Analysis: Td
HSDPA planning software to support HSDPA in addition to the algorithm, we also need to consider different strategies HSDPA networking issues, both of which are key to software development planning.
To meet the 3G requirements of large data transfers, 3GPP introduced in the R5 HSDPA. HSDPA is a high-speed downlink packet access technology package, by using adaptive modulation and coding AMC, HARQ hybrid automatic repeat request technique, the introduction of higher order modulation (16QAM), the base station side of the addition of a MAC-hs entity for data fast scheduling, users get a higher peak than the R4 cell data rate and throughput, in order to complete the corresponding control, scheduling and feedback, HSDPA physical layer introduced in the HS-SCCH and HS-SICH physical control of both upstream and downstream channel, rapid completion of information between the UE and the NodeB interaction. The application of these technologies greatly improve the user downlink data rate transmission rates and throughput, single-carrier of the theoretical peak speed up to 2.8Mbps, further enhanced equipment utilization, enhanced spectral efficiency. HSDPA will also provide for the greater number of high-speed service, shorter service response times and shorter transmission delay.
Network regulation approach Xiangjie Network coverage and capacity planning are from two aspects. HSDPA network planning and TD-SCDMAR4 flow on the network as a whole: from the cover, through link budget calculation cell coverage radius, covering the area required by the need to deploy an initial estimate of cell number CellCountcover-age; from the capacity of the , according to traffic model estimates the number of carriers needed, then Node-B according to the capacity limit and stop type of cell needed to estimate the number of Cellcountcapacity. More CellCountcoverage and Cellcountcapacity, select the greatest demand for the final estimates of cell number, and then estimate the number of required base stations. In accordance with the estimated number of base stations, base station according to operators of the Site Selection list of candidates and principles, and selected to meet the requirements of the base station, and then enter these base stations to the network planning tool for further calculations.
Network planning tools can also provide coverage and capacity calculations, more accurate estimates than the former. The former estimate is the number of base stations in order to provide a reference value. Network planning tool is based on the coverage prediction model calibrated combination of the spread of digital map operation, the output results PCCPCHRSCP, PCCPCHC / I, HS-PDSCHEc/Nt, CQI and the RLC layer of the maximum and average user throughput, etc.; capacity calculation is random process based on MonteCarlo services according to the set, then the model parameters (number of users, traffic type, terminal type, mobile type, environment, etc.) Call The simulation results include the total statistical values, assigned to the Cell Site and business slot carrying the business and operations of each terminal and connections. Use planning tools to plan, you first need to complete based on control channel coverage prediction coverage of each cell adjusted by means of main antenna height, azimuth and inclination angle and power. TD TPLAN software has an optimization module Capesso, to define the conditions according to the rapid completion of these adjustments for the large-scale network planning, significant savings in time and increase efficiency. In the coverage adjustment is completed, if service can be simulated. Call in coverage prediction and simulation results on the number of base stations may need to be adjusted to meet the requirements of network performance, so the final number of base stations, network construction is a planning tool output prevail. What is the difference between
and implementation
Cover forecasting and network planning includes two aspects of telephone traffic simulation. Coverage prediction is based on the propagation model, digital maps, base station height, antenna characteristics, feeder cell and calculate the characteristics of wireless network coverage, traffic simulation model based on telephone traffic, user density, terminal types, operating environment combined with coverage prediction MonteCarlo simulation, further from the capacity point of view the number of base stations and the carrier is configured to meet the design requirements.
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