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This document introduces a novel access controlarchitecture for publicly accessible wireless overlay net-works. The architecture is designed to address the prob-le s of ubiquitous Internet service provisioning withinthe city of Lancaster.The proposed access control mechanism is based onthe concepts of secure user authentication, packet ark-ing, and network-level packet filtering. The novelty of thearchitecture lies in its use of micro-cellular layer threenetworks to acquire fine grained access control in a linkindependent manner.The paper describes the concepts behind the accesscontrol architecture and demonstrates to what extent itaddresses the security, performance and extensibilityconcerns of public access packet switched wirelessnetworks.