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Showing papers on "IP Multimedia Subsystem published in 2017"


Journal ArticleDOI
TL;DR: This paper proposes a graph neural network-based algorithm which exploits VNF forwarding graph topology information to predict future resource requirements for each VNF component (VNFC).
Abstract: Network functions virtualization (NFV) continues to gain attention as a paradigm shift in the way telecommunications services are deployed and managed. By separating network function from traditional middleboxes, NFV is expected to lead to reduced capital expenditure and operating expenditure, and to more agile services. However, one of the main challenges to achieving these objectives is how physical resources can be efficiently, autonomously, and dynamically allocated to virtualized network function (VNF) whose resource requirements ebb and flow. In this paper, we propose a graph neural network-based algorithm which exploits VNF forwarding graph topology information to predict future resource requirements for each VNF component (VNFC). The topology information of each VNFC is derived from combining its past resource utilization as well as the modeled effect on the same from VNFCs in its neighborhood. Our proposal has been evaluated using a deployment of a virtualized IP multimedia subsystem, and real VoIP traffic traces, with results showing an average prediction accuracy of 90%, compared to 85% obtained while using traditional feed-forward neural networks. Moreover, compared to a scenario where resources are allocated manually and/or statically, our technique reduces the average number of dropped calls by at least 27% and improves call setup latency by over 29%.

82 citations


Journal ArticleDOI
TL;DR: The paper proposes a comprehensive framework for multimedia social network, and realized a cross-platform MSN prototype system, named as CyVOD, to support two kinds of DRM modes.
Abstract: How to comprehensively explore, improve and deploy multimedia social networks (MSNs) has become a hot topic in the era of emerging pervasive mobile multimedia. More and more MSNs offer a great number of convenient tools, services, and applications for multimedia contents including video and audio that users share willingly and on demand. However, concerns with digital rights management (DRM)-oriented multimedia security, as well as the efficiency of multimedia usage and sharing are meanwhile intensified due to easier distribution and reproduction of multimedia content in a wide range of social networks. The paper proposes a comprehensive framework for multimedia social network, and realized a cross-platform MSN prototype system, named as CyVOD, to support two kinds of DRM modes. The proposed framework effectively protects copyrighted multimedia contents against piracy, and supports a more efficient recommendation system for its better handling of the tradeoff between multimedia security and ease of use.

74 citations


Journal ArticleDOI
TL;DR: In this article, the authors proposed a dynamic scaling system for geo-distributed VNF service chains, using the case of an IP multimedia subsystems (IMSs), which caters to key control-plane and data-plane service chains in an IMS, combining proactive and reactive approaches for timely, cost-effective scaling of the service chains.
Abstract: The emerging paradigm of network function virtualization advocates deploying virtualized network functions (VNFs) on standard virtualization platforms for significant cost reduction and management flexibility. There have been system designs for managing dynamic deployment and scaling of VNF service chains within one cloud datacenter. Many real-world network services involve geo-distributed service chains, with prominent examples of mobile core networks and IP multimedia subsystems (IMSs)). Virtualizing these service chains requires efficient coordination of dynamic VNF deployment across geo-distributed data centers, calling for a new management system. This paper designs a dynamic scaling system for geo-distributed VNF service chains, using the case of an IMS. IMSs are widely used subsystems for delivering multimedia services among mobile users in a 3G/4G network, whose virtualization has been broadly advocated in the industry for reducing cost, improving network usage efficiency and enabling dynamic network topology reconfiguration for performance optimization. Our scaling system design caters to key control-plane and data-plane service chains in an IMS, combining proactive and reactive approaches for timely, cost-effective scaling of the service chains. The design principles are applicable to scaling of other systems with multiple related service chains. We evaluate our system using real-world experiments on both an emulation platform and a geo-distributed public cloud.

