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1、将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。5G mobile communication technology-Analyze 5G time-frequency resources将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。Analyze 5G time-frequency resourcesWe know that 5G use
2、s a different frequency band than 2/3/4g,so let us look at the frequency range of 2G,3G,4G and 5G.将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。2G的频段:800MHz-900MHz,1700MHz-1850MHz3G的频段:1880MHz-1900MHz和2010MHz-2025MHz。4G的频段是:1880-1900MHz、2320-2370MHz、2575-263
3、5MHz。5G的频段:3300-3400MHz(原则上限室内使用)、3400-3600MHz和4800-5000MHz将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。Lets look at this formula.C is the speed of light,which is a fixed value.Does anyone know the speed of light?The theoretical value of the speed of light
4、is 300000 kilometers per second.入 is the wavelength and V is the frequency.As can be seen from the figure,The speed of light is equal to the wavelength times the frequency.将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。For mobile communication,is high frequen
5、cy better or low frequency better?What are the problems caused by too high or too low spectrum?将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。For mobile communication,is high frequency better or low frequency better?According to the formula,since the speed of
6、 light is fixed,the higher the frequency,the shorter the wavelength,the lower the frequency,and the longer the wavelength.So to solve this problem,we only need to consider the influence of wavelength on communication.The longer the wavelength,the wider the radiation range of the wave,and it is not e
7、asy to be disturbed.The shorter the wavelength,the smaller the radiation range of the wave and vulnerable to interference.Therefore,the longer the wavelength,the lower the frequency,and the better the communication effect.将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提
8、高了学生的写作水平。What are the problems caused by too high or too low spectrum?将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。In terms of transmission distance and signal transmission,the lower the frequency,the larger the wavelength,which are prone to diffraction an
9、d interference.In nature,the vibration of objects is mostly low-frequency,which is relatively easy to generate interferenceFrom the perspective of application:the frequency range of low-frequency signals is relatively small,and there are not so many frequency bands for people to use.将咖啡屋学习模式应用于小学生的作
10、文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。Watch the video and think about the following three questions:What is millimeter wave?What are the advantages of millimeter wave?Why did 5G start using millimeter wave?将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的
11、了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。5G frequency resources:The 5G spectrum range consists of two parts,sub6g and millimeter wave.Sub6g refers to the frequency band below 6GHZ,Millimeter wave refers to the frequency band above 6GHZ,Mainly at 28/39/60/73GHZ.Sub6g is also called FR1,millimeter wave is also cal
12、led FR2.In Sub6g,the part below 3GHZ is called sub3g,and the part between 3GHZ and 6GHZ is called C-band.将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。It can be seen that due to the introduction of millimeter wave,5G can use a lot of frequency bands.So what
13、bandwidth options are available for 5G?将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。5G frequency resources:5G大带宽典型特征有哪些?What are the typical characteristics of 5G large bandwidth?M:Megahertz将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培
14、养了良好的写作习惯,提高了学生的写作水平。5G frequency resources:M:MegahertzWhat are the typical characteristics of 5G large bandwidth:1.The bandwidth of sub 6G canreach 100m,and the maximum bandwidth in millimeter wave can reach 400m2.Bandwidths below 5m are canceled3.The bandwidth below 20m are mainly to meet the need
15、s of existing spectrum evolution(5G obviously has a lot of spectrum resources,but it still retains a bandwidth which below 20m)将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。5G time domain resources:010203NR无线帧结构 NR wireless frame structure参数集(Parameter set)N
16、umerology主流帧结构 Mainstream frame structure将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。Related concepts空口时域的通用结构,在不同的制式下,满足数据传输及控制的需求Time domain resources:concepts of frame,subframe,time slot and symbolThe general structure of air interface time domain can m
17、eet the needs of data transmission and control under different systemsLTE:One frame contains ten subframesEach subframe includes 2 time slotsEach time slot contains 7 symbolsBut in 5G,Things have changed(情况变得不同了)Is not fixed(是不固定的)将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了
18、良好的写作习惯,提高了学生的写作水平。wireless frame structure of LTEThe duration of each wireless frame is 10ms,including 10 subframes,each subframe is 1ms,each subframe includes 2 time slots,and the duration of each time slot is 0.5ms.时隙(0.5ms)无线帧 Tf=307200 x Ts=10ms子帧(1ms)012345678910111213141516171819Ts=1/(15000 x
19、2048)=32.552083nsTslot=15360 x TsFDDFDD-LTE frame structure LTE frame structure:将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。TDDTDD-LTELTE frame structure frame structure:无线帧=10ms下行特殊子帧上行上行下行下行上行上行下行下行导频时隙(DwPTS)保护周期(GP)上行导频时隙(UpPTS)wireless frame structure
20、 of LTE A wireless frame is divided into two 5ms half frames with a frame length of 10ms.Each 10ms frame is composed of 10 1ms subframes,which are divided into uplink subframe,downlink subframe and special subframe.Whether it is a conventional subframe or a special subframe,the length is 1ms.The sub
21、frame contains two 0.5ms time slots.将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。无线帧=10ms下行特殊子帧上行上行下行下行上行上行下行下行导频时隙(DwPTS)保护周期(GP)上行导频时隙(UpPTS)Special subframeThe uplink pilot slot(uppts)is mainly used for uplink synchronization and random access。The downli
22、nk pilot slo(dwpts)t is mainly used for downlink synchronization and cell search。将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。思考问题:相对于相对于4G4G,3GPP3GPP定义的定义的5G NR5G NR的物理层帧结构最大的物理层帧结构最大的特点是什么呢?的特点是什么呢?Compared with 4G,what is the biggest feature of 5G NR phy
23、sical layer frame structure defined by 3GPP?将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。5G system frame structure5G5G帧结构由固定结构和帧结构由固定结构和灵活结构两部分组成灵活结构两部分组成:The frame structure The frame structure of 5G consists of of 5G consists of fixed structure and fixed
24、structure and flexible structure:flexible structure:将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。5G system frame structureThe same with LTE,the length of wireless frames and subframes is fixed,which allows better coexistence between LTE and 5G NR.Such a fix
25、ed structure is conducive to the synchronization of time slot and frame structure in the joint deployment mode of LTE and NR,and simplifies cell search and frequency measurementWhy is 5G frame structure composed of fixed structure and flexible structure?将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主
26、动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。5G time domain resources:010203NR无线帧结构 NR wireless frame structure参数集(Parameter set)Numerology主流帧结构 Mainstream frame structure将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。参数集Numerology NR supports several Subcarrier
27、 spacing,=(0-5)可以配置不同的子载波间隔。LTE only supports subcarrier of 15KHz,and subcarrier width and slot number of 5G can be flexibly configured to support various types of services.将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。参数集Numerologycalculation questionsWhen=
28、4,What is the length of each symbol?将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。Corresponding relationship of time-frequency resources under different SCS将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。子载波配置在哪种情况下,最适
29、合URLLC场景?小组讨论In which case is the subcarrier configuration most suitable for urllcscenarios?将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。载波间隔越大,越适合URLLC场景The larger the subcarrier width,the more suitable for urllc scenarios将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节
30、,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。Please fill in the blanks in the table将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。5G time domain resources:010203NR无线帧结构 NR wireless frame structure参数集(Parameter set)Numerology主流帧结构 Mainstream frame structure将咖啡屋学习模式应用于小学生的作文教学中,落实到作文教学的等各个环节,充分激发了学生写作的主动性和积极性,加强了学生间的了解与沟通,培养了良好的写作习惯,提高了学生的写作水平。Three main frame structures of NR若素素材若素素材谢谢