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Brian Bidulock – One of the best experts on this subject based on the ideXlab platform.

  • Registration Extensions (REGEXT) for Signalling User Adaptation Layers
    , 2007
    Co-Authors: Brian Bidulock
    Abstract:

    This memo describes Registration Extensions (REGEXT) that provides the ability for an Application Server Process (ASP) to modify existing Routing (Link) Keys with a Signalling Gateway (SG). Current procedures in the SS7 Signalling User Adaptation Layers (UAs) [M2UA], [M3UA], [SUA], [ISUA], [TUA] do not provide for the modification of Routing (Link) Keys without deactivation of the Application Server (AS). This causes problems in making changes to live systems. The extensions described in this memo permit modification of Signalling Link membership in Application Servers for SS7 MTP2-User Adaptation Layer [M2UA], modification of Circuit Identification Code (CIC) ranges for the SS7 MTP3-User Adaptation Layer [M3UA], modification of Circuit Identification Code (CIC) ranges for the SS7 ISUP-User Adaptation Layer [ISUA], modificiation of Destination Local Reference (DLR) ranges for SS7 SCCP-User Adaptation Layer [SUA], and modification of Transaction Identifier (TID) ranges for SS7 TCAP-User Adaptation Layer [TUA].

  • SS7 MTP2-User Adaptation Layer (M2UA) SS7 Test Specifications M2UA-SS7TEST
    , 2007
    Co-Authors: Brian Bidulock
    Abstract:

    This Internet-Draft provides information for the Internet community on the implementation of test cases for testing the SS7 MTP2-User Adaptation Layer [M2UA] Signalling Gateway (SG) based on the conformance test specifications for SS7 MTP Level 2 [Q.780], [Q.781], [M2PATEST07].

  • SS7 MTP2-User Peer-to-Peer Adaptation Layer Test Specifications M2PA-TEST
    , 2007
    Co-Authors: Brian Bidulock
    Abstract:

    This Internet Draft provides information for the Internet community on test cases for testing the SS7 MTP2-User Peer-to-Peer Adaptation Layer [M2PA] based on the conformance test specifications for SS7 MTP Level 2 [Q.781]. This memo describes the test environment and a detailed description of test cases for validation, compatibility and interoperability testing of the M2PA protocol implemented on the foundation of ITU SS7 MTP Signalling Links [Q.703].

Georg Carle – One of the best experts on this subject based on the ideXlab platform.

  • Towards scaleable error control for reliable multipoint services in ATM networks
    , 1996
    Co-Authors: Georg Carle
    Abstract:

    Advanced applications, such as distributed multimedia applications, require efficient communication subsystems providing a variety of services. Existing communication systems face increasing difficulties in fulfilling these requirements. In particular, the efficient provision of reliable group communication services in ATM-Networks remains a major unresolved issue. This paper presents a novel framework for Adaptation Layer error control mechanisms. Two Adaptation Layer protocols are presented that provide reliable multicast services. The first one, called RLMCP (Reliable Lightweight Multicast Protocol), is a simple and efficient Adaptation Layer protocol for the Service Specific Convergence SubLayer of AAL5. It uses a frame-based ARQ-scheme and is suitable for virtual connections with low cell loss rates. The second one, called RMCAAL (Reliable Multicast ATM Adaptation Layer), features cell-based ARQ in combination with FEC. The framework permits to select the combination of error control mechanisms most suitable for the application requirements in a specific communication scenario. The achievable performance is analysed, identifying the influence of group size, cell loss rate and path capacity on throughput and delay. Guidelines are presented for selection of the error control scheme most appropriate for a specific communication scenario.

  • High-Speed Networking for Multimedia Applications – High performance group communication services in ATM networks
    High-Speed Networking for Multimedia Applications, 1996
    Co-Authors: Georg Carle, Stefan Dresler
    Abstract:

    Advanced applications, such as distributed multimedia applications, require efficient communication subsystems providing a variety of services. Existing communication systems face increasing difficulties in fulfilling these requirements. In particular, the efficient provision of reliable group communication services in ATM-Networks remains a major unresolved issue. This paper presents a novel framework for support of multipoint communication in ATM networks. Two Adaptation Layer protocols are presented that provide reliable multicast services. The first one, called RLMCP (Reliable Lightweight Multicast Protocol), is a simple and efficient Adaptation Layer protocol for the Service Specific Convergence SubLayer of AAL5. It uses a frame-based ARQ scheme and is suitable for virtual connections with low cell loss rates. The second one, called RMC-AAL (Reliable Multicast ATM Adaptation Layer), features cell-based ARQ and cell-based FEC. A new network element, called the Group Communication Server (GCS), is presented for implementing the Adaptation Layer protocols in network nodes. It allows for hierarchical multicast error control and support of heterogeneous scenarios. The framework permits to select the combination of error control mechanisms most suitable for the requirements of a specific communication scenario. The functionality of end systems and group communication servers is described, and a basic implementation architecture is presented. Based on this architecture, approximations for the processing delays are presented when the different error control schemes are applied. Finally, the influence of the different error control schemes onto the selection of an appropriate memory management strategy is investigated.

