综测仪测试 NB-IoT-射频指标手册 - 图文

NB-IOT测试文档

禁止商业目的转载 2017.11 Parameter description General Unit Limit (NOTE 1) Applicable Frequencies Any non-allocated (NOTE 2) Image frequencies (NOTES 2, 3) Carrier frequency (NOTES 4, 5) max??15?10?log10(Ntone/LCtone),dB ?18?5?(?tone?1)/LCtone,?57dBm/(3.75kHzor15kHz)?Ptone?IQ Image dB -25 dBc -20 -10 -25 0 dBm ≤ Output power -30 dBm ≤ Output power ≤ 0 dBm -40 dBm ? Output power < -30 dBm Carrier leakage NOTE 1: An in-band emissions combined limit is evaluated in each non-allocated tone. For each such tone, the minimum requirement is calculated as the higher of Ptone - 30 dB and the power sum of all limit values (General, IQ Image or Carrier leakage) that apply. Ptone is defined in NOTE 10. NOTE 2: The measurement bandwidth is 1 tone and the limit is expressed as a ratio of measured power in one non-allocated tone to the measured average power per allocated tone, where the averaging is done across all allocated tones. NOTE 3: The applicable frequencies for this limit are those that are enclosed in the reflection of the allocated bandwidth, based on symmetry with respect to the centre carrier frequency, but excluding any allocated tones. NOTE 4: The measurement bandwidth is 1 tone and the limit is expressed as a ratio of measured power in one non-allocated tone to the measured total power in all allocated tones. NOTE 5: The applicable frequencies for this limit are those that are enclosed in the tones containing the DC frequency if Ntone is odd, or in the two tones immediately adjacent to the DC frequency if Ntone is even, but excluding any allocated tone. NOTE 6: NOTE 7: NOTE 8: LCtone is the Transmission Bandwidth (tones). Ntone is the Transmission Bandwidth Configuration (tones). ?tone is the starting frequency offset between the allocated tone and the measured non-allocated tone. (e.g. ?tone?1 or ?tone??1 for the first adjacent tone outside of the allocated bandwidth. NOTE 9: Ptone is the transmitted power per 3.75 kHz or 15 kHz in allocated tones, measured in dBm. 表3.1.11-1 带内辐射，截取自TS36.521，Table 6.5.2.3F.3-1: Minimum requirements for in-band emissions

3.1.12占用带宽 OBW

占用带宽是指以指定信道的中心频率为中心，包含发射功率99%能量所对应的频带宽度，协议要求参考表3.1.12-1。

Page 17 of 28

NB-IOT测试文档

禁止商业目的转载 2017.11 Initial Conditions Test Environment as specified in TS 36.508[7] subclause 8.1.1 Normal Test Frequencies as specified in TS 36.508 [7] subclause 8.1.3.1 Frequency ranges defined in Annex K.1.1 Test Parameters Configuration ID 1 2 3 (Note 1) Downlink Configuration N/A Modulation QPSK QPSK QPSK Uplink Configuration Ntones 1@0 1@0 12@0 Sub-carrier spacing (kHz) 3.75kHz 15kHz 15kHz Note 1: Applicable to UE supporting UL multi-tone transmissions 表3.1.12-1 占用带宽，截取自TS36.521，Table 6.6.1F.4.1-1: Test Configuration Table

3.1.13射频辐射模板 SEM

射频辐射模板指的是从NB-iot UE信道带宽边沿处到距离此边沿△fOOB，这段频率区间内的辐射需要服从的指标规范，请参考表3.1.13-1。

ΔfOOB (kHz) ? 0 ? 100 ? 150 ? 300 ? 500-1700 Emission limit (dBm) 26 -5 -8 -29 -35 Measurement bandwidth 30 kHz 30 kHz 30 kHz 30 kHz 30 kHz 表3.1.13 射频辐射模板，截取自TS36.521，Table 6.6.2.1F.3-1: category NB1 UE spectrum emission mask

