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TS 37.107
Base Station (BS) Requirements and Conformance Tests
for Shared Spectrum Channel Access

Use "3GPP‑Page" to get the Word version, and "ETSI‑search" to get the PDF version
V16.3.0 (PDF)2021/06  … p.
V15.4.0  2020/12  12 p.
Rapporteur:
Miss Nurminen, RiikkaNokia Corporation

Content for  TS 37.107  Word version:  16.2.0

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1  ScopeWord‑p. 6

The present document specifies the minimum Radio Frequency (RF) characteristics, minimum performance requirements, and the RF test methods and conformance requirements for E-UTRA with LAA Base Stations (BS) and for NR-U Base Stations (BS).

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 36.141: "Evolved Universal Terrestrial Radio Access (E-UTRA); Base Station (BS) conformance testing".
[3]
ITU-R Recommendation M.1545: "Measurement uncertainty as it applies to test limits for the terrestrial component of International Mobile Telecommunications-2000".
[4]  Void.
[5]
TS 37.213: "Physical layer procedures for shared spectrum channel access".
[6]
TS 38.141-1: "NR; Base Station (BS) conformance testing Part 1: Conducted conformance testing".
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3  Definitions, symbols and abbreviations

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2  Symbols

3.3  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
BS
Base Station
E-UTRA
Evolved Universal Terrestrial Radio Access
NR
New Radio
LBT
Listen-Before-Talk
PDSCH
Physical Downlink Shared Channel
RF
Radio Frequency

4  GeneralWord‑p. 8

4.1  Relationship between minimum requirements and test requirements

The Minimum Requirements given in this specification make no allowance for measurement uncertainty. The test specification TS 36.141 Annex G defines Test Tolerances for E-UTRA, and the test specification TS 38.141-1 Annex C defines Test Tolerances for NR. These Test Tolerances are individually calculated for each test. The Test Tolerances are used to relax the Minimum Requirements in this specification to create Test Requirements.
The measurement results returned by the Test System are compared - without any modification - against the Test Requirements as defined by the shared risk principle.
The Shared Risk principle is defined in ITU-R M.1545 [3].
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5  Channel access procedures (core part)

5.1  Downlink channel access procedure

For downlink operation in Band 46, Band 49, Band n46 and Band n96, a channel access procedure for PDSCH transmission as described in TS 37.213, Clause 4.1.1 is specified.

5.1.1  Channel access parameters

Channel access related parameters for PDSCH are listed in Table 5.1.1-1.
Parameter Unit Value
LBT measurement bandwidthMHz10, 20
Energy detection thresholddBm/20MHz-72 or X (Note)
dBm/10MHz-75
Maximum channel occupancy timems8
NOTE:
The specific value X is declared by the vendor.
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5.1.2  Minimum requirement

The Base Station shall be able to assess whether the medium is busy or idle with at least 90% probability, using a channel access procedure with the parameters in Table 5.1.1-1.

6  Channel access procedures (performance part)Word‑p. 9

6.1  Downlink channel access procedure

6.1.1  Definition and applicability

Channel access procedure for downlink operation in Band 46 and Band 49 for PDSCH transmission is described in TS 37.213, Clause 4.

6.1.2  Minimum requirement

The minimum requirement is in clause 5.1.

6.1.3  Test purpose

The test purpose is to verify the accuracy of the energy detection threshold, maximum channel occupancy time (MCOT) and minimum idle time under normal conditions for all band 46 and band 49 transmitters in the BS.

6.1.4  Method of test

6.1.4.1  Initial conditions

Test environment:
RF channels to be tested for single carrier:
B, M and T; see clause 4.7 of TS 36.141.
Connect the signal analyzer to the base station antenna connector as shown in Annex I of TS 36.141.

6.1.4.2  Procedure

MCOT and minimum idle time
1)
Set the base station to transmit a signal according to E-TM 1.1 at manufacturer's declared rated output power with corresponding channel bandwidth (i.e. 10 MHz or 20 MHz). Channel Access Priority Class 3 parameters are selected to be tested based on Table 4.1.1-1 in TS 37.213.
2)
Measure the transmitter ON period during the continuous transmission (after the first channel access).
3)
Measure the transmitter OFF period between two consecutive transmitter ON periods.
4)
Verify minimum idle time as follows:
The transmitter OFF period between two consecutive transmitter ON periods shall not be less than 25 μs.
5)
Verify maximum channel occupancy time (MCOT) as follows:
  1. The duration of each transmitter ON period continuous transmission shall not exceed the maximum channel occupancy time (MCOT) requirement specified in clause 6.1.5.
 
Energy detection accuracy
6)
Generate the interfering signal of AWGN with corresponding channel bandwidth (i.e. 10 MHz or 20 MHz) at the same centre frequency as the tested channel. The interfering signal shall be at a level as specified in Table 6.1.5-1. The base station shall stop transmission on the current operating channel and will not resume normal transmissions as long as the interference signal is present.
7)
The step 6) is repeated multiple times considering the following sub-steps:
  • Interferer ON: if the interfering signal is present, the interfering signal should be present for 10ms.
  • Interferer OFF: if the interfering signal is removed, the interfering signal should be absent for 10ms.
  • The total number of interferer ON duration is assumed to be N and the total number of interferer OFF duration is assumed to be M. The value N, M and the sequence of interferer ON/OFF pattern shall be generated randomly for the test.
8)
In the test, a counter is maintained with initial value set to 0 when the test starts.
9)
For every 10ms Interferer ON period, the counter is increased by 1 if there is either an ON/OFF transition or no transmission by the DUT. To pass the test, the counter shall not be less than N*0.9.
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6.1.5  Test RequirementsWord‑p. 10

In normal conditions, the measurement result shall meet channel access related test requirements for PDSCH as listed in Table 6.1.5-1.
Parameter Unit Value
LBT measurement bandwidthMHz10, 20
Maximum energy detection thresholddBm/20MHz-72 + 4dB or X + 4dB (Note)
dBm/10MHz-75 + 4dB
Maximum channel occupancy timems8
NOTE:
The specific value X is declared by the vendor.
 
The Base Station shall be able to assess whether the medium is busy or idle with at least 90% probability, using a channel access procedure with the parameters in Table 6.1.5-1.
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$  Change historyWord‑p. 11


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