By Bates R. B.
You get an easy, orderly presentation of ways GPRS works, the way it connects the web, and the way to enforce it. irrespective of no matter if you wish solutions on structure or complicated interface matters, glance inside of to get the facts:* the full format of GPRS approach structure* The functionality of GPRS components* All layers defined, unpacked, and defined* Interfaces-radio and MS-PCUSN, MS-SGSN, PCUSN-SGSN, SGSN-GGSN, and GGSN-PDNGPRS UNPACKED with no wasted phrases, telecom specialist R.J. "Bud" Bates-whose previous books are classics-clarifies the positive factors, features, and constitution of lightning speedy, always-on GPRS, the 2.5G expertise environment the speed in hand-held entry. You get brilliantly transparent solutions to basic questions-* what's it?* How does it work?* How a lot is it going to price me?GPRS uncovered Get the sensible solutions you must combine, enforce, and let GPRS on your approach for quick, direct instant net access.This special quantity can provide operating info on GPRS and its functions. seriously illustrated, GPRS unearths capabilities, layers, and architecture-information the most important to these delivering or utilizing GPRS.There's no different advisor that provides GPRS anatomy, body structure, and serve as like this one. For an unequaled hands-on handbook to this more and more renowned technology-one that could assist you placed prone in position speedy and profitably-no consultant yet Bud Bates' GPRS will do.
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GSM has two types of channels: ■ The traffic channels used to transport speech and data information ■ The control channels used for network management messages and some channel maintenance tasks The Physical Layer Each physical channel supports a number of logical channels used for user traffic and signaling. The physical layer (or Layer 1) supports the functions required for the transmission of bit streams on the air interface. Layer 1 also provides access capabilities to upper layers. The physical layer is described in the GSM Recommendation 05 series (part of the ETSI documentation for GSM).
However, it is less appreciated that an unprecedented demand exists from worldwide telephone subscribers. It took a century to get 700 million phone lines installed. Another 700 million will be deployed in the next 15 to 20 years—and that could prove to be a conservative estimate. Although the majority of the new deployments will be wireless phones— 700 million of them over the next 10 years—demand for wireline communications is also exploding, driven in part by the need to access the Internet.
25 MHz Figure 1-30 CDMA. 41 User 3 User 2 User 1 transmitting on the old channel, and commences transmitting and receiving on the new channel. It goes without saying that this is known as a hard handoff. In CDMA, however, every phone and every site are on the same frequency. In order to begin listening to a new site, the phone only needs to change the pseudo-random sequence it uses to decode the desired data from the jumble of bits sent for everyone else. While a call is in progress, the network chooses two or more alternate sites that it feels are handoff candidates.