29 citations


Patent
09 Nov 2017
TL;DR: In this paper, a network-based solution of supporting IP multimedia subsystem (IMS) call setup in a next generation system (5GS) is proposed, where during an attach or registration area update procedure, a serving base station sends an indication to a UE indicating whether IMS voice over PS session is supported or not.
Abstract: A network-based solution of supporting IP multimedia subsystem (IMS) call setup in a next generation system (5GS) is proposed. During an attach or registration area update procedure, a serving base station sends an indication to a UE indicating whether IMS voice over PS session is supported or not. Upon receipt of the indication that IMS VoPS is supported, the UE triggers an IMS registration procedure. However, when an MO/MT call happens, the network determines that the UE may be in conditions where voice service is not supported because the network is not able to provide a successful IMS VoPS over the current serving cell connected to 5G core network. The network then triggers a RAT change or a EPS fallback procedure such that the UE is handover to a target cell that supports IMS VoPS.

26 citations


Journal ArticleDOI
TL;DR: A simple method to estimate handover delay for IMS-based systems with heterogeneous access networks and it has been shown that handover process to UMTS access network tends to be much longer than that of WLAN access network.
Abstract: IP multimedia subsystem (IMS) is an architectural framework designed to merge the Internet and cellular networks, as such users can have access to the current and future services available over the Internet with their mobile devices anytime and virtually everywhere at affordable charges and faster rates, but heterogeneity of access networks in IMS-based systems makes handover process to be a critical issue, especially when moving from one access network to another access network with different technology, hence there is a need to devise a simple approach to estimate handover delay when moving to any access network. This paper proposes a simple method to estimate handover delay for IMS-based systems with heterogeneous access networks. The proposed method can be used to estimate handover delay for current and future access networks, but for illustration purpose, in the paper two access networks were considered, i.e. UMTS and WLAN. Numerical analysis conducted in the paper has shown that handover process to UMTS access network tends to be much longer than that of WLAN access network.

16 citations


Journal ArticleDOI
TL;DR: This paper shows how to efficiently synchronize the broadcasting server and the multimedia players and how to reduce service latency by limiting the multimedia player buffer length and a case study is simulated to confirm how the quality of the multimedia service is improved by applying these proposals.
Abstract: Multimedia services over mobile networks pose several challenges, such as the efficient management of radio resources or the latency induced by network delays and buffering requirements on the multimedia players. In Long Term Evolution (LTE) networks, the definition of multimedia broadcast services over a common radio channel addresses the shortage of radio resources but introduces the problem of network error recovery. In order to address network errors on LTE multimedia broadcast services, the current standards propose the combined use of forward error correction and unicast recovery techniques at the application level. This paper shows how to efficiently synchronize the broadcasting server and the multimedia players and how to reduce service latency by limiting the multimedia player buffer length. This is accomplished by analyzing the relation between the different parameters of the LTE multimedia broadcast service, the multimedia player buffer length, and service interruptions. A case study is simulated to confirm how the quality of the multimedia service is improved by applying our proposals.

16 citations


Proceedings ArticleDOI
01 Sep 2017
TL;DR: The article analyzes the functioning of the IMS core in solving the problems of conjugation of transport and signal flows and proposes a model that allows to calculate the volume of incoming traffic from heterogeneous networks and its value after conversion to a standard form in accordance with the requirements ofThe IMS architecture.
Abstract: Solving the problems of convergence networks of various technologies, ensuring their compatibility at the level of control, signaling and traffic flows is connected with bringing the networks in compliance with the requirements of the IMS (IP Multimedia Subsystem) architecture. In the process of network pairing, two main tasks must be solved. The first is the interconnection of networks of different technologies for signaling. The second task is to ensure the interaction of networks at the level of traffic flows. When solving the first task, all kinds of signaling are transferred to the use of the SIP protocol. And when solving the second task, all types of transport streams are transferred to the stack protocols of IP network. All pairing tasks are addressed at the element management level CSCF (Call Session Control Function), P-CSCF (Proxy Call Session Control Function), I-CSCF (Interrogating CSCF), S-CSCF (Serving-CSCF). When designing the IMS management layer, it is necessary to determine the amount of traffic that will be served by CSCF elements. And then calculate the necessary performance of the branches of the telecommunications network to handle the signal and transport load. The article analyzes the functioning of the IMS core in solving the problems of conjugation of transport and signal flows. A list of the main elements involved in the management process has been determined. A model is proposed that allows to calculate the volume of incoming traffic from heterogeneous networks and its value after conversion to a standard form in accordance with the requirements of the IMS architecture. The requirements for the telecommunications component of the IMS architecture are defined.

