Network Layer Mobility: an Architecture and Survey
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paper_title: Mobile Users: To Update or not to Update?

paper_content:

Tracking strategies for mobile users in wireless networks are studied. In order to save the cost of using the wireless links mobile users should not update their location whenever they cross boundaries of adjacent cells. This paper focuses on three natural strategies in which the mobile users make the decisions when and where to update: the time-based strategy, the number of movements-based strategy, and the distance-based strategy. We consider both memoryless movement patterns and movements with Markovian memory along a topology of cells arranged as a ring. We analyze the performance of each one of the three strategies under such movements, and show the performance differences between the strategies.
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Title: Network Layer Mobility: an Architecture and Survey

Section 1: Introduction
Description 1: Introduce the problem of network layer mobility, discuss the limitations of current Internet protocols, and outline the scope and approach of the paper.

Section 2: Internet Naming and Addressing
Description 2: Discuss the fundamentals of Internet architecture, focusing on the importance of unique network addresses for hosts and the hierarchical structure of addressing.

Section 3: Internet Addressing
Description 3: Provide details on IP addressing, discussing the significance of the network-id and host-id components, and the necessity of hierarchical addressing for scalable routing.

Section 4: Naming
Description 4: Explore the concept of host names as user-defined aliases, their translation to IP addresses via DNS, and the challenges posed by mobility.

Section 5: Mobility Problem: Directory Service View
Description 5: Analyze the impact of host mobility on static name-to-address bindings and the limitations of the DNS in a mobile environment.

Section 6: Mobility Problem: Internet View
Description 6: Explain how mobility disrupts IP addressing and routing, with a focus on why current Internet architectures fail to support mobile hosts without breaking active TCP connections.

Section 7: Network Layer Solution Architecture
Description 7: Describe a proposed network layer architecture that enables the integration of mobile end-systems within the Internet, along with key concepts like Mobile Host, Home Address, and Home Network.

Section 8: Two Tier Addressing
Description 8: Introduce and elaborate on the concept of two-tier addressing to resolve issues associated with dual-use of internet addresses.

Section 9: Architecture Components
Description 9: Detail the key components of the proposed architecture, including Forwarding Agent (FA), Location Directory (LD), and Address Translation Agent (ATA).

Section 10: Location Update Protocol
Description 10: Discuss the protocol required to keep the LD and its cached entries up-to-date and consistent to ensure reliable mobile host accessibility.

Section 11: Packet Forwarding Operation
Description 11: Illustrate the operation of packet forwarding with the inclusion of ATA and FA, detailing the address translation process and transport layer transparency.

Section 12: Address Translation Mechanisms
Description 12: Describe the methods of address translation, focusing on encapsulation and loose source routing (LSR).

Section 13: Mapping to candidate Mobile IP proposals
Description 13: Present various Mobile IP proposals and show how they can be mapped to the proposed network architecture, highlighting their unique design choices and mechanisms.

Section 14: Columbia Scheme
Description 14: Analyze the Columbia Scheme focused on campus environments and its design choices for addressing and forwarding mobility.

Section 15: Sony Scheme
Description 15: Review Sony's approach to mobile networking, including its unique address mapping tables and update mechanisms.

Section 16: LSR Scheme
Description 16: Examine the Loose Source Routing (LSR) Scheme and its use of IP routing options to support mobile hosts.

Section 17: Mobile IP working-group Proposal
Description 17: Discuss the proposal by the IETF Mobile IP working group, focusing on its near-term deployability and design considerations for location updates and address translation.

Section 18: IPv6 Mobility Proposal
Description 18: Summarize the proposal for mobility support in IPv6, highlighting its enhancements over IPv4 and the elimination of Foreign Agents.

Section 19: Summary
Description 19: Summarize the key points of the paper, discussing the proposed network layer architecture and how various Mobile IP proposals align with this architecture.