By Thomas Toftegaard Nielsen
As a result of the explosive international development within the variety of cellular subscribers, in addition to the expansion estimated within the cellular facts section, the necessity for stronger spectrum potency at the radio interface turns into progressively more vital. Frequency hopping (FH) is a good strategy for bettering the spectrum potency. one of many merits of FH is that it may be mixed with different spectral potency enhancing positive aspects like strength keep watch over, handover and reuse partitioning. functionality improvements in a Frequency Hopping GSM community covers FH and a few of the extra positive factors intimately. It starts off with an in-depth description of the fundamental suggestion of FH on hyperlink point in addition to on approach point. various tools were used for research, akin to hyperlink point simulations, community point simulations and vintage tele-traffic idea. targeted good points of functionality improvements in a Frequency Hopping GSM community: Combines the sensible stories of operator and seller with extra theoretical study tools. An in-depth therapy of winning difficulties in GSM networks; Presentation of a brand new procedure, computer-aided community layout (CAND), which has been constructed to examine the complicated community buildings of a GSM community. CAND presents the chance for extra lifelike functionality reviews than traditional tools; presents GSM-specific research of performance advancements in continual regulate, discontinuous transmission, and a number of other handover algorithms; rationalization of the standard and means earnings of beneficial properties just like the blend of FH and reuse partitioning, referred to as clever frequency hopping; A frequency making plans procedure for FH GSM networks is gifted. this system exploits the advantages from FH at once within the allocation technique, expanding the general frequency plan.
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Additional info for Performance Enhancements in a Frequency Hopping GSM Network
This second method has been carried out and is described in the following . For simplicity, it is assumed that the errors in a burst are uniformly distributed. In other words, it does not matter whether the entire burst or half a burst is used in the simulations. The number of errors in a burst therefore corresponds to twice the number of errors in a half-burst. This assumption is true for mobile speeds of less 48 Performance Enhancements in a Frequency Hopping GSM Network than 100 km/h. If the speed exceeds this value more errors starts to occur in the tail and head of bursts .
4 Data Services for GSM As described in Chapter 1, the current system evolution of GSM primarily treats the issue of migrating towards the third generation systems like UMTS. This migration consists of a large number of projects including improved voice coding and advanced data transmission services. The goal of these new data transmission services is to offer higher data-rates and make the network more flexible when considering the issue of offering various mobile data services. Two of the most important projects are GPRS and EDGE.
Also 3 different frequencies are used in the hopping sequences. e. the hopping sequences are orthogonal. Furthermore, it can be derived from general pseudorandom characteristics that two channels having different HSN, but the same frequency list and the same time slot, will interfere in 1/n of the bursts, where n is the number of different frequencies in the hopping sequence. This means that frequency hopping in some sense averages the interference out throughout the network. A Brief Introduction™ to the GSM System 29 Restrictions are applied to some of the control channels.
Performance Enhancements in a Frequency Hopping GSM Network by Thomas Toftegaard Nielsen