未来移动通信中的DECT通信技术

介绍了DECT的发展历程，讨论了DECT为了前向兼容所采取的技术和措施，研究了DECT的技术特点和应用领域，展示DECT独特的特点和应用前景。     

泛欧数字无绳电话(DECT)系统综述

泛欧数字无绳电话(DECT)标准的制定始于1985年,并准备作为唯一的正式泛欧数字无绳电话标准。欧共体决定所有成员国都应将1880～1900MHz的频段分配给DECT,同时,欧洲其它一些非欧共体成员国(如东欧的一些国家)也将这一频段分配给了DECT,这为DECT成为一个真正的欧洲标准铺平了道路。同时也有助于欧洲电信市场的统一。 为了进一步向PCN(个人通信网)方向发展,在DECT标准的制定过程中。不仅使其可以提供家用无绳电话功能、电信点功能,而且还可以用作无绳用户交换机(无绳PBX)、无     

DECT/GSM双模式终端——移动通信的又一种选择

近几年来,随着蜂窝电话和家庭无绳电话的兴起,移动无线通信的目标已变为现实。 DECT/GSM双模式终端把两种领先的无线通信技术结合在一起形成一个最终用户终端设备。这种结合使通信更简单、有效,因而,对最终用户更有意义和价值。移动通信和有线通信的运营者也可从DECT/GSM双模式终端中受益。 DECT/GSM均由ETSI标准化并且是公开的文件化的标准,DECT标准与GSM标准可互用,因而DECT容易接到     

DECT和CTM

DECT技术刚开始是在专网环境中找到它的位置的,因为DECT首先是为专网而构思的,然而不久,大家就确信DECT不仅仅适用于家庭和办公室环境。事实上,DECT已经显示出它是一种能改变公共电信网的新兴技术。DECT技术已在以下几个方面开始使用:     

将DECT连到GSM网络上

DECT无线技术怎样接入GSM网络上,将DECT连到GSM上在欧洲ETSI委员会中已列为一个标准化课题,因而可以一种通用的方式实施。 DECT标准 DECT是一种数字无绳技术,它通过一定的接口能够连到一定的电信网络上。DECT的基本标准(ETS300 175系列)定义了一个灵活的无线接入技术,它可以用在不同的环境中,如住宅无绳电话,无线PBX,无绳电话以及连到象ISDN     

博通：Wi-Fi将连接一切3C应用

日前,博通推出业界首款单芯片宽带集成接入器件（IAD）BCM6362,它集成了高性能ADSL2＋和801．11n无线局域网（WLAN）以及以太网交换、数字增强无线通信（DECT）和IP话音（VoIP）技术。这个整合了DSL＋WLAN的解决方案使消费者不再需要购买单独的DSL凋制解调器、无线路由器和DECT无线基站,从而极大地降低了家庭连网的成本。而服务提供商也能够通过单个设备提供快速互联网连接以及可靠的DECT／DECT6．0／CAT-iq和Wi-Fi连接,以支持三网合一（话音、视频和数据）业务。     

无线市话的发展与前景

介绍了无线市话的概念、发展历史和最新发展的微蜂窝DECT技术,以及采用微蜂窝DECT技术的EST1900和PASTM系统的性能、特点等,讨论了无线市话业务的前景。     

DECT全欧数字无绳电话

文章简要介绍DECT数字无绳电话的一些发展情况。DECT是新一代的数字无绳电话,较以前的CT—2有不少改进。DECT是根据欧洲电信标准协会(EISI)的标准制定的,在现有通信网中使用时,有很大的通用性。     

通信

Broadcom集成ADSL2＋、802．11n和DECT的单芯片IAD Broadcom推出业界首款单芯片宽带综合接入设备（IAD），为实现IAD和高端住宅网关而集成了高性能ADSL2＋和801．11n以及以太网交换、数字增强无绳通信（DECT）和IP话音（VoIP）技术。该方案使制造商能够以最少数量的元器件、最小的尺寸、最低的功率和成本设计和开发产品，使服务提供商能够通过单个设备提供快速互联网连接以及可靠的DECT／DECT6．0／CAT-iq和Wi-Fi连接，     

从欧洲向亚洲推广的DECT与Alcatel公司接入系统部商务经理JavierToribio先生一夕谈

起源于欧洲，DECT（“数字增强型无绳电话”的缩称）在这个大陆上运行已有3个年头，日臻成熟。据《亚洲DECT新闻》第1期报导，当前世界上已有27个国家采用了DECT标准，许多其他的国家和地区，亦正处于安排频率过程之中。     

Mobile IP-DECT internetworking architecture supporting IMT-2000applications

Realistic realization and mass acceptance of mobile data services require networking architectures offering acceptable quality of service and attractive tariffs. A novel strategy for this goal is maximum integration of popular data networking standards and their infrastructure into wireless networks. This article discusses a Mobile IP-based network architecture to provide IP services in DECT to support IMT-2000 applications. DECT offers micromobility within multicell subnets, while Mobile IP supports macromobility between multicell subnets. Incorporating Mobile IP into the DECT handoff mechanism in this way extends DECT micromobility with IP macromobility. Also, utilizing fast, seamless DECT handoff management reduces Mobile IP handoff delay to circumvent TCP throughput degradation during handoff and reduce frequency of Mobile IP signaling over the ether to conserve spectral efficiency. This feature seamlessly unifies DECT with the global Internet. Seamless integration of DECT with the Internet is crucial due to the continuing phenomenal popularity of the Internet and wireless communications, and ubiquity of DECT systems. To achieve the above DECT/IP interworking efficiently, the architecture introduces a network entity called a DECT service switching point, which is an extended DECT central control fixed part. DECT network-level services are mapped onto those of the IETF integrated services architecture to maintain QoS provided by DECT in the backbone Internet. Mobile Resource Reservation Protocol, an extended RSVP tailored to mobile networking, is adopted to provide the needed signaling in IntServ. The proposed architecture preserves traditional non-IP based services such as PSTN voice     

