G.8.2 Test Method for Performance Test Cases

36.521-13GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Part 1: Conformance testingRadio transmission and receptionRelease 17TSUser Equipment (UE) conformance specification

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

Figure G.8.2-1 descriptively represents the course of a test based in two metrics: the noise-normalized test SNR and the performance session, represented in terms of fractional throughput. The SS shall read the sidelink packet counters twice and calculate the performance metrics based on the sample difference between both read operations. This effectively results on the discard of early sidelink counter values that might take place between their initialization at State 5A-V2X and the stabilized performance session. The test method is as follows:

1) The UE is set on State 5A-V2X, according to the procedure defined in [7]. In this process both PSCCH, PSSCH and STCH PDCP SDU counters are initialized to zero. This takes place during the initial conditions stage.

2) Once the UE is operating on State 5A-V2X, the SNR is set to the test SNR level and the scheduling of sidelink packets (PSCCH, PSSCH and/or STCH PDCP SDU) starts. This takes place during the test procedure stage.

3) Once the scheduling of sidelink packets starts, the SS shall wait for a stability window of T=10 seconds before the first PSCCH/PSSCH/STCH PDCP SDU sample counter read.

4) Upon expiration of the stability window, the SS shall perform the first PSCCH/PSSCH/STCH PDCP SDU sample counter read (Time Point A in Figure G.8.2-1) and record the retrieved values. Then the performance session starts.

5) During the performance session the SS shall record the number of transmitted sidelink packets (PSCCH, PSSCH and/or STCH PDCP SDU) starting in Time Point A and ending in Time Point B. The performance session lasts for the Test Time defined in sections G.8.3 and G.8.4 for throughput and probability of miss-detection, respectively.

6) Once the Test Time is completed the SS shall perform a second PSCCH/PSSCH/STCH PDCP SDU sample counter read (Time Point B in Figure G.8.2-1) and record the retrieved values. The SS shall use the retrieved counter values at Time Point A and Time Point B, as well as the recorded number of transmitted sidelink packets (PSCCH, PSSCH and/or STCH PDCP SDU) between Time Point A and Time Point B, to calculate the PSCCH probability of miss-detection, the PSSCH BLER and the STCH PDCP SDU loss, respectively.

Figure G.8.2-1: Proposed Test Method for V2V/V2X Performance Test Cases

According to both the test method described in this section and Figure G.8.2-1 the PSCCH probability of miss-detection can be defined as follows:

Similarly, we can define the PSSCH BLER as follows:

Finally, we can define the STCH PDCP SDU loss as follows:

Where:

P^MD = Probability of Miss-Detection

BLER = Block Error Rate

Loss_{STCH_SDU} = STCH PDCP SDU Loss rate

PSCCH_Counter = PSCCH_PACKET_COUNTER

PSSCH_Counter = PSSCH_PACKET_COUNTER

STCH_SDU_Counter = STCH_PACKET_COUNTER

T = 10 seconds stability window

PSCCH_Transmitted = Transmitted number of PSCCH transport blocks counted by the SS

PSSCH_Transmitted = Transmitted number of PSSCH transport blocks counted by the SS

STCH_SDU_Transmitted = Transmitted number of STCH PDCP SDUs counted by the SS

MNAS = Minimum Number of Active Subframes, as per Table G.8.3-1 and Table G.8.4-1 for performance tests with throughput and probability of miss-detection, respectively