5 GHz W-LAN verification for public mobile applications - Internet newspaper on train and advanced ambulance car

Ohta, Gen-ichiro; Kamada, Fumitaka; Teramura, N.; Hojo, Hiroshi

doi:10.1109/ccnc.2004.1286924

Cited by 10 publications

(3 citation statements)

References 1 publication

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“…Nagatuma (2003) states that "in the test system, the ambulance side PCs and the emergency hospital side PCs are connected with 100BASE-TX switching hubs as a local area network (LAN)" (p. 226). Ohta, Kamada, and Teramura (2004) also state that "as for high data uplink requirement, the emergency medical system was recommended and 10Mbps wireless uplink was built by 5GHz WLAN " (p. 574).…”

Section: Introductionmentioning

confidence: 99%

Study of Vehicle Vibration for High-Performance Land Mobile Satellite Tracking System for Telemedicine

Kitano

2014

International Journal of E-Health and Medical Communications

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The land mobile satellite service (LMSS) is a key component of telemedicine and an important technology for grasping the status of a patient in an ambulance. However, rough road surfaces can destabilize satellite tracking and disturb data communications with the ambulance carrying the patient. Nevertheless, accurate estimates of the location of the vehicle at any given time and rapid reconfiguration of the tracking antenna based on past data can allow stable and effective data communications. This study examined positions characterized by large vibration amplitudes from past data on vehicle vibrations due to rough road surfaces as feature points to provide the vehicle system in advance with reference pitch angle vibration data. Drawing on reference vibration data for convolution and a cost function, The authors synchronized past data with real-time vibration data and accurately estimated the point at which the ambulance or other vehicle passes on the road. They also discuss limits on the range of vibrations that can be used for data synchronization. This study demonstrates that the present method enables high-precision estimates of vehicle location.

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Section: Introductionmentioning

confidence: 99%

Study of Vehicle Vibration for High-Performance Land Mobile Satellite Tracking System for Telemedicine

Kitano

2014

International Journal of E-Health and Medical Communications

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“…Next generation communications networks are being investigated thoroughly to satisfy its ultimate goal: accessible at any time and anywhere. One key point to satisfy such aim is to increase both data rate and processing speed [1] [2]. The Wireless local area networks (WLANs) are able to comply with such demands and have become one of the fastest growing segments in the communications industry, especially with utilizing the new version of its protocol IEEE 802.11n [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Limited Retransmission on the Performance of WLANs Using Error-Prone Channel

AlSabbagh¹,

Chen²,

Xu³

2008

IJCNS

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In WLANs, stations sharing a common wireless channel are governed by IEEE 802.11 protocol. Many conscious studies have been conducted to utilize this precious medium efficiently. However, most of these studies have been done either under assumption of idealistic channel condition or with unlimited retransmitting number. This paper is devoted to investigate influence of limited retransmissions and error level in the utilizing channel on the network throughput, probability of packet dropping and time to drop a packet. The results show that for networks using basic access mechanism the throughput is suppressed with increasing amount of errors in the transmitting channel over all the range of the retry limit. It is also quite sensitive to the size of the network. On the other side, the networks using four-way handshaking mechanism has a good immunity against the error over the available range of retry limits. Also the throughput is unchangeable with size of the network over the range of retransmission limits. However, the throughput does not change with retry limits when it exceeds the maximum number of the backoff stage in both DCF’s mechanisms. In both mechanisms the probability of dropping a packet is a decreasing function with number of retransmissions and the time to drop a packet in the queue of a station is a strong function to the number of retry limit, size of the network, the utilizing medium access mechanism and amount of errors in the channel

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“…A combination of some of these technologies is typically considered to be used by the TWCS [7,12,19,22,[27][28][29][30][31]. Table 1 gives an overview of the different characteristics of these access technologies [7,32].…”

Section: Access Technologiesmentioning

confidence: 99%

A novel network architecture for train-to-wayside communication with quality of service over heterogeneous wireless networks

Pareit

Velde

Naudts

et al. 2012

J Wireless Com Network

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In the railway industry, there are nowadays different actors who would like to send or receive data from the wayside to an onboard device or vice versa. These actors are e.g., the Train Operation Company, the Train Constructing Company, a Content Provider, etc. This requires a communication module on each train and at the wayside. These modules interact with each other over heterogeneous wireless links. This system is referred to as the Train-to-Wayside Communication System (TWCS). While there are already a lot of deployments using a TWCS, the implementation of quality of service, performance enhancing proxies (PEP) and the network mobility functions have not yet been fully integrated in TWCS systems. Therefore, we propose a novel and modular IPv6-enabled TWCS architecture in this article. It jointly tackles these functions and considers their mutual dependencies and relationships. DiffServ is used to differentiate between service classes and priorities. Virtual local area networks are used to differentiate between different service level agreements. In the PEP, we propose to use a distributed TCP accelerator to optimize bandwidth usage. Concerning network mobility, we propose to use the SCTP protocol (with Dynamic Address Reconfiguration and PR-SCTP extensions) to create a tunnel per wireless link, in order to support the reliable transmission of data between the accelerators. We have analyzed different design choices, pinpointed the main implementation challenges and identified candidate solutions for the different modules in the TWCS system. As such, we present an elaborated framework that can be used for prototyping a fully featured TWCS.

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5 GHz W-LAN verification for public mobile applications - Internet newspaper on train and advanced ambulance car

Cited by 10 publications

References 1 publication

Study of Vehicle Vibration for High-Performance Land Mobile Satellite Tracking System for Telemedicine

Study of Vehicle Vibration for High-Performance Land Mobile Satellite Tracking System for Telemedicine

Influence of the Limited Retransmission on the Performance of WLANs Using Error-Prone Channel

A novel network architecture for train-to-wayside communication with quality of service over heterogeneous wireless networks

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