| With the upgrading of technology,5G technology has gradually been put into commercial use,but 4G LTE technology is still the most widely used.Therefore,the dedicated small LTE base station designed and researched in this paper has great research and application in many real-world scenarios space.However,this article focuses on multi-user uplink video transmission technology.At present,there is an increasing demand for real-time communication.Therefore,dedicated small LTE base stations have gradually become an important area for studying the LTE protocol stack.It will be introduced to try to optimize the uplink video transmission performance of the dedicated small LTE base station from three directions in this thesis: the optimization algorithm,the optimization of the system parameter configuration,and the video precoding at the transmitting end.In the final test section,the test results in real scenarios are given and a concise analysis is provided.Firstly,it is analyzed the core MAC sublayer of the entire study in this thesis,detailedly analyzed its structure and main functions,and analyzed the HARQ mechanism and the SPS mechanism,that is,the retransmission and scheduling mechanism.This is the upstream video transmission The core mechanism is also the basis of subsequent optimization algorithms.After that,the related content of QoS is briefly introduced,and several common QoS algorithms are listed,which can be used as a reference for the optimization algorithms in the following chapters.Then,the detailed process of uplink data transmission is analyzed in detail.Based on this,an optimization algorithm based on the dynamic characteristics of the channel is researched.This is by optimizing the MCS number selection of the UE and optimizing the time-frequency The algorithm model optimized simultaneously from two angles of resource allocation,and corresponding optimization is also proposed from the coding mode of the transmitting end,and its specific performance is tested in Chapter 5.In the next chapter,several core modules of the uplink of the dedicated small LTE base station are designed and implemented,and they are given in the form of a flowchart.At the same time,the specific work flow and the functions to be implemented are explained.Resource management and scheduling strategies for dedicated small LTE base stations.In this way,readers can clearly understand the entire uplink workflow,and at the same time can better understand how the uplink video data stream is transmitted at the MAC layer.Then the uplink video transmission test is performed for different quality video streams through different network transmission protocols,and the uplink video in a multi-user scenario will be tested by changing the number of UE clients connected to the base station.Transmission performance,finally,after optimization and debugging,the dedicated small LTE base station studied in this paper can reliably complete 8 channels of 720 P real-time video under the conditions of 40 M bandwidth,the uplink and downlink subframe ratio mode is 0,and the QCI service level is set to 7.For streaming data transmission tasks,the average initial video buffer value is 5 seconds,and the packet loss rate is less than 5%.The specific test results will be analyzed and explained in detail in Chapter 5.Finally,it summarizes the full text and puts forward the shortcomings of the current base station performance,and plans for the subsequent research. |
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