Research Of TD-LTE Indoor Distribution System

LTE is a pure data network, It realizes the packet switching transmission of servicedata. The bandwidth of LTE can be configure Dynamically, and the bandwidth size canbe1.4MHz,3MHz,5MHz,10MHz,15MHz and20MHz. Also LTE has the ability ofdynamic resource allocation, which can reasonably allocate resource to a user according tothe needs of services and the network resource occupancy. LTE can meet the needs ofservices better than any other networks.Recently, the Technology of M2M and Internet is growing fast and interactiveservices, multimedia applications are used more widely, the processing speed and The userexperience of intelligent terminals are both achieve a qualitative leap. LTE with thebroader bandwidth, higher frequency spectrum resource utilization rate and higher transmittrate which make the users prefer to use wireless broadband services. According to theforecasting Consultancy, in2016the data services will be15times commpared to2013,The possession of the proportion of data business will far exceed the voice business,accounted for70%of the total business. And also more than80%of the volume of businesswill occur in the interior.At present, three wireless communication operators of China have already realized thecoverage of outdoor area, how to realize the indoor area coverage and improve the indoornetwork quality will be a prerequisite that operators use to improve market competitionability, enterprise efficiency and consolidate market share, ultimately realize sustainabledevelopment. But now there are many problems in indoor distribution system:(1) The test passing rate is relatively low of the indoor distribution system, some ofthe signal sources are off the network and some distrbution system is fault;(2) The coverage of A class bulidings is low, among them the coverage of nonresidential area is86.86%, and the coverage of residential area is63.78%;(3) With the coexistence of2G,3G,4G and WLAN, it will increase the cost ofconstruction cost to bulid a set of indoor distribution system for each network;(4) Now the operability of indoor distribution system for LTE is weak which limits the maneuverability of network planning under multi networks.In this paper we analysis the construction method of indoor distribution system basedon2G and3G network, and proposes a construction scheme of LTE indoor distributionsystem in typical scenarios. First, this paper research the coverage ratio of3G indoordistributed system and the traffic absorption ratio and the construction types of indoordistributed system of XX city. This paper also analyzes the business needs and the existingproblems and the key construction of indoor distribution system. Secondly, this paperstudies the wireless link budget and the propagation loss model and the indoor distributionplanning method of indoor distributed system. On this basis, this paper designs the indoordistribution system for the royal park inn hotel, including the source system, the indoordistribution system, the antenna feeder system and the eaquipments layout. In the end wetests the relevant coverage index of indoor distribution system, such as the cover quality,the FTP transmitt rate of uplink and downlink of LTE, the service connect indoor signalsuccess rate and so all which verifies the feasibility of the scheme.