1. OFDMA performance in 11ax
September 2015
OFDMA performance in 11ax
Date:
Authors:
Name
Affiliations
Address
Phone
Suhwook Kim
LG Electronics
19, Yangjea-daero 11gil, Seocho-gu, Seoul , Korea
Hyeyoung Choi
Jeongki Kim
Kiseon Ryu
HanGyu Cho
Suhwook Kim, LG Electronics

2. September 2015
Introduction
The performance of OFDMA depends on both PHY and MAC, i.e., OFDMA resource unit structure, traffic and scheduling, feedback and link adaptation, and etc.
This contribution addresses OFDMA performance using PHY/MAC integrated simulator
Based on the new PHY structure and numerology which have been agreed in specification framework document [1]
Based on three topologies
Topology 1, 2 is one BSS case and
Topology 3 is OBSS case (residential scenario (SS1)) [2]
Suhwook Kim, LG Electronics

3. Simulation Setup: OFDMA operation
September 2015
Simulation Setup: OFDMA operation
UL operation
Suhwook Kim, LG Electronics

4. Simulation Setup: OFDMA operation
September 2015
Simulation Setup: OFDMA operation
UL operation
AP sends trigger frame by contending with AC_BE
Trigger frame is transmitted by MCS 0, duplicated format in every 20 MHz channels (assuming 74 bytes long)
STAs which are allocated by trigger frame send data frame
MCS, transmission subband, and maximum frame length of data frame are addressed in the trigger frame
If the station doesn’t have any queued data frame, it doesn’t send anything
If the station doesn’t have enough data frame to fill maximum frame length, it adds padding bits to data frame
STAs don’t perform CCA
AP sends each BA frame in same subband with its data frame
BA frame is transmitted by MCS 0
Contending of STAs is not permitted
Suhwook Kim, LG Electronics

5. Simulation Setup: OFDMA operation
September 2015
Simulation Setup: OFDMA operation
DL operation
Suhwook Kim, LG Electronics

6. Simulation Setup: OFDMA operation
September 2015
Simulation Setup: OFDMA operation
DL operation
AP sends data frame by contending with AC_BE
If AP doesn’t have enough data frame to 4 stations, some subband can be empty and wasted
The STA in head of AP’s queue should be selected as primary destination
Frame length is determined by primary destination
Padding bits can be used in secondary destinations
STA sends each BA frame in same subband with its data frame
BA frame is transmitted by MCS 0
Suhwook Kim, LG Electronics

7. Simulation Setup: Scheduler
September 2015
Simulation Setup: Scheduler
Scheduling resource
Maximum allocation per one station is 1 RU
1 RU: 242-tone (total 4 RUs in 80 MHz)
Two simple scheduling policy
Random
AP selects STAs randomly
Queue length
AP selects STAs in order of each queue’s length
In DL case,
primary destination is fixed (Head of AP’s queue)
frame length is determined by A-MPDU length to primary destination (legacy spec rule)
Suhwook Kim, LG Electronics

8. Random Scheduler Example UL case DL case
September 2015
Random Scheduler
Example
UL case
AP selects four STAs randomly in STA A ~ F
DL case
STA B is determined as primary destination
AP selects three STAs randomly in STA C, STA A,
STA D, and STA E
Suhwook Kim, LG Electronics

9. Queue length Scheduler
September 2015
Queue length Scheduler
Example
UL case
AP selects STA F, E, C, A in order of each queue’s length
DL case
STA B is determined as primary destination
AP selects STA A, E
STA C or D will be selected
randomly
Suhwook Kim, LG Electronics

10. Simulation Setup: Frame length and padding
September 2015
Simulation Setup: Frame length and padding
Example
UL case
DL case
Suhwook Kim, LG Electronics

11. Simulation Setup: Parameters
September 2015
Simulation Setup: Parameters
Simulator Type
PHY/MAC Integrated simulator
Tx Power (AP/STA)
23/17dBm (Topology 1, 2), 20/15dBm (Topology 3)
Antenna Gain (AP/STA)
0/-2 dBi
Traffic Model
DL only, UL only (CBR)
BSS Bandwidth
80MHz
Noise Figure
Noise Floor
-101dBm per 20MHz
Rate Control Algorithm
Fixed MCS (Topology 1, 2),
Open Loop Link Adaption (Topology 3) [3]
MSDU size (bytes)
1472
Feedback
GENIE
Max Retx 10
Symbol length
4 usec (legacy), 16usec (OFDMA)
Metrics
Throughput, *Latency [4]
Queue Size
AP: 2000 * # of associated STA, STA:2000
* The transmission latency is measured from the time that MAC receives a packet till the time that PHY starts transmitting.
Suhwook Kim, LG Electronics

