1、ETSI GSM*LL-ZL 94 W 3400855 0004388 75Y . ETSI-GS M Tech n cal Specification GSM 11.21 Version: 4.1 .O Date: October 1994 Key words: European Digital Cellular Telecommunications System, Global System for Mobile Communications (GSM). GSM Radio Aspects Base Station System Equipment Specification ETSI
2、European Telecommunications Standards Institute ETSI Secretarlat Postal address: 06921 Sophia Antipolis Cedex - FRANCE Office address: Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE Tel.: +33 92 94 42 O0 - Fax: +33 93 65 47 16 This is an unpublished work the copyright in which vests in th
3、e European Telecommunications Standards Institute. All rights reserved. The information contained herein is the property of ETSI and no part may be reproduced or used except as authorised by contract or other written permission. The copyright and the foregoing restriction on reproduction and use ext
4、end to all media in which the information may be embodied. ETSI GSM*IIII-EL 94 3400855 0004389 690 m Page 3 GSY 11.21 v.4.1 .O. October 1994 Contents Foreword . 5 1 scope 7 2 Normative References . 7 3 Definitions. symbols and abbreviations 7 4 Radio interfacing . 7 4.1 PHYSICAL INTERFACE . 7 Freque
5、ncy bands and channels 7 4.1.1.1 Frequency bands . 7 4.1.1.2 4.1.2 Frequency hopping . 8 4.1.3 RF power control 8 4.1.4 Downlink discontinuous transmission (DTX) 8 4.1.5 Test environments 8 4.1.5.1 Normal test environment 8 4.1 52 Extreme test environment . 9 4.1.5.2.1 Extreme Temperature . 9 4.1 52
6、.2 Humidity 9 4.1 -5.3 Vibration . 9 4.1.6 Transmitters . 10 4.1.6.1 Static Layer 1 functions 10 4.1.6.2 Phase error and mean frequency error . 11 4.1.6.3 Mean transmitted RF carrier power 12 4.1.6.4 Transmitted RF carrier power versus time 14 4.1.6.5 Adjacent Channel Power 15 Switching transients s
7、pectrum . 18 4.1.1 Channels and channel numbering . 7 4.1.6.5.1 Spectrum due to modulation and 4.1.6.5.2 4.1.6.6 Spurious emissions from the transmitter antenna connector . 20 4.1.6.6.1 Conducted spurious emissions from the transmitter antenna connector: inside the BTS transmit band 20 4.1.6.6.2 Con
8、ducted spurious emissions from the transmitter antenna connect0 r. outside the BTS transmit band . 21 4.1.6.7 I nte nodulation attenuation 23 4.1.6.8 Intra Base Station System intermodulation attenuation . 25 4.1.7 Receivers . 27 4.1.7.1 Static Layer 1 receiver functions (nominal error ratios) . 27
9、4.1.7.2 Erroneous Frame Indication Performance 29 4.1.7.3 Static Reference Sensitivity Level . 30 4.1.7.4 Multipath Reference Sensitivity Level . 32 4.1.7.5 Reference interference level . 34 4.1.7.6. Blocking Characteristics . 38 4.1.7.7 Intermodulation Characteristics 42 4.1.7.8 Spurious emissions
10、from the receiver antenna connector . 44 Radiated spurious emissions . 45 wideband noise . 16 4.1.8 Previous page is blank ETSI . 94 3400855 0004390 302 -4 GSM 11.21 v.4.1.0 October 1994 ANNEX 1 General testing methodology 48 Test signals at the line output of the receiving unit . 48 Testing of stat
11、istical parameters 48 Detailed theoretical methodology . 51 . Al . 1 General conditions 48 Al . 1.1 Test signals at the line input of the transmitting unit . 48 Al . 1.2 Accepted uncettainty of measurement equipment 48 Al . 3.1 General theoretical methodology 49 Al . 3.2 Al . 3.3 Limitations and cor
12、rections to the theoretical methodology . 52 Al .3. 3.1 Independent emrs 52 Al .3. 3.2 Gaussian distribution . 52 Al .3. 3.3 Stationary random processes 52 Al .3. 3.4 Low error ratios . 53 Al .3. 3.5 Total corrections . 53 Al . 3.4 Altemative experimental methodology 53 Al . 3.5 Detailed definition
13、of error events . 54 Description of special test equipment . 55 Al . 4.1 Al . 4.2 Fading and multipath propagation simulator . 55 Al . 4.3 Measurement set ups for TX intemdulation . 55 Al .4. 3.1 Test Set-up for Intermodulation Attenuation (4.1.6.7.) 56 Al .4.3. 1.2 Outside RX Band . 56 Test Set-up
