| Although the mobile communication popularization, the GSM systemalready was becoming the maturest second generation of mobile communicationsystem, global overwhelming majority migration operation business all uses thiskind of system. Our country GSM network has started commercial since 1993,has obtained the astonishing development. At present, our country GSM networkuser already surpassed 300000000, the network scale and the capacity all issituated the world first.Along with the motion network swift and violent development, the networkgrade of service question already more and more received people's attention.Improves the network quality, the improvement network cover, not only may setup the operation business in the user mind good image, can strengthen theenterprise competitive power, continues the development for the enterprise toprovide the powerful strut. How fully uses the existing network resources, thepromotion network quality, is has the huge economic efficiency and relates theimportant topic which develops to the enterprise. Many mobile communicationoperation aspect already formed in our country, the competition unprecedentedwas intense, how enabled the network to achieve the best running status, providedthe high grade network service for the user, has become the network operationbusiness the most important task. Meanwhile already started to third generationcorrespondence network evolution, was completely incompatible as a result ofthe WCDMA space connector and GSM, the GSM wireless network gradually bythe third generation wireless network substitution, the GSM wireless networkexcessively investment is increased the cost risk. Carries on the appraisal and theoptimization to the network resources disposition, the promotion networkserviceability and the grade of service, already became the operation business thecore competitive power, some international famous operation business alreadyinspected the network resources use factor as the key indicator the network totransport Uygur.How reasonably uses and the disposition existing network equipment, theresources and the capacity, maximum limit enhances the network the averagegrade of service, enhances the benefit, as well as how causes the network in theunceasing developing process, can maintain the network the grade of service notto drop, these requests enable the mobile communication network the networkoptimization work to become the mobile communication operation businessenhancement service level, the safeguard correspondence quality important workcontent.The GSM network optimization work is refers to the official investmentmovement GSM network carries on parameter gathering, the data analysis,discovers the influence network movement quality the reason, and or adoptscertain technical methods through the parameter adjustment to enable the networkto achieve the best running status, causes the existing network resources gain bestbenefit, at the same time also will propose the rationalization proposal to theGSM network next maintenance and the plan construction. The networkoptimization work is a complex arduous systems engineering, enters in ourcountry GSM migration network lowly constructs the high maintenance the stage,the network optimization work appears especially important and is urgent. Thenetwork optimizes also is long-term and the complex process, it passes through inthe network development entire process.Yingkou moves the GSM network to have been through repeatedly 10 yearsdevelopment, The user scale ever to 10,000 does not develop to the present morethan 500,000 households, develops from the initial several base depots to thepresent more than 300 base depots, the network cover from the initial main city,the county, the area develops to the Yingkou area 90% above village.Along with GSM user's unceasing increase,Although has adopted each kindof antijamming technology and increases the capacity the technology, but theGSM900M limited frequency band already could not satisfy the user the highspeed growth, thereupon introduced the DCS1800 system gradually and forms apair the frequency network with the GSM900M construction, largely enhancedthe system capacity. But the double frequency network which brings along with itoptimizes to us transports Uygur to work actually proposed the challenge. Weadopt the optimization plan is: Altogether stands using and 900M the site torealize the 1800M base depot independently to become the net cover to the hotspot region, through the increase to 1800M compensating, the double frequencynetwork hand-off control algorithm adopts 900 networks to use 爱立信 to the1800M network to cut the K algorithm, use Motorola 1,800 networks to the900M network to cut algorithm 3, cuts the establishment regarding each kind ofreason, has used the power budget algorithm only, cuts regarding other reasonscloses completely. Solved the 1800M absorption telephone traffic lowly, hasaltogether stood the cut to be frequent and so on the conventional question, bothalleviated the network jam, has guaranteed the voice quality, and raised the radioequipment rep use factor.In order to alleviate the Yingkou network to face the traffic load notbalanced to grow and between the network capacity bottleneck contradiction.Yingkou has begun using the dynamic half speed rate function. But the half speedrate technology during enhancement wireless network capacity, the dialoguesound quality and the system voice dropout rate has the certain degree actuallythe influence, is big regarding the telephone traffic jam, the frequent long-termhigh telephone traffic plot not suitably solves the capacity problem through theuse dynamic half speed rate,Otherwise finally will cause the voice drop in quality,will affect the network competitive power. We adopt the half speed rateapplication method is: Does not have when the jam uses the full speed ratechannel, at this time guarantees the best connection quality and the best networktarget. Once monitors according to the prompt telephone traffic statistics to thejam occurs (during most hour telephone traffic statistics gap is 5 minutes), opensthe half speed rate immediately, adjusts (when the plot half speed rate parameterCELLOAD value CELLOAD is refers to use half speed rate function, whensystem examines to full speed rate idle channel achieved definition percentage,will use half speed rate voice encoding method), solution jam question. Hadended after the jam, closes the half speed rate immediately.Yingkou is a coastal city, solves the good coastal depth cover problem to beable to bring the good social efficiency and the economic efficiency. Throughtests the plot expansion and the power strengthens the function to the sea levelcover influence, the test contrasts single plot UNDERLAID and the OVERLAIDlamination cover and the double plot coast cover effect, we open the plotexpansion and the power to the coastal base depot strengthen the function, usesplot OVERLAID and the UNDERLAID lamination way completes the Yingkoucoast sea level the cover. This kind of plan may while provide the broad cover,also reduces in the capacity as far as possible the loss.Whether does the day feed the system performance good direct influenceentire migration network cover scope and the cover quality, the day feeds thesystem optimization is the entire network optimizes the most foundation part, thefunction especially is important. This article through feeds the systemoptimization to three platforms base depots day and partial omnidirectionalstations iron tower tower transforms these two special cases the analysis tointroduce that, fed the system optimization to the day to conduct the deeper levelresearch and the discussion.This article bases the Yingkou migration practical work, is take meets thecustomer need as the goal, strengthens the network to optimize the finemanagement, the greatest degree optimization network resources, enhances thenetwork efficiency, reduces the investment cost is the goal, analyzed andsummarizes summarized several kind of quite typical GSM wireless networkoptimization plan, was worth the field colleague carrying on the model and theapplication in the daily optimized process. |
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