外文翻譯--基于應(yīng)用的gsm短消息業(yè)務(wù)（英文）

1、Distributed Architecture for Applications based on the GSM Short Message Service Giovanni Martini, Giorgio Rosenga CSELT Via G. Reiss Romoli 274 - 10148 Torino (Italy) e-mail: (martini,rosenga} @cselt.stet.it Abstr

2、act This paper presents a distributed architecture for the definition and the deployment of applications based on the Short Message Service of the GSM network, and illustrates a first prototype realization using the

3、OSF/DCE. 1. Introduction Mobile communications are quickly changing the way people work and communicate. Increased is the need for new, personal and ubiquitous services. The pan european standard for mobile communicati

4、on, GSM [l], is expected to play a major role in the scene of personal communication systems. While the high expectations of the final users on mobile communications ask for new services, the urge for new infrastruc

5、ture architectures is increasing in a parallel way. These new approaches come in help to network operators and to service providers in order to ease their task of definition, deployment and management of new services

6、. Bearing in mind this facts as the reference scene, and focusing on the GSM network in particular, we devised a distributed approach for a particular class of services, based on the GSM Short Message Service, or SMS

7、, which is on the way of hlfilling the previous requirements. This paper illustrates the usage of OSF/DCE [3,4] as the communication framework of a distributed architecture for the definition and the implementation of

8、 applications based on the GSM Short Message Service. The paper is organized in the following way: after a brief overview of the GSM network and of the services it can support, we focus on the characteristics of the S

9、MS, and on the possible set of applications whch are based on. Furthermore, we compare the traditional approach in the definition and realization of applications with the distributed solution. A more detailed descrip

10、tion of the solution with the DCE, is then illustrated. 140 2. GSM: the network and the services The GSM network is t h epan european standard for the mobile communications. In the next sections its main characteristi

11、cs are illustrated. 2.1 The GSM network The GSM system has been the first standardized system that uses digital transmission for the radio channel. This makes it compatible with the digital evolution of the fixed netw

12、orks. Without deepening too much into details, the main elements of a GSM network are illustrated in Fig. 1. They are: the mobile station (MS): it is the mobile terminal used by the final user to access the GSM netwo

13、rk and to make use of its services; the base station system (BSS): it is the network element which converts the radio signals from the mobile terminals into signals for the fixed network; it provides for the manageme

14、nt of the radio resources over a single cell, and for the switching between the radio channels and the connections with the mobile switching centers; the mobile switching center (MSC): it is the element which routes a

15、nd retransmits the data all through the network; it is connected to the local public switched telephony network (PSTN) to provide the connectivity between the mobile and the fixed telephony users. m . PSTN Fig. 1 :

16、GSM cellular infrastructure 0-8186-7092-4/95 $04.00 0 1995 IEEE One of the applications we have focused on in our prototyping, is the electronic mail, one of the most common service available on the fixed network. Th

17、e GSM is emerging as the global network interconnecting the users of the fixed and of the mobile networks. It is natural to envisage the electronic mail as one of the first applications which is going to extend the

18、services based on the short message. 3. Software architecture of the Service Center In the next paragraphs two different application architectures will be compared. The traditional one, which derives in a natural w

19、ay from the more general view of the GSM framework, and one more innovative, which distributes and widens the range of the applications of the SMS-C. Following the comparison of the two approach, a more detailed desc

20、ription of the distributed one is illustrated. 3.1 The traditional architecture The traditional architecture of a SMS-C , with some application installed in it, is depicted in the Fig. 2. For the sake of simplicity, i

21、t is supposed that the user nodes and the Service Center are connected only by the TCP/IP protocol, while the SS7 protocol is used to communicate between the Service Center and the mobile switching center (of course

22、other communication protocols may be used to connect the Service Center with the fixed network). v Service Center Management ~ p p i . APP~. Accounting 1 ... Message Kernel User . ss7 I TCP I / Mobile 1 User

23、I Fig. 2: monolithic architecture of the Service Center The traditional application architecture here illustrated, strongly monolithic, is composed of the following main modules: message kernel: it is the core of the S

24、MS-C and implements the store and forward functionalities; management: the management functionalities for the control of the SMS-C itself and of the installed applications (e.g. deploying a new version for a given ap

25、plication, or changing some runtime parameters of the message kernel); application: it is the set of the applications, each one identified by its own protocol identifier; user: it is the front-end program that interac

26、ts with the final user and the application on the SMS-C. This solution requires that all the applications are installed in the same node of the SMS-C. This fact imposes some constraints on the global application arch

27、itecture, which may be summarized in the following points: limit on the usage and availability of the resources in the SMS-C node for each installed application, which may lead eventually to some constraints on the ov

28、erall performance; lack of openness of the configuration: in this way the applications are strongly integrated with the SMS-C and with the interface of the message kernel made available by its manufacturer. This fact

29、 makes really hard trying to integrate applications available by third party software providers. This point represents a significant issue for the network operators that do not want to be tied to a single manufacture

30、r. 3.2 The distributed architecture The proposed distributed architecture is intended to give a solution to the inconvenients of the traditional one. In Fig. 3 a schema of the distributed solution is depicted. The main

31、 idea is to decouple the principal components of the SMS-C and to remote them on different hosts, maintaining at the same time the possibility for some application to be directly installed on the SMS-C itself. The ma

32、in advantages of such a solution are: openness of the SMS-C: having made public the interface of the message kernel (not only from a specification point of view but also from the interoperability one), it is now possi

33、ble a greater flexibility in the introduction and in the development of new applications, not being anymore constrained only to the ones supplied by the SMS-C manufacturer; increased fault tolerance: it is possible to