| 1. |
- Granlund, Daniel, et al.
(författare)
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Project: BASICNET
- 2008
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Annan publikation (populärvet., debatt m.m.)abstract
- Broadband Access Services In Converging NETworks
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| 2. |
- 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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| 3. |
- 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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| 4. |
- Brännström, Robert, et al.
(författare)
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Multimedia flow mobility in heterogeneous networks using multihomed mobile IP
- 2007
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Ingår i: Journal of Mobile Multimedia. - 1550-4646 .- 1550-4654. ; 3:3, s. 218-234
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Tidskriftsartikel (refereegranskat)abstract
- Communication in next generation networks will use multiple access technologies, creating a heterogeneous network environment. To enable end-user terminals to move between access networks with minimal disruption, the terminals should be able to maintain multiple active network connections. Such a multihomed mobile host will experience differences in capabilities and coverage area depending on the access technologies. This paper proposes and evaluates an extension to Mobile IP enabling multihoming, regardless of the access technology. Mobility of multimedia communication in this environment should adapt to changing conditions and be based on dynamic measurements and user preferences. The proposed architecture gives opportunities for mobile multimedia applications to use multiple access networks simultaneously and the possibility to move individual flows between access networks and between user devices. Media flows are identified by destination IP address, protocol and port number. Evaluation results are presented both from a simulation study and from a real world prototype implementation using three different wireless access technologies: 802.11, UMTS and 802.16-2004.
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| 5. |
- Brännström, Robert, et al.
(författare)
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Sensor monitoring of bridge movement : a system architecture
- 2011
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Ingår i: Proceedings of The 36th IEEE Conference on Local Computer Networks (LCN). - : IEEE Communications Society. - 9781612849287 ; , s. 797-800
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Konferensbidrag (refereegranskat)abstract
- This paper describes a sensor-based accelerometermonitoring system for bridge monitoring. A system with 18 sensors will be mounted on a 130-meter long cable-strayed bridge that is built during the summer of 2011. In order to monitor the natural frequency of the bridge (including vibrations and damping) the system should manage accelerometer readings at 50 Hz. The communication channel, sample rate requirements and number of sensors put limitations on the system architecture.
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| 6. |
- Elkotob, Muslim, et al.
(författare)
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Multimedia QoE optimized management using prediction and statistical learning
- 2010
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Ingår i: 35th Annual IEEE Conference on Local Computer Networks. - Piscataway, NJ : IEEE Communications Society. - 9781424483884 ; , s. 328-331
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Konferensbidrag (refereegranskat)abstract
- In this paper, we present a scheme for flow management with heterogeneous access technologies available indoors and in a campus network such as 3G and Wi-Fi. Statistical learning is used as a key for optimizing a target variable namely video quality of experience (QoE). First we analyze the data using passive measurements to determine relationships between parameters and their impact on the main performance indicator, namely the video QoE value. The derived weights are used for performing prediction in every discrete time interval of our designed autonomic control loop to know approximately the QoE in the next time interval and be able to perform a switch to another access technology if it yields a better QoE level. This user-perspective performance optimization is in line with operator and service provider goals. QoE performance models for slow vehicular and pedestrian speeds for Wi-Fi and 3G are derived and compared as well.
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| 7. |
- Granlund, Daniel, et al.
(författare)
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A case study of application development for mobile and location-based services
- 2013
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Ingår i: Proceedings of the 15th International Conference on Information Integration and Web-based Applications & Services (iiWAS2013). - New York : ACM Digital Library. - 9781450321136 ; , s. 658-662
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Konferensbidrag (refereegranskat)abstract
- In this paper we present a case study of a location-dependent service, aimed for tourists. Two applications are developed, one based on native technologies, the other on HTML5 and related frameworks. We provide implementation details and compare the different solutions in terms of location support, compliance with required features, and cross-platform functionality. Our experiments show that web-based approaches may lead to significant benefits over using native technologies; both versions of the application displayed comparable location support and compliance with required features, while the web version superseded its native counterpart in cross-platform functionality.
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| 8. |
- Granlund, Daniel, et al.
(författare)
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A scalability study of AAA support in heterogeneous networking environments with global roaming support
- 2011
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Ingår i: TrustCom 2011. - Los Alamitos, Calif : IEEE Computer Society Press. - 9780769546001 ; , s. 488-493
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Konferensbidrag (refereegranskat)abstract
- In this paper, we present a scalability study of AAA support in mobile heterogeneous access networks with respect to server and network load related to AAA processes using the RADIUS protocol. Technologies such as IEEE 802.11, CDMA 2000 and UMTS which all support the RADIUS protocol for AAA handling are discussed and analyzed. Typical performance data are gathered and complemented with a theoretical study in order to achieve an overview of what parameters will affect the performance and scalability of the network. Also, guidelines are developed for network design in order to achieve the desired performance for a given number of users. Results of this study include the conclusion that the main bottleneck of the AAA procedure is not necessarily the AAA server CPU power. Aside the cases with a high proportion of computationally intensive WiFi sign-ons with strong encryption, performance issues may be caused by AAA server network connection bandwidth, and RAM memory. In cases where a high number of users reside in the same user database, database performance becomes a significant issue. In order to achieve better performance, CPU load balancing over several servers may be performed.
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| 9. |
- Granlund, Daniel, et al.
(författare)
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A uniform AAA handling scheme for heterogeneous networking environments
- 2009
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Ingår i: 2009 IEEE 34th Conference on Local Computer Networks. - Piscataway, NJ : IEEE Communications Society. - 9781424444885 ; , s. 683-687
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Konferensbidrag (refereegranskat)abstract
- Starting with an efficient mobility management scheme for heterogeneous wireless networks, this paper proposes a solution for AAA handling using a common database for storing user information. Regardless of the access technology selected, user@realm identities are used for authentication, authorization, and accounting. In particular, a new function is introduced in which port-based network access control is used in combination with dynamic host configuration protocol mechanisms for IP address allocation. This way, PPP-based and Ethernet-based access technologies are handled uniformly.Advantages with the proposed solution include: using only standardized mechanisms in the mobile node, as well as in the access networks. Only an additional plug-in in the AAA server (located in the access networks) needs to be deployed.The proposed AAA architecture has been implemented and evaluated in a live experimental environment. Results show authentication and authorization to perform efficiently and seamlessly.
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| 10. |
- Granlund, Daniel, et al.
(författare)
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EAP-Swift : An Efficient Authentication and Key Generation Mechanism for Resource Constrained WSNs
- 2015
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Ingår i: International Journal of Distributed Sensor Networks. - : SAGE Publications. - 1550-1329 .- 1550-1477.
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Tidskriftsartikel (refereegranskat)abstract
- Technological advances within the area of wireless sensor technology allow WSNs to be used in a increasing number of measurement scenarios. As new application areas are emerging, such as infrastructure monitoring and smart cities, the need for sensor mobility handling requires efficient and secure authentication protocols. This paper presents EAP-Swift, a novel EAP based authentication protocol with a focus on lightweight processing and faster response. It supports end-to-end session encryption key generation and mutual authentication. By utilizing lightweight hashing algorithms, the challenge-response authentication mechanism uses only two round trips to the AAA server for the complete authentication procedure leading to the reduction of latency by 33% compared to the baseline protocols. Further, using extensive experimentation, we validate that the authentication time can be kept below 250 ms and the power consumption can be kept below 15 mJ. Furthermore, we show that a battery lifetime of more than four years can be achieved when running the system on a regular button cell battery. Finally, the protocol was verified in terms of security using the AVISPA tool.
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