11 citations


Proceedings ArticleDOI
01 Apr 2017
TL;DR: The paper shows how it has been designed and implemented an elastic IMS-compliant solution by exploiting the widespread Asterisk server as media gateway and demonstrates the fully feasibility of the approach adopted and explained in this paper.
Abstract: Many recent projects and research activities in the telco sector are adopting the Cloud Computer paradigm consolidating their infrastructures towards converged and all-IP next generation networks providing typical telco services within LTE (and soon 5G) and also fixed network environments, e.g., often still adopting IP Multimedia Subsystem (IMS) architecture solutions. In this perspective, cloud computing can significantly lower investment risks by implementing telco services with Virtual Network Functions (VNFs) on top of a Network Functions Virtualization (NFV) Infrastructure. Within this general context, this paper presents the implementation and integration work accomplished within the large EU FP7 Mobile Cloud Networking project (MCN, 2013-2016) to achieve cost-effective elasticity of IMS-based multimedia applications. The paper shows how it has been designed and implemented an elastic IMS-compliant solution by exploiting the widespread Asterisk server as media gateway. Quality monitoring and scale in/out triggering are obtained through the interaction between the MCN Monitoring as a Service (MaaS) and OpenBaton, i.e., a novel open-source NFV Orchestrator (NFVO) integrated in MCN and fully compliant with the ETSI NFV Management and Orchestration (MANO) specifications. The collected performance results of the proposed solution, demonstrates the fully feasibility of the approach adopted and explained in this paper.

11 citations


Journal ArticleDOI
TL;DR: The paper will shed light on both the design and the implementation of the Kerberos system, whose performance is then evaluated by relying on a real-world dataset of Call Detail Record (CDR) events provided by Tiscali, a well known Italian Operator.

8 citations


Journal ArticleDOI
25 May 2017
TL;DR: The present state of the art establishes the basis for studying differentMechanisms to provide end-to-end Quality of Service on a network over the IP Multimedia Subsystem.
Abstract: The present state of the art establishes the basis for studying differentmechanisms to provide end-to-end Quality of Service on a network overthe IP Multimedia Subsystem (IMS). Unlike traditional networks whichensure QoS individually depending on the service provided, IMS seeksthe convergence of fixed and mobile services with Quality of Servicethrough a set of policies defined by operators and Service Level Agreementsestablished with their users.

8 citations


Proceedings ArticleDOI
01 Nov 2017
TL;DR: The results show that the scheme reduces latencies and failure recovery time upto 12X and 10X, respectively, when compared to the stat-of-the-art 3GPP compliant virtualized IMS implementation.
Abstract: Network Functions Virtualization (NFV) allows service providers to deliver new services to their customers more quickly by adopting software centric network functions implementation over commercial, off-the-shelf hardwares. IP Multimedia Subsystem (IMS) which is one of the most complex NFV instances requires extremely low end-to-end latency (up to 40 msec), and demands system availability as high as five nines. We discover that highly modular 3GPP standardized IMS network functions implementation over virtualized platform (1) incurs latencies, and (2) does not tolerate faults. NFV-based IMS modules incur high latencies by creating a feedback loop among each other while executing delay sensitive data-plane traffic. These IMS modules are also susceptible to failures, causing the control-plane to terminate the application session while keeping the data-plane to forward data packets. To address these issues, we propose to refactor network function modules. We reduce latencies by pipelining the communication between IMS modules, and achieve fault tolerance by reconfiguring their neighboring modules. We build our system prototype of open source 3GPP compliant IMS over OpenStack platform. Our results show that our scheme reduces latencies and failure recovery time upto 12X and 10X, respectively, when compared to the stat-of-the-art 3GPP compliant virtualized IMS implementation.

Book ChapterDOI
01 Jan 2017
TL;DR: The experimental result demonstrates that the recommended technique contributes significant security to video streams while maintaining the original video compression efficiency and compression ratio.
Abstract: Video compression method such as H.264/AVC often causes huge computing complexity at the encoder that is generally implemented in various multimedia applications. In view of this an article on selective video encryption framework based upon Advanced Encryption Standard (AES) is suggested for prioritized frames of H.264/AVC to improve the multimedia security while maintaining the low complexity at the encoder. The experimental result demonstrates that the recommended technique contributes significant security to video streams while maintaining the original video compression efficiency and compression ratio. Moreover, the proposed scheme provides a good trade-off between encryption robustness, flexibility, and real-time processing.

