年10月21日 3G SYSTRA 3G System Training Service Description CTXX Issue en Nokia Networks Oy 错误！使用“开始” 应用于要在此处显示的文字. 3G SYSTRA. Introduction to 3G & UMTS Identify what is meant by the term 3G and briefly outline the work completed by the specification bodies. Furthermore. Directory: 3G/4G develop. Plat: PDF Size: KB Downloads: 4. Upload time: Uploader: joyraj. Description: This book on 3G system.
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This means that if the mobile station or base station transmits a burst only when the time slot appears, then when the burst arrives at the other end, it will cross onto the time domain of the next timeslot, thereby corrupting data from both sources.
3G-Systra This book on 3G system .practical book. –
There are fixed databases that maintain basic information about their customers, including data on their current location, and temporary databases storing information about the users who are currently located in their service area.
We will discuss the DX shortly, but let us first examine some other differences. The TDMA frame can be compared to the vehicle in our example.
GSM is a more secure system than analogue systems with respect to subscriber information and transmission. Services Basic Supplementary services services Bearer Teleservices services However, if a person registers as a GSM subscriber and buys a mobile station, he takes it for granted that at least the speech service is guaranteed after all, that is the reason why he bought the phone in the first place.
But why do we need to interrogate instead of connecting right away? Furthermore, the student should gain a basic understanding of the different types of the air interface and list the key benefits of UMTS for the operator and the end user. Therefore, to enable the traffic connection, maybe two MSCs will have to be connected. Ciphering is also carried out for security reasons. To sum up, the main functions of NSS are: Figure shows the PrimeSite size in comparison to a mobile station, and Figure shows some typical PrimeSite applications.
Over the years, there has been a vast improvement in signalling technology and the lady operator has long since been replaced by automatic digital switching exchanges. All these signalling channels are called dedicated control channels.
The remaining nine are various control channels used to transfer information related to call set-up. The network receives the request and registers the mobile in the new VLR area. Depending on whether the reflected signal comes from near or far, the effect is slightly different.
To solve these problems, that is, to determine the traffic sytsra, we have to calculate the number of Erlangs. All the mobile stations in the LA receive the paging signal, but only one of them recognises the identification and answers to it. With such levels of interference, complex equalisation techniques are required with GMSK.
If we go back to the analogy of the army, the road is the radio carrier frequency, the vehicle is the TDMA frame and the seats in each vehicle are the TDMA timeslots. Before an operator starts to use the security functions, the mobile subscriber is created in the Authentication Centre. The hotel is an establishment that provides services. This module will offer general information on signalling procedures used within UMTS.
The figure below illustrates the TDMA principle. The radio carrier frequencies are arranged in pairs and the difference between these two frequencies uplink-downlink is called the duplex frequency. After listening to your answer, she would try to connect you to the person you wanted to talk with.
The order in which the mobile station should change the frequencies is called the “frequency hopping sequence”. Since the distance between two antennas is a few metres, it can only be implemented at the Base Transceiver Station. When either systrq base transceiver station or mobile station transmits user information, the information contained in the burst is not all user data.
All the GSM networks operate in the same way as explained in the preceding chapters. The VLR receives the request and confirms the registration of the mobile in the same location area.
This data is required for routing calls. This includes the design of a transmission network see for instance chapter 5. Based on this delay value, the Base Transceiver Station informs the mobile station to either advance or retard the time alignment by sending the burst sustra before the actual time slot. Consider what would happen if there is a malfunction somewhere along the line and the chain breaks. There are four types of handovers: The passport is also a database – a small one, though – and the receptionist analyses the data recorded in it.
They are used for call set-up, sending measurement reports and handover. Systga is used in authentication, A8 is used in generating a ciphering key and A5 is used in ciphering. It supports the GSMand frequency bands. Setting up a call appears to be a quick and simple operation, but if we study the process more closely, we discover that it consists of a considerable number of sub-operations.
The entire SS7 is built on the foundation sysra this MTP, which consists of three sublayers as shown in the figure below.
00_Table of Contents 3G SYSTRA(Jan-06)
The TransCoder TC is a BSS element taking care of speech ststra, that is, it is capable of converting speech from one digital coding format to another and vice versa. Explain the terms carrier, spreading, power, FDD, cell characteristics, channelisation code, and scrambling code List and identify the structure of the UMTS air interface.
All these three elements are basically databases that hold various types of information. The connection between the mobile station and the GSM network is fully digital.
SYSTRA Training Document | Muhammad Suleman Khan –
Roaming agreements between systda operators were established. A subscriber in a fixed network dials a number of a mobile phone.
Which of the following is not a signalling function? For a switch with relatively low traffic, the STU can also collect charging data, but for switches which handle high traffic, the CHU Charging Unit is needed to collect charging data.
The BTS is also responsible for power control in down link direction. A reflected signal that has travelled some distance causes “inter symbol interference” whereas near reflections cause “frequency dips”.
The HLR sends the result back, which may be the final result or some other messages might also follow or it might not be the last result.