The first Third Generation Partnership Project (3Gpp) Wideband Code Division Multiple Access (WCDMA) networks were launched during 2002. By the end of 2005 there were 100 open WCDMA networks and a total of over 150 operators having frequency licenses for WCDMA operation. Currently, the WCDMA networks are deployedinUniversalMobileTelecommunicationsSystem(UMTS)bandaround2GHz in Europe and Asia including Japan and Korea. WCDMA in America is deployed in the existing 850 and 1900 spectrum allocations while the new 3G band at 1700/2100 is expected to be available in the near future. 3Gpp has defined the WCDMA operation also for several additional bands, which are expected to be taken into use during the coming years.
标签： HSDPAHSUPA Access Speed Radio UMTS High for
上传时间： 2020-05-27
上传用户：shancjb
This books attempts to provide an extensive overview on Long-Term Evolution (LTE) networks. Understanding LTE and its Performance is purposely written to appeal to a broad audience and to be of value to anyone who is interested in 3Gpp LTE or wireless broadband networks more generally. The aim of this book is to offer comprehensive coverage of current state-of-the-art theoretical and techno- logical aspects of broadband mobile and wireless networks focusing on LTE. The presentation starts from basic principles and proceeds smoothly to most advanced topics. Provided schemes are developed and oriented in the context of very actual closed standards, the 3 GPPP LTE.
标签： Performance LTE and its
上传时间： 2020-05-27
上传用户：shancjb
MIMO-OFDM is a key technology for next-generation cellular communications (3Gpp-LTE, Mobile WiMAX, IMT-Advanced) as well as wireless LAN (IEEE 802.11a, IEEE 802.11n), wireless PAN (MB-OFDM), and broadcasting (DAB, DVB, DMB). This book provides a comprehensive introduction to the basic theory and practice of wireless channel modeling, OFDM, and MIMO, with MATLAB ? programs to simulate the underlying techniques on MIMO-OFDMsystems.Thisbookisprimarilydesignedforengineersandresearcherswhoare interested in learning various MIMO-OFDM techniques and applying them to wireless communications.
标签： Communications MIMO-OFDM Wireless MATLAB with
上传时间： 2020-05-28
上传用户：shancjb
It is more than a decade since GSM was first commercially available. After some unexpected delay, it seems that finally UMTS is here to stay as a 3G system standardised by 3Gpp, at least for another ten years. UMTS will enable multi-service, multi-rate and flexible IP native-based mobile technologies to be used in wide area scenarios and also pave the way for a smooth transition from circuit switched voice networks to mobile packet services.
标签： Management Strategies Resource Radio
上传时间： 2020-06-01
上传用户：shancjb
The outcome of the 3Gpp SAE (system architecture evolution) technical study and specification work is a set of standards that specifies the evolution of the packet core network for GSM/GPRS and WCDMA/HSPA to an all-IP architec- ture and enables a feature-rich ‘common packet core’ for radio accesses devel- oped within 3Gpp and also by other standardization fora.
标签： Evolved Packet Core SAE and the
上传时间： 2020-06-01
上传用户：shancjb
When 3Gpp started standardizing the IMS a few years ago, most analysts expected the number of IMS deploymentsto grow dramatically as soon the initial IMS specifications were ready (3Gpp Release 5 was functionallyfrozenin the first half of 2002and completedshortly after that). While those predictions have proven to be too aggressive owing to a number of upheavals hitting the ICT (Information and Communications Technologies) sector, we are now seeing more and more commercial IMS-based service offerings in the market. At the time of writing (May 2008), there are over 30 commercial IMS networks running live traffic, addingup to over10million IMS users aroundthe world; the IMS is beingdeployedglobally. In addition, there are plenty of ongoing market activities; it is estimated that over 130 IMS contracts have been awarded to all IMS manufacturers. The number of IMS users will grow substantially as these awarded contracts are launched commercially. At the same time, the number of IMS users in presently deployed networks is steadily increasing as new services are introduced and operators running these networks migrate their non-IMS users to their IMS networks.
