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.
標簽： HSDPAHSUPA Access Speed Radio UMTS High for
上傳時間： 2020-05-27
上傳用戶：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.
標簽： Performance LTE and its
上傳時間： 2020-05-27
上傳用戶：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.
標簽： Communications MIMO-OFDM Wireless MATLAB with
上傳時間： 2020-05-28
上傳用戶：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.
標簽： Management Strategies Resource Radio
上傳時間： 2020-06-01
上傳用戶：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.
標簽： Evolved Packet Core SAE and the
上傳時間： 2020-06-01
上傳用戶：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.
標簽： Multimedia Subsystem The IMS 3G IP
上傳時間： 2020-06-01
上傳用戶：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.
上傳時間： 2020-06-01
上傳用戶：shancjb
5G-MIMO-OTA測量技術 48頁現代通信為什么需要MIMO ? 頻譜資源嚴重不足，提高頻譜利用率，是當前通信界研究的熱點課 題之一 ? MIMO擴展了一維智能天線技術，具有極高的頻譜利用率，能在不 增加帶寬的情況下成倍提高通信系統的容量，且信道可靠性大為增 強 ? 通過近幾年的持續發展，MIMO技術已經越來越多地應用于各種無 線通信系統。包括3Gpp、CTIA、IC1004在內的多項國際組織制定 MIMO測試標準
上傳時間： 2022-03-01
上傳用戶：
HUAWEI MH5000-31 5G模塊AT命令手冊，用于開發華為MH5000-31模塊使用。本文根據終端設備的需求，實現了國際標準（如 3Gpp 和 ITU-T）中的部分 AT 命 令。本文還描述了終端設備實現的私有 AT 命令接口，私有 AT 命令接口是為了更好 或更方便地實現某種功能。 本文不描述標準已經定義或 MT 已實現，但華為終端產品需求涉及不到的接口。對于 AT 命令接口的描述，僅限于接口數據包本身，以及 TE 和 MT 對接口的使用方法和 使用流程，不包括與接口不直接相關的內容。本文也僅限于描述 TE 和 MT 之間 Rm 接口范圍內的 AT 命令接口，而不描述 MT 與 IWF 之間 Um 接口范圍內的 AT 命 令接口。 AT 命令是 TE 和 MT 之間的通信命令協議。如果有新款 MT 產品需要和現有 TE 對接，而現有 TE 是按照本 AT 規范實現的，則新款 MT 必須遵守此規范才能保證 兩者成功對接。比如新款模塊和現有 PC 統一后臺對接，那么新款模塊必須遵守此規 范；反之亦然，比如新開發某 PC 后臺或 PC 工具，也要遵守此規范，才能和現有的 終端產品對接。若 TE 和 MT 不用 AT 命令通信，則不受本規范限制。
上傳時間： 2022-03-22
上傳用戶：1208020161
SP協議最早由是由 MMUSIC ETI工作組在1995年研究的，由T組織在1999年提議成為的一個標準。SP主要借鑒了Web網的HTP和SMTP兩個協議3GppR5/R6的MS子系統采用SP。3Gpp制定的MS子系統相關規范推動了SP的發展。lETF提出的P電話信令協議基于文本的應用層控制協議獨立于底層協議，可以使用TCP或UDP傳輸協議用于建立、修改和終止一個或多個參與者的多媒體會話。SIP協議是應用層控制（信令）協議SIP協議支持代理、重定向、登記定位等功能，支持用戶移動。SIP協議和其他協議一起給用戶提供完整的服務，包括：RSP（資源預留協議）RTP（實時傳輸協議）RTSP（實時流協議）SAP（會話通告協議）SDP（會話描述協議）SIP支持以下五方面的能力來建立和終止多媒體通訊用戶定位：確定通信所用的端系統位置用戶能力交換：確定所用的媒體類型和媒體參數用戶可用性判定：確定被叫方是否空閑和是否愿意加入通信呼叫建立：邀請和提示被叫，在主被叫之間傳遞呼叫參數呼叫處理：包括呼叫終結和呼叫轉交Proxy代理服務器》為其它的客戶機代理，進行SP消息的轉接和轉發的功能。消息機制與UAC和UAS相似》對收到的請求消息進行翻譯和處理后，傳遞給其他的服務器》對SP請求及響應進行路由■重定向服務器》接收S|P請求，把請求中的原地址映射為零個或多個地址，返回給客戶機，客戶機根據此地址重新發送請求》重定向服務器不會發起自己的呼叫（不發送請求，通過3x響應進行重定向）》重定向服務器不接收呼叫終止，也不主動終止呼叫
標簽： sip協議
上傳時間： 2022-03-30
上傳用戶：kent
