Pyrimidine derivatives of formula in which J and Y represent aromatic or heteroaromatic rings; R2, G, G\u2032, and G\u2033 represent substituent groups and R2a represents H or halogen; L represents a linking group; and M represents CH or N. A network control unit assigns selected base stations to transmit communication data to the WTRU based on the WTRU being disposed in base station or base station sector geographic range of service. An electrolyte within the device may also include an ion-transport fluid, for example infiltrated into a porous solid support. An N-type layer, having a higher dopant concentration than the drift region, is then formed and etched to have sidewalls.