12. Simulation Setup: Topologies
September 2015
Simulation Setup: Topologies
We used 3 topologies to analysis OFDMA performance in 11ax
Topology 1 and 2 are single BSS case
Pathlosses between AP and each STA are homogeneous in topology 1
But they are heterogeneous in topology 2
By topology 1 and 2, we can verify general OFDMA operation and scheduling scheme
Topology 3 is modified residential scenario in SS1
By topology 3, we can expect performance gain of 11ax OFDMA in OBSS environment
Suhwook Kim, LG Electronics

13. Topology 1 Topology description Simulation setting 1 AP and 10 STAs
September 2015
Topology 1
Topology description
1 AP and 10 STAs
AP and all STAs are co-located
Simulation setting
Fixed MCS
MCS 0: 8.6 Mbps in 242 tones (total 34.4 Mbps)
MCS 9: Mbps in 242 tones (total Mbps)
Traffic; CBR
DL only or UL only
High rate: 4 Mbps per STA in MCS 0, 50 Mbps per STA in MCS9
Low rate: 2 Mbps per STA in MCS 0, 20 Mbps per STA in MCS9
TXOP limit: 5 msec in DL only, 4.6 msec in UL only
Suhwook Kim, LG Electronics

14. Topology 1 – UL Throughput performance
September 2015
Topology 1 – UL Throughput performance
High rate traffic
Low rate traffic
Observation
High rate traffic : Throughput gain is 40~50%. The main factors of throughput gain are resolving collision and new PHY structure
Low rate traffic : OFDMA couldn’t show meaningful throughput gain because legacy network can support traffic load
Tput [Mbps]
Legacy
Random
Queue
MCS 0, 4 Mbps
20.98
29.98 (43% ↑)
MCS 9, 50 Mbps
268.64
(49% ↑)
(49% ↑)
Tput [Mbps]
Legacy
Random
Queue
MCS 0, 2 Mbps
19.00
19.99 (5.2% ↑)
MCS 9, 20 Mbps
199.27
(0.3% ↑)
(0.3% ↑)
Suhwook Kim, LG Electronics

15. Topology 1 – UL Latency performance
September 2015
Topology 1 – UL Latency performance
High rate traffic
Low rate traffic
Observation
High rate traffic: Latency gain is 30~50%.
Low rate traffic: Latency gain is about 90%. AP sent trigger frame very frequently, so STAs can send data without contending
Tput [Mbps]
Legacy
Random
Queue
MCS 0, 4 Mbps
2712.7
(45% ↓)
(45% ↓)
MCS 9, 50 Mbps
786.9
542.0 (31% ↓)
533.4 (32% ↓)
Tput [Mbps]
Legacy
Random
Queue
MCS 0, 2 Mbps
385.9
14.1 (96% ↓)
7.1 (98% ↓)
MCS 9, 20 Mbps
89.7
8.0 (91% ↓)
10.9 (88% ↓)
Suhwook Kim, LG Electronics

16. Topology 1 – DL Throughput performance
September 2015
Topology 1 – DL Throughput performance
High rate traffic
Low rate traffic
Observation
High rate traffic : Throughput gain is about 20%. Collision resolving effect disappeared in DL case. Only numerology gain remained
Low rate traffic : No OFDMA gain
Tput [Mbps]
Legacy
Random
Queue
MCS 0, 4 Mbps
26.46
31.11 (18% ↑)
31.12 (18% ↑)
MCS 9, 50 Mbps
333.13
(25% ↑)
Tput [Mbps]
Legacy
Random
Queue
MCS 0, 2 Mbps
20.00
20.00 (-)
MCS 9, 20 Mbps
199.93
(-)
(-)
Suhwook Kim, LG Electronics

17. Topology 1 – DL Latency performance
September 2015
Topology 1 – DL Latency performance
High rate traffic
Low rate traffic
Observation
High rate traffic: Latency gain is 20~40%.
Low rate traffic: Latency gain is 20~80%.
Tput [Mbps]
Legacy
Random
Queue
MCS 0, 4 Mbps
2031.0
(34% ↓)
(34% ↓)
MCS 9, 50 Mbps
683.5
513.1 (25% ↓)
511.0 (25% ↓)
Tput [Mbps]
Legacy
Random
Queue
MCS 0, 2 Mbps
4.69
1.13 (76% ↓)
MCS 9, 20 Mbps
2.68
2.02 (25% ↓)
0.72 (73% ↓)
Suhwook Kim, LG Electronics