Proceedings ArticleDOI
21 Nov 2017
TL;DR: The results show that the system prototype of open source IMS over cloud platform can achieve session-level resilience by performing fail-over procedure within tens of milliseconds under different combinations of IMS control-plane operations failures.
Abstract: IMS (IP Multimedia Subsystem) is an emerging architectural framework that delivers a number of multimedia services -- ranging from voice/video over LTE, interactive gaming and many more -- in operational LTE network. Network operators are embracing cloud-based IMS to meet increasing multimedia traffic demand. They can easily and cost-efficiently implement multimedia applications while ensuring superior end-user experiences through always-on services and real-time engagement. In this paper, we reveal that cloud-based IMS cannot provide session-level resilience under faults and becomes the bottleneck to high service availability. The root cause lies upon the weak failure recovery mechanisms at both IMS protocol and cloud platform that terminate the on-going IMS control-plane procedure. To address this, we propose a design that provides fault-tolerance to IMS control-plane operations. Our design provides modular redundancy to perform real time failure recovery. As the system operates, the control-plane operations are logged at redundant IMS NFs modules. These logs are replayed from the failed operation to resume IMS working after failure. We build our system prototype of open source IMS over cloud platform. Our results show that we can achieve session-level resilience by performing fail-over procedure within tens of milliseconds under different combinations of IMS control-plane operations failures.

Proceedings ArticleDOI
01 May 2017
TL;DR: A new architecture SDN-based for LTE packet core to enhance the QoS management and is implemented and evaluated for a Video on Demand (VoD) by testing the Quality of Experience (QoE) in terms of the Video Mean Opinion Score (VMOS).
Abstract: The outstanding advances in computing as well as the explosion of devices and services requirements are making communication mobile networking more and more complex to manage. In addition, multimedia services such as provided by the IP Multimedia Subsystem (IMS) require a dynamic Quality of Service (QoS) management. However, traditional Long Term Evolution (LTE) networking approaches have become too closed and limited in terms of providing Quality of Service (QoS). For this purpose, it has been necessary to look for new approaches. Among these approaches is the integration of the Software Defined Network (SDN) in the LTE network. With this approach the LTE mobile network will benefit from the SDN features to separate the control plane from the data plane and to enable a dynamic configuration of network resources and then a flexible QoS management. This paper presents a new architecture SDN-based for LTE packet core to enhance the QoS management. The architecture is implemented and evaluated for a Video on Demand (VoD) by testing the Quality of Experience (QoE) in terms of the Video Mean Opinion Score (VMOS).

Proceedings ArticleDOI
21 Jul 2017
TL;DR: This work proposes a new approach for the adaptive management of the IPsec protocol for IMS architectures, called Smart Adaptive Security for I MS, an acronym for SAS-IMS.
Abstract: IP Multimedia Subsystem (IMS) is a standardized Next Generation Network (NGN) architecture, used to provide users access to different services even in case of roaming. Although this architecture is deployed in cellular (mobile) networks, the latter represents several limitations, notably in terms of security. To overcome this inadequacy, IPsec protocol can be deployed between user equipment (UE) and Proxy Call Session Control Functions (P-CSCF). This solution has certain limitations in terms of reliability, i.e. the same security policy deployed between UE and P-CSCF will be applied to any type of the client traffic. In other words, if network performances are critical and the security policy deployed requires high processing, the transported traffic of real-time characteristic will suffer from a quality deterioration. In this work, we propose a new approach for the adaptive management of the IPsec protocol for IMS architectures, called Smart Adaptive Security for IMS, an acronym for SAS-IMS.

