than $\rho_o$.

-   **Fact 2**: the average interference signal received from any single interfering IoT device associated with the origin RRH strictly equals to $\rho_o$.

-   **Fact 3**: IoT devices choosing the same co-channel preamble as the randomly selected IoT device may become an interfering IoT device.

-   **Fact 4**: at each minislot, IoT devices with non-empty queue may become interfering IoT devices.

-   **Fact 5**: IoT devices in difference slices may not mutually interfere.

Note that Fact 1 and Fact 2 are direct consequences of the device-RRH association policy and power control scheme. Fact 5 holds due to the exploration of intra-slice isolation. Therefore, the aggregate interference received at the origin RRH can take the following form $$\label{eq:I_intra}
\begin{array}{l}
    {\cal I}_{s}(t) = \sum\limits_{{u_{m,s}} \in \Phi_s \backslash \{ o\} } {{\mathbbm 1}({p_m}||{d_m}|{|^{ - \varphi }} = {\rho _o}){\mathbbm  1}(N_{a,s}{(t)} > 0)} \times \\
    \qquad \quad \text{ } {{\mathbbm 1}({f_m} = {f_o}){\rho _o}{h_m}}, \forall s \in {\mathcal{S}^I}
\end{array}$$ where $o$ represents the randomly selected IoT device associated with the RRH at the origin, $p_m$ represents the transmit power of the $m$-th IoT device, $||d_m||$ is the distance between the $m$-th IoT device and the origin RRH, $f_o$ denotes the preamble and 