6 Channel access procedures (performance part)
37.1073GPPBase Station (BS) requirements and conformance tests for shared spectrum channel accessRelease 17TS
6.1 Downlink channel access procedure
6.1.1 Definition and applicability
Channel access procedure for downlink operation in band 46, band 49, band n46 and band n96 for PDSCH transmission is described in TS 37.213 [5], 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 for band 46 and band 49
Test environment: normal; see Annex D.2 of TS 36.141 [2].
RF channels to be tested for single carrier: B, M and T; see clause 4.7 of TS 36.141 [2].
Connect the signal analyzer to the base station antenna connector as shown in Annex I of TS 36.141 [2].
6.1.4.1a Initial conditions for band n46 and band n96
Test environment: Normal, see annex B.2 of TS 38.141-1 [6].
RF channels to be tested: M; see clause 4.9.1 of TS 38.141-1 [6].
Set the channel set-up of the connector under as shown in annex D.1 for BS type 1-C and annex D.3 for BS type 1-H in [6].
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) for band 46 and 49, or
Set the base station to transmit a signal according to NR-FR1-TM1.1 at manufacturer’s declared rated output power with corresponding channel bandwidth i.e. 10 MHz (only for band n46) or 20 MHz for band n46 or n96.
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:
a) 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.
6.1.5 Test Requirements
In normal conditions, the measurement result shall meet channel access related test requirements for PDSCH as listed in Table 6.1.5-1.
Table 6.1.5-1: Channel access test requirements for PDSCH
|
Parameter |
Unit |
Value |
|
LBT measurement bandwidth |
MHz |
10, 20 |
|
Maximum energy detection threshold |
dBm/20MHz dBm/10MHz |
-72 + 4dB or X + 4dB (Note) -75 + 4dB |
|
Maximum channel occupancy time |
ms |
8 |
|
NOTE: The specific value X is declared by the vendor. |
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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.
Annex A (informative):
Change history
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Change history |
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Date |
Meeting |
TDoc |
CR |
Rev |
Cat |
Subject/Comment |
New version |
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2018-03 |
RAN4#86 |
R4-1802453 |
TS skeleton created from 3GPP TS template. |
0.0.1 |
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2018-05 |
RAN4#87 |
R4-1807758 |
Updated TS draft for 37.107 with core part and corrections |
0.1.0 |
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2018-06 |
RAN#80 |
RP-181132 |
v1.0.0 submitted for plenary approval |
1.0.0 |
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2018-06 |
RAN#80 |
Approved by plenary – Rel-15 spec under change control |
15.0.0 |
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2018-09 |
RAN#81 |
RP-181901 |
0001 |
F |
Moving Section 9 from 36.141 to 37.107 |
15.1.0 |
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2020-06 |
RAN#88 |
RP-200989 |
0002 |
1 |
F |
CR to TS 37.107 with correction to interfering signal for conformance test for energy detection accuracy to align withTS 37.213 |
15.2.0 |
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2020-06 |
SA#88 |
– |
– |
– |
– |
Update to Rel-16 version (MCC) |
16.0.0 |
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2020-09 |
RAN#89 |
RP-201512 |
0005 |
A |
CR to 37.107 with correction of references to TS 37.213 Rel-16 |
16.1.0 |
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2020-09 |
RAN#89 |
RP-201914 |
0007 |
B |
CR to TS 37.107 with introduction of NR-U feature – core part |
16.1.0 |
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2020-12 |
RAN#90 |
RP-202499 |
0009 |
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A |
CR to 37.107 with update of EDT level |
16.2.0 |
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2021-06 |
RAN#92 |
RP-211094 |
0010 |
B |
CR to TS 37.107 with NR-U introduction for performance part |
16.3.0 |
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Change history |
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Date |
Meeting |
TDoc |
CR |
Rev |
Cat |
Subject/Comment |
New version |
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2022-03 |
SA#95 |
Update to Rel-17 version (MCC) |
17.0.0 |
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