A method of operating a heterogeneous radio access network, the heterogeneous radio access network comprising a macro layer including at least one macro cell served by a macro base station node and a micro layer comprising at least one micro cell served by a micro base station node, the heterogeneous radio access network comprising plural macro cells and plural micro cells within each of the plural macro cells, the method comprising: dividing a frequency bandwidth usable by the heterogeneous radio access network into a frequency-partitioned portion which is less than the entire frequency bandwidth; assigning a frequency of the frequency-partitioned portion to a wireless terminal in an edge region of the micro cell; assigning a frequency of the frequency bandwidth to a wireless terminal which is in a center region of the micro cell or at least within a center region of the macro cell; dividing the frequency bandwidth usable by the heterogeneous radio access network into plural partitions including a first partition and a second partition; dividing the plural partitions into plural sub-partitions; assigning a frequency of a second partition to a wireless terminal in an edge region of one of the plural micro cells by: assigning a frequency of a first sub-partition of the second partition if the wireless terminal is in an edge region of a micro cell in a first macro cell; and assigning a frequency of a second sub-partition of the second partition if the wireless terminal is in an edge region of a micro cell in a second macro cell; assigning a frequency of a first partition to a wireless terminal in one of the plural macro cells by: assigning a frequency of a first sub-partition of the first partition if the wireless terminal is in a first macro cell and interferes with any micro base station node; assigning a frequency of a second sub-partition of the first partition if the wireless terminal is in a second macro cell and interferes with any micro base station node. dividing a frequency bandwidth usable by the heterogeneous radio access network into a frequency-partitioned portion which is less than the entire frequency bandwidth; assigning a frequency of the frequency-partitioned portion to a wireless terminal in an edge region of the micro cell; assigning a frequency of the frequency bandwidth to a wireless terminal which is in a center region of the micro cell or at least within a center region of the macro cell; dividing the frequency bandwidth usable by the heterogeneous radio access network into plural partitions including a first partition and a second partition; dividing the plural partitions into plural sub-partitions; assigning a frequency of a second partition to a wireless terminal in an edge region of one of the plural micro cells by: assigning a frequency of a first sub-partition of the second partition if the wireless terminal is in an edge region of a micro cell in a first macro cell; and assigning a frequency of a second sub-partition of the second partition if the wireless terminal is in an edge region of a micro cell in a second macro cell; assigning a frequency of a first sub-partition of the second partition if the wireless terminal is in an edge region of a micro cell in a first macro cell; and assigning a frequency of a second sub-partition of the second partition if the wireless terminal is in an edge region of a micro cell in a second macro cell; assigning a frequency of a first partition to a wireless terminal in one of the plural macro cells by: assigning a frequency of a first sub-partition of the first partition if the wireless terminal is in a first macro cell and interferes with any micro base station node; assigning a frequency of a second sub-partition of the first partition if the wireless terminal is in a second macro cell and interferes with any micro base station node. assigning a frequency of a first sub-partition of the first partition if the wireless terminal is in a first macro cell and interferes with any micro base station node; assigning a frequency of a second sub-partition of the first partition if the wireless terminal is in a second macro cell and interferes with any micro base station node.