3.1.14邻信道泄漏比 ACLR

邻信道泄漏比是指该信道的发射功率与泄漏到相邻信道的辐射功率的比值，如果测得邻信道上单功率大于-50dBm，则NB-iot UE的ACLR值应高于表3.1.14-1中的数值。 ACLR Adjacent channel centre frequency offset from category NB1 Channel edge Adjacent channel measurement bandwidth Measurement filter Category NB1 channel measurement bandwidth Category NB1 channel Measurement filter GSMACLR 20 dB ±200 kHz 180 kHz Rectangular 180 kHz Rectangular UTRAACLR 37 dB ±2.5 MHz 3.84 MHz RRC-filter α=0.22 180 kHz Rectangular 表3.1.14 邻信道泄漏比，截取自TS36.521 Table 6.6.2.3F-1: category NB1 UE ACLR requirements

3.1.15发射机杂散

发射机指的是无用信号产生的辐射，如谐波辐射、寄生辐射、交调分量及其他频率变换分量。

对于NB-iot UE，fOOB等于1.7MHz

Page 18 of 28

NB-IOT测试文档

禁止商业目的转载 2017.11

3.1.16发射机互调

发射机互调特性是指有用信号和通过天线进入发射机的干扰信号共存时，发射机对所产生的互调信号的抑制能力。NB-iot终端发射机互调衰减指的是有用信号的矩形滤波器测量的平均功率和互调干扰信号的矩形滤波器测量的平均功率的比值，协议要求参考表3.1.16-1。 Parameters for transmitter intermodulation BW Channel (UL) 15 kHz (1 tone) Interference Signal Frequency Offset 180 kHz 360 kHz Interference CW Signal Level Intermodulation Product Measurement bandwidth -40dBc -20 dBc -39 dBc 180 kHz 180 kHz 表3.1.16-1 发射机互调，截取自TS36.521 Table 6.7F.3-1: UE category NB1 transmitter IM requirement

3.2详细测试参数配置Configuration

3.2.1双工方式Duplex Mode

信令测试中，双工方式在Signaling中进行设置，测试界面与信令界面保持一致。请参考2.2.4.2射频频率RF Frequency。

3.2.2测试场景Scenario

有两种场景可以选择：

a.独立模式Standalone：测试测量界面独立运行，在非信令测试时使用此场景。 b.组合信号路径模式Combined Signal Path：用于进行信令测试。

c.协议测量模式 Measure@ProtocolTest：用于在执行协议测试的应用时测量射频性能，可在“Controlled by”受控状态中指定Protocol Test1来进行后续测试。

3.2.3受控状态Controlled by

受模拟小区的控制，当仪表有两个B500时，可以在此选择使用哪个信令小区进行信令交互。

3.2.4控制器设定Controller Settings

Page 19 of 28

NB-IOT测试文档

禁止商业目的转载 2017.11

在信令测试时，如果无需特殊指定，此菜单下的所有参数都应与信令界面Signaling相同。在非信令测试时，需要单独设定，仪表的默认状态是使用COM1端口和TRX1射频收发进行测试。 a.输入信号路径RF Routing（Input）：指定终端的上行信号在仪表的路径。 b.外部输入补偿External Attenuation（Input）：指定终端上行信号的补偿值。

c.频率-频带Frequency-Band：设定频率与频带，每次变更频带时，频率会被设定为该频带的中心频点。 以下参数，参考信令界面的介绍（Signaling 2.2.4.3）： d.频率补偿Frequency Offset

e.预期功率Expected Nominal Power f.余量User Margin

g.混频器电平偏移Mixer Level Offset

3.2.5测量控制Measurement Control

a.重复模式Repetition

可以选择连续测试（Continuous）或者单次测试（Single shot）。 b.停止条件Stop Condition

可以选择不设条件（None）或者测到失败值时停止（On Limit Failure）。 c.测试模式Measurement Mode

普通模式Normal：这个模式下，仪表使用当前的参考电平（Ref. Level）进行测试 （此处有待更新）

d.测量预期Measure on Exception

这个参数可以选择开启或关闭。它是用来表明是否拒绝来自CMW500标记的错误或不准确的测试结果。

OFF：此参数关闭时，测得的错误结果将被拒绝，测试继续进行，统计计数器不重置。因此，单独的错误结果不会影响这个的测量过程。

ON：所有得到的错误结果都不会被拒绝。这种模式适用于研发测试，用于分析偶尔出现的传输错误。

Page 20 of 28