| 1. |
- Johansson, Dan, et al.
(författare)
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A MIP-P2P based architecture for application mobility
- 2011
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Ingår i: Proceedings of the 10th International Conference on Mobile and Ubiquitous Multimedia. - New York : ACM Digital Library. - 9781450310963 ; , s. 85-93
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Konferensbidrag (refereegranskat)abstract
- Mobility exists in many shapes; when migrating a running application (code, states and data) from one device to another, one has achieved application mobility. In this article we combine this mobility type with context awareness, defiining context awareness supported application mobility (CASAM) as when using context in the act of moving an application between hosts during its execution, to provide relevant information and/or services, where relevancy depends on the user's task. We identify and present five CASAM challenges, that are used to create requirements for a CASAM architecture. A proposal for an architecture, building on peer-to-peer (P2P) technology in combination with mobile IP, is then presented, addressing the identified challenges, providing a decentralized framework for global application mobility. As such, our architecture differs from earlier centralized and/or locally bound solutions for application mobility.
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| 2. |
- Åhlund, Andreas, et al.
(författare)
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Context-aware application mobility support in pervasive computing environments
- 2009
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Ingår i: Proceedings of the 6th International Conference on Mobile Technology, Application & Systems : 2009, Nice, France, September 02 - 04, 2009. - New York : ACM Digital Library. - 9781605585369
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Konferensbidrag (refereegranskat)abstract
- In the future, application mobility can play a crucial role and prove to be an enabler for next generation distributed applications. Application mobility lets an application follow the users while they roam between networks using several devices. In order to achieve seamless application mobility, several issues need to be considered such as device heterogeneity, GUI-adaptation and application loss. Thus, in this paper our contributions are two-fold. Firstly, we present our novel architecture called the Application Mobility Manager (A2M) which provides seamless application mobility. The proposed architecture is context-aware and decentralized. Finally, we present a novel application called the Mobile YouTube Player which is capable of moving between heterogeneous devices and provide users with seamless video experience. We validate the proposed system through rigorous experimentation and user studies based on the real-world test bed and prototype implementation. The results clearly validate that the proposed system can support seamless application mobility.
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| 3. |
- Alfredsson, Stefan, 1976-
(författare)
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A Cross-Layer Perspective on Transport Protocol Performance in Wireless Networks
- 2012
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Communication by wireless technologies has seen a tremendous growth in the last decades. Mobile phone technology and wireless broadband solutions are rapidly replacing the last-hop wireline connectivity for telephones and Internet access. Research has, however, shown that Internet traffic can experience a performance degradation over wireless compared to wired networks. The inherent properties of radio communication lead to a higher degree of unreliability, compared to communication by wire or fiber. This can result in an increased amount of transmission errors, packet loss, delay and delay variations, which in turn affect the performance of the main Internet transport protocols TCP and UDP. This dissertation examines the cross-layer relationship between wireless transmission and the resulting performance on the transport layer. To this end, experimental evaluations of TCP and UDP over a wireless 4G downlink system proposal are performed. The experiment results show, in a holistic scenario, that link-level adaptive modulation, channel prediction, fast persistent link retransmissions, and channel scheduling, enables the transport protocols TCP and UDP to perform well and utilize the wireless link efficiently. Further, a novel approach is proposed where a modified TCP receiver can choose to accept packets that are corrupted by bit errors. Results from network emulation experiments indicate that by accepting and acknowledging even small amounts of corrupted data, a much higher throughput can be maintained compared to standard TCP.
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| 4. |
- Andersson, Karl, et al.
(författare)
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A mobility management scheme for heterogeneous environments supporting vehicular speeds using a policy-based approach
- 2008
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Ingår i: Proceedings of the 5th International Workshop Conference on Performance Modelling and Evaluation of Heterogeneous Networks.
