telecom s solution for 3g access networks

... This system, which was subsequently standardized as TIA553, was based on essentially the same technical specifications and design principles as the development system of the trial phase and used ... United States SMS available in GSM 1995 CDMA cellular and PCS technology introduced in the United States 1997 ETSI publishes GPRS standard 1999 Standards for 3G wireless services published Introduction ... GPRS is also now available in GSM CDMA systems, which use direct sequence spread spectrum technology, have been deployed in this country since 1995 Standards for 3G wireless services were published...

Ngày tải lên: 02/03/2013, 16:58

... the students’ responses Module 10: RADIUS as a Solution for Remote Access v Securing a RADIUS Solution A secure RADIUS solution ensures that only authorized remote access clients and servers are ... and Remote Access because the RADIUS client is a remote access server If Remote Access Clients Must • Administer Windows 2000–based servers • Access Web-based applications and FTP servers • Run ... remote access server Include RADIUS in your remote access solution to centralize remote access policies Module 10: RADIUS as a Solution for Remote Access 21 Authenticating Remote Access Clients Slide...

Ngày tải lên: 22/10/2013, 16:15

... 3G ACCESS NETWORK The Cost of Using ATM Switches in the Access ATM access networks are necessary, but expensive, as ATM is an expensive technology Moreover, the installation of a simple ATM switch ... SOLUTION FOR 3G ACCESS NETWORKS ECI Telecom s Solution for 3G Access Networks The cellular communications industry is and has always been an important ECI Telecom target market With this in mind, ... unrivaled solution for deploying 3G access networks It is tailored specifically for the needs of the cellular industry and has a reasonable cost structure The solution is based on the integration of SDH...

Ngày tải lên: 19/04/2014, 19:07

... system so as to serve areas of high traffic density by using smart antennas Possible benefits of using smart antennas in 3G systems have been studied under the auspices of the Technology in Smart ... mobile station First, consider a synchronous CDMA system Since it uses a system-wide timing reference based on the Global Positioning System (GPS), symbols transmitted by individual mobile stations ... Spread Spectrum CDMA Systems for Wireless Communications Boston: Artech House, 1997 [22] S Verdu, “Minimum Probability of Error for Asynchronous Gaussian Multiple -Access Channels,” IEEE Trans...

Ngày tải lên: 18/06/2014, 10:05

... channel, like the reverse access channel just described, also carries layer and MAC messages, and is accessed by mobile stations using the same multiple access scheme Data rates supported include ... Uses channel encoder of rate 1/4 The access channel transmits layer and MAC layer messages from different mobile stations to a base station Multiple users access this channel using a mechanism ... A-bis interface There may be one or more base station controllers in a serving area BTSs and the associated BSCs for a given area are together known as a base station subsystem (BSS) The MSC is...

Ngày tải lên: 18/06/2014, 10:05

... Subsystem—Serving GPRS Support Node (BSS-SGSN) Interface; Network Service [20] GSM 08.18: Base Station Subsystem—Serving GPRS Support Node (BSS-SGSN); Base Station Subsystem GPRS Protocol (BSSGP) ... Center—Base Station Subsystem (MSC-BSC) Interface: Layer Specification [18] GSM 08.14: Base Station Subsystem—Serving GPRS Support Node (BSS-SGSN) Interface; Gb Interface Layer [19] GSM 08.16: Base Station ... random access channel) The network replies by reserving the necessary resources required by the MS and sending a packet immediate assignment message In this case, the access method completes in a single...

Ngày tải lên: 18/06/2014, 10:05

... 12 RACH subchannels, each containing five access slots The UE may select any one of these slots on the available RACH subchannels within an access service class and commence transmission The ... describe only one of them, namely the one that controls transmissions on a RACH AM FL Y Transmission Control on a RACH For the purpose of accessing this channel, the access slots and preamble signatures ... uses a number of system parameters including, among others, preamble scrambling code, available RACH subchannels for each access service class, the maximum number of preamble retransmissions,...

Ngày tải lên: 18/06/2014, 10:05

... subscriber server (HSS), which is similar to the HLR of 2G and 2Gϩ networks, is a database of all subscribers to the home system It contains the user identity, call features and services subscribed ... channels to be used for signaling purposes within the system, options supported by the system, cell selection parameters, and so on The protocol responsible for providing RR messages between an MSC ... Telecommunications Industry Association/Electronics Industry Association (TIA/EIA) standard IS-41 [5], which is shown in Figure 7-1 This also represents the network for the first generation systems that support...

Ngày tải lên: 18/06/2014, 10:05

... RESV messages and determines if it has enough resources to meet the desired QoS If it does, it assigns a service class to the user s packets corresponding to the requested QoS, reserves necessary ... service class of each packet is examined If the associated service class matches the service class assigned in the request phase, the packet is treated for forwarding purposes using the scheduler ... objects: INTEGRITY, SESSION, RSVP_HOP, TIME_VALUES, RESV_CON- Figure 9-7 Message formats of RSVP messages Examples of objects are ADSPEC, FLOWSPEC, and so on Each object specification is of variable...

Ngày tải lên: 18/06/2014, 10:05

... Association of Radio Industries and Business ARP Address Resolution Protocol ARQ Automatic Repeat Request AS Access Stratum ASC Access Service Class ATM Asynchronous Transfer Mode AUC Authentication ... chapter, we have discussed QoS issues and concepts and described how it can be provided in 3G UMTS networks Providing the QoS usually consists of four steps: requesting resources from the network ... address However, it is still necessary to Quality of Service (QoS) in 3G Systems 329 reserve resources along the new route, and packets may be lost as resources are being reserved Summary In this...

Ngày tải lên: 18/06/2014, 10:05

... SMG Special Mobile Group SMS Short Messaging Service SM-SC Short Messaging Service Center SMS-IWMSC SMS Interworking MSC SMS-GMSC SMS Gateway MSC SNDC Subnetwork-Dependent Convergence SNDCP Subnetwork-Dependent ... filters, 91 broadcast common channel, cdma2000, 144 broadcast control channels, GSM, 169 BSCs (Base Station Controllers), GSM, 158 BSS (Base Station Subsystem), GSM, 158 BSSGP (Base Station System ... Multiple Access DSCH Downlink Shared Channel DSCP Differentiated Service Code Point DSMA-CD Digital Sense Multiple Access with Collision Detection DSP Digital Signal Processing DSSS Direct-Sequence Spread...

Ngày tải lên: 18/06/2014, 10:05