Patent
30 Jun 2017
TL;DR: In this paper, a voice service realization method and device based on an IMS (IP Multimedia Subsystem) is presented, which comprises the steps of receiving a first service registration request initiated by a user terminal; cancelling second service if the second service corresponding to an IEMS account is registered; and informing the user terminal to cancel the second services corresponding to the IMS account.
Abstract: The embodiment of the invention provides a voice service realization method and device based on an IMS (IP Multimedia Subsystem). The method comprises the steps of receiving a first service registration request initiated by a user terminal; cancelling second service if the second service corresponding to an IMS account is registered; receiving a first service cancellation request initiated by the user terminal; and informing the user terminal to cancel the second service corresponding to the IMS account. According to the embodiment of the invention, the registration request initiated by the user terminal is received through an MMTel AS (Multi Media Telephony Application Server) in an IMS core network; different pieces of voice service requested to be registered by the user terminal correspond to the same IMS account, so the MMTel AS cancels the other voice service registered by the user terminal according to the IMS account, the voice service capable of being registered by the user terminal is guaranteed to be online alternately, and the conflict of service as IMS registration and calling is avoided when the VoLTE (Voice over Long Term Evolution) service and VoWiFi (Voice over Wireless-Fidelity) service of the same user terminal are registered at the same time.

Patent
18 Jul 2017
TL;DR: In this paper, a VOLTE (Voice Over LTE) signaling acquisition and service correlation method and apparatus is described, which includes the steps of setting acquisition interfaces which at least include a plurality of interfaces of an IMS (IP Multimedia Subsystem) domain, an EPC (Evolved Packet Core) domain and a pluralityof interfaces of a CS (Circuit Switch) domain; and according to the networking mode, selecting a corresponding mirror image method or light splitting acquisition method or a TAP (Testing Access Point) acquisition method to perform VOLTE signaling acquisition on the
Abstract: The invention discloses a VOLTE (Voice Over LTE) signaling acquisition and service correlation method and apparatus. The VOLTE signaling acquisition and service correlation method includes the steps: setting acquisition interfaces which at least include a plurality of interfaces of an IMS (IP Multimedia Subsystem) domain, a plurality of interfaces of an EPC (Evolved Packet Core) domain and a plurality of interfaces of a CS (Circuit Switch) domain; setting acquisition positions which at least include an SBC (Session Border Controller), a DRA (Diameter Routing Agent), an MME (Mobile Management Entity), a eMSC (evolved Mobile Switching Center), an MSC (Mobile Switching Center), I/S-CSCF (Interrogating/Serving Call Session Control Function) and MGCF (Media Gateway Control Function); according to the networking mode, selecting a corresponding mirror image method or a light splitting acquisition method or a TAP (Testing Access Point) acquisition method to perform VOLTE signaling acquisition on the corresponding acquisition interface at the acquisition position; and based on the VOLTE signaling, performing VOLTE registration service association and VOLTE call service association.


Proceedings ArticleDOI
14 Nov 2017
TL;DR: The main goal is to design a combined architecture in a virtualized environment for dynamic delivery of services with quality of service (QoS) and improved resource performance so as to meet the purposes of the 5G network in terms of a proposed, virtual telecom environment managed and orchestrated by the conjunction of the aforementioned paradigms.
Abstract: Telecom professionals have a strong interest in the proposition and adaptation of innovate network management models and frameworks to help mobile network operators (MNOs) to improve their business processes and get more agile in the telecoms industry that evolves with great speed. The model being established by the TeleManagement Forum (TM Forum) is the Enhanced Telecom Operations MAP (eTOM) business process framework on which we rely in this work to propose a mapping of the eTOM model onto the network functions virtualization (NFV) framework with the projection of this function mapping onto the IP Multimedia Subsystem (IMS) use case. This mapping covers essentially four main components playing important rules in the MNO's business processes, including customers, services, infrastructure resources, and also service providers. The main goal, thereby, is to design a combined architecture in a virtualized environment for dynamic delivery of services with quality of service (QoS) and improved resource performance so as to meet the purposes of the 5G network in terms of a proposed, virtual telecom environment managed and orchestrated by the conjunction of the aforementioned paradigms. Indeed, we conducted simulations to evaluate part of this function mapping in an IMS setting for static service chain provisioning. Thus, results showed possible provisioning of services in this context in measuring SIP related key performance indicators and performance metrics. Results showed the feasibility of our approach. In addition, resource performance improved obviously in the NFV context in accordance with eTOM business processes.

