Showing papers on "IP Multimedia Subsystem published in 2021"

Availability Evaluation of Multi-Tenant Service Function Chaining Infrastructures by Multidimensional Universal Generating Function

Abstract: The Network Function Virtualization (NFV) paradigm has been devised as an enabler of next generation network infrastructures by speeding up the provisioning and the composition of novel network services. The latter are implemented via a chain of virtualized network functions, a process known as Service Function Chaining. In this paper, we evaluate the availability of multi-tenant SFC infrastructures, where every network function is modeled as a multi-state system and is shared among different and independent tenants. To this aim, we propose a Universal Generating Function (UGF) approach, suitably extended to handle performance vectors, that we call Multidimensional UGF. This novel methodology is validated in a realistic multi-tenant telecommunication network scenario, where the service chain is composed by the network elements of an IP Multimedia Subsystem implemented via NFV. A steady-state availability evaluation of such an exemplary system is presented and a redundancy optimization problem is solved, so providing the SFC infrastructure which minimizes deployment cost while respecting a given availability requirement.

Comparative Performability Assessment of SFCs: The Case of Containerized IP Multimedia Subsystem

Abstract: The failure of a single network element composing a Service Function Chain (SFC) unavoidably leads to some degradation in terms of availability (ability of guaranteeing working conditions), and/or performance (ability of sustaining a certain workload) for the whole SFC. By considering both of these aspects, we propose, as a case study, a joint analysis of availability and performance (a.k.a. performability) of IP Multimedia Subsystem, an SFC infrastructure which plays a key role in the all-IP convergence of telecommunication services, especially as per prospects of $5{G}$ . We refer to an implementation of IMS based on container technology (containerized IMS, or cIMS) which allows to decouple the application layer from the underlying hardware infrastructure more efficiently than classic virtualization schemes. We model the probabilistic behavior of a cIMS by means of Stochastic Reward Networks (SRN) and Reliability Block Diagram (RBD) formalisms to take into account failure and repair events. Then, with the assistance of a designed-from-scratch algorithm (OptChains+), we carry on a performability analysis: i) to evaluate and compare series/parallel cIMS configurations (or settings), and ii) to find settings with minimum cost and maximum availability, given a performance level. The proposed assessment lends itself to a sensitivity analysis, here demonstrated by examples, useful for robustness evaluation.

Intrusion detection by machine learning for multimedia platform.

Abstract: The multimedia service company, Netflix, increased the number of new subscribers during the Coronavirus pandemic age. Intrusion detection systems for multimedia platforms can prevent the platform from network attacks. An intelligent intrusion detection system is proposed for the security IP Multimedia Subsystem (IMS) based on machine learning technology. For increasing the accuracy of the classifiers, it is vital to select the critical features to construct the intrusion detection system. Two-class classifiers, including the Decision Tree, Support Vector Machine, and Naive Bayesian, are selected to evaluate intrusion detection accuracy. According to the three classifiers' accuracy values, the most critical features are selected based on the features' ranking orders. Six critical features are selected:Service, dst_host_same_srv_rate, Flag, Protocol Type, Dst_host_rerror_rate, and Count. Numerical comparison with state_of_the_art shows that critical features improve intrusion detection accuracy, which can be better than the deep learning method.

An Approach Towards IoT-Based Healthcare Management System

Abstract: Internet of Things (IoT) can be employed in various applications like agriculture, disaster relief operations, smart and connected health care, this paper presents a healthcare system using IP Multimedia Subsystem (IMS) which can help doctors to monitor patient’s health from anywhere. IMS is the key idea of Next Generation Networks (NGNs) and integrated network of telecommunications that utilizes Internet Protocol (IP) for packet communications. Event-based Session Initiation Protocol (SIP) for Instant Messaging and Presence Leveraging Extensions (SIMPLE) architecture is the best solution for IMS-based systems. SIP protocol is used to communicate with IMS core and data is transmitted inside SIP messages. In this manner, there is no requirement for extra transport protocol. The proposed system can generate automatic alerts by sending calls and messages to various stakeholders like healthcare organization, family members, etc. in emergency situations. IMS client has been implemented using Nubomedia IMS connector which is customized to read and interpret data. The existing IMS clients like UCT and Boghe can’t read different files thereby prohibiting various forms of analysis and data manipulation. A rule-based interpretation of data is then done to trigger messages to the doctors if the values observed are above certain threshold. The developed system can be useful for monitoring patient’s health by collecting health data through smart watches, apps and sensors. The designed IMS platform can be extended to contribute in numerous fields like disaster management, healthcare system, emergency ambulance call setup by reading live data streams, monitoring and issuing notifications.

