Microsoft PowerPoint - CMW500 LTEÉäƵ²âÊÔ¼ò½é.ppt
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1 CMW500 LTE 射频测试简介 罗德与施瓦茨产品支持部
2 学习内容 通过本次学习, 我们将了解到 LTE 物理层的结构是怎样的 LTE 功率分布有什么特点 TS 定义了哪一些测试 Jun 2011 LTE Test 马志聪, RS_SZ 2
3 LTE 物理层 T slot 物理层资源示意图 DL N symb DL symb N N RB sc N subcarriers RB sc DL RB N RB N sc subcarriers ( k, l) DL l = 0 l = N symb 1 Jun 2011 LTE Test 马志聪, RS_SZ 3
4 LTE 物理层 LTE 时频资源 RE(Reosurce Element), LTE 最小的资源 REG(RE Group), 将 4 个 RE 组合在一起, 作为更大的粒度 RB(Resource Block), 12subcarrier*1slot, 是 LTE 基本调度单元 RB Pair, 在一个 TTI 中两个时间上连续的, 频率相同的 RB Jun 2011 LTE Test 马志聪, RS_SZ 4
5 LTE 物理层 LTE 物理层帧结构 (FDD) T CP 5.1/4.7 us T SYMBOL 66.7µs 1/T SYMBOL =15kHz CP f 0 f 1 f 2 OFDM Symbol OFDM Symbol OFDM Symbol OFDM Symbol OFDM Symbol CP CP CP CP CP CP T CP 16.7 us subframe = 2 slot, 1slot = 0.5ms f 0 f 1 f 2 OFDM Symbol slot slot f Normal CP Extended CP 1 subframe = 1ms (= min TTI) #0 #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14 #15 #16 #17 #18 #19 1 radio frame = 10 subframes = 10 TTIs = 10 ms Jun 2011 LTE Test 马志聪, RS_SZ 5
6 LTE 物理层 物理层帧结构 Type 1(FDD) 1 frame = 10 ms 1 frame = 10 subframe 1 subframe = 2 slot(0.5ms) Maximum FFT size (20 Bandwidth) = 2048(110x12=1320 subcarrier used) Subcarrier spacing = 15 khz Subcarrier Bandwidth 2048x15kHz = Jun 2011 LTE Test 马志聪, RS_SZ 6
7 LTE 物理层 物理层帧结构 Type 2(TDD) One radio frame = 10 ms = 2 half-frames Subframes 0 and 5 always for DL Special subframe with various partitioning of the following 3 fields DwPTS DL GP Guard period UpPTS UL, always followed by an UL subframe Diagram illustrates 5 ms DL to UL switching point periodicity One special subframe per half-frame 10 ms switching point periodicity also supported One special subframe per radio frame Supports 7 different UL/DL configurations Different numbers of UL / DL subframes partitioning Jun 2011 LTE Test 马志聪, RS_SZ 7
8 LTE 物理层 TYPE2 UL/DL 配置 这个时间间隔表示两个相邻特殊子帧的时间间隔 Jun 2011 LTE Test 马志聪, RS_SZ 8
9 LTE 下行信道映射 (FDD) PDSCH PDCCH PCFICH PBCH S-SCH P-SCH Time Frequency Jun 2011 LTE Test 马志聪, RS_SZ 9
10 LTE Downlink OFDMA time-frequency multiplexing QPSK, 16QAM or 64QAM modulation frequency 1 resource block = 180 khz = 12 subcarriers UE4 UE5 UE3 UE2 Subcarrier spacing = 15 khz UE1 UE6 time *TTI = transmission time interval ** For normal cyclic prefix duration 1 slot = 0.5 ms = 7 OFDM symbols** 1 subframe = 1 ms= 1 TTI*= 1 resource block pair Jun 2011 LTE Test 马志聪, RS_SZ 10
11 LTE 中的 DFTS-OFDM 技术 DFTS-OFDM Reminder: For FFT, M must be multiple of 2 x 根据 PDCCH 的指示映射到相应的频带, 其余位置补零 Unused subcarriers Jun 2011 LTE Test 马志聪, RS_SZ 11
12 LTE 上行信道映射 (FDD) Unscheduled Resource Blocks Scheduled Resource Blocks Demodulation Reference Signal PUSCH Sounding Reference Signal Scheduled PUCCH Demodulation Reference Signal PUCCH Total available bandwidth time 1 subframe Allocated bandwidth frequency Jun 2011 LTE Test 马志聪, RS_SZ 12
