G.6 Statistical testing of MBMS Performance
36.521-13GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Part 1: Conformance testingRadio transmission and receptionRelease 17TSUser Equipment (UE) conformance specification
G.6.1 General
The system simulator sends MBMS packets to the UE under test. The number of packets, the SS sends, is predefined by the test time in G.6.4. The UE under tests demodulates the MBMS packets and counts the successfully received number of MBMS packets into the UE internal MBMS packet counter. The SS reads out the counter and issues a pass fail decision.
G.6.2 Mapping of MBMS Packet ratio to BLER
The minimum requirements are designed in terms of BLER = 1%. 10 MBMS packets are included in one Transport block, constant throughout the test. The ratio of correct received MBMS packets (Mok) to transmitted packets (Mtot) is assumed to be equal to the ratio of correct received transport blocks to transmitted transport blocks. This assumption ignores the unlikely case that payload and CRC for a transport block are consistent but wrong.
G.6.3 Design of the test
The minimum requirement for all MBMS tests is BLER = 1%. All MBMS tests are performed under a fading scenario: MBSFN channel model (Table B.2.6-1). It is obvious, that this fading scenario requires a minimum test time, greater than the time, required for statistical significance. In addition the test design with the MBMS packet counter in the UE suggest a fixed test time. Without simulation the test time is set to 200 000 active subframes (Transport blocks), leading to 333 333 subframes (333sec) for FDD and 400 000 subframes (400sec) for TDD. In order to avoid the fail of a good DUT due to statistical uncertainty the minimum requirement of BLER = 1% leads to a
Test limit = 1.2352 %. (refer Table G.4.4-1)
This means a DUT actually on the limit (1%) is measured and passed with a confidence level of greater than 95%.
G.6.4 Test time for MBMS performance tests
Table G.6.4-1: Minimum Test time for MBMS
|
Test No |
Demodulation scenario (info only) |
Min No of Sub Frames |
|
|
FDD (6 of 10 subframes are active) |
TDD (5 of 10 subframes are active) |
||
|
1 |
R.37 (10 MHz, full, QPSK 1/3) (1×2 Low) MBSFN channel model |
333 333 |
400 000 |
|
2 |
R.38 (10MHz, full, 16QAM 1/2) (1×2 Low) MBSFN channel model |
333 333 |
400 000 |
|
3 |
R.39 (10 MHz, full, 64QAM 2/3) (1×2 Low) MBSFN channel model |
333 333 |
400 000 |
|
3 |
R.39-1 (5 MHz, full, 64QAM 2/3) (1×2 Low) MBSFN channel model |
333 333 |
400 000 |
|
4 |
R.40 (1.4 MHz, full, QPSK 1/3) (1×2 Low) MBSFN channel model |
333 333 |
400 000 |