The throughput originally refers to the output (or service) provided by a business system in a unit time.staycomputerOr data communication system, which refers to the average rate of successful data delivery through a communication channel or a node in a unit time, usually in bits per second (bps).
Throughput is a function of computer or data communication system (such as network bridgeRouter、gatewayorWANConnection, etc.)Data transmission rateMeasure of.Throughput is usually an overall evaluation of the ability of a system and its components to handle data transmission requests.For example, the throughput of a server depends on its processor type, network interface card type, and data transmissionBusSizediskSpeed, the volume of memory buffer, and the effectiveness of software management of these components.In communication systems, this measure is usually based on the number of data bits or packets that can be processed per second, and it depends on thebandwidthAnd exchange parts (e.gRouterorHub）Speed of.Two endpoints on the networkEquipment roomThe throughput of depends on the computerNetwork interface cardAnd the network that connects them[1]。
Throughput atperformance testing Middle refers to the amount of data transmitted on the network per unit time.It is the main indicator of network performance[1]。
analogical explanations
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Scenario analogy: I saw this report a while ago: Lianyungang Port in 2009Cargo throughputExceeding 113 million tons;The cargo throughput of Shanghai Port was 544 million tons, down 1.0% year on year.I think this throughput is somewhat similar to that of our wireless data service, except that the port handles tangible goods and the wireless data service handles intangible data.The throughput per unit time is the throughput;However, the unit of port throughput is 100 million tons per year, and the unit of wireless communication field throughput is kbit/s.
A survey of an online user once asked, "How fast can you get online, and you will be satisfied?" He said, "The faster the better, the faster the better." In general, the impact of throughput on user perception has a lot to do with user expectations.For example, after clicking the download button, he was busy with other things. After a long time, he found that the download had been completed. He felt very good;If he has nothing to do, it may be a long time for him to wait for a few minutes.
The throughput is divided into uplink and downlink.Generally speaking, people's demand for downloading files is far greater than that for uploading files.Therefore, the downlink throughput is generally required to be greater than the uplink throughput.
Another problem: when sending a "Hello World" message, the data volume of the air interface may increase several times after the process of source coding, channel coding, spread spectrum, scrambling, etc. Then what layer is the throughput?Is it the rate of the application layer, the rate of the wireless link layer (RLC), or the rate of the physical layer?In general, when referring to the throughput indicator, you need to specify which layer it is.The rate of data service in the application layer is relatively low, the rate in the wireless link layer is higher, and the rate in the physical layer is higher.The PS64k, PS128k, etc. we usually refer to the rate of the RLC layer[2]。
4G throughput optimization
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With the issuance of LTE network license, major operators are building long-awaited 4G networks in full swing. How to make better use of new technologies is a problem we need to consider in our optimization work,The peak rate of LTE network design is 100Mbps for downlink and 50Mbps for uplink. How to truly reflect the actual rate of LTE network, reflect network problems, and how to optimize LTE throughput is particularly important. Therefore, it is necessary to clarify the purpose, analyze relevant data, locate network problems, and provide optimization ideas and methods for similar problems in the future[3]。
As shown in the figure "4G Throughput Optimization Process":