Performability of Network Service Chains: Stochastic Modeling and Assessment of Softwarized IP Multimedia Subsystem

Abstract: Service provisioning mechanisms implemented across 5G infrastructures take broadly into use the network service chain concept. Typically, it is coupled with Network Function Virtualization (NFV) paradigm, and consists in defining a pre-determined path traversed by a set of softwarized network nodes to provide specific services. A well known chain-like framework is the IP Multimedia Subsystem (IMS), a key infrastructure of 5G networks, that we characterize both by a performance and an availability perspective. Precisely, supported by a designed from scratch testbed realized through Clearwater platform, we perform a stochastic assessment of a softwarized IMS (softIMS) architecture where two main stages stand out: i) a performance analysis, where, exploiting the queueing network decomposition method, we formalize an optimization problem of resource allocation by modeling each softIMS node as an M/G/c system; ii) an availability assessment, where, adopting the Stochastic Reward Net methodology, we are able to characterize the behavior of softIMS in terms of failure/repair events, and to derive a set of optimal configurations satisfying a given availability requirement (e.g. five nines) while minimizing deployment costs. Two routines dubbed OptCNT and OptSearchChain have been devised to govern the performance and availability analyses, respectively.

HASFC: A MANO-Compliant Framework for Availability Management of Service Chains

Abstract: Most softwarized telco services are conveniently framed as service function chains (SFCs). Indeed, being structured as a combination of interconnected nodes, service chains may suffer from the single point of failure problem, meaning that an individual node malfunctioning could compromise the whole chain operation. To guarantee highly available (HA) levels, service providers are required to introduce redundancy strategies to achieve specific availability demands, where cost constraints have to be taken into account as well. Along these lines we propose HASFC, a framework designed to support, through a dedicated REST interface, the MANO infrastructure in deploying SFCs with an optimal availability/cost trade-off. Our framework is equipped with: an availability model builder aimed to construct probabilistic models of the SFC nodes in terms of failure/repair actions; and a chaining and selection module to compose the possible redundant SFCs, and extract the best candidates thereof. Beyond providing architectural details, we demonstrate the functionalities of HASFC through a use case that considers the IP Multimedia Subsystem, an SFC-like structure adopted to manage multimedia contents within 4G/5G networks.

Generic SDE and GA-based workload modeling for cloud systems

Abstract: Workload models are typically built based on user and application behavior in a system, limiting them to specific domains. Undoubtedly, such a practice creates a dilemma in a cloud computing (cloud) environment, where a wide range of heterogeneous applications are running and many users have access to these resources. The workload model in such an infrastructure must adapt to the evolution of the system configuration parameters, such as job load fluctuation. The aim of this work is to propose an approach that generates generic workload models (1) which are independent of user behavior and the applications running in the system, and can fit any workload domain and type, (2) model sharp workload variations that are most likely to appear in cloud environments, and (3) with high degree of fidelity with respect to observed data, within a short execution time. We propose two approaches for workload estimation, the first being a Hull-White and Genetic Algorithm (GA) combination, while the second is a Support Vector Regression (SVR) and Kalman-filter combination. Thorough experiments are conducted on real CPU and throughput datasets from virtualized IP Multimedia Subsystem (IMS), Web and cloud environments to study the efficiency of both propositions. The results show a higher accuracy for the Hull-White-GA approach with marginal overhead over the SVR-Kalman-Filter combination.

