The General Packet Radio Service (GPRS) allows an end user to send and receive data in packet transfer mode within a public land mobile NetWork (PLMN) without using a permanent connection between the mobile station (MS) and the external NetWork during data transfer. This way, GPRS opti- mizes the use of NetWork and radio resources (RRs) since, unlike circuit- switched mode, no connection between the MS and the external NetWork is established when there is no data flow in progress. Thus, this RR optimiza- tion makes it possible for the operator to offer more attractive fees.
上传时间： 2020-05-27
上传用户：shancjb
The telecommunications industry is undoubtedly in a period of radical change with the advent of mobile broadband radio access and the rapid convergence of Internet and mobile services. Some of these changes have been enabled by a fundamental shift in the underlying technologies; mobile NetWorks are now increasingly based on a pure Internet Protocol (IP) NetWork architecture. Since the first edition of this book was published in 2009, a multitude of connected devices from eBook readers to smartphones and even Machine-to-Machine (M2M) technologies have all started to benefit from mobile broadband. The sea change over the last few years is only the beginning of a wave of new services that will fundamentally change our economy, our society, and even our environment. The evolution towards mobile broadband is one of the core underlying parts of this revolution and is the focus of this book.
标签： NetWorks Packet EPC and 4G
上传时间： 2020-05-27
上传用户：shancjb
Free Space Optical Communication (FSOC) is an effective alternative technology to meet the Next Generation NetWork (NGN) demands as well as highly secured (mili- tary) communications. FSOC includes various advantages like last mile access, easy installation, free of Electro Magnetic Interference (EMI)/Electro Magnetic Compatibil- ity (EMC) and license free access etc. In FSOC, the optical beam propagation in the turbulentatmosphereisseverelyaffectedbyvariousfactorssuspendedinthechannel, geographicallocationoftheinstallationsite,terraintypeandmeteorologicalchanges. Therefore a rigorous experimental study over a longer period becomes significant to analyze the quality and reliability of the FSOC channel and the maximum data rate that the system can operate since data transmission is completely season dependent.
标签： Communication Optical System Space Free
上传时间： 2020-05-27
上传用户：shancjb
The recent developments in full duplex (FD) commu- nication promise doubling the capacity of cellular NetWorks using self interference cancellation (SIC) techniques. FD small cells with device-to-device (D2D) communication links could achieve the expected capacity of the future cellular NetWorks (5G). In this work, we consider joint scheduling and dynamic power algorithm (DPA) for a single cell FD small cell NetWork with D2D links (D2DLs). We formulate the optimal user selection and power control as a non-linear programming (NLP) optimization problem to get the optimal user scheduling and transmission power in a given TTI. Our numerical results show that using DPA gives better overall throughput performance than full power transmission algorithm (FPA). Also, simultaneous transmissions (combination of uplink (UL), downlink (DL), and D2D occur 80% of the time thereby increasing the spectral efficiency and NetWork capacity
标签： Full-Duplex Cells Small
上传时间： 2020-05-27
上传用户：shancjb
Providing QoS while optimizing the LTE NetWork in a cost efficient manner is very challenging. Thus, radio scheduling is one of the most important functions in mobile broadband NetWorks. The design of a mobile NetWork radio scheduler holds several objectives that need to be satisfied, for example: the scheduler needs to maximize the radio performance by efficiently distributing the limited radio re- sources, since the operator’s revenue depends on it.
标签： Communications Future Mobile LTE
上传时间： 2020-05-27
上传用户：shancjb
This book is intended for the RF planners, to serve as a practical tool in their daily work designing indoor radio distribution systems. It is not a complete book about all the deep aspects and corners of GSM, DCS, UMTS and HSPA NetWorks, or all the core NetWork systems. It is dedicated to the last 10–70 m of the NetWork, the indoor air interface between the mobile user and the indoor mobile NetWork.
标签： Practical Planning Indoor Guide Radio GSM for
上传时间： 2020-05-27
上传用户：shancjb
With the rapid expansion of wireless consumer products,there has been a con- siderable increase in the need for radio-frequency (RF) planning, link plan- ning, and propagation modeling.A NetWork designer with no RF background may find himself/herself designing a wireless NetWork. A wide array of RF planning software packages can provide some support, but there is no substi- tute for a fundamental understanding of the propagation process and the lim- itations of the models employed. Blind use of computer-aided design (CAD) programs with no understanding of the physical fundamentals underlying the process can be a recipe for disaster. Having witnessed the results of this approach, I hope to spare others this frustration.
标签： Introduction Propagation to RF
上传时间： 2020-05-27
上传用户：shancjb
Fixed-mobile.convergence.and.voice-data.NetWorks.have.merged.next-gen- eration,.value-added.applications.and.integrated.multimedia.services,.com- bining. Web. browsing,. instant. messaging,. presence,. voice. over. IP,. video. conferencing,. application. sharing,. telephony,. unified. messaging,. multi- media.content.delivery,.etc..on.top.of.different.NetWork.technologies..The. convergence.of.the.communications.NetWorks.is.motivated.by.the.need.to. support.many.forms.of.digital.traffic.as.well.as.to.amortize.implementation. and.operational.costs.of.the.underlying.NetWorks..Historically,.the.approach. to. build. and. deploy. multimedia. services. has. focused. upon. single-point. solutions..
标签： Multimedia Subsystem Handbook IMS IP
上传时间： 2020-05-27
上传用户：shancjb
This book addresses two aspects of NetWork operation quality; namely, resource management and fault management. NetWork operation quality is among the functions to be fulfilled in order to offer quality of service, QoS, to the end user. It is characterized by four parameters: – packet loss; – delay; – jitter, or the variation of delay over time; – availability. Resource management employs mechanisms that enable the first three parameters to be guaranteed or optimized. Fault management aims to ensure continuity of service.
标签： Ethernet NetWorks MPLS and IP
上传时间： 2020-05-27
上传用户：shancjb
MobileNetWorkoperatorswillmeetmanychallengesinthecomingyears.Itisexpectedthatthe numberofpeopleconnected,wirelineandwireless,willreachfivebillionby2015.Atthesame time, people use more wireless services and they expect similar user experience to what they can now get from fixed NetWorks. Because of that we will see a hundred-fold increase in NetWork traffic in the near future. At the same time markets are saturating and the revenue per bit is dropping.
标签： Self-Organising NetWorks LTE
上传时间： 2020-05-27
上传用户：shancjb
