Ubiquitous Personal Content Transfer in a Hybrid and Heterogeneous Wireless Network Environment

1. Ubiquitous Personal Content Transfer in a Hybrid and Heterogeneous Wireless Network Environment Junkang MA, Dr. John Hannah, Dr. Dave Laurenson

2. Outline • Introduction and Related Work • Problem Statement and Analysis • PDE-based Scheme details • Performance Analysis • Conclusion and Future Work PDE = Personal Distributed Environment

3. Introduction and Related Work • Two challenges for ubiquitous content transfer: 1. The heterogeneous networking environment with differing network coverage and access technologies. 2. One individual user owns multiple personal devices, each of which may have multiple wireless interfaces. They can connect to each other with short-range technology. The coexistence of infrastructure-based and infrastructure-less communication leads to a hybrid networking environment • Wireless Personal Area Network (WPAN) A mobile network with multiple wireless interfaces accompanying the moving individual user, composed of multiple personal devices

4. Introduction and Related Work (IP Layer) • Local short-range communication (infrastructure-less) technology: Pure Ad-hoc • Global mobile communication (infrastructure-based) technology: Mobile IP (MIP): for single mobile node (e.g. a PDA) Network Mobility (NEMO): for a moving network (e.g. a WPAN ) • There is a “gap” between the two kinds of communication.

5. Problem statement: Scenario A • Scenario A: Intra-WPAN communication without contacting remote entities (pure ad hoc mode), supporting receiver devices that move from inside to outside the WPAN (from pure ad hoc mode to global transfer mode) [WPAN - Wireless Personal Area Network]

6. Problem statement: Scenario A • Pure Ad-hoc mode: does not support mobility • MIP/NEMO mode with Routing Optimization (RO): Drawbacks: HA dependency High delay and cost MR connectivity

7. Problem statement: Scenario B • Scenario B: WPANs of two individual users communicate with each other directly, without contacting remote entities. Mobility is also required. [WPAN - Wireless Personal Area Network]

8. Problem statement: Scenario B • Pure Ad-hoc mode: does not support mobility • MIP/NEMO mode with RO: Drawbacks: HA dependency High delay and cost MR connectivity

9. Problem statement: Analysis Existing schemes are unsuitable when local transfer and 'continuous communication with mobility' are both required in a hybrid networking environment. The aim of the research: keep communication continuous in such a hybrid networking environment and also keep high performance for local content transfer [MIP = Mobile IP; NEMO = NEtwork MObility; MANET = Mobile Ad-hoc NETwork; MANEMO = Mobile Ad-hoc NETwork MObility]

10. PDE-based Scheme • Personal Distributed Environment • PCM: Personal Content Management • DME: Device Management Entity

11. PDE-based Scheme • Extended Functions of the DME Mapping table: URI (Universal Resource Identity) ---> Addresses (Home Address and multiple Care-of Address)

12. PDE-based Scheme: Scenario A • Scheme procedure for Scenario A 1. PCM and DME initiate the Content Transfer [PAA = Personal Assistant Agent; URI = Universal Resource Identifier; PCM = Personal Content Manager; Distributed Mobile Environment; HoA = Home Address; CoA = Care off Address; IBU = Initial Binding Update; CN = Correspondent Node]

13. PDE-based Scheme: Scenario A 2. Content Transfer: local transfer can be established immediately using MANET (pure ad-hoc mode) 3. Binding Update: transfer can be kept continuous when device moves out of MANET (seamless changes from ad-hoc mode to global mobile transfer mode ) [MANET = Mobile Ad-hoc NETwork; MN = Mobile Node; IBU = Initial Binding Update; PCM = Personal Content Manager; CN = Correspondent Node ]

14. PDE-based Scheme: Scenario B • MR1 and MR2 can establish the routing between the two mobile networks. [MR = Mobile Router; MN = Mobile Node; IBU = Initial Binding Update; ACT = ACKnowledgement; IBACK = Initial Binding ACK; BU = Binding Update; Manager; BACK = Binding ACK]

15. PDE-based Scheme This PDE-based scheme has a number of advantages: • HA independency. Furthermore, if it is a stand-alone WPAN without Internet connectivity, local content can also be transferred via the Ad-hoc directly. When the WPAN connects to the Internet, it can change to standard MIP/NEMO mode seamlessly and keep the transfer continuous. • Low delay and cost. • No MR connectivity is needed for local content transfer. • Selection of transfer modes. The PCM implements the selection and change of transfer modes by different pre-set bindings of CoAs.

16. Wireless bandwidth Wireless latency Wired bandwidth Wired latency Session length Session rate Performance Analysis • Average Establishment delay (ted) and Cost (C): the average delay and cost for a CN to get the MN’s CoA so as to establish the transfer with Routing Optimization (RO). • Average Establishment Delay • Average Establishment Cost

17. Performance Analysis • Parameter Settings

18. Performance Analysis • Simulation result to show the performance improvement of delay and cost

19. Conclusion and Future Work • Conclusion: We have proposed a PDE-based scheme combining the virtues of standard MIP/NEMO mode and the advantages of pure ad hoc mode. This not only can enable a mobile user to achieve ubiquitous personal content transfer but also has a higher performance in such a hybrid networking environment. • Future Work: • Hardware experiment for PDE-based Scheme • Decision making of PCM

20. For further information please contact: Junkang MA E-mail: j.ma@ed.ac.uk