System performance of the EDGE concept for enhanced data rates in GSM and TDMA/136

Furuskar, A.; Bladsjo, D.; Eriksson, S.; Frodigh, M.; Javerbring, S.; Olofsson, H.

doi:10.1109/wcnc.1999.796748

Cited by 19 publications

(7 citation statements)

References 7 publications

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“…The process of matching the coding scheme to [23] that involves the combination of a retransmitted block with the previous transmission attempts of the block having distinct puncturing patterns. The data bits per block for each of the transmission modes and the associated data rates, modulation schemes and coding rates [24] are presented in Table I. The throughput for a TU ideal frequency hopping and interference-limited scenario is presented for different EGRPS coding schemes, as a function of C/I c (ratio of carrier power to co-channel interference) in [23].…”

Section: ) Egprs Data Transmission Methodsmentioning

confidence: 99%

TCP Performance Dynamics and Link-Layer Adaptation Based Optimization Methods for Wireless Networks

Singh

Bambos

et al. 2007

IEEE Trans. Wireless Commun.

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Abstract-Almost a decade long research on the performance of TCP in wireless networks has resulted in many proposals and solutions [1]-[9] to the problem of TCP throughput degradation. Several of these measures, however, have their share of drawbacks. With the continuing emergence of wireless technologies ever since the work on TCP performance over wireless began, smart link-layer mechanisms like adaptive modulation and coding, power control, and incremental redundancy have been designed and deployed. In this work, we outline a cross-layer optimization framework based on the congestion control dynamics of a bulk-transfer TCP flow and demonstrate its application to networks which offer link-layer adaptive measures. We begin by observing that the TCP's congestion window dynamics are comprised of certain recurring patterns which we term as cycles. We then overlay a TCP throughput optimization methodology that selects link-layer transmission modes (e.g. modulation scheme, coding rate, transmission power, or a combination thereof) in accordance with TCP dynamics and wireless channel conditions. We provide insights into the working of the optimization procedure which protects TCP segments against losses on the wireless channel when the TCP congestion window size (in bytes) is below the bandwidth-delay product of the network. The protection against wireless channel losses is rendered by the link-layer by employing robust modulation and coding schemes, high transmission power, etc. We show that TCP dynamics aware link adaptation measures lead to substantial enhancement of TCP throughput in EGPRS and IEEE 802.11a networks.

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Section: ) Egprs Data Transmission Methodsmentioning

confidence: 99%

TCP Performance Dynamics and Link-Layer Adaptation Based Optimization Methods for Wireless Networks

Singh

Bambos

et al. 2007

IEEE Trans. Wireless Commun.

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“…Wireless broadband services are needed for real-time transfer of vital signs, real-time video feeds, and fluent mobile use of EHRs [30,31]. The highest data rate requirements for sending vital signs is 15kbit/s, so 2G transmission speeds are sufficient for that purpose [32][33][34]. A real-time video stream (HD720i) needs 3-4Mbits/s, a transmission speed that in practice requires 4G network coverage [35,36].…”

Section: The Technological Solutions To Improve Information Exchange mentioning

confidence: 99%

How to improve communication using technology in emergency medical services? A case study from Finland

et al. 2018

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The field of emergency medical services (EMS) is a challenging environment for ensuring fluent information exchange between stakeholders because several different kinds of organizations are involved in EMS missions. Solutions for information and communication technology can vary significantly depending on the organization. This study aims to identify current communication bottlenecks between EMS professionals, understand the technological challenges behind them, and describe technologies that can improve EMS communication in the future. Information for the study about current EMS processes, technologies, and technology needs was collected from EMS professionals during three workshops, five personal interviews, and one email questionnaire. All surveyed health care professionals were working in the county of Northern Ostrobothnia. Information about proposed technologies for EMS was obtained from literature and interviews with five technology companies. The principal problem in EMS communication is scattered health data. This leads to a lack of common situational awareness for professionals and incomplete medical histories for patients. The reasons behind those problems are different information systems which do not communicate with each other and the lack of a common electronic patient care record (ePCR) for use by stakeholders. Personal health measurements, sensors, telemedicine, and artificial intelligence will create opportunities for further improving the flow of communication in EMS, provided those tools can be integrated into decision-making systems.

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“…In early systems (such as EDGE [7]) using AMC, the MCS selector is based on Bit Error Probability (BEP) estimates. The uncoded BEP is estimated at the output of the equalizer.…”

Section: A Bit Error Probability (Bep)mentioning

confidence: 99%

EESM for IEEE 802.16e: WiMaX

Mumtaz¹,

Gamerio²,

Rodriguez

2008

Seventh IEEE/ACIS International Conference on Computer and Information Science (Icis 2008)

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For Link Level interfacing packet switched simulation adopt the AVI (actual value interface) approach for mapping the computed SNR to the Block Error Rate (BLER) Statistics. However in OFDM based system the BLER is invariant within Radio transport channel due to fading channel and adjutant bit carriers mapping, rendering the AVI to be inaccurate. Due to large variability of the channel in frequency domain, two links with same average SNR can experience drastically different performance, thus making it difficult to accurately predict the instantaneous link performance such as Frame Error Rate (FER). To overcome this problem with AVI the EESM has been used as a low complexity approach. In this paper the feasibility of EESM as an abstraction method is investigated, and then calibrated and evaluated for Link Level Interface in WiMax System IEEE802.16e.This methods is then extended to handle more advanced link enhancement such as Alamouti encoding. The Exp-ESM method has better accuracy than the existing link error methods, and preferred link error predictor for system simulator.

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System performance of the EDGE concept for enhanced data rates in GSM and TDMA/136

Cited by 19 publications

References 7 publications

TCP Performance Dynamics and Link-Layer Adaptation Based Optimization Methods for Wireless Networks

TCP Performance Dynamics and Link-Layer Adaptation Based Optimization Methods for Wireless Networks

How to improve communication using technology in emergency medical services? A case study from Finland

EESM for IEEE 802.16e: WiMaX

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