  • Error Control for Reliable Multipoint Communication in ATM Networks
    , 1994
    Co-Authors: Georg Carle
    Abstract:

    A new framework for support of reliable multipoint communication in ATM networks is presented. It is based on a new Adaptation Layer type, called the Reliable Multicast ATM Adaptation Layer (RMC-AAL), and on a new network element, called the Group Communication Server (GCS). A set of error control mechanisms tailored for multipoint communication are integrated into RMC-AAL and GCS. Error control is based on ARQ and FEC schemes, allowing to select the mechanism that is most suitable for the application requirements in a specific communication scenario. The functionality of Adaptation Layer and group communication server are described, a basic implementation architecture is presented, and results of a performance evaluation are given.

Wang Neng – One of the best experts on this subject based on the ideXlab platform.

  • Conformance Test of 6LoWPAN Adaptation Layer Protocol
    Computer Engineering, 2008
    Co-Authors: Wang Neng
    Abstract:

    Test cases and test platform are designed for conformance testing of 6LoWPAN Adaptation Layer protocol. Based on analyses of 6LoWPAN Adaptation Layer protocol, test purposes are grouped and created. Nearly 100 test cases are designed for these test purposes. To conduct test cases, a test platform is developed to send stimuli and observe the behavior of the system under test. The conformability of the Adaptation Layer implementation is achieved by using more than 90 of these test cases.

Jon Crowcroft – One of the best experts on this subject based on the ideXlab platform.

  • SEAL detects cell misordering
    IEEE Network, 1992
    Co-Authors: Zheng Wang, Jon Crowcroft
    Abstract:

    The performance of a 32 bit cyclic reduredundancyck (CRC) for detecting cell misordering in an asynchronous transfer mode Adaptation Layer, called simple and efficient Adaptation Layer (SEAL), is discussed. It is shown that 32 bit CRC used in SEAL provides robust detection of cell misordering. For any frame size up to 4 Gb, the probability of undetected misordering is 2/sup -32/. >

Nor Kamariah Noordin – One of the best experts on this subject based on the ideXlab platform.

  • Development of 6LoWPAN Adaptation Layer with Fragmentation and Reassembly Mechanisms by Using Qualnet Simulator
    Informatics Engineering and Information Science, 2011
    Co-Authors: Chiaw Wei Chan, Fazirulhisyam Hashim, Nor Kamariah Noordin
    Abstract:

    This paper presents the development of 6LoWPAN Adaptation Layer with fragmentation and reassembly mechanisms by using Qualnet simulator. The developed Adaptation Layer is based on 6LoWPAN working group specifications and is added into the current existing Qualnet libraries. The IPv6 protocol stacks, however, are not currently supported and provided by Qualnet simulator. Thus, a modified version of IPv4 based addressing scheme to emulate the IPv6 protocol stacks for developing the 6LoWPAN Adaptation Layer has been successfully implemented and validated in Qualnet simulator. This developed Adaptation Layer has also been examined over the IEEE 802.15.4 standard WSN environment. The performance of the developed 6LoWPAN is evaluated and compared to WSN in terms of packet delivery ratio, throughput, average end-to-end delay and total average energy consumption.

  • APCC – The effect of fragmentation and header compression on IP-based sensor networks (6LoWPAN)
    The 17th Asia Pacific Conference on Communications, 2011
    Co-Authors: Farhad Mesrinejad, Nor Kamariah Noordin, Fazirulhisyam Hashim, Mohd Fadlee A. Rasid, Raja Syamsul Azmir Raja Abdullah
    Abstract:

    Internet Protocol version 6 (IPv6) over Low-power Personal Area Network (6LoWPAN) is proposed by the Internet Engineering Task Force (IETF) working group to accomplish the concept of IP-based Wireless Sensor Network (WSN). A new Layer is incorporated between IPv6 network Layer and 802.15.4 MAC Layer, which is entitled Adaptation Layer. Header compression, packet fragmentation, and Layer two forwarding are the main tasks of the Adaptation Layer. An IPv6 packet is too big regarding to the Maximum Transmission Unit (MTU) size of 802.15.4 standard thus it has to be fragmented. Breaking up a big packet to number of small fragments and attaching new headers to each fragment may affect the energy level. In this paper, we place an attention on the impact of the Adaptation Layer on the energy consumption of a 6LoWPAN sensor node. From our analysis, we found that the Adaptation Layer, in particular the fragmentation process may increase the energy consumption of a sensor node by 5 to 10 percent.