) | Denotes link between RS r and UE t. |
\(c_{b}^{B}\) | Denotes BS cost at BS site b. |
\(c_{r}^{R}\) | Denotes RS cost at RS site r. |
\(l_{b,r}^{BR}\) | Denotes path loss associated with link (b,r). |
\(l_{b,t}^{BT}\) | Denotes path loss associated with link (b,t). |
\(l_{r,t}^{RT}\) | Denotes path loss associated with link (r,t). |
\(m_{b,r}^{BR}\) | Represents upper bound (e.g., channel capacity) on the possible information |
 | flow rate associated with the link (b,r). |
\(m_{b,t}^{BT}\) | Represents upper bound (e.g., channel capacity) on the possible information |
 | flow rate associated with the link (b,t). |
\(m_{r,t}^{RT}\) | Represents upper bound (e.g., channel capacity) on the possible information |
 | flow rate associated with the link (r,t). |
\(u_{t}^{T}\) | Denotes traffic demand of UE t. |
C1 and | Denotes the maximum capacity (in bits per second) for each |
C2 | Deployed BS and RS, respectively. |
W1 and | Weight parameters for two terms of objective function. |
W2 | Â |
\(y_{b}^{B}\) | Denotes binary decision variables that determine |
 | whether a BS b is deployed at BS site. |
\(y_{r}^{R}\) | Denotes binary decision variables that determine |
 | whether a RS r is deployed at RS site. |
\(x_{b,r}^{BR}\) | Binary decision variables that denotes whether a connection |
 | is established on corresponding links (b,r). |
\(x_{b,t}^{BT}\) | Binary decision variables that denotes whether a connection |
 | is established on corresponding links (b,t). |
\(x_{r,t}^{RT}\) | Binary decision variables that denotes whether a connection |
 | is established on corresponding links (r,t). |