SFC Self-Modeling and Active Diagnosis

Abstract: The 5G system should be flexible to cope with diversity of functions and infrastructure, in an efficient way while supporting a wide range of services associated with a set of requirements through Service Function Chaining (SFC). Fault management plays a paramount role to fulfill the SFC requirements towards reliability of telecommunication networks. Model-based (MB) approaches are knowledge-based systems that reason about a system from an explicit representation of its structure and functional behavior through a dependency model. MB techniques solve novel diagnosis problems and provide explanations for their decisions. However, current MB methods suffer from some limitations due to network virtualization challenges: lack of network visibility and dynamic topologies. To tackle those limitations, we propose a self-modeling approach and an active diagnosis process for virtual networks that considers two types of knowledge to build the model: acquired knowledge and learned knowledge provided by fault injection to expand and validate the proposed model. The experimental results from their application to a real-world virtual IP Multimedia Subsystem (vIMS) use case show that the self-modeling and the active diagnosis procedures are effective in determining the root cause(s) of a failure and explaining fault propagation.

Network Slicing in LEO Satellite Network

Abstract: To solve the problems of LEO (Low Earth Orbit) satellite network, such as insufficient flexibility and low resource utilization, an architecture using network slicing technology is proposed. Then a prototype system based on the Docker platform and DTN (Delay Tolerant Network) is implemented, providing IMS (IP Multimedia Subsystem) network slice, Internet of Things network slice and web network slice. Tested by prototype system, the results show that each network slice can independently provide relevant service without affecting each other, and can be allocated network resources flexibly according to the performance requirements of the services. The architecture can effectively improve the flexibility of the core network of LEO satellite network.

Effective Performance Metrics for Multimedia Mission-critical Communication Systems

Abstract: Mission-critical Communication Systems that are adaptable for use with the latest generation of multimedia services are crucial for system users. To determine the set of requirements that need to be hardcoded into such systems, a clear distinction between mission-critical and non-mission-critical systems is required. Moreover, the users of services provided by such systems are very different to those of current mobile commercial communication systems. These differences give rise to a set of challenges that need addressing to facilitate migration from existing systems to those now being proposed. One such challenge relates to the performance of the IP Multimedia Subsystem (IMS) registration process. This is a crucial consideration for mission-critical systems, particularly in large-scale systems where thousands or even millions of users may seek to access the system in disaster scenarios. This paper presents an evaluation of IMS and Session Initiation Protocol (SIP) performance metrics and Key Performance Indicators (KPIs). Moreover, it articulates a proposed study that will seek to address some of the challenges identified.

The SYRROCA AI-empowered network automation platform

Abstract: This paper synthetically presents the SYRROCA (SYstem Radiography and ROot Cause Analysis) network automation framework at the state of the art, and details its experimental platform sufficiently enough to understand its technical demonstration. The framework aims to learn nominal operating conditions of a softwarized network service and characterize anomalies in real-time, while offering a compact system state representation called radiography. This representation can provide to operational teams with a real-time insight on anomalies at physical and virtualized layers. The related technical demonstration showcases how SYRROCA can detect real-time anomalies of different nature on a containerized vIMS (virtual IP Multimedia Subsystem) service managed by Kubernetes.

Mobile network operator (mno) and internet protocol (ip) multimedia subsystem session (ims) slicing

Abstract: Apparatuses and methods for Mobile Network Operator (MNO) and Internet Protocol (IP) Multimedia Subsystem (IMS) slicing. In one embodiment, a method for a Proxy-Call Session Control Function (P-CSCF node) includes sending a request message for requesting registration of the P-CSCF node in a network resource function (NRF) node, the request message including information indicating a MNO associated with the P-CSCF node. The information indicating the MNO includes at least one of: a MNO identifier; and at least one subscriber permanent identifier (SUPI) associated with the MNO. In another embodiment, a method for a Session Management Function (SMF) node includes discovering a profile of a P-CSCF node, the profile including information indicating a MNO associated with the P-CSCF node.