18. Topology 2 Topology description Simulation setting 1 AP and 10 STAs
September 2015
Topology 2
Topology description
1 AP and 10 STAs
Simulation setting
Fixed MCS
TXOP limit: 5 msec
Traffic
DL only or UL only
High rate: 115 Mbps per STA
Low rate: 25 Mbps per STA
DL MCS
UL MCS
STA 1, 10
4 (51.6Mbps)
2 (25.8Mbps)
STA 2, 9
6 (77.4Mbps)
3 (34.4Mbps)
STA 3, 8
7 (86.0Mbps)
5 (68.8Mbps)
STA 4, 7
9 (114.7Mbps)
8 (103.2Mbps)
STA 5, 6
Suhwook Kim, LG Electronics

19. Topology 2 – Throughput performance
September 2015
Topology 2 – Throughput performance
High rate traffic
Low rate traffic
Observation
High rate traffic : UL throughput gain is about 50% and DL gain is 20%. Gain is similar with topology 1
Low rate traffic : DL gain is very low, but UL gain is very high. Because there is hidden terminal problem in legacy network, so legacy network shows very low throughput
Tput [Mbps]
Legacy
Random
Queue
UL, 115 Mbps
162.50
(49% ↑)
(49% ↑)
DL, 115 Mbps
238.29
(21% ↑)
(23% ↑)
Tput [Mbps]
Legacy
Random
Queue
UL, 25 Mbps
53.69
(251% ↑)
(225% ↑)
DL, 25 Mbps
238.15
(4.8% ↑)
(4.7% ↑)
Suhwook Kim, LG Electronics

20. Topology 2 – Latency performance
September 2015
Topology 2 – Latency performance
High rate traffic
Low rate traffic
Observation
High rate traffic: Latency gain is 20~60%. Gain is similar with topology 1
Low rate traffic: Latency gain is 60~90%. Generally latency gain is more higher in low rate traffic case than in high rate traffic
Tput [Mbps]
Legacy
Random
Queue
UL, 115 Mbps
2624.9
939.8 (64% ↓)
943.8 (64% ↓)
DL, 115 Mbps
981.1
786.7 (20% ↓)
793.0 (19% ↓)
Tput [Mbps]
Legacy
Random
Queue
UL, 25 Mbps
3081.1
529.4 (83% ↓)
(62% ↓)
DL, 25 Mbps
101.7
22.4 (78% ↓)
5.7 (94% ↓)
Suhwook Kim, LG Electronics

21. Topology 3 Topology description Simulation setting
September 2015
Topology 3
Topology description
20 APs (Fixed location: center of room)
4 or 10 STAs per one AP (Random location)
Simulation setting
Open Loop Link Adaption [1]
Traffic
DL only or UL only
High rate: 20 Mbps per STA in 4-STA-SIM, 8 Mbps per STA in 10-STA-SIM
Low rate: 2 Mbps per STA
TXOP limit: 5 msec
Channelization: Random choice in three channels
Suhwook Kim, LG Electronics

22. Topology 3 – UL Throughput performance
September 2015
Topology 3 – UL Throughput performance
High rate traffic
Low rate traffic
Observation
High rate traffic : Throughput gain is 30~70%.
Low rate traffic : Throughput gain is 30~250%. Even though traffic load is very low, legacy network couldn’t fully support that traffic because of OBSS interference and hidden terminal. But OFDMA can support.
Tput [Mbps]
Legacy
Random
Queue
4 STA, 20 Mbps
36.13
60.94 (69% ↑)
61.79 (71% ↑)
10 STA, 8 Mbps
41.23
55.09 (34% ↑)
61.65 (50% ↑)
Tput [Mbps]
Legacy
Random
Queue
4 STA, 2 Mbps
6.04
7.98 (32% ↑)
7.97 (32% ↑)
10 STA, 2 Mbps
5.66
19.39 (243% ↑)
18.42 (225% ↑)
Suhwook Kim, LG Electronics

23. Topology 3 – UL Latency performance
September 2015
Topology 3 – UL Latency performance
High rate traffic
Low rate traffic
Observation
High rate traffic: Latency gain is 40~90%.
Low rate traffic: Latency gain is 25~80%. Unlike topology 1 and 2, latency gain is higher in high rate traffic than low rate traffic
Tput [Mbps]
Legacy
Random
Queue
4 STA, 20 Mbps
2712.7
(45% ↓)
(45% ↓)
10 STA, 8 Mbps
1978.1
302.7 (85% ↓)
212.0 (89% ↓)
Tput [Mbps]
Legacy
Random
Queue
4 STA, 2 Mbps
45.6
10.3 (77% ↓)
33.9 (26% ↓)
10 STA, 2 Mbps
194.8
55.1 (72% ↓)
97.0 (50% ↓)
Suhwook Kim, LG Electronics

