| With the advent of 5G era,people have higher and higher requirements for mobile network.High speed,low delay,wide coverage and low power consumption have become the label of 5G network.At present,the mainstream frequency band used by 5G network is higher than that of 4G network.Although higher frequency band can provide greater bandwidth to meet more users and services in 5G network,the characteristics of easy attenuation and weak penetration in medium and high frequency band make it difficult for the coverage of base station signals to meet the requirements of wide coverage.Simply increasing the number of base stations greatly increases the network construction cost of operators.In order to realize the wide coverage of 5G network,we think we can use the medium and high frequency band as the main frequency band of 5G and the low frequency band as a supplement,that is,build 5G network in the form of high and low frequency hybrid network.Therefore,this paper designs a complete hybrid networking simulation system,and verifies the performance of the hybrid networking system.The innovations of this paper mainly include the following three aspects,the selection of hybrid networking frequency and the design of base station topology,the construction of hybrid networking simulation platform,and the design and performance analysis of user access algorithm.The research work is also carried out from the above three aspects.First of all,this paper analyzes the characteristics of the 700MHz frequency band and the 2.6GHz frequency band and the development situation in my country.It is believed that the advantages and disadvantages of the two frequency points are complementary.The two frequency points can be combined for hybrid networking,and the design is based on the coverage characteristics of the two frequency points.Three sets of base station topology structures are presented;secondly,this paper designs a set of reasonable hybrid networking simulation process based on the characteristics of hybrid networking,and builds a hybrid networking simulation platform based on the 5G system-level simulation platform,which provides information for the research topic of this paper.Finally,this paper designs three user access algorithms,so that users can choose to connect to a 700MHz network or a 2.6GHz network according to the user access algorithm.At the same time,a single frequency point comparison simulation and data statistics methods are designed to analyze the simulation.Important performance metrics in the results.This paper conducts multiple simulations by selecting different user access algorithms and base station topology,and compares the simulation results of the hybrid networking system and the single-frequency system.From the simulation results,according to the different user access algorithms,in some simulation results,the performance of the 2.6GHz network is slightly improved compared to the single frequency point,while the performance of the 700MHz network is slightly reduced within the acceptable range.On the contrary.For example,when the 1:4 co-site topology is selected,the access algorithm is based on the RSRP threshold,and the RSRP threshold is set to-42dBm,the average throughput of 2.6GHz network users is increased by 7.6%compared with the single-frequency 2.6GHz network.,the average throughput of 700MHz network users is 19.9%lower than that of single-frequency 700MHz network,which is suitable for scenarios that give priority to the performance of 2.6GHz network users;And when the RSRP offset value is set to 16.43dBm,although the average throughput of 2.6GHz network users is reduced by 5.3%,the average throughput of 700MHz network users is increased by 80.5%.The performance of 700MHz network has improved significantly,which is suitable for giving priority to 700MHz user network.performance scenarios.In short,the simulation results are in line with expectations,which verifies the feasibility of hybrid networking and has certain reference value for the existing network. |
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