Apparatuses and methods for providing network indication of ip multimedia subsystem (ims) data service support to user equipment (ue)

Abstract: A method, executed by a User Equipment (UE) communicatively connected to a 3rd Generation Partnership Project (3GPP) network, is provided. The UE supports IP Multimedia Subsystem (IMS) data services. The method includes the following steps: receiving, by the UE, information concerning whether the 3GPP network supports the IMS data services from the 3GPP network; and determining, by the UE, whether to establish a Packet Data Network (PDN) connection or a Protocol Data Unit (PDU) session with the 3GPP network for the IMS data services according to the information concerning whether the 3GPP network supports the IMS data services.

Services-based architecture for ims

Abstract: In a system and a method for providing communication within IP Multimedia Subsystem (IMS) using a connectionless communication protocol, an IMS access layer, an IMS service layer, a common service utilities layer, a unified data repository layer, and an IMS network repository function (NRF) are provided. The IMS access layer terminates incoming communication that uses connection-oriented communication protocol. The IMS service layer is operatively connected to the IMS access layer and includes at least one micro-service implementing IMS service. The common service utilities layer is operatively connected to the IMS service layer and includes at least one utility accessible to the at least one micro-service. The unified data repository layer is operatively connected to, and accessible by, the common service utilities layer, the IMS service layer and the IMS access layer. The IMS NRF enables a network function (NF) or the micro-service to discover another NF or micro-service.

Network slicing management for the ip multimedia subsystem (ims) domain

Abstract: Systems, methods, and software for selecting among a plurality of IMS network slices. When an IP Multimedia Subsystem (IMS) network is partitioned into a plurality of IMS network slices, an IMS slice selection manager may be implemented at an edge of the IMS network slices. The IMS slice selection manager receives an IMS slice selection policy, and receives an IMS service request for an IMS service. The IMS slice selection manager selects an IMS network slice to provide the IMS service based on the IMS slice selection policy, and causes routing of the IMS service request to the selected IMS network slice.

Electronic device and operating method for registering ip multimedia subsystem

Abstract: An electronic device according to an embodiment may include a communication circuit, a processor, operatively connected to the communication circuit, and a memory operatively connected to the processor. The memory may store instructions to cause the processor to update an application including IP multimedia subsystem (IMS)-related data. Based on the update data received from a server through the communication circuit, obtain the updated IMS-related data through the application when the application is updated, and renew the IMS configuration information.

Method and apparatus for handover

Abstract: Embodiments of the present disclosure provide methods and apparatuses for handover. A method performed by a source NG-RAN, base station in a wireless communication network, for handling handover of a User Equipment, UE, the method comprises obtaining an indication information which indicates the IP Multimedia Subsystem, IMS, voice call initiation; and the method further comprises performing a handover policy to prioritize handover or redirection to an Evolved-Universal Terrestrial Radio Access Network, E-UTRAN, base station over handover to a target NG-RAN base station.

Ip multimedia subsystem information transmission method, terminal and network function

Abstract: Provided in the embodiments of the disclosure are an IMS information transmission method, a terminal and a network function. The method comprises: sending an NAS request, wherein the NAS request carries IMS information, and a first terminal was registered to an IMS before sending the NAS request.

Subscriber notification management system

Abstract: FIELD: telecommunications and communication.SUBSTANCE: invention relates to telecommunications and communication, specifically to management of notices of subscribers of cellular communication networks of any standards, incl. GSM, UMTS (IN Intelligent Network), LTE (IMS IP Multimedia Subsystem), on possibility of establishing a connection. Indicator of the operator's economic efficiency is increased due to taking into account the maximum possible number of network features of the calling and called subscribers when determining the direction of the ISA transfer. Control system is easily scaled to any number of subscriber network features and adapted to any ISA scenarios.EFFECT: determining the direction of transmitting a notification message to the calling or called subscriber about possible establishment of repeated call initiation based on analysis of network charging, geodata, other behavioural characteristics of the calling and called subscribers in the network, which leads to higher economic indices of the mobile network operator (NP network provider) by stimulating the performance of voice calls.3 cl, 2 dwg

Ims speech communication method, wireless communication apparatus, and communication system