Proceedings ArticleDOI
01 May 2017
TL;DR: An extended architectural framework of the 4G LTE system is proposed by merging the IMS platform and Hadoop modules for the purposes of both the distributed storage of IMS service resources and the computing service that is suggested in this study for meeting future mobile consumers' needs in mobile computing terms.
Abstract: The mobile network operators (MNOs) that are deploying the IP Multimedia Subsystem (IMS) experience rapid growth of mobile contents and mobile subscribers' requests. Consequently, system performance could be affected and the management of different types of content resources gets expensive and gradually harder. In fact, with the emergence of the big data technology, MNOs must think of making the most of it to introduce new big data based value-added services and ameliorate the IMS system performance and management. In this paper, we propose an extended architectural framework of the 4G LTE system by merging the IMS platform and Hadoop modules for the purposes of both the distributed storage of IMS service resources and the computing service that is suggested in this study for meeting future mobile consumers' needs in mobile computing terms. During experiments, we evaluate the quality of both the system and service. As a result, the propounded architectural framework improves server utilization and quality of service slightly varies.

Book ChapterDOI
17 Sep 2017
TL;DR: The results of calculations using PH/PH/1 queuing systems are presented, in which arrival and service distributions are phase-type distributions computed using maximum likelihood and distance minimization fitting algorithms based on experimental histograms.
Abstract: The paper describes our further research done with the proposed analytical and simulation traffic models of the Next Generation Network (NGN), which is standardized for delivering multimedia services with strict quality and includes elements of the IP Multimedia Subsystem (IMS). The aim of our models of a single IMS/NGN domain is to evaluate two standardized call processing performance parameters, which appropriate values are very important for satisfaction of users and overall success of the IMS/NGN concept. These parameters are mean Call Set-up Delay E(CSD) and mean Call Disengagement Delay E(CDD). Our latest investigations concern improving the conformity of the analytical results and experimental results obtained using the simulation model, which implements the operation of real network elements according to current standards and research. In this paper the results of calculations using PH/PH/1 queuing systems are presented, in which arrival and service distributions are phase-type distributions computed using maximum likelihood and distance minimization fitting algorithms based on experimental histograms. Presented latest results are compared to these obtained using other, previously investigated queuing systems. Additionally, computational complexity of all examined queuing systems is analyzed. As a result, some general remarks concerning all tested queuing systems and their applicability to NGN are provided.

Journal ArticleDOI
TL;DR: This paper discusses how to avoid service disruptions and reduce service latency for LTE multimedia broadcast services by adding dynamic adaptation capabilities to the unicast error recovery process.
Abstract: Multimedia services over mobile networks present several challenges, such as ensuring a reliable delivery of multimedia content, avoiding undesired service disruptions, or reducing service latency. HTTP adaptive streaming addresses these problems for multimedia unicast services, but it is not efficient from the point of view of radio resource consumption. In Long-Term Evolution (LTE) networks, multimedia broadcast services are provided over a common radio channel using a combination of forward error correction and unicast error recovery techniques at the application level. This paper discusses how to avoid service disruptions and reduce service latency for LTE multimedia broadcast services by adding dynamic adaptation capabilities to the unicast error recovery process. The proposed solution provides a seamless mobile multimedia broadcasting without compromising the quality of the service perceived by the users.

Journal ArticleDOI
TL;DR: MuSNet is the mobile device-based scheme for improving QoS and QoE of multimedia services through network performance isolation in a mobile device, which resolves the aforementioned problem by applying the concept of performance isolation to the multimedia services.
Abstract: Due to the advancement of hardware and software, today's mobile devices, such as smartphones, tablet PCs, and laptops, are capable of providing a wide range of services. Among various services, a lot of users use multimedia services on mobile devices, and the size of mobile multimedia traffic is constantly increasing. Especially, the growth of social networking services and content-sharing sites stimulates creating and sharing of multimedia contents. Such environment made it possible for today's mobile users to frequently download or upload multimedia data. Nowadays, smartphones allow users to multi-task between different services, so the multimedia service often coexists with background services in a mobile device at the same time. In these cases, the performance degradation of a multimedia service happens due to concurrently running background services in the device. In this paper, we propose MuSNet, a scheme for improving QoS and QoE of multimedia services through network performance isolation in a mobile device, which resolves the aforementioned problem by applying the concept of performance isolation to the multimedia services. MuSNet is the mobile device-based scheme without any modification on servers. Furthermore, unlike most performance isolation implemented by virtual machines, we suggest a scheme that does not require virtualization that might be heavy for mobile devices. The proposed scheme was implemented on a smartphone by modifying the kernel, and various experiments were conducted to evaluate the advanced system behavior of MuSNet.

