SAN power dynamic range technical requirements and test methods
Today we continue to learn the technical requirements and testing methods of SAN's power dynamic range. It seems to be a power test, but it is actually different from the power measurement method.
01—NR-based SAN power dynamic range
Similar to NR base stations, the power dynamic range of SAN is also divided into RE power dynamics and total power dynamics. The power dynamic range requires that the SAN can perform power control, and the power control must meet a certain range. The purpose of power control is also to limit interference.
1. RE power dynamic range. What is RE (resource element)? We once mentioned in the 5G terminal radio frequency test standard (4) that RE is the smallest unit of resource division in OFDM modulation. Each RE corresponds to a subcarrier@frequency domain and an OFDM symbol@time domain.
The RE power control dynamic range is the difference between the RE power and the SAN's average RE power at maximum output power (Pmax, c, TABC) under specified reference conditions. For 1-H type SAN, under the premise that the output power of each carrier should always be less than or equal to the maximum output power of the satellite access node, each TAB connector in the working frequency band, under different RE modulation methods, RE The power dynamics should satisfy:
QPSK(PDCCH)-6dB~+4dB QPSK(PDSCH)-6dB~+3dB 16QAM(PDSCH)-3dB~+3dB 64QAM(PDSCH)0dB~0dB (optional, declared by the manufacturer)
2. Total power dynamic range refers to the difference between the maximum and minimum transmit power of OFDM symbols. For Type 1-H SAN, for each TAB connector in the operating frequency band, the upper limit of the dynamic range is the OFDM symbol power when the SAN transmits at maximum output power on all RBs. The lower bound is the average power transmitted by a single RB. OFDM symbols should carry PDSCH without RS or SSB. The following table is the minimum requirements for the total power dynamic range. The test requirements are relaxed by 0.4dB based on the minimum requirements:
For different bandwidths 5-20MHz, the increase in dynamic range is regular. Note that the increase is not based on the channel bandwidth, but based on the actual RB transmission bandwidth, as shown in the following table:
For example: the channel bandwidth increases from 5MHz to 10MHz, the dynamic range increases from 13.9dB to 17.1dB, NRB should be used for calculation, that is: 13.9+10log(52/25)=17.1dB, and so on, the dynamic range of other bandwidths It can also be calculated this way.
3. How to conduct consistency testing? First of all, there is no need to conduct special testing for the RE power dynamic range, because the subsequent EVM test will cover this test item. For the total power dynamic range, let's first understand the concept of Test model: Test model (TM).
TM actually defines a series of physical channel settings for transmitter testing. The test models (NR-SAN-FR1 TM) are divided into many types, and applicable test models may be used in each test. The benefit of specifying TM is to facilitate conformance testing, allowing all different types of equipment to work under the same configuration conditions, conduct testing and comparison, and meet unified technical standards. Therefore, unlike terminal testing, during terminal conformance testing, the configuration is issued by the base station simulator, that is, the comprehensive tester. During the test, the base station or SAN can configure and transmit independently without instructions from the terminal.
To test the total power dynamic range, you need to test OSTP (OFDM symbol TX power) under two TMs: NR-SAN-FR1-TM3.1 and NR-SAN-FR1-TM2, and then obtain it by subtraction. These two configuration conditions are the upper limit power and the lower limit power of the total power dynamic range.
According to 3GPP regulations, TM3.1 is used for the following tests:- Total power dynamic range (OFDM symbol transmit power upper limit (OSTP) at maximum power when all 64QAM PRBs are allocated; - Frequency error - EVM of 64QAM modulation (at maximum power) TM2 is used for the following tests: - Total power dynamic range (minimum OFDM symbol TX power lower limit under power (OSTP) - EVM of a single 64QAMPRB allocation (at minimum power) - Frequency error (at minimum power) We use the example of testing 5G base stations to see where OSTP is. It can be seen from the demodulation information The value of OSTP can be read directly from the system. It seems that both the RE power dynamics and the total power dynamics need to be measured in the demodulation mode.
4. For 1-O SAN, the test requirements and methods of power dynamic range are basically the same as those of 1-H. In addition to the port being tested, the test port must be conducted in the RIB, and the direction of the test must be selected in the OTA peak direction.
02—SAN power dynamic range based on 4G
Why is it based on 4G? Because of the power dynamic range test, it is not applicable to the standalone mode of NB-IoT. For RE power dynamic range, same as NR based. For the total power dynamics, everything else is the same as that based on NR, except for the technical requirements, there is only one bandwidth case: the total power dynamic range under 1.4MHz bandwidth 15kHz SCS is 7.7dB.
As for the test requirements, it is also relaxed by 0.4dB, that is, 7.3dB.
For 1-O SAN, the test requirements and methods of power dynamic range are basically the same as those of 1-H. The tested port still needs to be performed on the RIB, and the test direction must be the OTA peak direction.
Review Editor: Tang Zihong
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