Location-based handover in cellular IEEE 802.11 networks for Factory Automation

Wiśniewski, Łukasz; Trsek, Henning; Dominguez-Jaimes, Ivan; Nagy, Anetta; Exel, Reinhard; Kero, Nikolaus

doi:10.1109/etfa.2010.5641296

Cited by 11 publications

(9 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An example of the flex WARE subsystem-fusion has already been elaborated in detail in [11] and shows how handover can benefit from interacting with the localisation subsystem. The handover mechanism can be initiated by the FC based on the position information of the mobile nodes, instead of using the usual metric (e. g., received signal strength, signal to noise ratio).…”

Section: Feature-fusion and Mutual Benefitsmentioning

confidence: 98%

“…2) Adaptive Resource Allocation: In places where coverage areas (not necessarily of the same channel) are overlapping (e. g., honeycomb structure), where the clocks of all participants are synchronized, and where triggered, real-time enabled handover as described in [11] is available, workload can be shifted between FAPs. This can be exploited to adapt to varying link quality.…”

Section: Clock Synchronization For Real-timementioning

confidence: 99%

“…This timestamp correction in flex WARE is currently used to create the TDoA values for localisation [11] by applying the proposed approach on SMiLE boards which are within the range of a single FAP. The scheme can be expanded using an iterative approach.…”

Section: Synchronization Through the Localisation Infrastructurementioning

confidence: 99%

See 2 more Smart Citations

Integration aspects of wireless industrial automation

Nagy

Ring

Loschmidt

et al. 2011

IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society

View full text Add to dashboard Cite

As there are many applications on the factory floor that can benefit from wireless communication, existing solutions are constantly driven towards new boundaries. The next step is to augment the capability of such solutions by enhancing network management and control to support mobility while fulfilling the real-time constraints of the system. For such a system, not only parallel operation of individual features such as real-time communication, localisation, clock synchronization, etc. is needed, their integration and interaction with each other is also important. Therefore, this paper focuses on aspects dealing with synergy of these features and shows how the individual features can affect each other in order to build a wireless system that provides functionalities which cannot be reached by its wired equivalent.

show abstract

Section: Feature-fusion and Mutual Benefitsmentioning

confidence: 98%

Section: Clock Synchronization For Real-timementioning

confidence: 99%

See 1 more Smart Citation

Integration aspects of wireless industrial automation

Nagy

Ring

Loschmidt

et al. 2011

IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society

View full text Add to dashboard Cite

show abstract

“…As for example, the AP can measure the received signal strength and compare it with a pre-defined threshold, such that the user is assumed to be in Zone 0 if the measured signal is higher than that threshold, whereas the user is assumed to be in Zone 1 otherwise. Nevertheless, in many cases the location information might be already known by the user for other purposes than data transmission, e.g., indoor positioning and handover management [21,40,41]. In this way, the users can share their locations through the uplink.…”

Section: System Modelmentioning

confidence: 99%

Resource allocation and interference management in OFDMA-based VLC networks

Hammouda

Vegni

Haas

et al. 2018

Physical Communication

View full text Add to dashboard Cite

Resource allocation and interference management are two main issues that need to be carefully addressed in visible light communication (VLC) systems. In this paper, we propose a resource allocation scheme that can also handle the intercell interference in a multi-user VLC system that employs orthogonal frequency division multiple access (OFDMA). Particularly, we suggest dividing the cell coverage into two non-overlapping zones and performing a two-step resource allocation process, in which each step corresponds to a different level of allocating resources, i.e., zone and user levels. We initially define both zones in terms of the physical area and the amount of allocated resources and we investigate the impact of illumination requirements on defining both zones. Through simulations, we evaluate the performance of the proposed scheme in terms of the area spectral efficiency and the fairness level between the two zones. We show that both performance measures can be potentially enhanced by carefully setting a certain design parameter that reflects the priority level of the users located in the region around the cell center, denoted as Zone 0, in terms of the achievable rate. We further eventuate the system performance in a realistic transmission ✩ scenario using a simulation tool.Recently, the noticeable advances in white light emitting diodes (LEDs) technology motivated utilizing the visible light spectrum for data transmission along with the white LEDs main function of illumination [6,7,8,9,10,11].In addition to providing the required bandwidth, using white LEDs for data transmission has many advantages over the RF technology. For example, they are cheap, energy efficient and no extra infrastructure is needed since white LEDs would be already installed for lighting. Furthermore, using white LEDs for data transmission would inherently ensure data security since light does not propagate through walls.

