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蜂窝移动通信发展的总趋势是系统容量越来越大,技术越来越先进,组网方式、入网方式及业务的提供越来越灵活。CDMA是近年来用于数字蜂窝移动通信的一种先进的无线扩频通信技术。从业务角度来看,CDMA系统从服务的角度出发,为用户提供了更加丰富、多样且应用灵活方便的业务。本文将对这些业务作一介绍。按照CDMA的规范,交换子系统应能向用户提供用户终端业务、承载业务、补充业务三类业务。用户终端业务用户终端业务是在用户终端协议互通基础上提供终端间信息传递能力的业务,该类业务包括电话业务、紧急呼叫业务、短消息业务和语音… 相似文献
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国内最大的固定电话业务运营商中国电信近日委托其上海研发中心,对步步高、汉王科技、侨兴、深圳泰丰等20家电话终端合作伙伴的27款信息电话终端,按照技术测试方案进行了产品技术初测、产品开发辅导、产品改进和产品技术的复测工作。据了解,这次检测的目的是为即将启动的省市公司采购提供参考意见。中国电信此举并非空穴来风。按照有关规定,今年3月底,固定电话和手机要实现短信息的互通,而两大不同网络短信息的互通,除了要制定相关互联互通的标准之外,有一个非常现实的问题不容忽视,那就是终端问题。中国电信对与其有合作关系的20家固定电话生产厂家的智能电话机进行技术测试,看得出这个中国最大的固网运营商对手机和固定电话短消息互通非常重视。测试毕竟只是测试,厂商们真正关心的是测试以后能否从运营商手中拿到单子,而随后将到的就应该是智能电话终端市场的争夺了。 相似文献
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本提出了现有GSM平台上进行VoIP等增值业务的iGSM技术,能使用户通过手机或H.323终端(IP电话机或PC)获得VoIP服务,讨论了在不改变现有的GSM网络的前提下,iGSM的结构及自动漫游信令过程。 相似文献
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国内最大的固定电话业务运营商中国电信近日委托其上海研发中心,对步步高.汉王科技、侨兴.深圳泰丰等20家电话终端合作伙伴的27款信息电话终端,按照技术测试方案进行了产品技术初测、产品开发辅导.产品改进和产品技术的复测工作。据了解,这次检测的目的是为即将启动的省市公司采购提供参考意见。中国电信此举并非空穴来风。按照有关规定.今年3月底.固定电话和手机要实现短信息的互通.而两大不同网络短信息的互通.除了要制定相关互联互通的标准之外,有一个非常现实的问题不容忽视.那就是终端问题。中国电信对与其有合作关系的20家固定电话生产厂家的智能电话机进行技术测试,看得出这个中国最大的固网运营商对手机和固定电话短消息互通非常重视。测试毕竟只是测试。厂商们真正关心的是测试以后能否从运营商手中拿到单子,而随后将到的就应该是智能电话终端市场的争夺了。 相似文献
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本文提出了在现有GSM平台上进行VoIP等增值业务的iGSM技术,能使用户通过手机或H.323终端(IP电话机或PC)获得VoIP服务,讨论了在不改变现有的GSM网络的前提下,iGSM的结构及自动漫游信令过程。 相似文献
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Sykas E.D. Theologou M.E. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1991,79(2):230-241
Numbering and addressing issues arising in the integrated broadband communication network (IBCN) for the support of the Universal Mobile Telecommunication System (UMTS) and Personal Telecommunication Service (PTS) are discussed. Mobile communications services will allow a user to roam within a network. Thus, there will be a need to identify several types of objects (terminals, network points of attachment, users, customers premises networks or CPN, etc.). The mobility properties of these objects will necessitate dynamic bindings between their addresses and names. The situation is further complicated because the mobility may be embedded. A mobile user may employ a mobile terminal in a mobile CPN. Therefore, in UMTS and PTS there is a need for dynamic binding of various identifiers with location information data. The exclusive use of personal telecommunication numbers (PTNs) as dialing numbers (DNs) is proposed in IBCN for UMTS and PTS. That is, PTNs will be used (during dialing) for making calls to mobile terminals, mobile users, and fixed subscribers. When the personal communication service is not provided, the DN corresponds to the terminal number of the equipment (fixed or mobile) of the called subscriber 相似文献
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With enormous growth of the number of Internet users and appearance of new applications, characterization of Internet traffic has attracted more and more attention and has become one of the major challenging issues in telecommunication network over the past few years. In this paper, we study the network traffic pattern of the aggregate traffic and of specific application traffic, especially the popular applications such as P2P, VoIP that contribute most network traffic. Our study verified that majority Internet backbone traffic is contributed by a small portion of users and a power function can be used to approximate the contribution of each user to the overall traffic. We show that P2P applications are the dominant traffic contributor in current Internet Backbone of China. In addition, we selectively present the traffic pattern of different applications in detail. 相似文献
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本文提出了基于口可堆叠式的VoIP通信应用系统的系统架构,重点介绍了面向IP可堆叠式的VoIP语音板卡的固件程序设计.每块VoIP语音板卡支持8路语音,通过自定义的通信协议可使不同的VoIP语音板卡独立地通过IP互联,实现基于IP可堆叠.自定义通信协议实现了VoIP语音板卡中芯片内部通道之间、VoIP语音板卡上芯片之间、不同VoIP语音板卡之间,以及VoIP语音板卡与管理PC间的通信.VoIP语音板卡控制软件以内核模块方式运行,并在内核模块方式下由VINETIC-2CPE语音芯片中断服务程序激活回调函数,提高了实时性. 相似文献
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Eckardt T.O. Magedanz T. Popescu-Zeletin R. 《Selected Areas in Communications, IEEE Journal on》1997,15(7):1308-1314
The vision for future telecommunications is often described by the slogan “information at any time, at any place, in any form”, driven by both society's increasing demand for “universal connectivity” and the technological progress in the area of mobile computing and personal communications. In order to realize this vision, the emerging concept of personal communications support (PCS), which includes support for personal mobility, service personalization, and advanced service interoperability, is becoming increasingly important since it allows users to configure their communications environment in accordance with their individual needs, thereby providing them with controlled access to telecommunication services, regardless of their current location, terminal and network capabilities. This paper provides an overview of a personal communications support system (PCSS). The PCSS represents a platform providing advanced PCS capabilities in a uniform way to numerous communication applications in distributed multimedia environments. From a functional perspective, the PCSS provides enhanced intelligent network (IN) and universal personal telecommunication (UPT) capabilities with respect to user addressing (based on logical names instead of numbers) and advanced user control capabilities. From a design perspective, the centralistic IN/UPT approach to the realization of service logic has been replaced by a highly distributable, object-oriented approach based on X.500/X.700/telecommunications management network (TMN) concepts. This paper addresses the basic aspects of the PCSS, including design criteria, system architecture, supported applications, and evolution issues 相似文献
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从普遍服务、互联互通、用户名/编号、执法监听、紧急呼叫与基于位置的监管等六方面介绍了政府管制的内容,并分析了其对VoIP运营环境的影响.阐明了VoIP运营环境中可能的资费组成具有的特征:VoIP业务使用与承载网络资源使用分别计费;同一运营商内部实行低廉的VoIP基础资费;不同运营商之间的业务互通支付单独费用;服务质量和安全保障将成为附加的VoIP服务. 相似文献