0000000000025795

AUTHOR

Vitaliy Tykhomyrov

showing 9 related works from this author

On ARQ feedback intensity of the IEEE 802.16 ARQ mechanism

2008

The IEEE 802.16 standard defines the ARQ mechanism as a part of the MAC layer. The functioning of the ARQ mechanism depends on a number of parameters. The IEEE 802.16 specification defines them but it does not provide concrete values and solutions. We ran simulation scenarios to study how the ARQ feedback intensity impacts the performance of application protocols. The simulation results reveal that a low ARQ feedback intensity results only in a marginal improvement. Though it is possible to optimize the ARQ feedback intensity, it is reasonable to rely upon more frequent ARQ feedback messages as they do not result in a performance degradation. At the same time, ARQ connections, which work on…

Go-Back-N ARQIEEE 802business.industryComputer scienceAutomatic repeat requestComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSHybrid automatic repeat requestData_CODINGANDINFORMATIONTHEORYWiMAXSelective Repeat ARQSliding window protocolTelecommunications linkWirelessForward error correctionbusinessError detection and correctionComputer network2008 International Conference on Telecommunications
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Performance Evaluation of the IEEE 802.16 ARQ Mechanism

2007

The IEEE 802.16 technology defines the ARQ mechanism that enables a connection to resend data at the MAC level if an error is detected. In this paper, we analyze the key features and parameters of the ARQ mechanism. In particular, we consider a choice for the ARQ feedback type, a scheduling of the ARQ feedbacks and retransmissions, the ARQ block rearrangement, ARQ transmission window and ARQ block size. We run a number of simulation scenarios to study these parameters and how they impact a performance of application protocols. The simulation results reveal that the ARQ mechanism plays an important role in transmitting data over wireless channels in the IEEE 802.16 networks.

IEEE 802Computer sciencebusiness.industryComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSHybrid automatic repeat requestData_CODINGANDINFORMATIONTHEORYScheduling (computing)Selective Repeat ARQSliding window protocolApplication protocolWirelessbusinessBlock sizeComputer network
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Link Adaptation Thresholds for the IEEE 802.16 Base Station

2008

The IEEE 802.16 technology defines a number of modulation and coding schemes that the base station can use to achieve the best tradeoff between the spectrum efficiency and the resulting application level throughput. However, the 802.16 specification does not define any particular link level adaptation algorithm, neither does it specify the SNR thresholds to switch between modulation and coding schemes. In this paper we consider a link adaptation model and conduct a number of simulation runs to find transition thresholds for ARQ and HARQ retransmission mechanisms. All the simulations are done with the 802.16 extension for the NS-2 simulator.

IEEE 802Computer sciencebusiness.industryRetransmissionComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSReal-time computingHybrid automatic repeat requestLink adaptationData_CODINGANDINFORMATIONTHEORYSpectral efficiencyBase stationLink levelbusinessComputer networkCoding (social sciences)Proceedings of the 3rd International Conference on Performance Evaluation Methodologies and Tools
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Optimal MAC PDU Size in IEEE 802.16

2008

In the IEEE 802.16 the number of errors and the MAC PDU size have an impact on the performance of the network. We present a way to estimate the optimal PDU size and we run a number of simulation scenarios to study these parameters and how they impact on the performance of application protocols. The simulation results reveal that the channel bit error rate has a major impact on the optimal PDU size in the IEEE 802.16 networks. Also, the ARQ block rearrangement influences the performance.

IEEE 802Computer sciencebusiness.industryAutomatic repeat requestComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSReal-time computingHybrid automatic repeat requestData_CODINGANDINFORMATIONTHEORYWiMAXBit error ratebusinessError detection and correctionComputer networkBlock (data storage)Communication channel2008 4th International Telecommunication Networking Workshop on QoS in Multiservice IP Networks
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WINSE: WiMAX NS-2 extension

2009

IEEE 802.16 standard defines the wireless broadband technology called WiMAX. When compared to other wireless technologies, it introduces many interesting advantages at PHY, MAC, and QoS layers. Heavy simulations are needed to study IEEE 802.16 performance and propose further enhancements to this standard. Link level simulations are not always sufficient, while system level simulators are not always accurate to capture MAC and transport protocol details. We implemented a 802.16 extension for the NS-2 network simulator. It includes upper PHY modeling, almost all the features of the 802.16 MAC layer, as well as the QoS framework. This article describes the implemented features, simulation meth…

