By Gunnar Heine
This leading edge new e-book explains how GPRS (general packet radio provider) permits you to extend your GSM networks in the direction of 3rd iteration cellular communications to fulfill the calls for of the most-sophisticated cellular facts functions. The e-book concentrates on the interfaces among the identified GSM community parts and the recent subsystems -- PCU, SGSN, and GGSN -- that include GPRS. It bargains you an in-depth rationalization of the extensions and techniques of the GSM air interface useful for GPRS and exhibits how the channel-oriented GSM is associated with the packet switched GPRS. in addition, it explains what extensions there are in channel coding, how assets are allotted on the air interface, and the way the short community entry precious for GPRS is made attainable.
This helpful reference grants the facility to simply and quickly penetrate commonplace layout and operation problems with GPRS. It permits you to appreciate the diversities among many of the 2.5 G extensions of GSM, delivers an organization snatch of the consequences of cellular information providers and the way they range from typical velocity companies, and obviously conveys the excellence among circuit-switched and packet-switched applied sciences. The publication additionally addresses replacement bandwidth configurations, HSCSD and facet, and the TCP/IP protocols now utilized in GSM. They finish with an in depth description of many of the situations of GPRS and HSCSD, all of that are of serious worth to the specialist in day-by-day paintings.
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Additional resources for GPRS: Gateway to Third Generation Mobile Networks
The presence of the BCCH/SYS info 13 will be announced in advance in at least one of BCCH/SYS info 3, 4, 7, or 8. Whether the BCCH/SYS info 13 actually contains GPRS-specific cell information or merely a pointer to a packet broadcast control channel (PBCCH; to be discussed in further detail later) depends on the presence of a PBCCH. 2 The 26 Multiframe The 51 multiframe was presented in the previous section as a time basis for circuit switched control channels. We shall now turn to the 26 multiframe as a time basis for all circuit switched traffic channels.
615 ms. Note that this means that the ciphering sequence changes with every burst to be transmitted because the FN also changes with each burst. 27 The process of data encryption in GSM. 34 GPRS: Gateway to Third Generation Mobile Networks AM FL Y number and greater security due to a considerably longer cycle. 12 sec and not every 3 hours 28 minutes. Before encryption and after interleaving, the 456 convolutionally coded bits of a block are in the correct order and ready for actual transmission.
In other words, the shorter the actual data block is, the more unpleasant the tail bits are. This disadvantage was not eliminated with the standardization of GPRS. It was, however, eliminated with the introduction of EDGE. , also for GPRS). To put it simply, it is a 4-bit shift register whose outputs are connected appropriately. 24. Consequently, the convolutional coder has two outputs, which is why it is called a 1:2 (half ) rate convolutional coder. 24 does not illustrate the actual convolutional coder, but is merely intended to show its approximate construction.
GPRS: Gateway to Third Generation Mobile Networks by Gunnar Heine