The Experts below are selected from a list of 13164 Experts worldwide ranked by ideXlab platform

Ignas Niemegeers - One of the best experts on this subject based on the ideXlab platform.

  • performance analysis of the Link Layer Protocol for uwb impulse radio networks
    Performance Evaluation of Wireless Ad Hoc Sensor and Ubiquitous Networks, 2006
    Co-Authors: Nan Shi, Ignas Niemegeers
    Abstract:

    The Self-organizing Device discovery and Data transmission Protocol (SDD) is a novel self-organizing Link Layer Protocol, that was proposed for UWB impulse radio based networks. By means of simulations, it has been indicated that the SDD Protocol enables a node to discover most of its neighboring nodes in short discovery time, in the mean time, appropriately avoids collisions. Further evaluations are carried out in this paper by creating a new analytical model to investigate the theoretical relations among the discovery time, the discovery ratio and the system parameters. It can be concluded that the SDD Protocol is an efficient, scalable and well performed Protocol

  • Med-Hoc-Net - A Link Layer Protocol for Self-Organizing Ultra Wide Band Impulse Radio Networks
    Challenges in Ad Hoc Networking, 2006
    Co-Authors: Nan Shi, Liang Xia, Ignas Niemegeers
    Abstract:

    Ultra Wide Band (UWB) impulse radio, promises to be suitable for short-range, low-power, low cost and high data rate applications. While most UWB research is concentrating on the physical Layer, little research has been published on the Link Layer. A novel self-organizing Link Layer Protocol (SDD) based on time hopping impulse radio was proposed by the authors. In this paper, the SDD Protocol is further developed and specified in detail. The simulations are carried out using the GloMoSim simulation environment.

  • PE-WASUN - Performance analysis of the Link Layer Protocol for UWB impulse radio networks
    Proceedings of the 3rd ACM international workshop on Performance evaluation of wireless ad hoc sensor and ubiquitous networks - PE-WASUN '06, 2006
    Co-Authors: Nan Shi, Ignas Niemegeers
    Abstract:

    The Self-organizing Device discovery and Data transmission Protocol (SDD) is a novel self-organizing Link Layer Protocol, that was proposed for UWB impulse radio based networks. By means of simulations, it has been indicated that the SDD Protocol enables a node to discover most of its neighboring nodes in short discovery time, in the mean time, appropriately avoids collisions. Further evaluations are carried out in this paper by creating a new analytical model to investigate the theoretical relations among the discovery time, the discovery ratio and the system parameters. It can be concluded that the SDD Protocol is an efficient, scalable and well performed Protocol

  • a Link Layer Protocol for self organizing ultra wide band impulse radio networks
    Annual Mediterranean Ad Hoc Networking Workshop, 2005
    Co-Authors: Nan Shi, Liang Xia, Ignas Niemegeers
    Abstract:

    Ultra Wide Band (UWB) impulse radio, promises to be suitable for short-range, low-power, low cost and high data rate applications. While most UWB research is concentrating on the physical Layer, little research has been published on the Link Layer. A novel self-organizing Link Layer Protocol (SDD) based on time hopping impulse radio was proposed by the authors. In this paper, the SDD Protocol is further developed and specified in detail. The simulations are carried out using the GloMoSim simulation environment.

  • a self organizing Link Layer Protocol for uwb ad hoc networks
    Lecture Notes in Computer Science, 2004
    Co-Authors: Nan Shi, Ignas Niemegeers
    Abstract:

    Ultra Wide Band (UWB) impulse radio is a promising technology for future short-range, low-power, low cost and high data rate ad hoc networks. The technology is being explored in a number of research projects. While most UWB research for this class of networks is concentrating on the physical Layer, little research has been published on Link Layer Protocols which exploit the specifics of UWB impulse radio. In this paper, we focus on the self-organization concept and the peculiarities of UWB technology from a physical and a Link Layer point of view. A novel self-organizing Link Layer Protocol based on time hopping spread spectrum is proposed in this paper. This Protocol promises to be an efficient and collision-free mechanism that enables the devices to discover neighbor nodes and arrange the access to communication resources shared among the nodes. The adjustable parameters of the Protocol enable the network to adapt to a dynamic environment.

Nan Shi - One of the best experts on this subject based on the ideXlab platform.