13 LTE uplink SC-FDMA time-frequency multiplexing 1 resource block = 180 khz = 12 subcarriers Subcarrier spacing = 15 khz frequency 1 slot = 0.5 ms = 7 SC-FDMA symbols** UE1 UE2 UE3 1 subframe = 1 ms= 1 TTI* UE4 UE5 UE6 *TTI = transmission time interval ** For normal cyclic prefix duration time QPSK, 16QAM or 64QAM modulation Jun 2011 LTE Test 马志聪, RS_SZ 13
14 上行功率控制 LTE 与 WCDMA 上行功控对比 WCDMA 上行干扰主要来自于小区内不同 UE 之间的干扰 LTE 的上行功控管理的要求与 WCDMA 有很大的不同,LTE 小区内每个 UE 分配的时频资源是不一样的, 因此小区内干扰的管理不像 WCDMA 那样关键 WCDMA 以一个 slot(0.67ms) 为环延时,LTE 是以 5 个 TTI(5ms) 为环延时 WCDMA 是以 ±1 db 为步进,0.67ms 为周期的调整,LTE 可以以更大的步进, 而且是非固定周期的调整,LTE 的功控频率一般不会超过几百赫兹 Jun 2011 LTE Test 马志聪, RS_SZ 14
15 上行功率控制 功控分类 开环功控 闭环功控 对于 LTE 来说, 采用的是一种基本开环工作点 + 动态偏移的方式 Jun 2011 LTE Test 马志聪, RS_SZ 15
16 LTE 终端的测试标准 RAN5 TS Title Common test environments for UE conformance testing UE conformance specification Radio transmission and reception (RF) UE conformance specification (Sig) Completion level at RAN#44 Date for Approval Functional freezing date 90% Dec. 08 Sep.09 80% Dec. 08 Sep.09 70% Dec. 08* Sep.09 Jun 2011 LTE Test 马志聪, RS_SZ 16
17 LTE 射频测试要求 根据 TS , 节要求, 默认的射频测试带宽为 : 最小支持带宽,5 带宽, 和最大支持带宽 如果 UE 不支持 5 带宽, 则只测最大最小带宽 具体的测试项, 会根据本测试项定义具体的测试配置 Jun 2011 LTE Test 马志聪, RS_SZ 17
18 LTE 信道分配 Table Transmission bandwidth configuration N RB in E-UTRA channel bandwidths Channel bandwidth BW Channel [] Transmission bandwidth configuration N RB Jun 2011 LTE Test 马志聪, RS_SZ 18
19 LTE 信道分配 Figure Definition of Channel Bandwidth and Transmission Bandwidth Configuration for one E-UTRA carrier Channel Bandwidth [] Transmission Bandwidth Configuration [RB] Transmission Bandwidth [RB] Channel edge Resource block Channel edge Active Resource Blocks Center subcarrier (corresponds to DC in baseband) is not transmitted In downlink 对于某个 UE 来说, 总是分配到其带宽配置的一部分作为其实际传输带宽, 这个是由基站在每个 TTI 分配的 Jun 2011 LTE Test 马志聪, RS_SZ 19
20 LTE 各频带支持的带宽 Table : E-UTRA channel bandwidth E-UTRA band / channel bandwidth E-UTRA Band Yes Yes Yes Yes 2 Yes Yes Yes Yes Yes [1] Yes [1] 3 Yes Yes Yes Yes Yes [1] Yes [1] 4 Yes Yes Yes Yes Yes Yes 5 Yes Yes Yes Yes [1] 6 Yes Yes [1] 7 Yes Yes Yes Yes [1] 8 Yes Yes Yes Yes [1] 9 Yes Yes Yes [1] Yes [1] Jun 2011 LTE Test 马志聪, RS_SZ 20
21 LTE-FDD 测试频率举例 Table : Test frequencies for E-UTRA channel bandwidth for operating band 1 Test Frequency ID Bandwidth [] N UL Frequency of Uplink [] N DL Frequency of Downlink [] Low Range Mid Range 5/10/15/ High Range Jun 2011 LTE Test 马志聪, RS_SZ 21
22 LTE-TDD 测试频率举例 Table : Test frequencies for E-UTRA channel bandwidth for operating band 33 Test Frequency ID Bandwidth [] EARFCN Frequency (UL and DL) [] Low Range Mid Range 5/10/15/ High Range Jun 2011 LTE Test 马志聪, RS_SZ 22
23 UE Maximum Output Power 最大功率测试 对于 CLASS 3 级别的 UE, 最大功率为 23dBm ±2.7dB 在特殊的 RB 分配条件下 ( 落在带宽上下边缘 4 的区间 ), 最大功率下限可以再往下降低 1.5dB,Tolerance = +2.7 / -4.2 db Jun 2011 LTE Test 马志聪, RS_SZ 23
