$\mathcal{U}$	set of users in the room;
$\mathcal{A}$	set of access points;
$\mathcal{W}$	set of available wavelengths (RYGB);
$\mathcal{B}$	set of receiver branches (faces);
parameters:
u, m	user indices; u is desired user, m indexes other users who may cause interference;
a, b	access point indices; a is the access point allocated to user u, b is an access point allocated to another user m;
λ	wavelength index;
f, g	receiver face (branch), for the desired user and the other users;
$P{O}_{u,f}^{a,\lambda }$	optical power received by user u from an access point a using wavelength λ and branch f. This value was precalculated using a channel modelling tool, where the line of sight and first-order reflection components were calculated for the given access point and user location and for the given wavelengths on each branch;
$P_{u,f}^{a,\lambda }$	the squared electrical current at the receiver of user u due to the optical power received from access point a at the wavelength λ on receiver branch f. (Note that the squared current and electrical power are equivalent for a given system input impedance);
${\sigma }_{u,f}^{b,\lambda }$	the shot noise mean square current at the receiver of user u due to the background unmodulated power of access point b operating at wavelength λ on receiver branch f;
σRx	the mean square receiver noise current;
variables:
${\gamma }_{u,f}^{a,\lambda }$	SINR of user u assigned to access point a and wavelength λ using branch f of the receiver;
$S_{u,f}^{a,\lambda }$	a selector function where a binary value of 1 indicates the assignment of user u to access point a and wavelength λ (figure 3) and received through branch f of the receiver;
${\varphi }_{m,u,f}^{a,\hspace{0.17em}b,\lambda }$	non-negative linearization variable, where ${\varphi }_{m,u,f}^{a,\hspace{0.17em}b,\lambda }=\hspace{0.17em}{\gamma }_{u,f}^{a,\lambda }\hspace{0.17em}{S}_{m,g}^{b,\lambda }$.