  • performance analysis of the Link Layer Protocol for uwb impulse radio networks
    Performance Evaluation of Wireless Ad Hoc Sensor and Ubiquitous Networks, 2006
    Co-Authors: Nan Shi, Ignas Niemegeers
    Abstract:

    The Self-organizing Device discovery and Data transmission Protocol (SDD) is a novel self-organizing Link Layer Protocol, that was proposed for UWB impulse radio based networks. By means of simulations, it has been indicated that the SDD Protocol enables a node to discover most of its neighboring nodes in short discovery time, in the mean time, appropriately avoids collisions. Further evaluations are carried out in this paper by creating a new analytical model to investigate the theoretical relations among the discovery time, the discovery ratio and the system parameters. It can be concluded that the SDD Protocol is an efficient, scalable and well performed Protocol

  • Med-Hoc-Net - A Link Layer Protocol for Self-Organizing Ultra Wide Band Impulse Radio Networks
    Challenges in Ad Hoc Networking, 2006
    Co-Authors: Nan Shi, Liang Xia, Ignas Niemegeers
    Abstract:

    Ultra Wide Band (UWB) impulse radio, promises to be suitable for short-range, low-power, low cost and high data rate applications. While most UWB research is concentrating on the physical Layer, little research has been published on the Link Layer. A novel self-organizing Link Layer Protocol (SDD) based on time hopping impulse radio was proposed by the authors. In this paper, the SDD Protocol is further developed and specified in detail. The simulations are carried out using the GloMoSim simulation environment.

  • PE-WASUN - Performance analysis of the Link Layer Protocol for UWB impulse radio networks
    Proceedings of the 3rd ACM international workshop on Performance evaluation of wireless ad hoc sensor and ubiquitous networks - PE-WASUN '06, 2006
    Co-Authors: Nan Shi, Ignas Niemegeers
    Abstract:

    The Self-organizing Device discovery and Data transmission Protocol (SDD) is a novel self-organizing Link Layer Protocol, that was proposed for UWB impulse radio based networks. By means of simulations, it has been indicated that the SDD Protocol enables a node to discover most of its neighboring nodes in short discovery time, in the mean time, appropriately avoids collisions. Further evaluations are carried out in this paper by creating a new analytical model to investigate the theoretical relations among the discovery time, the discovery ratio and the system parameters. It can be concluded that the SDD Protocol is an efficient, scalable and well performed Protocol

  • a Link Layer Protocol for self organizing ultra wide band impulse radio networks
    Annual Mediterranean Ad Hoc Networking Workshop, 2005
    Co-Authors: Nan Shi, Liang Xia, Ignas Niemegeers
    Abstract:

    Ultra Wide Band (UWB) impulse radio, promises to be suitable for short-range, low-power, low cost and high data rate applications. While most UWB research is concentrating on the physical Layer, little research has been published on the Link Layer. A novel self-organizing Link Layer Protocol (SDD) based on time hopping impulse radio was proposed by the authors. In this paper, the SDD Protocol is further developed and specified in detail. The simulations are carried out using the GloMoSim simulation environment.

  • a self organizing Link Layer Protocol for uwb ad hoc networks
    Lecture Notes in Computer Science, 2004
    Co-Authors: Nan Shi, Ignas Niemegeers
    Abstract:

    Ultra Wide Band (UWB) impulse radio is a promising technology for future short-range, low-power, low cost and high data rate ad hoc networks. The technology is being explored in a number of research projects. While most UWB research for this class of networks is concentrating on the physical Layer, little research has been published on Link Layer Protocols which exploit the specifics of UWB impulse radio. In this paper, we focus on the self-organization concept and the peculiarities of UWB technology from a physical and a Link Layer point of view. A novel self-organizing Link Layer Protocol based on time hopping spread spectrum is proposed in this paper. This Protocol promises to be an efficient and collision-free mechanism that enables the devices to discover neighbor nodes and arrange the access to communication resources shared among the nodes. The adjustable parameters of the Protocol enable the network to adapt to a dynamic environment.

Jinglin Shi - One of the best experts on this subject based on the ideXlab platform.