14、for Intra BSS Intemodulation Attenuation (4.1.6.8.) 57 RX-Band 57 Al .4.3. 2.1 Al .4.3. 2.2 TX-Band . 58 Al . 2 A1.3 A1.4 Base Station System Test Equipment (BSSTE) . 55 Al .4.3. 1.1 RX-Band . 56 Al .4. 3.2 . ANNEX 2 Number of samples needed for statictical testing 59 History . 72 ETSI GSM*LL.EL 74
15、= 3400855 OOOY37L 249 = Page 5 GSM 11.21 v.4.1 .O October 1994 Foreword ITw Page 7 GSM 11.21 v.4.1 .O: October 1994 P-GSMSOO DCS1800 E-GSM9OO 1 scope TX: RX: 935-960 MHZ 890-915 MHz 1805-1880 MHz 1710-1785 MHz 925-960 MHt aao-915 MHZ This standard specifies the testing requirements and methods for G
16、SM 900 and DCS 1800 Base Station Systems. P-GSMSOO E-GSM900 DCS1800 Unless otherwise specified, references to GSM also includes DCS1800. FI( n)=890+0.2*n 1 19)-24dBm (0.08)-0.25111) (27)-32dBm (0.5)-1.6W) (14)-19dBm (O.OS)-O.8111) (22)-27dBm (O.l 6)-0.5W) b9i-14dBm fbO.01 LO.03Mi DCS1800 micro-BTS M
17、aximum ls17L22dBm (O 05-i 1RM lest Envlronment Normal Extreme Temperature NOTE: For Extreme Temperature, configure the BSS under test with a full complement of equipment, with each carrier at full power but only test one TRX at M. Conformance requlrement Table 4: Definition of micro-BTS Power Classe
18、s The BSS shall support at least N steps of Static Power Control with respect to the declared output power. N shall at least cover the range O to 5. Static Power Level O = The maximum power declared by the manufacturer. Static Power Level O shall have a tolerance of +/-2dB under normal conditions an
19、d +/-2.5dB under extreme conditions. Static power control shall allow the RF output power to be reduced from its maximum level in at least 6 steps of nominally 2dB with a tolerance of +/-ldB referenced to the previous level. In addition, the actual absolute output power of each static RF power step
20、(N) shall be 2*N dB below the absolute output power at Static Power Level O with a tolerance of +/-3dB under normal conditions and +/- 4dB under extreme conditions. In addition to the Static Power Control levels the BSS may utilise up to M steps of dynamic Downlink Power Control. M can have an upper
21、 limit of O to 15 . Dynamic Downlink power control shall allow the RF output power to be reduced from Static Power Level O in M steps with a step size of 2dB with a tolerance of +/-1.5dB referenced to the previous level. Each dynamic Downlink Power Control level shall have a tolerance of +/-3dB unde
22、r normal conditions and +/-4dB under extreme conditions. This shall be referenced to the absolute power of 2MdB below Static Power Level O. Requirement reference GSM 05.05 Section 4.1.2 ETSI GSM+LLmZL 94 W 3400855 0004399 53T D Page 14 GSM 11.21 v.4.1.0 October 1994 4.1.6.4 lranrmltted RF carrbr pow
23、er wrsus time lest purpose To verify: 1) 2) The stability limits. 3) The time during which the transmitted power envelope must be stable (the useful part of the time slot). The maximum output power when nominally off between time slots. It is not the purpose of this test to measure the detail of the
24、 power ramps, this is measured as adjacent channel power in section 4.1.6.5. lest case The Manufacturer shall declare how many TRXs the BSS supports, and declare any TRXs which are a dedicated BCCH carrier: 1 TRX: The BSS shall not be tested. 2 TRX: One carrier shall be configured to support the BCC
25、H and the other shall be tested at B,M and T. 3 TRX: One carrier shall be configured to support the BCCH and the other two shall be tested at B, T 4 TRX or more: One carrier shall be configured to support the BCCH and three carriers tested at B, M and B, M. and T. If the Manufacturer declares that S