Patent
15 Dec 2017
TL;DR: In this paper, a method for switching registration of an IP (Internet Protocol) multimedia subsystem and belongs to the technical field of communication is presented. The method is applied to a mobile terminal and comprises the steps of registering the IP multimedia subsystem through a first network, periodically detecting whether the network quality of the first network satisfies a preset video call condition or not, switching to a second network, and if the preset call condition is not satisfied, if the network type of the second network is different from the first one, registration through the second one.
Abstract: The embodiment of the invention discloses a method for switching registration of an IP (Internet Protocol) multimedia subsystem and belongs to the technical field of communication. The method is applied to a mobile terminal and comprises the steps of registering the IP multimedia subsystem through a first network; periodically detecting whether the network quality of the first network satisfies a preset video call condition or not; and if the preset video call condition is not satisfied, switching to a second network and registering the IP multimedia subsystem through the second network, wherein the network type of the second network is different from that of the first network. The embodiment of the invention also discloses a mobile terminal and a memory medium. When the quality of the first network is low, the switching is carried out automatically, the IP multimedia subsystem is registered through the second network, the video call stability is ensured, and the network switching operation convenience is improved.

Proceedings ArticleDOI
01 Jan 2017
TL;DR: In this paper, one of the merits of NFV of massive scalability in virtual networks particularly in virtual IP based multimedia subsystem (vIMS) is explored, and the effect of different control parameters used for scaling policy is studied.
Abstract: Todays telecommunication networks are plagued with ever increasing demands of scalability and service agility. Network function virtualization (NFV) potentially addresses the issue of slow scaling and reduced time to introduce new services, which are hindered in network services built up on proprietary, dedicated hardware. In this paper we explore one of the merits of NFV of massive scalability in virtual networks particularly in virtual IP based multimedia subsystem (vIMS). In our practical approach we study the effect of different control parameters used for scaling policy. Moreover, we explore the behavior of the IP based multimedia subsystem deployed on a cloud by varying levels of load and stress.

Patent
Yang Yucang, Li Yi, Lu Jun, Fan Xingyu, Chen Weiwei 
31 May 2017
TL;DR: In this paper, an embodiment of the invention provides a voice service establishing method and device and relates to the field of communications with an aim to avoid occurrence that VoLTE (voice over long term evolution) voice service fails in establishment when UE (user equipment) is determined to be located in the area where LTE network coverage is not perfect.
Abstract: An embodiment of the invention provides a voice service establishing method and device and relates to the field of communications with an aim to avoid occurrence that VoLTE (voice over long term evolution) voice service fails in establishment when UE (user equipment) is determined to be located in the area where LTE network coverage is not perfect The method includes: when VoLTE used for establishing the VoLTE voice service call is determined to be initiated, a user terminal UE sending current reference signal received power (RSRP) of the UE to an eNode B; the eNodeB rejecting IMS (IP multimedia subsystem) to establish voice carrying for the VoLTE voice service between the IMS and the UE according to the current RSRP of the UE The voice service establishing method and device is used for establishing the voice service

Journal ArticleDOI
TL;DR: Coupling the local and remote SIP‐OC schemes, it is shown that the range of ‘sustainable’ overload that can be imposed on the system improves significantly and the proposed solution is robust to network latency and SIP server capacity fluctuations.
Abstract: Summary Carriers have adopted session initiation protocol (SIP) in their next generation networks. Providing carrier-grade service requires high availability in times of component failures, avalanche restart, flash crowds and denial of service attacks, which cause overload on SIP servers. Throughput of SIP servers is largely degraded during overload. We propose an SIP overload control (SIP-OC) solution for local and remote situations, working in hop-by-hop and end-to-end modes. Our local SIP-OC method uses a cross-layer approach with negligible performance impact, while the implicit nature of our remote SIP-OC allows detection of sophisticated overload conditions such as those caused by non-SIP entities. Our remote SIP-OC uses transaction response time as the basis for implicit overload detection. Coupling our local and remote SIP-OC schemes, we show that the range of ‘sustainable’ overload that can be imposed on the system improves significantly. Moreover, incorporating a 2-means filtering mechanism into our SIP-OC scheme makes it perform well under packet-loss. We also show that our proposed solution is robust to network latency and SIP server capacity fluctuations. All of our results are obtained from experiments over SIP testbeds including an experimental IP multimedia subsystem. Copyright © 2016 John Wiley & Sons, Ltd.