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Konferensbidrag (refereegranskat)abstract
- Today, handsets and terminals are typically equipped with multiple radio interfaces. Meanwhile, various types of access networks using different radio technologies are being deployed all over the world. Also, there is a strong trend towards All-IP-Networks following the principle "Everything over IP", and "IP over everything". This development is leading researchers into the area of heterogeneous networking and overlay topologies.This paper focuses on mobility management issues related to such an environment supporting vehicular speeds of users using a policy-based approach and a network-layer metric for access network selection.A Mobile IP-based architecture is proposed where mobility bindings are sent periodically at a frequency depending on the speed of the user also taking variations in the network-layer metric into account and the overall signaling cost. The architecture is designed with a focus on minimizing packet losses and timely handling of vertical hand-overs.
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| 5. |
- Andersson, Karl, et al.
(författare)
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A new MIP-SIP interworking scheme
- 2008
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Ingår i: MUM'08 Proceedings. - New York : ACM Digital Library. - 9781605581927 ; , s. 117-120
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Konferensbidrag (refereegranskat)abstract
- Mobility management is today handled at various layers in the network stack including the datalink layer, the network layer, the transport layer and the application layer. Also, cross-layer designed solutions exist and the most known example is the work performed by IEEE currently standardizing media-independent handover services under the name of IEEE 802.21.This paper proposes a new interworking scheme for Mobile IP and the Session Initiation Protocol being the most popular solutions for mobility management at the network and application layers respectively. The goal is to deliver seamless mobility for both TCP-based and UDP-based applications taking the best features from each mobility management scheme. In short, this paper proposes that TCP connections are handled through Mobile IP while UDP-based connection-less applications may use the Session Initiation Protocol for handling mobility. The two mobility management solutions are integrated into one common solution.
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| 6. |
- Andersson, Karl, et al.
(författare)
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An architecture for seamless mobility management in various types of applications using a combination of MIP and SIP
- 2006
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Ingår i: Proceedings of Swedish National Computer Networking Workshop 2006. - Luleå : Luleå tekniska universitet. ; , s. 33-36
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Konferensbidrag (refereegranskat)abstract
- In the future, mobile users will have the possibility to use a variety of wireless access networks simultaneously making the vision "Always best connected" come true. The Internet Protocol (IP) will most likely be the least common divisor allowing service providers to deploy services in a unified way regardless of access network type (being wired or wireless). The 3GPP-led development of the IP Multimedia Subsystem (IMS) is a promising step towards the vision. However, there are a number of obstacles along this way forward. Various deployment difficulties related to already installed base of user and infrastructure equipment and service providers protecting their old investments are the most common obstacles. In addition to those reasons, somewhat conservative regulatory authorities, short-comings in digital rights management, multiple standardization bodies proposing non-aligned solutions, as well as non-uniformed and non-optimized use of radio spectrum do not improve the speed of change.Our research is performed within the area of seamless real-time multimedia distribution in heterogeneous wireless access networks with a user-centric and end-to-end system approach. Having proposed various extensions to Mobile IP (MIP) including multihoming and port-based handling of flows, as well as solutions for global connectivity in ad hoc networks we now present a combined architecture using both MIP and Session Initiation Protocol (SIP) for mobility management where MIP is used for TCP connections and SIP is used for UDP traffic carrying real-time multimedia streams of data.
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| 7. |
- Andersson, Karl, et al.
(författare)
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Bandwidth efficient mobility management for heterogeneous wireless networks
- 2010
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Ingår i: 2010 7th IEEE Consumer Communications and Networking Conference. - Piscataway, N.J : IEEE Communications Society. - 9781424451753
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Konferensbidrag (refereegranskat)abstract
- An important feature of the upcoming fourth generation wireless networks is support for heterogeneous radio access technologies in combination with an all-IP type of overall architecture. Operators and users will benefit from a smooth technology transition leveraging existing investments and use a variety of access technologies simultaneously. This paper describes and evaluates an innovative mobility management scheme in such an environment. It does not require any changes to the IP stack in the mobile node and does not introduce any additional overhead to the payload traffic over air interfaces. Furthermore, it does not add any signaling overhead and outperforms existing mobility management schemes for heterogeneous environments in terms of bandwidth consumption. The architecture uses a make-before-break principle for vertical handovers and bidirectional tunneling using various tunneling mechanisms connecting mobile nodes through access networks to a home network. Also, it proposes a packet inspection routine for timely handover execution in the home network. The architecture is evaluated both through analytical calculations and experiments using a voice over IP traffic model.