26、low Frequency Hopping (SFH) is supported by the BSS, the BSS shall be configured with the number of carriers and frequency allocation defined above and SFH enabled. The TRX configured to support the BCCH shall not be tested. A single time slot in a TDMA-frame shall be activated in all TRXs to be tes
27、ted, all other time slots in the TDMA-frame shall be at Pidle. Power measurements are made with a detector bandwidth of BW, where BW shall be at least 1 MHz when measuring the top portion of the burst and at least 300 kHz when measuring the rising and falling transitions. Power is measured continuou
28、sly at the BTS antenna connector of the combined transmitters for the maximum RF carrier configuration defined by the manufacturer at each of the frequencies (B,M and T) in turn. Timing is related to TO which is the transition time from bit 13 to bit 14 of the midamble training sequence for each tim
29、e slot. For timing on a per time slot basis each time slot may contain 156.25 modulating bits, or 2 time slots may contain 157 and 6 time slots 156 modulating bits according to GSM 05.1 0.Measurements shall be made at Pmax and Pmin. The time slots measured shall be displayed or stored for at least l
30、o0 complete cycles of the time slot power sequence on each of the carriers. Pmax = Power measured in Section 4.1.6.3 (Static Power Level O). Pmin = the lowest static level measured in Section 4.1.6.3. Pidie I Pmax -30dB, or Pmin - 30dB As a minimum, one time slot shall be tested on each TRX which is
31、 not a dedicated BCCH. lest Environment Normal ETSI GSN*LL.ZL 94 m 3400855 0004400 081 m Page 15 GSM 11.21 v.4.1 .O: October 1994 Conformance requlrement The output power of each time slot tested relative to time shall conform with that illustrated in Figure 1. The residual output power, if a time s
32、lot is not activated, shall be maintained at, or below, the level of - 3dBc (3kHz measurement bandwidth) in any transmit band channel. I I l I I l I TO 10 8 10 7056/13 (542.8) 10 8 10 time (us) 147 bits = 542.8 US = 7056113 US 1 timeslot = 576.9 US = 156.25 bits Figure 1 : Power/time mask for power
33、ramping of normal bursts NOTE: The OdB reference is equal to the power Pmax or Pmin. Requirement reference GSM 05.05 Section 4.5.1 4.1.6.5 Adjacent Channel Power The modulation, wideband noise and power level switching spectra can produce significant interference in the GSMSOO or DCS1800 and adjacen
34、t bands. The effect on the spectrum due to the continuous modulation, wideband noise and switching transients do not occur at the same time and are therefore specified separately : 1) 2) Switching transients spectrum Continuous modulation spectrum and wideband noise Unless otherwise stated, only one
35、 transmitter is active for the tests in this section. ETSI GSM*11.21 94 = 3400855 000440L TL8 Page 16 GSM 11.21 v.4.1.0 October 1994 4.1.6.5.1 Spectrum due to modulation and wideband nolse lest purpose To verify that the output RF spectrum due to modulation and wideband noise does not exceed the spe
36、cified levels for an individual transceiver. lest case The system under test shall be tested with one TRX active or with the BTS equipped with only one TRX at a time until all TRXs in the configuration have been tested. The testing on each of these individual TRXs shall be done at three frequencies
37、(B, M and T). a) All time slots shall be set up to transmit full power modulated with a pseudo-random bit sequence of encrypted bits apart from time slot O which shall be set up to transmit at full power but shall be modulated with noml BCCH data. The pseudo-random bit sequence may be generated by a
