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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These messages deal with setting up, supervising and clearing the call connections. Without reference to the material, draw and label the key components and interfaces of the Nokia 3G Solution. How do we manage the timing between multiple mobile stations in one cell?

By checking the VLR, it recognises the number and so it is able to trace the called subscriber. By December there were 32 GSM networks operating in 18 areas.

Nokia 3G Systra

This development set some requirements concerning the GSM system specifications and these requirements are built 3f the specifications as follows: But who is the user who receives, sends and acts on these messages?

The TDMA timeslots are called “physical channels”, as they are used to physically move information from one place to another. As we do not know the exact location of the subscriber, it seems inevitable that we have to search for him in the entire VLR service area.


This would let the lady know that you are requiring service.

Many different factors have led to a variety of signalling systems being developed in telecommunications networks. A BSS itself may cover a considerably large geographical area consisting of many cells a cell refers to an area covered by one or more frequency resources. The ability to reserve circuits in the outgoing direction. Field-testing is an excellent way of receiving information in different geographical areas.

To sum up, the main functions of NSS are: It has only one basic configuration. It means that the signal can travel longer distances on open water.

00_Table of Contents 3G SYSTRA(Jan-06)

As a result of the analysis, it obtains the HLR address in which the subscriber is permanently registered. The entire SS7 is built on the foundation of this MTP, which consists of three sublayers as shown in the figure below. It can send call set-up messages.

At the receiving end, these packets are reassembled in a sequential order and the original information is recreated.

Referring to the interfaces, the more complicated the interfaces in use, the more intelligence is required between the interfaces in order to implement all the functions required.

Charging records can be generated in: Subscriber verification is performed in the VLR by an authentication process.

If the called subscriber is registered in a location area belonging to his home network, the connection is established as explained in the previous chapter and the calling subscriber pays for the call. The solution to this problem is called “multidrop loop” and instead of a chain we connect the BTSs in the form of a loop.


It is known that in a certain cell area, there are going be subscribers, at any given hour, during these office hours. Every time the network broadcasts the ID of the area, the mobile compares this information to the area ID stored in its memory. As a result of a successful registration, the network sends the mobile station two numbers that are stored in the SIM Subscriber Identity Module card of the mobile station. After the Phase 2 recommendations, GSM continues to evolve at full speed.

The 2 sectorised BTS is suitable for, for instance, providing coverage for a highway. Ki is an authentication key with a length of 32 hexadecimal digits.

It is not the intention of this section to give a complete explanation of all the units in this section, but only a simple overview of them to give an understanding. If we put the transcoder somewhere else, say just after the MSC, we can not get a significant advantage either.

If the time slots of the TDMA frame represent the physical channels, what about the contents? These can be called supplementary services.