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| 8. |
- Andersson, Karl, et al.
(författare)
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M4: MultiMedia Mobility Manager : a seamless mobility management architecture supporting multimedia applications
- 2007
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Ingår i: Proceedings of the 6th International Conference on Mobile and Ubiquitous Multimedia. - Red Hook, NY : Curran Associates, Inc.. - 9781595939166 ; , s. 6-13
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Konferensbidrag (refereegranskat)abstract
- In this paper, a proof-of-concept and a software architecture, M4 (MultiMedia Mobility Manager), is presented. In short, M4 is offering seamless mobility management to multimedia applications using a variety of wireless access networks. First, M4 is built on multihomed Mobile IP building on the principle of soft handovers. Second, network selection in M4 is based on a network layer metric combining round-trip times and jitter in round-trip times. Third, the end-user can enter its own preferences on network selection through a policy-based extension to the proposed network selection algorithm.The proposed architecture is evaluated in a live heterogeneous networking environment where handover performance is studied in detail. In addition, user-perceived quality of experience for Voice over IP using the M4 software architecture has been studied. Last, downloads of large amount of data using a combination of high and low capacity wireless networks in M4 were studied.Results indicate that the architecture as a whole and the proposed algorithms perform well. M4 can thus be seen as an implementation of the "Always Best Connected" vision.
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| 9. |
- Andersson, Karl, et al.
(författare)
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Mobile mediator control function-an IEEE 802.21-based mobility management and access network selection model
- 2009
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Ingår i: Proceedings of the 18th ICT-Mobile Summit. - : IIMC International Information Management Corporation. - 9781905824120
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Konferensbidrag (refereegranskat)abstract
- This paper proposes a combined network and application layer access network decision model for multimedia applications in heterogeneous networking environments. It builds on previous work of a network layer based metric used in combination with multihomed Mobile IP and introduces a mechanism for applications to interact with the mobility management system in the mobile node. This way, applications executing in the mobile node can decide either to take access network decisions on their own or to let the network layer handle mobility management tasks automatically based on default decision criterion decided by the end-user.An extended architecture based on previous work and the upcoming IEEE 802.21 standard for media-independent handover services is presented. The control plane, named "Mobile Mediator Control Function", offers a set of events and commands through an additional service access point. Results from a scenario with a Voice over IP application running in the proposed environment simulated in OPNET Modeler are presented.
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| 10. |
- Andersson, Karl, et al.
(författare)
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Mobility management for highly mobile users and vehicular networks in heterogeneous environments
- 2008
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Ingår i: 2008 IEEE 33rd Conference on Local Computer Networks. - Piscataway, NJ : IEEE Communications Society. - 9781424424139 ; , s. 593-599
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Konferensbidrag (refereegranskat)abstract
- With the recent developments in wireless networks, different radio access technologies are used in different places depending on capacity in terms of throughput, cell size, scalability etc. In this context, mobile users, and in particular highly mobile users and vehicular networks, will see an increasing number and variety of wireless access points enabling Internet connectivity. Such a heterogeneous networking environment needs, however, an efficient mobility management scheme offering the best connection continuously. In this paper, a mobility management architecture focusing on efficient network selection and timely handling of vertical and horizontal hand-overs is proposed. The solution is based on Mobile IP where hand-over decisions are taken based upon calculations of a metric combining delay and delay jitter. For efficiency reasons, the frequency of binding updates is dynamically controlled, depending on speed and variations in the metric. The dynamic frequency of binding updates helps the timely discovery of congested access points and cell edges so as to allow efficient hand-overs that minimize packet drops and hand-over delays.Results show that the overall signaling cost is decreased and changes in networking conditions are detected earlier compared to standard Mobile IP.
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