24 UE Maximum Output Power Jun 2011 LTE Test 马志聪, RS_SZ 24
25 UE Maximum Output Power Jun 2011 LTE Test 马志聪, RS_SZ 25
26 Tx power aspects RB power = Ressource Block Power, power of 1 RB TX power = integrated power of all assigned RBs Jun 2011 LTE Test 马志聪, RS_SZ 26
27 Maximum Power Reduction (MPR) 缩减最大功率测试 其目的是为了降低终端在高阶调制或者在分配大数目 RB 情况下, 对放大器的要求 如果用的是 QPSK 调制, 分配大数目 RB,MPR 降低 1db 如果用 16QAM 调制,MPR 降低 1db 如果同时使用 16QAM 调制和分配大数目的 RB,MPR 降低 2db Jun 2011 LTE Test 马志聪, RS_SZ 27
28 Maximum Power Reduction (MPR) Table : Maximum Power Reduction (MPR) for Power Class 3 Modulation QPSK 16 QAM 16 QAM Channel bandwidth / Transmission bandwidth configuration [RB] 1.4 > 5 5 > > 4 4 > 4 5 > 8 8 > 8 10 > > > > > > 18 MPR (db) Jun 2011 LTE Test 马志聪, RS_SZ 28
29 Maximum Power Reduction (MPR) Jun 2011 LTE Test 马志聪, RS_SZ 29
30 Configured UE transmitted Output Power LTE 可以由基站通过广播消息向 UE 发送功率配置信息, 当 UE 收到这个广播消息后会调整自身的上行功率, 满足基站配置的要求 Jun 2011 LTE Test 马志聪, RS_SZ 30
31 Configured UE transmitted Output Power Jun 2011 LTE Test 马志聪, RS_SZ 31
32 Configured UE transmitted Output Power Measured UE output power test point 1 Measured UE output power test point 2 Measured UE output power test point Channel bandwidth / maximum output power dbm ± dbm ± dbm ± Note: In addition note 2 in Table shall apply to the tolerances. Jun 2011 LTE Test 马志聪, RS_SZ 32
33 General ON/OFF Time Mask 开关时间模板测试时域的功率开关特性 Start Sub-frame End sub-frame Start of ON power End of ON power End of OFF power Start of OFF power requirement requirement * The OFF power requirements does not apply for DTX and measurement gaps 20µs 20µs Transient period Transient period Figure : General ON/OFF time mask Jun 2011 LTE Test 马志聪, RS_SZ 33
34 General ON/OFF Time Mask 开关时间模板指标要求 Channel bandwidth / minimum output power / measurement bandwidth Transmit OFF power dbm Transmission OFF Measurement bandwidth Expected Transmission ON Measured power ± ± ± ± ± ± 7.5 Jun 2011 LTE Test 马志聪, RS_SZ 34
35 General ON/OFF Time Mask Jun 2011 LTE Test 马志聪, RS_SZ 35
36 PRACH Time Mask PRACH 时间模板用于验证 UE 发送的 Preamble 功率是否满足规范的要求, 以及其功率开关特性 Figure : PRACH ON/OFF time mask PRACH ON power requirement End of OFF power requirement Start of OFF power requirement 20µs 20µs Transient period Transient period Jun 2011 LTE Test 马志聪, RS_SZ 36
37 PRACH Time Mask 开关时间模板测试时域的功率开关特性 Table : PRACH ON power measurement period Channel bandwidth / Output Power [dbm] / measurement bandwidth Transmit OFF power dbm Transmission OFF Measurement bandwidth Expected PRACH Transmission ON Measured power -1± ± ± ± ± ± 7.5 PRACH preamble format Measurement period (ms) Table : PRACH time mask Jun 2011 LTE Test 马志聪, RS_SZ 37
38 PRACH Time Mask Jun 2011 LTE Test 马志聪, RS_SZ 38
39 SRS Time Mask 测量 SRS 参考信号的时间模板 Table : SRS time mask Transmit OFF power Transmission OFF Measurement bandwidth Expected SRS Transmission ON Measured power Channel bandwidth / Output Power [dbm] / measurement bandwidth ± ± ± dbm ± ± ± 7.5 Jun 2011 LTE Test 马志聪, RS_SZ 39