Wireless broadbandIEEE 802.11w-2009Computer sciencebusiness.industryInter-Access Point ProtocolQuality of serviceComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSLink levelIEEE 802.1XNetwork allocation vectorbusinessWiMAXComputer networkProceedings of the Second International ICST Conference on Simulation Tools and Techniques
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Increasing the VoIP Capacity through MAP Overhead Reduction in the IEEE 802.16 OFDMa Systems

2010

One of the main issues with supporting VoIP service over 802.16 networks is the signalling overhead caused by the downlink MAP messages due to frequent transmissions and small packets. To decrease the MAP overhead, the 802.16 standard proposes some mechanisms, such as the compressed MAP and sub-MAPs. In this paper, we show by means of extensive dynamic simulations that sub-MAPs can reduce dramatically the signalling overhead associated with VoIP traffic and significantly improve overall VoIP capacity. At the same time, since sub-MAPs are more sensitive to packet drops, they tend to increase the number of HARQ retransmissions in downlink and transmission delays in the uplink direction.

IEEE 802Voice over IPComputer sciencebusiness.industryNetwork packetComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSReal-time computingHybrid automatic repeat requestData_CODINGANDINFORMATIONTHEORYTransmission (telecommunications)Telecommunications linkOverhead (computing)businessComputer networkIEEE 802.11r-2008
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Performance analysis of the ieee 802.16 arq mechanism

2007

The IEEE 802.16 technology defines the ARQ mechanism that enables a connection to resend data at the MAC level if an error is detected. In this paper, we analyze the key features and parameters of the 802.16 ARQ mechanism. In particular, we consider a choice for the ARQ feedback type, an algorithm to build block sequences, a scheduling of the ARQ feedbacks and retransmissions, the ARQ block rearrangement, ARQ transmission window and ARQ block size. We run a number of simulation scenarios to study these parameters and how they impact a performance of application protocols. The simulation results reveal that the ARQ mechanism and its correct configuration play an important role in transmittin…

Go-Back-N ARQIEEE 802Computer sciencebusiness.industryComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSHybrid automatic repeat requestData_CODINGANDINFORMATIONTHEORYScheduling (computing)Selective Repeat ARQSliding window protocolWirelessError detection and correctionbusinessComputer networkProceedings of the 10th ACM Symposium on Modeling, analysis, and simulation of wireless and mobile systems
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Analysis and Performance Evaluation of the IEEE 802.16 ARQ Mechanism

2008

The IEEE 802.16 standard defines the ARQ mechanismas a part of the MAC layer. The functioning of the ARQmechanism depends on a number of parameters. The IEEE802.16 specification defines them but it does not provide concrete values and solutions. This paper studies the key features and parameters of the 802.16 ARQ mechanism. In particular, we consider a choice for the ARQ feedback type, an algorithm to build block sequences, the ARQ feedback intensity, a scheduling of the ARQ feedbacks and retransmissions, the ARQ block rearrangement, ARQ transmission window and the ARQ block size. We ran simulation scenarios to study these parameters and how they impact the performance of application protoc…

lcsh:Computer softwareIEEE 802Computer sciencebusiness.industryNS-2ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSData_CODINGANDINFORMATIONTHEORYKey featuresScheduling (computing)Selective Repeat ARQlcsh:QA76.75-76.765ARQApplication protocolIEEE 802.16 WiMAXElectrical and Electronic EngineeringbusinessBlock sizeIEEE 802.16 WiMAX; ARQ; NS-2SoftwareComputer networkData transmissionJournal of Communications Software and Systems
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Impact of portable device restrictions on IEEE 802.16 performance

2008

IEEE 802.16 is a good alternative for fast wireless connection in the next generation portable information devices (PID). However it was not originally designed for portable devices, but mobility was added later to the specification. This means that the lack of resources on portable devices might have a significant impact on which IEEE 802.16 features should be chosen and how they should be used. Proper usage of ARQ can increase the IEEE 802.16 performance but it can also require much resources from PIDs. In this paper we focus on how ARQ features are affected by limited resources on PID and how much the limitations affect on the performance.

IEEE 802business.industryWireless networkComputer scienceBroadband networksAutomatic repeat requestComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSComputerApplications_COMPUTERSINOTHERSYSTEMSWiMAXBase stationEmbedded systemWirelessMobile telephonybusinessComputer networkPORTABLE-POLYTRONIC 2008 - 2nd IEEE International Interdisciplinary Conference on Portable Information Devices and the 2008 7th IEEE Conference on Polymers and Adhesives in Microelectronics and Photonics
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