  • Efficient design and implementation of LTE UE Link-Layer Protocol stack
    2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013
    Co-Authors: Manli Qian, Y.b Huang, Yiqing Zhou, Yuanyuan Wang, Wei Wei, Jinglin Shi
    Abstract:

    3GPP Long Term Evolution (LTE) and its enhancement has become the main candidate of 4G standards. Due to the requirements on high data rate and low latency for broadband wireless communication systems, LTE air-interface Protocol stack must be designed and implemented with high data processing efficiency. Following a general description of the LTE user equipment (TIE), this paper analyzes the main challenges in the Link-Layer Protocol stack design and implementation, including the data processing efficiency, synchronization, flexibility and portability. A reference design of LTE TIE Link-Layer Protocol stack software is then presented with several design methodologies. A memory access optimization and light-weighted thread model are proposed to improve the data processing efficiency, while a hardware triggered synchronization mechanism is exploited to maintain synchronous between the Link-Layer Protocol stack and the physical Layer. Finally, the platform flexibility and portability is achieved by employing interface abstraction and adapters. Extensive system level testing shows that the proposed LTE TIE Protocol stack software achieves high data rate and low data processing latency in a hardware resource restricted platform, which can be further extended to commercial LTE TIE products.

  • WCNC - Efficient design and implementation of LTE UE Link-Layer Protocol stack
    2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013
    Co-Authors: Manli Qian, Yiqing Zhou, Wei Wei, Yi Huang, Wang Yuanyuan, Jinglin Shi
    Abstract:

    3GPP Long Term Evolution (LTE) and its enhancement has become the main candidate of 4G standards. Due to the requirements on high data rate and low latency for broadband wireless communication systems, LTE air-interface Protocol stack must be designed and implemented with high data processing efficiency. Following a general description of the LTE user equipment (TIE), this paper analyzes the main challenges in the Link-Layer Protocol stack design and implementation, including the data processing efficiency, synchronization, flexibility and portability. A reference design of LTE TIE Link-Layer Protocol stack software is then presented with several design methodologies. A memory access optimization and light-weighted thread model are proposed to improve the data processing efficiency, while a hardware triggered synchronization mechanism is exploited to maintain synchronous between the Link-Layer Protocol stack and the physical Layer. Finally, the platform flexibility and portability is achieved by employing interface abstraction and adapters. Extensive system level testing shows that the proposed LTE TIE Protocol stack software achieves high data rate and low data processing latency in a hardware resource restricted platform, which can be further extended to commercial LTE TIE products.

Manli Qian - One of the best experts on this subject based on the ideXlab platform.

  • Efficient design and implementation of LTE UE Link-Layer Protocol stack
    2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013
    Co-Authors: Manli Qian, Y.b Huang, Yiqing Zhou, Yuanyuan Wang, Wei Wei, Jinglin Shi
    Abstract:

    3GPP Long Term Evolution (LTE) and its enhancement has become the main candidate of 4G standards. Due to the requirements on high data rate and low latency for broadband wireless communication systems, LTE air-interface Protocol stack must be designed and implemented with high data processing efficiency. Following a general description of the LTE user equipment (TIE), this paper analyzes the main challenges in the Link-Layer Protocol stack design and implementation, including the data processing efficiency, synchronization, flexibility and portability. A reference design of LTE TIE Link-Layer Protocol stack software is then presented with several design methodologies. A memory access optimization and light-weighted thread model are proposed to improve the data processing efficiency, while a hardware triggered synchronization mechanism is exploited to maintain synchronous between the Link-Layer Protocol stack and the physical Layer. Finally, the platform flexibility and portability is achieved by employing interface abstraction and adapters. Extensive system level testing shows that the proposed LTE TIE Protocol stack software achieves high data rate and low data processing latency in a hardware resource restricted platform, which can be further extended to commercial LTE TIE products.

  • WCNC - Efficient design and implementation of LTE UE Link-Layer Protocol stack
    2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013
    Co-Authors: Manli Qian, Yiqing Zhou, Wei Wei, Yi Huang, Wang Yuanyuan, Jinglin Shi
    Abstract:

    3GPP Long Term Evolution (LTE) and its enhancement has become the main candidate of 4G standards. Due to the requirements on high data rate and low latency for broadband wireless communication systems, LTE air-interface Protocol stack must be designed and implemented with high data processing efficiency. Following a general description of the LTE user equipment (TIE), this paper analyzes the main challenges in the Link-Layer Protocol stack design and implementation, including the data processing efficiency, synchronization, flexibility and portability. A reference design of LTE TIE Link-Layer Protocol stack software is then presented with several design methodologies. A memory access optimization and light-weighted thread model are proposed to improve the data processing efficiency, while a hardware triggered synchronization mechanism is exploited to maintain synchronous between the Link-Layer Protocol stack and the physical Layer. Finally, the platform flexibility and portability is achieved by employing interface abstraction and adapters. Extensive system level testing shows that the proposed LTE TIE Protocol stack software achieves high data rate and low data processing latency in a hardware resource restricted platform, which can be further extended to commercial LTE TIE products.

