Flexible Multiplexing Mechanism for Coexistence of URLLC and EMBB Services in 5G Networks

doi:10.12142/ZTECOM.202102011

Abstract

Abstract:

5G mobile networks are envisioned to support both evolved mobile broadband (eMBB) and ultra-reliable and low latency communications (URLLC), which may coexist and interfere with each other in the same service cell in many scenarios. In this paper, we propose a dynamic 2-dimension bitmap resource indication to cancel eMBB services with a finer uplink cancellation granularity and a lower probability of false cancellation. Meanwhile, a resource indication based power control method is introduced to dynamically indicate different power control parameters to the user equipment (UE) based on different time-frequency resource groups and the proportion of overlapping resources, by which the reliability of URLLC transmission is guaranteed while the impact on the performance of the eMBB service is minimized. Furthermore, a dynamic selection mechanism is proposed to accommodate the varying cases in different scenarios. Extensive system level simulations are conducted and the results show that about 10.54% more URLLC UE satisfy the requirements, and the perceived throughput of eMBB UE is increased by 23.26%.

Key words: 5G, eMBB, power control, resource indication, uplink cancellation, URLLC

XIAO Kai, LIU Xing, HAN Xianghui, HAO Peng, ZHANG Junfeng, ZHOU Dong, WEI Xingguang. Flexible Multiplexing Mechanism for Coexistence of URLLC and EMBB Services in 5G Networks[J]. ZTE Communications, 2021, 19(2): 82-90.

Figures/Tables 19

Figure 1 TTI for scheduling URLLC and eMBB UEs

Figure 2 An example of baseline cancellation indication (BCI) multiplexing method

Figure 3 Allocated resources to cell center UE and cell edge UE for baseline cancellation indication (BCI) method

Figure 4 Resource indicated by dynamic 2D bitmap

Table 1 Minimum indication granularity with different numbers of the occupied time domain occasions

BCI	the number of OTDOs	1–7
BCI	FDIG	1/4
DPCI	the number of OTDOs	1	2	3	4	5	6	7
DPCI	FDIG	1/21	≤1/10	1/7	≤1/5	≤1/4	≤1/3	1/3

Figure 5 Various situations of overlapping between the URLLC physical uplink shared channel (PUSCH) and the eMBB PUSCH

Figure 6 Time-frequency resource indication field

Table 2 Power boosting value according to actual overlapping resource proportion

Index	Actual Overlapping Resource Proportion x	Power Boosting/dB
0	x ≤ 10%	0
1	10% < x ≤ 40%	3
2	40% < x ≤ 80%	6
3	x > 80%	9

Figure 7 An example of dynamic selection

Figure 8 The dynamic selection procedure

Table 3 System-level simulation assumptions

Parameters	Value
Carrier frequency	4 GHz
Simulation bandwidth	40 MHz
SCS	30 kHz
Channel model	UMa in TR 38.901
Antenna configuration	4 receiving antenna ports 2 transmitting antenna ports
gNB receiver	MMSE-IRC
Cell load setup	K_eMBB: 5, 10, 20, K_URLLC: 5, 10, 20 $Ω = K U R L L C, K e M B B$
TTI configuration	URLLC: 2, 3, 4 OFDM symbols eMBB: 14 OFDM symbols
HARQ	Max number of transmissions=4 with target BLER=0.01%(URLLC) or 10%(eMBB)
Traffic model	eMBB: ? Packet arrival per UE: FTP Model 3 ? Packet size: 50–600 bytes URLLC: ? Packet arrival per UE: periodic with arrival rate of 1 packet per 2 ms ? Packet size: 32 bytes
UE distribution	80% of users are outdoors 20% of users are indoors
eMBB UE function configuration	90% of users support DPCI 10% of users do not support DPCI

Table 3 System-level simulation assumptions

Parameters	Value
Carrier frequency	4 GHz
Simulation bandwidth	40 MHz
SCS	30 kHz
Channel model	UMa in TR 38.901
Antenna configuration	4 receiving antenna ports 2 transmitting antenna ports
gNB receiver	MMSE-IRC
Cell load setup	K_eMBB: 5, 10, 20, K_URLLC: 5, 10, 20 $Ω = K U R L L C, K e M B B$
TTI configuration	URLLC: 2, 3, 4 OFDM symbols eMBB: 14 OFDM symbols
HARQ	Max number of transmissions=4 with target BLER=0.01%(URLLC) or 10%(eMBB)
Traffic model	eMBB: ? Packet arrival per UE: FTP Model 3 ? Packet size: 50–600 bytes URLLC: ? Packet arrival per UE: periodic with arrival rate of 1 packet per 2 ms ? Packet size: 32 bytes
UE distribution	80% of users are outdoors 20% of users are indoors
eMBB UE function configuration	90% of users support DPCI 10% of users do not support DPCI

Figure 9 Statistics of time domain occasions occupied by URLLC

Figure 10 Actual boosted power values

Figure 11 UPT of evolved mobile broadband (eMBB) transmission for BCI and DPCI

Figure 12 UPT of evolved mobile broadband (eMBB) transmission for BPC and ROPC

Table 4 Percentage of UE satisfying reliability and latency requirements for URLLC transmission in different multiplexing methods

Multiplexing Method	$Ω = 5,10$	$Ω = 10,10$	$Ω = 20,10$
No scheme/%	84.37	78.64	66.71
BCI/%	93.33	89.87	80.64
DPCI/%	93.27	89.64	80.62
BPC/%	87.78	83.97	73.84
ROPC/%	88.34	86.47	76.77

Table 4 Percentage of UE satisfying reliability and latency requirements for URLLC transmission in different multiplexing methods

Multiplexing Method	$Ω = 5,10$	$Ω = 10,10$	$Ω = 20,10$
No scheme/%	84.37	78.64	66.71
BCI/%	93.33	89.87	80.64
DPCI/%	93.27	89.64	80.62
BPC/%	87.78	83.97	73.84
ROPC/%	88.34	86.47	76.77

Figure 13 UPT of evolved mobile broadband (eMBB) transmission for BCI and the dynamic selection mechanism

Figure 14 UPT of evolved mobile broadband (eMBB) transmission for BPC and the dynamic selection mechanism

Table 5 Percentage of UE satisfying reliability and latency requirements for URLLC transmission in different baseline methods and the dynamic selection mechanism

Combination Case	$Ω = 5,10$	$Ω = 10,10$	$Ω = 20,10$
BCI/%	93.33	89.87	80.64
BPC/%	87.78	83.97	73.84
DPCI&&ROPC/%	96.14	92.99	84.38

Table 5 Percentage of UE satisfying reliability and latency requirements for URLLC transmission in different baseline methods and the dynamic selection mechanism

Combination Case	$Ω = 5,10$	$Ω = 10,10$	$Ω = 20,10$
BCI/%	93.33	89.87	80.64
BPC/%	87.78	83.97	73.84
DPCI&&ROPC/%	96.14	92.99	84.38

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