show abstract

“…During the handover delay, no user traffic can be exchanged between the access point (AP) and the terminal. Therefore, the whole handover process needs to be completed as fast as possible in order to avoid any interruption of the data traffic [2]. Especially, multimedia streaming applications generally consume a significant amount of network resources so the temporary disconnections or delays that mobile clients experience during handovers can severely degrade the perceptible video quality.…”

Section: Introductionmentioning

confidence: 99%

Reducing handover delays for seamless multimedia service in IEEE 802.11 networks

et al. 2014

View full text Add to dashboard Cite

In IEEE 802.11 wireless local area network (WLAN) environments, handovers occur when a mobile node (client) moves from the coverage area of one access point (AP) to that of another AP. In particular, a handover in multimedia streaming settings requires a series of tasks to be executed -recognising the disconnection to the currently associated AP, searching for other APs in client visibility and so on. The time taken to perform these tasks gives rise to an interruption of service for about 6 s, which greatly decreases users' quality of experience (QoE). To reduce service disruptions caused by handovers in IEEE 802.11 networks, a soft proactive handover scheme that exploits the received signal strength indicator (RSSI) and scalable video coding (SVC) is proposed. The proposed scheme predicts the time that a handover process is going to start using the RSSI values and receives the lightweight base layer code of the SVC-encoded video during a certain interval before the predicted handover starts. Experimental results show that the proposed scheme can minimise service interruption times during the 802.11 handover operations, thereby increasing QoE.Introduction: The handover as defined in IEEE 802.11 wireless local area network (WLAN) [1] is a time-consuming process. During the handover delay, no user traffic can be exchanged between the access point (AP) and the terminal. Therefore, the whole handover process needs to be completed as fast as possible in order to avoid any interruption of the data traffic [2]. Especially, multimedia streaming applications generally consume a significant amount of network resources so the temporary disconnections or delays that mobile clients experience during handovers can severely degrade the perceptible video quality.To address the handover latency and resulting service disruptions, this Letter proposes a soft proactive (SP)-handover scheme that can be applicable at the application level. In 802.11 WLAN environments, service disruptions usually occur in the network boundaries where the received signal quality is low because of discovering optimal AP [3], and thus the available bandwidth for streaming multimedia content is limited. The scheme first predicts the time that a handover is going to start (handover prediction) based on received signal strength indicator (RSSI) thresholds and pre-fetches the quality-reduced, but lightweight, streaming data during a certain period before the predicted handover start time. The data reserved via such pre-fetches are used to provide continuous services during the handover process. Moreover, the scheme uses scalable video coding (SVC) to lower the quality of streaming content. SVC allows the video signal to be encoded into multiple streams in temporal, spatial and quality dimensions [4]. When the RSSI has frequent fluctuations, unnecessary handover predictions grow, which decreases the efficiency of the proposed scheme. To prevent this, the proposed scheme includes RSSI filtering that mitigates signal fluctuations.

show abstract

Location-based handover in cellular IEEE 802.11 networks for Factory Automation

Cited by 11 publications

References 15 publications

Integration aspects of wireless industrial automation

Integration aspects of wireless industrial automation

Resource allocation and interference management in OFDMA-based VLC networks

Reducing handover delays for seamless multimedia service in IEEE 802.11 networks

Contact Info

Product

Resources

About