38、nother pseudo-random bit sequence inserted before channel encoding in the BSS. The power shall then be measured selectively with video averaging over 50 - 90 % of the useful part of the time slot excluding the midamble. The averaging shall be over at least 200 time slots and only the active burst sh
39、all be included in the averaging process. Using a filter and video bandwidth of 30 kHz the power shall be measured with the following offsets from the amer frequency: 100,200,250,400 kHz and 600 to 1800 kHz in steps of 200 kHz. b) With all time slots at the same power level, step a) shall be repeate
40、d for all static power levels specified for the equipment (Section 4.1.6.3). The specification for each static power control level shall be that specified for the maximum power of the BSS, or the class specified. c) With a filter and video bandwidth of 100 kHz and all time slots active, frequency of
41、fsets beyond 1800 kHr up to 2 MHz outside either side of the relevant TX band shall be measured. This test has to be made in a frequency scan mode, with a minimum sweep time of 75 ms and averaged over 200 active bursts. d) With all time slots at the same power level, step c) shall be repeated for al
42、l static power levels specified for the equipment (Section 4.1.6.3). The specification for each static power control level shall be that specified for the maximum power of the BSS, or the class specified. Test Environment Normal BTS Conformance requirement The power measured shall in all above cases
43、 never exceed the limits shown in Table 5. The following exceptions and minimum measurement levels shall apply: GSMSW Exceptions 1. 2. For GSMSOO BTS, if the limit according to table 5 is below -65 dBm, a value of -65 dBm shall be used instead. Above 6 MHz offset from the carrier and up to 2 MHz out
44、side of the transmit band, the test may failed up to 12 times where a level of up to -36 dBm is permitted. ETSI GSM*LL.ZL 94 3400855 0004402 954 Power level (dBm): at carrier offsets (kHz): Maximum relative level (dB) 100 200 250 400 600 1200 1800 6000 -1 200 -4800 -=43 41 39 37 35 -4OBm Requirement
45、 Reference GSM 05.05 Section 6.1 ETSI GSM*IIII-ZL 74 3400855 0004434 b7b Page 29 GSM 11.21 v.4.1.0 October 1994 BTS Type GSMQ/DCS1800 BTS 4.1.7.2 Erroneour Frame Indication Performance Test signal Input Level -84dBm lest Purpose GSMSW micro-BTS M1 GSMSOO micro-BTS M2 In GSM 05.03 a Cyclic Redundancy
46、 Check (CRC) is defined for detection of emneous Layer 2 frames or speech frames. For full-rate speech channels also addional error detecting capabilities using some soft information are needed due to DTX operation when no useful signal is transmitted to the receiver. This test verifies the reliabil
47、ity of the overall Bad Frame Indication (BFI) presented to the full-rate speech decoder and the Frame Erasure Indication (FEI) used on control channels. -77dBm -72dBm lest Case GSMSOO micro-BTS M3 DCS1800 micro-BTS M1 DCS1800 micro-BTS M2 DCS1800 micro-BTS M3 1. A test signal consisting of continuou
48、s GSM modulation of a pseudo random bit stream without mid- amble, and at a level specified in table 13, shall be applied to the receiver antenna connector. The receiver shall be configured to receive the channels TCHFS and SDCCH with their associated control channels SACCH, FACCH and RACH. -67dBm -
49、82dBm -77dBm -72dBm The resulting bitstream in the BSS after channel decoding, including the BFI or FEI as appropriate, shall be recorded for each channel type. Table 13: Test Signal input level for testing of Erroneous Frame Indication performance 2. Step 1 shall be repeated without any RF input on the channel under test. Test Environment Normal Conformance Requirement For the TCH/FS, less than 1 undetected bad speech frame (BFkO) shall occur on average in a period of 10 s. For the RACH, less than 0.02% of the frames shall be detected as error free (FEId). BTS Ty