40 SRS Time Mask Jun 2011 LTE Test 马志聪, RS_SZ 40
41 SRS Time Mask Jun 2011 LTE Test 马志聪, RS_SZ 41
42 Frequency Error 频率误测测试主要关注 OFDM 符号的频率误差 Jun 2011 LTE Test 马志聪, RS_SZ 42
43 Error Vector Magnitude (EVM) LTE 对 EVM 的测试要求 Parameter Unit Average EVM Level Reference Signal EVM Level QPSK or BPSK % 17.5 [17.5] 16QAM % 12.5 [12.5] Parameter Unit Level UE Output Power dbm -40 Operating conditions Normal conditions Jun 2011 LTE Test 马志聪, RS_SZ 43
44 Error Vector Magnitude (EVM) EVM 的测试的设置 Jun 2011 LTE Test 马志聪, RS_SZ 44
45 Error Vector Magnitude (EVM) Jun 2011 LTE Test 马志聪, RS_SZ 45
46 Carrier leakage 载波泄露要测的是子载波的调制符号的原点漂移情况 如果 DC 子载波被分配使用的话,DC offset 还会对原点漂移带来影响 Jun 2011 LTE Test 马志聪, RS_SZ 46
47 Carrier leakage 相对载波泄露功率 ( 原点漂移功率 ) 是加性正弦信号功率和调制信号功率的比值 Table : Minimum requirements for Relative Carrier Leakage Power LO Leakage Parameters Output power >0 dbm -30 dbm Output power 0 dbm -40 dbm Output power < -30 dbm Relative Limit (dbc) Jun 2011 LTE Test 马志聪, RS_SZ 47
48 Carrier leakage 载波泄露的测试的设置 Jun 2011 LTE Test 马志聪, RS_SZ 48
49 Carrier leakage Jun 2011 LTE Test 马志聪, RS_SZ 49
50 In-band emissions for non allocated RB 这个测试项要测的是 UE 上行发射功率, 除了自身分配的 RB 之外, 对带内其他 RB 的影响 Jun 2011 LTE Test 马志聪, RS_SZ 50
51 In-band emissions for non allocated RB 带内发射对非分配 RB 影响试的设置 Jun 2011 LTE Test 马志聪, RS_SZ 51
52 In-band emissions for non allocated RB Jun 2011 LTE Test 马志聪, RS_SZ 52
53 Inband emissions 3 types of inband emissions: general, DC and IQ image Used allocation < ½ channel bandwidth channel bandwidth Jun 2011 LTE Test 马志聪, RS_SZ 53
54 Inband emmission error cases DC carrier leakage due to IQ offset Jun 2011 LTE Test 马志聪, RS_SZ 54
55 Inband emmission error cases Inband image due to IQ inbalance Jun 2011 LTE Test 马志聪, RS_SZ 55
56 EVM equalizer spectrum flatness EVM 均衡器频域平坦度测试, 用于测量在进行 EVM 测试中, 均衡器系数的变化,EVM 均衡器是对接收信号进行补偿, 观察 EVM 均衡器的平坦度, 可以从一个侧面反应信号在频域上的功率平坦状况 Jun 2011 LTE Test 马志聪, RS_SZ 56
57 EVM equalizer spectrum flatness Jun 2011 LTE Test 马志聪, RS_SZ 57
58 Occupied bandwidth OBW 测试的是占信号功率 99% 的频率范围 OBW 的测量结果应比传输带宽要小, 也就是说信号功率的 99% 分量都应该落在传输带宽之内 Spurious domain f OOB Channel bandwidth f OOB Spurious domain RB E-UTRA Band Jun 2011 LTE Test 马志聪, RS_SZ 58
59 Occupied bandwidth OBW 的测试要求 Occupied channel bandwidth / channel bandwidth Channel bandwidth [] Jun 2011 LTE Test 马志聪, RS_SZ 59
60 Occupied bandwidth Jun 2011 LTE Test 马志聪, RS_SZ 60
61 Spectrum Emission Mask 频谱发射模板测量由调制或者非线性传输导致的带外辐射功率 Jun 2011 LTE Test 马志聪, RS_SZ 61
62 Spectrum Emission Mask 频谱发射模板测试要求 Δf OOB () ± 0-1 ± ± ± ± 5-6 ± 6-10 ± ± ± Spectrum emission limit (dbm)/ Channel bandwidth Measurement bandwidth 30 khz Jun 2011 LTE Test 马志聪, RS_SZ 62
63 Spectrum Emission Mask Jun 2011 LTE Test 马志聪, RS_SZ 63
