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.
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.
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.
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.
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.
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.
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.
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。
