A data communication system is provided that allows for the efficient management of data communication sessions requested from a plurality of packet data servicing nodes organized in a cluster, each member of the cluster managing a cluster session table which contains data identifying mobile units and packet data servicing nodes which are servicing data sessions with the mobile unit. This is accomplished by utilizing an antiferromagnetic oxide film below a spin valve sensor in a read region and first and second lead layers in end regions and a ferromagnetic film in each of the lead layers that exchange couples to the antiferromagnetic oxide film in the end regions. Disclosed is also a corresponding apparatus in a network node for establishing neighbor cell relations in a wireless network. The first device then monitors each request for a feature that is directed to a second device to determine whether the feature is supported by the second device. By modeling the change in effective capacitance, one may determine the delay attributable to crosstalk, and upsize cells in the failing net according to a mathematical formula in order to counter the delay. In particular, the sensitizing semiconductor is in form of quantum-dots.