Abstract: Disclosed are an IP multimedia subsystem (IMS) speech communication method, a wireless communication apparatus, and a communication system. The method comprises: receiving an evolved packet system (EPS) fallback indication message; switching from a first access network device supporting a fifth-generation mobile communication network to a second access network device supporting a fourth-generation mobile communication network, so as to perform IMS speech communication; and after the IMS speech communication is terminated, when a radio resource control connection release message is received, accessing the fifth-generation mobile communication network, wherein the radio resource control connection release message does not carry redirection carrier information. After receiving an EPS fallback indication message, a terminal falls back to a fourth-generation mobile communication network from a fifth-generation mobile communication network, then autonomously recognizes a scenario requiring an autonomous return, and autonomously returns to the fifth-generation mobile communication network in the scenario requiring the autonomous return.

Practice emergency call system

Abstract: An emergency call practice application can execute on user equipment (UE) to allow users to practice dialing 9-1-1 or other emergency numbers. In a network practice mode, the emergency call practice application can initiate a practice emergency call by sending a call setup message to an IP Multimedia Subsystem (IMS). The IMS can route the call setup message to a Public Safety Answering Point (PSAP) routing server, which can recognize a destination identifier in the call setup message as being associated with a test server instead of a PSAP. The PSAP routing server can forward the call setup message to the test server to connect the practice emergency call.

Network nodes and methods performed therein for handling discovery of entrance points to an ip multimedia subsystem

Abstract: Embodiments herein relate to a method performed by a first network node (110) in a communications network, for handling of discovery of entrance points of a User Equipment, UE, (120) to an IP Multimedia Subsystem, IMS, network, during an IMS Protocol Data Unit, PDU, session setup. The first network node (110) obtains a list of IMS entrance point instances, wherein the list of IMS entrance point instances comprises an address of each IMS entrance point instance and one or more transport protocols supported by each IMS entrance point instance. The first network node (110) generates, based on the obtained list of IMS entrance point instances, a configuration message for IMS entrance point discovery, comprising the address of the IMS entrance point instance and the one or more transport protocols supported by each IMS entrance point instance. The first network node (110) further provides, to the UE (120), the generated configuration message. The embodiments herein further relate to methods performed by a second network node (111) and bythe UE (120).

Methods and Apparatuses for Enhancement to IP Multimedia Subsystem

Abstract: Methods and apparatuses are disclosed for enhancement to an internet protocol (IP) multimedia subsystem (IMS). According to an embodiment, an application server (AS) of the IMS receives from a terminal device a first request for initiating a call service and an internet service which are to be integrated with each other. The AS of the IMS sends a second request for initiating the internet service to a gateway server that acts as a gateway to an internet AS capable of providing the internet service. In response to a reply from the gateway server, the AS of the IMS handles the first request based on the reply.

Method for improved handling of ip multimedia subsystem calls in a home mobile communication network and a visited mobile communication network

Abstract: The invention relates to a method for improved handling of IP multimedia subsystem calls and configuration of a user equipment using a home mobile communication network in the situation that either - the user equipment attempts or is able to attempt an IP multimedia subsystem emergency call or a IP multimedia subsystem call, and the user equipment being connected to a visited mobile communication network via a radio access network of or associated with the visited mobile communication network, or - the user equipment attempts or is able to attempt an IP multimedia subsystem emergency call, the user equipment being connected to the home mobile communication network via a radio access network of or associated with the home mobile communication network, wherein the method comprises the following steps: - in a first step, an IP multimedia subsystem call parameter information or an IP multimedia subsystem emergency call parameter information is transmitted by the visited mobile communication network to the user equipment in case that the user equipment is connected to the visited mobile communication network, or an IP multimedia subsystem emergency call parameter information is transmitted by the home mobile communication network to the user equipment in case that the user equipment is connected to the home mobile communication network, - in a second step, during or subsequent to the first step, the user equipment –upon attempting an IP multimedia subsystem emergency call and/or an IP multimedia subsystem call –applies or acts according to the content of the IP multimedia subsystem call parameter information and/or of the IP multimedia subsystem emergency call parameter information.