Ims Business In Its User Experience-ims, Ngn, Sip-communications Industry

In discussing the requirements of the NGN, based on a brief description of the IMS

(IPMultimediaSubsystem, IP Multimedia Subsystem) system and theory, focuses on the IMS can provide the business and user experience after using these operations.

I. Introduction On the next generation network (NGN), now has been discussed a lot. After nearly a decade of heated debate on the use of IP-technology-based next-generation networks have been no controversy, but on how to implement NGN, NGN is the first of what is required, is still under discussion, there is also mention some of my view.

The vast number of users, I hope NGN can provide wide range of communication services, including traditional telephony, there are a large number of multimedia communication services with each passing day, want to provide excellent quality, easy to use, cheap business, want to provide to meet the individual needs of the individual business (in the individual needs of the time, place, providing the desired information), also hopes to provide new services quickly.

For telecom operators, NGN whom want to increase revenue, reduce investment, protect existing investments, such as to establish a unified multi-service network, which is no longer present such a multi-service multi-network (multi-network co-exist) The situation is obviously very favorable. Because it can increase the number of value-added services users need to meet the needs of users, revenues will increase significantly; As a result of a unified network, using a unified mechanism for operation and maintenance, will reduce the number of operation and maintenance costs of inputs, greatly reduce the cost of building the network input; if full use of the existing network, mainly in the form of software upgrades build this unified network, you can save a lot of network infrastructure costs, protect the large number of existing network investment funds.

Visible, whether the user or the telecommunications operators, are very eager to develop and establish a unified multi-service network, allowing users to enjoy high-quality affordable multi-service and personalized services, enabling operators to increase revenue and reduce investment. These are also the requirements of the NGN.

Requirements of NGN in the clear on the basis of the last few years, 3GPP and 3GPP2 IMS proposed SIP-based discussion by the global communications industry attention. Some experts believe that "IMS will probably eventually replace the soft switching, as a unified business platform." View, this evaluation is not over, because the concrete realization of NGN it a good foundation.

Currently, IMS is mainly used in mobile networks, which use a unified SIP, open interfaces, layered, distributed structure for providing multimedia services independent of access methods is to wired and wireless networks fusion direction.

2, IMS System Introduction IMS using SIP, to provide multimedia services to business system, which by the application layer, call control layer and the transmission, access layer. The composition of the system shown in Figure 1.

SIP IP network is used to establish, modify and terminate multimedia sessions. SIP is an application layer protocol used on a variety of transmission protocols, the generation and management of IP terminal (user agent) between sessions. Between user agents using Session Description Protocol (SDP) media type used in negotiation (such as voice, video, etc.), the codec type (such as G.711, H.26x, etc.), real-time transport protocol (RTP) carries IP and UDP packet streams. SIP session management using the more complex to generate transfer, forwarding, conferencing services, while SIP does not provide any business, but it is the interaction with the application server, providing a large variety of services to promote the rapid production of basic functions.

SIP resources into a unified symbol, called SIPURI, it is the basis for routing SIP messages, like e-mail addresses, telephone numbers.

In Figure 1 the implementation of SIP Session Controller registration, application service control (interaction with the application server), routing, AAA (authentication, authorization, payment), session control (session establishment, modification, use of resources to terminate the session) media resources, access and security features.

Can be seen from Figure 1, IMS call session control, telephony applications server and media resource controller are software modules, they can be in soft-switch platform to achieve, only a variety of application servers and media resources are independent entity. Therefore, IMS system can basically be used to upgrade existing networks and software to be realized, it will be the protection of existing investment, saving the operator's input.

3, IMS business end-user experience Large number of facts show that the business is not a technical decision, but the technology business decisions. ISDN, ATM technology, one after another out of business, IP technology and Internet business development than people expected, can be seen: whether the development of communication services, not the technical complexity of the final analysis, the user can accept the business user has personal experience. If you use some kind of business users a convenient, intuitive, easy to use, seamless, transparent, and that users have a good business experience, then the user is willing to use it, and pay for it. Internet web browsing, downloading files, etc. The reason why web services are widely welcomed because the user through use, good business experience with these. This is a successful example.

1. Dynamic multimedia session control Current circuit switched (CS) domain and Packet Switched (PS) domain service can not be fully realized Web-like user experience, IMS is a telecommunications operator to provide similar Web services capabilities. CS domain only allows users in each session to use only one type of business, such as a voice call end-user is the same time, wish to send instant messages to each other, he must end or suspend the voice call to a mobile from the same Terminal send instant messages. If the PS domain with GPRS, parallel sending IP session is technically possible, but by the bandwidth, QoS, and pay such restrictions.

IMS is different, it can be used much more flexible and easy to use session mode, using IMS service system, end users can start: a conversation in a variety of business operations simultaneously in multiple sessions, multiple sessions must be multiple non-related business, in short, the conversation can be dynamically controlled.

(1) multi-service? Single session

Example: A calls for a voice / video call to his friend B, but B was only accepts the voice call; then B decides to add video call session, so the video component was added to the existing

by: gaga

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