Patent
01 Sep 2017
TL;DR: In this article, a method for automatically switching a WLAN (Wireless Local Area Network) and an LTE (Long Term Evolution) network and a communication terminal is presented, which comprises the steps of receiving signal measurement parameters reported by the WLAN and the LTE network; obtaining preset information of a network priority, wherein the network priority is used for identifying the network preferentially used for bearing IMS (IP Multimedia Subsystem) communication service.
Abstract: The invention discloses a method for automatically switching a WLAN (Wireless Local Area Network) and an LTE (Long Term Evolution) network and a communication terminal. The method comprises the steps of receiving signal measurement parameters reported by the WLAN and the LTE network; obtaining preset information of a network priority, wherein the network priority is used for identifying the network preferentially used for bearing communication service when the WLAN and the LTE network coexist; and performing switching operation according to the signal measurement parameters and the preset information of network priorities. According to the method and the communication terminal, the network with relatively good network condition in the WLAN and the LTE network can be automatically selected for bearing IMS (IP Multimedia Subsystem) communication service, the communication service quality can be ensured, and the network connection efficiency can be improved.

Proceedings ArticleDOI
01 Nov 2017
TL;DR: A new PHB (Per-Hop Behavior) is presented that reclassifies and differentiates IPTV sub traffics by using the IPv6 Flow Label field and will make possible prioritization of sub traffic according to the applied QoS network policy.
Abstract: The latest experiences hint that the QoS (Quality of Service) approaches adopted by IMS (IP Multimedia Subsystem) technologies are still suffering from a primary containment factor due to the nondifferentiation between IPTV (Internet Protocol Television) video components. The success of IPTV services depends on how the customer perceives QoS related to the provided stream. The satisfaction of this factor is crucial to the success of IMS services. This need constitutes a major challenge for the IMS-based IPTV on the horizon of overcoming the failure of existing QoS models namely IntServ and DiffServ. This paper presents a new PHB (Per-Hop Behavior) that reclassifies and differentiates IPTV sub traffics by using the IPv6 Flow Label field. The proposed PHB will make possible prioritization of sub traffic according to the applied QoS network policy. We also suggest the use of OPNET software to implement IMS-Based IPTV scenarios. Results show that the proposed PHB works well and the Video packet losses vary according to the type of IPTV service used by the user.

Journal ArticleDOI
TL;DR: Improvements in the area of location information transport based on the Session Initiation Protocol (SIP) are proposed, primarily related to reducing the necessary amount of signaling with the specification of a new type of location filter.
Abstract: The IP Multimedia Subsystem (IMS), specified by the 3rd Generation Partnership Project (3GPP), is a key element in the next-generation network (NGN) converged architecture. Extending the IMS towards provisioning support for location based services (LBS) will enable enhanced services and offer new revenues to the operator. Conveying location information in the IMS and connecting the IMS with a positioning system are still open issues. This paper presents the design and implementation of an IMS Location Server (ILS) integrating IMS with a positioning system. From the IMS perspective, the ILS serves as a service enabler for LBS. In order to demonstrate proof-of-concept in enhancing IMS-based services, two prototype service scenarios have been implemented: Location-aware Messaging (LaM), and Location-aware Push-to-Talk over cellular (LaPoC). Some work has been done by the IETF in the area of location information transport based on the Session Initiation Protocol (SIP). This paper proposes improvements in this area, primarily related to reducing the necessary amount of signaling with the specification of a new type of location filter. We have conducted measurements in a laboratory environment in order to illustrate our proposed solution and verify the benefits compared to existing solutions in terms of traffic load and session establishment time. Furthermore, we present a case study integrating the ILS with the Ericsson Mobile Positioning System (MPS).