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The Ultra Flat Architecture is a new concept of fixed-mobile convergent networks that aims to scale well with the mobile Internet traffic explosion prognosticated for the next 5-10 years. This paper presents a new delegation-based UFA signaling framework using HIP, IEEE 802.21 and the context transfer protocol. The main procedures contributed by this signaling framework are terminal attachment, session establishment, proactive handover preparation and handover execution services. The paper introduces several novel Host Identity Protocol extensions, i.e., two different HIP delegation service types for optimized message exchange in HIP-based UFA mobility and multihoming operations, a context transfer scheme for HIP and IPsec associations supporting and extending the mechanisms of the delegation-based UFA functions, and a fast operator-centric method for HIP-level access authorization. The proposed …