64 Additional Spectrum Emission Mask 额外频谱发射模板用以测量在特定的条件下, 对 UE 的辐射功率不能超过指定的功率水平, 这个测试对比频谱发射模板带有额外的要求 这个额外的要求通过参数 NS_0X 来指定, 有 NS_03,NS_04, NS_06,NS_07 等, 这个参数由小区通过广播消息 (SIB2) 通告 UE Jun 2011 LTE Test 马志聪, RS_SZ 64
65 Additional Spectrum Emission Mask Table : Additional requirements (network signalled value "NS_03") Spectrum emission limit (dbm)/ Channel bandwidth Δf OOB () MH z 20 Measurement bandwidth ± khz ± ± ± ± ± ± ± ± Jun 2011 LTE Test 马志聪, RS_SZ 65
66 Additional Spectrum Emission Mask Jun 2011 LTE Test 马志聪, RS_SZ 66
67 Adjacent Channel Leakage power Ratio ACLR 测试测量 UE 传输信道发射功率对临信道的影响 LTE 的 ACLR 测试测量相邻的 E-UTRA(LTE) 与 2 个 UTRA(WCDMA) 信道 UTRA Channel Transmitting Channel EUTRA Channel f OOB E-UTRA channel E-UTRA ACLR1 UTRA ACLR2 UTRA ACLR1 RB Jun 2011 LTE Test 马志聪, RS_SZ 67
68 Adjacent Channel Leakage power Ratio ACLR 测试要求 Table : General requirements for E-UTRAACLR E-UTRA ACLR1 Channel bandwidth / E-UTRA ACLR db db 5 30 db / measurement bandwidth db db db E-UTRA channel Measurement bandwidth Jun 2011 LTE Test 马志聪, RS_SZ 68
69 Adjacent Channel Leakage power Ratio ACLR 测试要求 Table : General requirements for UTRAACLR1/2 Channel bandwidth / UTRA ACLR1/2 / measurement bandwidth UTRA ACLR1 33 db 33 db 33 db 33 db 33 db 33 db Adjacent channel centre frequency offset (in ) 0.7+BW UTRA /2 / -0.7-BW UTRA /2 1.5+BW UTRA /2 / -1.5-BW UTRA /2 2.5+BW UTRA /2 / -2.5-BW UTRA /2 5+BW UTRA /2 / -5-BW UTRA /2 7.5+BW UTRA /2 / -7.5-BW UTRA /2 10+BW UTRA /2 / -10-BW UTRA /2 UTRA ACLR db 36 db 36 db 36 db Adjacent channel centre frequency offset (in ) *BW UTRA /2 / *BW UTRA /2 5+3*BW UTRA /2 / -5-3*BW UTRA / *BW UTRA /2 / *BW UTRA /2 10+3*BW UTRA /2 / -10-3*BW UTRA /2 E-UTRA channel Measurement bandwidth UTRA 5 channel Measurement bandwidth UTRA 1.6 channel measurement bandwidth NOTE 1: Applicable for E-UTRA FDD co-existence with UTRA FDD in paired spectrum. NOTE 2: Applicable for E-UTRA TDD co-existence with UTRA TDD in unpaired spectrum. Jun 2011 LTE Test 马志聪, RS_SZ 69
70 Adjacent Channel Leakage power Ratio Jun 2011 LTE Test 马志聪, RS_SZ 70
71 Reference sensitivity level 灵敏度测试用以测量 UE 的接收性能, 在灵敏度功率设置下, 测试 UE 的吞吐量应达到参考测量信道最大吞吐量的 95% 测试的发送功率设置参考 Tables , Table Jun 2011 LTE Test 马志聪, RS_SZ 71
72 Reference sensitivity level Jun 2011 LTE Test 马志聪, RS_SZ 72
73 Maximum input level 最大输入测试, 要测量在较大的下行功率发射情况下,UE 接收机的性能 UE 的吞吐量要大于参考测量信道 (RMC) 最大吞吐量的 95% Jun 2011 LTE Test 马志聪, RS_SZ 73
74 Maximum input level 最大输入水平测试要求 Rx Parameter Units Channel bandwidth Power in Transmission Bandwidth Configuration dbm NOTE 1: The transmitter shall be set to 4dB below P CMAX_L with P CMAX_L as defined in clause NOTE 2: Reference measurement channel is Annex A QAM R=3/4variant with one sided dynamic OCNG Pattern OP.1 FDD/TDD as described in Annex A.5.1.1/A Jun 2011 LTE Test 马志聪, RS_SZ 74
75 Maximum input level Jun 2011 LTE Test 马志聪, RS_SZ 75
76 END Q&A Jun 2011 LTE Test 马志聪, RS_SZ 76
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