Study On Deeply Coverage Of GSM Network

1. IntroductionAlong with the high speed of the society economic development, new skyscraper,such as luxurious hotel and retaraut,supermarket and large apartment etc., the underground structure,such as subway,ground floor and underground parking etc., flows out in great quantities now, make the mobile be using frequently indoor to increase.Customer already no longer satisfied with the communications outdoors services, also request the better and indoor communications service.The indoor communications exists a few problems as follows:First,the coverage aspect, because of the indoor complicated structure, the building itself shield with absorb function, make wireless electric wave more to be consumed, become to move signal of weak field strong area even blind area, cause the ground floor in the mansion,and two strong weaker, even exist some blind areas.In order to overlaying indoorly not good, easy emergence the mobile drop the phenomenon of the net, result in and look for and shout and respond to.Secondly,the quality aspect, building the high space exists wireless frequency interference easiest, serving small area signal unsteady, appear ping-pong to cut over an effect, the words sound quality hard assurance, and appear to break a sound and drop words phenomenon.The third,the capacity aspect, building such as large shopping market,the meeting center, because of more mobile usage the density lead greatly, the partial network capacity can't satisfy the customer's need, The channel will be congestion.The indoor depth overlays is mainly depended on an existing network of outdoors to overlay currently of extension method, if keep put high way of the station method,outdoors big power base station method,the antenna.But so of resolve a way to bring a following problem:In order to wearing to exhaust deeply greatly, indoor depthThe adoption keeps put the station method, give or get an electric shock to the source signal even have high request, and hand over to adjust interference with together the interferences of neighbor all compare severity, converse the quality is difficult in assurance, control not good, will influence the whole quality of net.The adoption keeps put the station and outdoors base station have no root to resolve the capacity problem, the network capacity is limited, the connection rate is low;The antenna installs a too high meeting to bring more area to overlay, influencing the whole net quality;The outdoors small area increment frequency, the frequency programming is difficult, the network capacity growth difficulty;The indoor depth overlays to exist an above-mentioned problem, so appear understanding indoor depth to definitely overlay of solution. Indoor depth's overlay is aim at indoor customers and used for improving building inside move the correspondence environment of a kind of successful project, indoor depth's overlaying the system its principle is the signal that makes use of indoor antenna to distribute system and wills move the base station is even to distribute each corner indoors, thus promising the indoor district owns ideal signal to overlay.Applied the projects can bring of the result :The first,can compare to improve the converse quality in the building completely, the exaltation moves the telephone connection rate, developping an indoor ambulation of the high quality correspondence district;The second,use tiny beehive system and can share the outdoors great beehive words, the extension network capacity.,resolve a high interference problem.Such as:The key figures in mansion, many signals of areas with small outdoorses have already gone directly to path to arrive indoor, come from each signal of the direction an electricity even and higher, the interference is big, can hardly have cleanly the letter way of be free from the interference.The way of solve overlays with the indoor depth, depending to satisfy a higher C/I value, acquiring the indoor ambulation correspondence service of the higher quality. Overlay to the indoor depth, the exportation power of the antenna is very low, the produce that pluses the building outside wall reduce, so indoor small area to outdoors the influence of the small area is very limited.2. The research conceptThe indoor coverage is a programming that is divided into a few different stages.First it want what to do is the target building that finds out to meet coverage.The place that needs indoor coverage is usually overlay bad large building,hotel,office building,underground parking etc., also have the words amount of high large and indoor place, such as station, airport, market, gymnasium, shopping center etc..At the first step stood to order investigate after, carry on a station to order of investigate in detail.Carry on a detailed design immediately after, then the equipments install, after installing completion, wireless network programming the personnel still needs to carry on a test with excellent turn,whether it attained an expectation request.3. ConclusionThe microcellur technique is a kind of technique to raise the microcell network system capacity It is a valid method.It is also an extension of the existing mobile network, playing an important role in the wireless correspondence the set of the network.Vivid circulate microcell technique, constuct a mobile network of high quality, to raise the system utilization regardless, still improve the network depth coverage,It can obtain good result.