A wideband two-layer radio access network using DECT technology inthe uplink

This article describes a novel architecture of a broadband radio access network using the two-layer network solution. The proposed downlink is compliant with the DVB-S standards, and a DECT custom solution is used in the return channel. The idea we present is based on the use of a “single carrier with equalization” system in order to directly link the end-user terminal, avoiding the most expensive part of the cabling network: the last mile. The article reports, some considerations concerning the advantages and disadvantages of the novel architecture. Successively, aspects such as frequency plan, architecture of the base station, local repeater, and user terminal, in combination with some practical studies, are discussed     

DECT coverage of indoor-outdoor environments

A joint street microcell/office picocell model is used to evaluate a digitally enhanced cordless telecommunications (DECT) system providing outdoor as well as indoor radio coverage from indoor radio ports. The indoor DECT network is able to provide seamless communication within the city area with no capacity loss, provided that the majority of calls are originated from indoors     

Low-tier wireless local loop radio systems. I. Introduction

The article provides the results of a set of analyses conducted to compare two major radio technologies, DECT/PWT-E and PACS, for their suitability in the local loop in the United States to provide voice and data services. DECT, digital enhanced cordless telecommunications, is a radio interface standard developed in Europe mainly for indoor wireless applications and being promoted lately for wireless local loop applications as well. PWT, personal wireless telecommunications, is a DECT-based standard developed by the TIA in the United States for the unlicensed PCS applications. PWT-E, enhanced, is the version that is suitable for the licensed PCS applications. PACS, personal access communications systems, is a total system standard (i.e. radio interface and associated network infrastructures) developed in the United States for licensed PCS applications. (PACS-UA and PACS-UB are the standards for the unlicensed PCS applications.) For the wireless local loop (WLL), we make an assumption that the radio technologies operating in the licensed PCS spectrum are more suitable to provide a quality of service that is expected traditionally from a local exchange company (LEC). Therefore, this article focuses on the PACS and PWT-E, rather than PACS-UB and PWT. Also note that the article focuses on the North American version, PWT-E, rather than the European version, DECT. It provides an introduction to the PACS and PWT technologies     

Interworking between Digital European Cordless Telecommunications and a distributed packet switch

The Digital European Cordless Telecommunications (DECT) standard specifies an air interface. DECT requires an external infrastructure to transfer information between wireless terminals, and to transfer information between a wireless terminal and a fixed network. The Public Switched Telephone Network, the GSM Cellular Network, Private Branch Exchanges and mobile data networks are all under investigation as DECT backbone networks.In this paper we look to the future and describe interworking between the DECT air interface and a wireless network infrastructure referred to as a Cellular Packet Switch. To achieve distributed network control, the Cellular Packet Switch uses an IEEE 802.6 Metropolitan Area Network to link base stations, databases and fixed networks. In this paper we specify details of DECT information transport on the Metropolitan Area Network. We also give examples of Network Layer message flows for location updating and handover. The messages for other key procedures including call origination and release appear in a more detailed technical report.This work was completed while the author was a visiting scholar from AT&T Bell Laboratories.     

DECT-beyond CT2

Within Europe there are two standards for digital cordless telephony: CT2 and DECT (Digital European Cordless Telephony). The author traces the origins of both standards and compares their features, services and facilities. The author then looks at DECT in more detail discussing the service principles, network access and protocol architecture. The author then discusses the complementary roles of CT2 and DECT     

Evolutionary mobility and service support in DECT access networks

This paper presents an access-independent network architecture for supporting UMTS service capabilities. The approach is based on an enhanced B-ISDN core network with personal and terminal mobility provided by intelligent network techniques. A physical realization is presented, and the protocols corresponding to the physical interfaces are identified. Protocols are proposed for UMTS mobility and service support, and the impact on the B-UNI and IN interfaces is considered. Reflecting the vision of the ETSI global multimedia mobility (GMM) standardization framework, UMTS service support through non-UMTS access is considered. Consideration of DECT as a UMTS access technology leads to an interworking proposal that presents each DECT terminal to the core network in terms of UMTS functional entities. Access-independent usage of UMTS terminal applications motivates additional interworking in the terminal to encapsulate the access network. The desirability of an access-independent UMTS application programming interface in the terminal is indicated     

效益与服务并举的用户接入网

用户接入网是电信网发展中至关重要的一环，本文从技术和对运营部门及最终用户利益这两个角度，介绍了爱立信公司推出的无源光纤网，无线本地环路、ＤＥＣＴ商用无绳电话系统和综合接入系统等各种用户接入产品。     

CTM和个人通信业务

本文介绍了ＥＴＳＩ最近提出的ＣＴＭ的概念;即基于ＤＥＣＴ技术在ＰＳＴＮ,ＩＳＤＮ的基础上结合ＩＮ技术实现个人通信业务,并给出了ＣＴＭ的网络结构,分析了ＣＴＭ个人通信业务的市场形势,最后介绍了ＣＴＭ在欧洲的发展及应用现状。     

Standardization efforts for wireless LANs

The Digital European Cordless Telecommunications (DECT) draft standard, which is the only wireless local area network (LAN) standard close to the 1-Mb/s data rate is briefly described. Active standards groups and their activities are reviewed. The work of the IEEE working groups for wireless LANs is examined