A communications network comprising: a resource manager that is configured to regulate carrier assignment for bidirectional wireless communications between a network component and a plurality of radioterminals, the carrier assignment regulation including selecting among a plurality of frequency division duplexing return subcarriers within at least one FDD return carrier grouping for coupling to a selected one or more of a plurality of FDD forward carriers, and including controlling the network component to receive communications from a first one of the radioterminals on the selected FDD return subcarrier and to transmit communications to the radioterminals on the selected one or more FDD forward carriers, wherein the resource manager is further configured to dynamically couple and decouple particular ones of the FDD return subcarriers to particular ones of the FDD forward carriers in response to changing communication bandwidth requirements between the radioterminals and the network component and/or changes in the prevailing interference conditions; and wherein the resource manager is further configured to select a plurality of FDD return subcarriers from among FDD return subcarriers (f1a, f1b, f1n, f2a, f2b, f2n,..., fNa, fNb, fNn) that are located within a plurality of different spaced apart FDD return carrier groupings (f1, f2,..., fN) for coupling to a particular one of the FDD forward carriers for simultaneous bidirectional communications between the first radioterminal and the network component in response to communication bandwidth requirements from the first radioterminal or prevailing interference conditions, and the plurality of FDD return subcarriers that are coupled to a particular one of the FDD forward carriers reside in at least two different FDD return carrier groupings that are spaced apart in a defined frequency spectrum with at least one non-selected FDD return carrier grouping located therebetween, and the plurality of FDD return subcarriers coupled to the particular one of the FDD forward carriers are used at a same time for return communications from the first radioterminal to the network component while forward communications from the network component to at least some of the radioterminals, including the first radioterminal, are occurring using the particular one of the FDD forward carriers. a resource manager that is configured to regulate carrier assignment for bidirectional wireless communications between a network component and a plurality of radioterminals, the carrier assignment regulation including selecting among a plurality of frequency division duplexing return subcarriers within at least one FDD return carrier grouping for coupling to a selected one or more of a plurality of FDD forward carriers, and including controlling the network component to receive communications from a first one of the radioterminals on the selected FDD return subcarrier and to transmit communications to the radioterminals on the selected one or more FDD forward carriers, wherein the resource manager is further configured to dynamically couple and decouple particular ones of the FDD return subcarriers to particular ones of the FDD forward carriers in response to changing communication bandwidth requirements between the radioterminals and the network component and/or changes in the prevailing interference conditions; and wherein the resource manager is further configured to select a plurality of FDD return subcarriers from among FDD return subcarriers (f1a, f1b, f1n, f2a, f2b, f2n,..., fNa, fNb, fNn) that are located within a plurality of different spaced apart FDD return carrier groupings (f1, f2,..., fN) for coupling to a particular one of the FDD forward carriers for simultaneous bidirectional communications between the first radioterminal and the network component in response to communication bandwidth requirements from the first radioterminal or prevailing interference conditions, and the plurality of FDD return subcarriers that are coupled to a particular one of the FDD forward carriers reside in at least two different FDD return carrier groupings that are spaced apart in a defined frequency spectrum with at least one non-selected FDD return carrier grouping located therebetween, and the plurality of FDD return subcarriers coupled to the particular one of the FDD forward carriers are used at a same time for return communications from the first radioterminal to the network component while forward communications from the network component to at least some of the radioterminals, including the first radioterminal, are occurring using the particular one of the FDD forward carriers.