A method and system for allocating bandwidth in a wireless communication system arranged as a tree structure having a plurality of nodes that are each either a subscriber node or a base station node. A given one of the base station nodes within the tree structure directly serves a plurality of child nodes including at least one child base station node that itself directly serves at least one child subscriber node. The method of bandwidth allocation includes (i) determining a total number of descendant subscriber nodes of the given base station node and (ii) using the total number descendant subscriber nodes of the given base station node as a basis to proportionally allocate a quantity of data bandwidth at the given base station node among the total number of descendant subscriber nodes of the given base station node.