Page 108 - Kaleidoscope Academic Conference Proceedings 2020

2020 ITU Kaleidoscope Academic Conference

4. SIMULATION RESULTS 80% of users are outdoors
UE distribution
In this section, system level simulation results based on 20% of users are indoors
different multiplexing methods are provided. The simulation eMBB UE function 90% of users supports DPCI
mainly includes the following four aspects: configuration 10% of users do not support DPCI

• Percentage of time domain occasions occupied by
URLLC per RUR 4.1 Percentage of time domain occasions occupied
by URLLC per RUR
• Minimum boosted power value that the URLLC can
meet the reliability requirement
0.82 0.82 2.85 2.85 2.85 5.52 5.52
3.17
3.17
• System performance comparison for different 11.23 11.23 8.74 8.74 8.74
multiplexing methods 26.09 26.09 26.09 18.17 18.17
• System performance comparison for the dynamic 37.17 37.17
selection mechanism and baseline methods PERCENTAGE(%) 84.78 84.78

The above four simulation aspects are based on a service 62.32 62.32 62.32 39.14 39.14
multiplexing system model proposed in section 2. The details
of simulation assumptions are listed in Table 3. ( 5, 5) ( 5, 10) ( 10, 5) ( 10, 10) ( 10, 20) ( 20, 5) ( 20, 10)
CELL LOAD SETUP Ω
Table 3 – System-level simulation assumptions Number of occasions occupied by URLLC in a RUR: 1 2 3 Above 3

Parameters Value Figure 9 – Statistics of time domain occasions occupied by
Carrier frequency 4 GHz URLLC

Simulation bandwidth 40 MHz To compare the BCI and DPCI method, the percentage of the
SCS 30 kHz number of time domain occasions occupied by the URLLC
per RUR is evaluated via system-level simulation. The
Channel model UMa in TR 38.901 duration of RUR is set as 1 slot. Within each RUR, there are
4 receiving antenna ports 7 time domain occasions, and each of them has 2 OFDM
Antenna configuration symbols. As shown in Figure 9, the number of occasions
2 transmitting antenna ports actually scheduled for URLLC transmission is relatively
small. In each cell load setup scenario, the ratio of cases that
BS receiver MMSE-IRC
the occupied RURs contain less than 3 time domain
KeMBB : 5, 10, 20, KURLLC : 5, 10, 20 occasions occupied by URLLC is more than 94%. Together
Cell load setup with the analysis in Table 1, we can infer that a finer
Ω = (K URLLC K , eMBB ) frequency domain indication granularity can be expected by
DPCI in most cases. In other words, DPCI has more accurate
URLLC: 2, 3, 4 OFDM symbols
TTI configuration indication granularity.
eMBB: 14 OFDM symbols
4.2 Minimum boosted power value that URLLC can
Max number of transmissions = 4 meet the reliability requirement
HARQ with target BLER = 0.01%(URLLC)
or 10%(eMBB)
In order to prove that it is reasonable to grade multiple values
eMBB: for power boosting, we intercept 100 times of conflict
between a URLLC and eMBB in a system simulation. We
- Packet arrival per UE: FTP Model repeated 10 times for each conflict with different power
3
values, and selected a minimum power value that the
- Packet size: 50~ 600 bytes URLLC UE can meet the reliability requirement. If the
Traffic model URLLC UE cannot meet the reliability requirement, the
URLLC: maximum boosted power value will be selected. For the

- Packet arrival per UE: Periodic system simulation, the cell load setup is set Ω = (10,10), and
with arrival rate of 1 packet per 2ms the minimum and maximum boosted power are 0 dB and 9
dB, respectively. The duration of RUR is assumed as 1 slot,
- Packet size: 32bytes

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