Syed Ali Khayam - One of the best experts on this subject based on the ideXlab platform.

  • An energy-efficient Link Layer Protocol for reliable transmission over wireless networks
    EURASIP Journal on Wireless Communications and Networking, 2009
    Co-Authors: Adnan Iqbal, Syed Ali Khayam
    Abstract:

    In multihop wireless networks, hop-by-hop reliability is generally achieved through positive acknowledgments at the MAC Layer. However, positive acknowledgments introduce significant energy inefficiencies on battery-constrained devices. This inefficiency becomes particularly significant on high error rate channels. We propose to reduce the energy consumption during retransmissions using a novel Protocol that localizes bit-errors at the MAC Layer. The proposed Protocol, referred to as Selective Retransmission using Virtual Fragmentation (SRVF), requires simple modifications to the positive-ACK-based reliability mechanism but provides substantial improvements in energy efficiency. The main premise of the Protocol is to localize bit-errors by performing partial checksums on disjoint parts or virtual fragments of a packet. In case of error, only the corrupted virtual fragments are retransmitted. We develop stochastic models of the Simple Positive-ACK-based reliability, the previously-proposed Packet Length Optimization (PLO) Protocol, and the SRVF Protocol operating over an arbitrary-order Markov wireless channel. Our analytical models show that SRVF provides significant theoretical improvements in energy efficiency over existing Protocols. We then use biterror traces collected over different real networks to empirically compare the proposed and existing Protocols. These experimental results further substantiate that SRVF provides considerably better energy efficiency than Simple Positive-ACK and Packet Length Optimization Protocols.

  • srvf an energy efficient Link Layer Protocol for reliable transmission over wireless sensor networks
    International Conference on Communications, 2008
    Co-Authors: Adnan Iqbal, K Shahzad, Syed Ali Khayam
    Abstract:

    The 802.15.4 WSN standard provides optional reliability through positive acknowledgments. Since positive-ACKs are not designed for energy efficiency, there is significant room for improvement in the energy usage of reliable 802.15.4. In this paper, we propose a new reliable Link Layer Protocol, referred to as the Selective Retransmission using Virtual Fragmentation (SRVF) Protocol. SRVF requires simple modifications to reliable 802.15.4, but provides substantial improvements in energy efficiency. The main premise of the proposed Protocol is to localize bit-errors by performing partial checksums on disjoint parts or virtual fragments of a packet. In case of error, only the corrupted virtual fragments are retransmitted. We analytically model reliable 802.15.4 and SRVF as Markov chains operating over an arbitrary-order Markov wireless channel, and show that SRVF provides significant theoretical improvements over reliable 802.15.4. We then use bit-error traces collected over a real sensor network testbed to experimentally evaluate the two reliable Protocols. These experimental results show that SRVF has consistently and considerably better energy efficiency than the reliable 802.15.4.

  • ICC - SRVF: An Energy-Efficient Link Layer Protocol for Reliable Transmission over Wireless Sensor Networks
    2008 IEEE International Conference on Communications, 2008
    Co-Authors: Adnan Iqbal, K Shahzad, Syed Ali Khayam
    Abstract:

    The 802.15.4 WSN standard provides optional reliability through positive acknowledgments. Since positive-ACKs are not designed for energy efficiency, there is significant room for improvement in the energy usage of reliable 802.15.4. In this paper, we propose a new reliable Link Layer Protocol, referred to as the Selective Retransmission using Virtual Fragmentation (SRVF) Protocol. SRVF requires simple modifications to reliable 802.15.4, but provides substantial improvements in energy efficiency. The main premise of the proposed Protocol is to localize bit-errors by performing partial checksums on disjoint parts or virtual fragments of a packet. In case of error, only the corrupted virtual fragments are retransmitted. We analytically model reliable 802.15.4 and SRVF as Markov chains operating over an arbitrary-order Markov wireless channel, and show that SRVF provides significant theoretical improvements over reliable 802.15.4. We then use bit-error traces collected over a real sensor network testbed to experimentally evaluate the two reliable Protocols. These experimental results show that SRVF has consistently and considerably better energy efficiency than the reliable 802.15.4.