Glossary Library


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VoLTE = Voice over Long-Term Evolution

VoLTE (Voice over Long-Term Evolution) is based on the IMS network. The control layer and media layer of voice services are transmitted as data streams in the LTE data transport network, without the need to maintain or rely on the traditional CS voice network. Compared with the 2G/3G network, the voice call connection time of the VoLTE network can be shortened to 1/10, the voice quality can be improved by 2 times, and the video quality can be improved by 10 times. The voice and data capacity of the VoLTE network exceeds three times over 3G UMTS, and six times or more over 2G GSM.
ZTE VoLTE solution is an end-to-end overall solution, including components such as IMS, EPC, CS, RAN and signaling network. It provides new services such as HD voice, HD video and RCS. It can effectively improve customers’ market competitiveness in the voice service field and enhance user loyalty. ZTE VoLTE solution is a full set of core network cloudification solutions. It has a leading cloudified architecture and can realize low-cost innovation through componentization and micro-services. In addition, it can implement virtualization on both the control plane and the media plane, and supports the Multi-tenancy deployment mode. In addition, through efficient intelligent O&M tools, it shortens the new service deployment period from months to days, and launches new services rapidly as needed.

VoNR (Voice Over New Radio) is the voice target solution of the 5G network. The deployment of the 5G network has multiple options. Therefore, in addition to the VoNR target solution, the 5G voice solution also has such supplementary solutions as EPS Fallback, RAT Fallback and 5G SRVCC to meet the requirements of different network deployment modes and different network development phases. The 3GPP R15 standard has confirmed that the 4G VoLTE voice architecture is still used for 5G voice to provide voice services based on the IMS. The specific voice solution adopted by the operator depends on the actual 5G deployment mode and wireless deployment progress.
ZTE 5G voice solution provides unified access for 2G, 3G, 4G, 5G, WiFi and fixed network users. It supports the convergence of VoNR, VoLTE, VoWiFi, RCS, and FMC, and provides various multimedia service experience such as HD voice, HD video, multi-stream video and eSIM card, thus enhancing the operator's competitiveness in the competition with OTT. At the same time, through the standard API, network capabilities are open to third-party individuals, enterprises, and partners to quickly introduce various Internet applications.

RCS is a series of GSMA standards defined rich communication services for IMS network, including instant message, voice calling and presence based on user MSISDN. As a principal member of GSMA, ZTE takes an active participation in RCS technical specifications. ZTE offers an end-to-end RCS solution based on specification including IMS, RCS AS, MaaP, RCS HUB, and SDK. RCS upgrades the traditional message service and provides rich communication service and new entrance of business messaging service. Meanwhile, RCS is a mandatory servie embedded in 5G terminals as defined in GSMA NG.114 and RCS will be the core of 5G messaging service.

NFVI (NFV Infrastructure) is the foundation for hosting VNF (Virtualized Network Function), which uses standardized virtualization technology to build a unified and shared resource pool to support multiple -tenants based on generic generic hardware, thus to provide resource for different types of VNF on demand.
NFVI includes the virtualization layers (hypervisor or container management systems such as Docker) and physical resources (e.g. COTS servers, switches, storage devices, etc.). NFVI can be deployed across different geographical locations, at which point a network that provides data connections to these sites is also known as part of NFVI.

Network automation refers to adopting automatic operation flows, a series of automatic tools, big data and AI to implement end-to-end automation of network services and management, including network planning, construction, maintenance, optimization, and operation.

With the deployment of 5G networks, network O&M faces huge challenges, so it is a must to achieve automatic and intelligent transformation of O&M. However, such transformation is a process of long-term evolution. It needs to be promoted step by step according to the legacy network situation, cloud transformation progress, maturity of 5G and IoT technologies and operators’ network evolution strategy. The industry usually divides the network intelligence process into five stages: L1 computer-assisted operation, L2 preliminary intelligent, L3 intermediate intelligent, L4 advanced intelligent and L5 fully intelligent.

The trend of telecom network architecture is towards separation with the higher requirements on bandwidth and time latency by 5G: The cControl plane functions are centralized deployed on the core cloud to improve the management efficiency; the user plane functions are deployed on the edge cloud close to the users to improve the performance of data processing and data forwarding, so as to ensure the user experiences. In order to cope with this trend, the deployment of Telecom cloud infrastructure presentsuses the distributed cloud mode of "core cloud + edge cloud". The edge cloud has the characteristics of lightweight, high performance and easy deployment, while the central core cloud has the ability of is capable of large-scale deployment and efficient O&M.

Network slicing is an on-demand networking mode. In brief, a physical network is divided into multiple virtual end-to-end networks, and each virtual network, including device, access, transmission, and core network, is logically independent. If any virtual network fails, other virtual networks are not affected. Each virtual network is similar to the plier and saw on the Swiss Army knife, as it has different functions and features and is oriented to different requirements and services.

Network Function Virtualization (NFV) is the core of network slicing technology. It separates hardware and software from the traditional network. Hardware is deployed by a common server, and software is carried by different Network Functions (NFs), thus flexibly assembling services.

Orchestration, first appeared in the art field, means to arrange various music and dance elements according to a certain purpose, in order to achieve the best effect.

NFV Orchestrator (NFVO) is a functional entity of the NFV network management MANO (Management and Orchestration). The MANO consists of NFVO (NFV Orchestrator), VNFM (VNF Manager) and VIM (Virtualised infrastructure manager).

The NFVO manages the lifecycle of Network Service (NS), and coordinates the NS lifecycle management, coordinates the VNF lifecycle management (with the support of VNFM), and coordinates the management of various NFVI resources (with the support of VIM) to ensure the optimized configuration of various required resources and connections.

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