By Gerardo Gomez, Rafael Sanchez
ISBN-10: 0470011807
ISBN-13: 9780470011805
This accomplished source features a special technique for assessing, studying and optimizing End-to-End provider functionality less than diversified mobile applied sciences (GPRS, aspect, WCDMA and CDMA2000). It contains instructions for interpreting a variety of assorted companies, together with FTP, internet streaming and POC, together with examples of study and troubleshooting from a person point-of-view. specializes in the end-user viewpoint, with a close research of the most resources of carrier functionality degradation and a entire description of cellular information servicesIncludes a close presentation of established key functionality symptoms (KPIs) that are re-defined to conform with each one specific networkProvides carrier functionality benchmarking for various applied sciences from genuine networksExplores a brand new method of provider administration often called patron event administration, together with the explanations why it really is overcoming conventional carrier administration and its influence on sales and client satisfactionIllustrates all issues all through utilizing genuine international examples gleaned from state of the art researchThis e-book attracts jointly findings from authoritative resources that would entice mobile community operators and proprietors. The theory-based, functional strategy can be of curiosity to postgraduate scholars and telecommunication and consulting businesses operating within the box of mobile applied sciences.
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Sample text
For example, the F-DCCH, which carries critical signaling information, may be in SHO, while the associated F-SCH operation could be based on a best cell strategy. Due to the bursty nature of packet data, it is very inefficient to dedicate a permanent TCH to a packet data call. SCHs can be assigned and de-assigned at any time by the base station. The SCH has the additional benefit of improved modulation, coding and power control schemes. 2 kbps for Rate Set 1 rates). Note that each sector of a base station may transmit multiple SCHs simultaneously if it has sufficient transmit power and Walsh codes.
In case of moderate FER, RLP usually can recover the data and no TCP retransmission is needed. RLP retransmissions consume part of the bandwidth and thus reduce the total throughput. Under bad radio conditions the RLP will get exhausted due to excessive amount of NACKs which easily leads to TCP slow start and retransmissions. At very severe FER conditions, the TCP timeout can cause the whole transfer to be halted. e. streaming over UDP), this effect can cause great degradation of the user quality.
Nowadays, GSM accounts approximately for 80% of the world’s 2G networks. The open protocols strategy, as well as a continued improvement of the system with enhancement features such as Frequency Hopping, Adaptive Multi-Rate (AMR), and in the current times Single Antenna Interference Cancellation (SAIC) have been very important for this success. The original GSM has evolved into a family of standards (3GPP) that includes several technologies, which have been designed to be coexisting as complementary systems.