标签： Multimedia Subsystem The IMS 3G IP
上传时间： 2020-06-01
上传用户：shancjb
This book is an outgrowth of the pioneering development work done by InterDigital Com- munication Corporation in 3rd Generation TDD WCDMA Technology. Many engineers and managers were involved in this development, which spanned a wide range of tech- nology areas, including system architecture, radio interface, radio modem design, radio resource management and hardware/software implementation. In addition, TDD WCDMA technology had many direct and indirect contributors across the globe in the context of the development of the 3Gpp TDD WCDMA Standard.
上传时间： 2020-06-01
上传用户：shancjb
5G-MIMO-OTA测量技术 48页现代通信为什么需要MIMO Ø 频谱资源严重不足，提高频谱利用率，是当前通信界研究的热点课 题之一 Ø MIMO扩展了一维智能天线技术，具有极高的频谱利用率，能在不 增加带宽的情况下成倍提高通信系统的容量，且信道可靠性大为增 强 Ø 通过近几年的持续发展，MIMO技术已经越来越多地应用于各种无 线通信系统。包括3Gpp、CTIA、IC1004在内的多项国际组织制定 MIMO测试标准
上传时间： 2022-03-01
上传用户：
HUAWEI MH5000-31 5G模块AT命令手册，用于开发华为MH5000-31模块使用。本文根据终端设备的需求，实现了国际标准（如 3Gpp 和 ITU-T）中的部分 AT 命 令。本文还描述了终端设备实现的私有 AT 命令接口，私有 AT 命令接口是为了更好 或更方便地实现某种功能。 本文不描述标准已经定义或 MT 已实现，但华为终端产品需求涉及不到的接口。对于 AT 命令接口的描述，仅限于接口数据包本身，以及 TE 和 MT 对接口的使用方法和 使用流程，不包括与接口不直接相关的内容。本文也仅限于描述 TE 和 MT 之间 Rm 接口范围内的 AT 命令接口，而不描述 MT 与 IWF 之间 Um 接口范围内的 AT 命 令接口。 AT 命令是 TE 和 MT 之间的通信命令协议。如果有新款 MT 产品需要和现有 TE 对接，而现有 TE 是按照本 AT 规范实现的，则新款 MT 必须遵守此规范才能保证 两者成功对接。比如新款模块和现有 PC 统一后台对接，那么新款模块必须遵守此规 范；反之亦然，比如新开发某 PC 后台或 PC 工具，也要遵守此规范，才能和现有的 终端产品对接。若 TE 和 MT 不用 AT 命令通信，则不受本规范限制。
上传时间： 2022-03-22
上传用户：1208020161
SP协议最早由是由 MMUSIC ETI工作组在1995年研究的，由T组织在1999年提议成为的一个标准。SP主要借鉴了Web网的HTP和SMTP两个协议3GppR5/R6的MS子系统采用SP。3Gpp制定的MS子系统相关规范推动了SP的发展。lETF提出的P电话信令协议基于文本的应用层控制协议独立于底层协议，可以使用TCP或UDP传输协议用于建立、修改和终止一个或多个参与者的多媒体会话。SIP协议是应用层控制（信令）协议SIP协议支持代理、重定向、登记定位等功能，支持用户移动。SIP协议和其他协议一起给用户提供完整的服务，包括：RSP（资源预留协议）RTP（实时传输协议）RTSP（实时流协议）SAP（会话通告协议）SDP（会话描述协议）SIP支持以下五方面的能力来建立和终止多媒体通讯用户定位：确定通信所用的端系统位置用户能力交换：确定所用的媒体类型和媒体参数用户可用性判定：确定被叫方是否空闲和是否愿意加入通信呼叫建立：邀请和提示被叫，在主被叫之间传递呼叫参数呼叫处理：包括呼叫终结和呼叫转交Proxy代理服务器》为其它的客户机代理，进行SP消息的转接和转发的功能。消息机制与UAC和UAS相似》对收到的请求消息进行翻译和处理后，传递给其他的服务器》对SP请求及响应进行路由■重定向服务器》接收S|P请求，把请求中的原地址映射为零个或多个地址，返回给客户机，客户机根据此地址重新发送请求》重定向服务器不会发起自己的呼叫（不发送请求，通过3x响应进行重定向）》重定向服务器不接收呼叫终止，也不主动终止呼叫
标签： sip协议
上传时间： 2022-03-30
上传用户：kent