24. Topology 3 – DL Throughput performance
September 2015
Topology 3 – DL Throughput performance
High rate traffic
Low rate traffic
Observation
High rate traffic : Throughput gain is about 80%. Unlike topology 1 and 2, DL gain is higher than UL gain in topology 3. Main factors are MAC overhead and OBSS interference.
Low rate traffic : No OFDMA gain
Tput [Mbps]
Legacy
Random
Queue
4 STA, 20 Mbps
43.20
78.87 (83% ↑)
79.31 (84% ↑)
10 STA, 8 Mbps
43.46
(83% ↑)
80.92 (86% ↑)
Tput [Mbps]
Legacy
Random
Queue
4 STA, 2 Mbps
8.00
8.00 (-)
10 STA, 2 Mbps
20.00
20.00 (-)
Suhwook Kim, LG Electronics

25. Topology 3 – DL Latency performance
September 2015
Topology 3 – DL Latency performance
High rate traffic
Low rate traffic
Observation
High rate traffic: Latency gain is about 98~99%.
Low rate traffic: Latency is very low in legacy and OFDMA. Gain is not clear
Tput [Mbps]
Legacy
Random
Queue
4 STA, 20 Mbps
3497
2.17 (99% ↓)
2.92 (99% ↓)
10 STA, 8 Mbps
799.8
15.1 (98% ↓)
14.3 (98% ↓)
Tput [Mbps]
Legacy
Random
Queue
4 STA, 2 Mbps
0.19
0.29 (53% ↑)
0.37 (95% ↑)
10 STA, 2 Mbps
1.35
1.27 (6% ↓)
1.12 (17% ↓)
Suhwook Kim, LG Electronics

26. OFDMA performance tendency
September 2015
OFDMA performance tendency
We could observe following tendency in our limited simulation
Single BSS case
Throughput gain
UL OFDMA > DL OFDMA
high traffic load > low traffic load
OBSS case
DL OFDMA > UL OFDMA
OBSS > single BSS
However, we need more elaborate simulations to confirm these tendencies
Latency gain
UL OFDMA > DL OFDMA
low traffic load > high traffic load
Latency gain
DL OFDMA > UL OFDMA
No gain in DL
Suhwook Kim, LG Electronics

27. Next Step Following items will be added to OFDMA simulation
September 2015
Next Step
Following items will be added to OFDMA simulation
Different resource unit (26 tones, 52 tones, 106 tones, 484 tones)
DL & UL mixed traffic
Short packet traffic
Feedback modeling
More sophisticated scheduler
Contending by STAs and CCA after trigger frame
MU-RTS/CTS
Suhwook Kim, LG Electronics

28. September 2015
Conclusion
We addressed OFDMA performance using PHY/MAC integrated simulator
Performance metrics are throughput and latency
Performance gain of OFDMA depends on topology, traffic direction, and traffic load
OFDMA shows 20~80% throughput gain in high loaded traffic
In low traffic load, throughput gain is limited
Random scheduler and queue length scheduler show similar performance
Suhwook Kim, LG Electronics

29. Reference [1] 11-15/0132r7 Spec Framework
September 2015
Reference
[1] 11-15/0132r7 Spec Framework
[2] 11-14/0980r14 Simulation Scenarios
[3] 11-14/620r0 link adaptation for PHY SLS calibration
[4] 11-14/0571r10 11ax Evaluation Methodology
Suhwook Kim, LG Electronics

30. Backup Slide - Topology 1, UL, MCS 0
September 2015
Backup Slide - Topology 1, UL, MCS 0
Suhwook Kim, LG Electronics

31. Topology 1 – UL, MCS 0, 4 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
20.98
29.98
Latency [msec]
2712.7
1503.0
1501.5
Suhwook Kim, LG Electronics

32. Topology 1 – UL, MCS 0, 2 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
19.00
19.99
Latency [msec]
385.9
14.1
7.1
Suhwook Kim, LG Electronics

33. Topology 1 – UL, MCS 0, 4 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
20.98
29.98
Latency [msec]
2712.7
1503.0
1501.5
Suhwook Kim, LG Electronics

34. Topology 1 – UL, MCS 0, 2 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
19.00
19.99
Latency [msec]
385.9
14.1
7.1
Suhwook Kim, LG Electronics

35. Topology 1 – UL, MCS 0, 2 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
19.00
19.99
Latency [msec]
385.9
14.1
7.1
Suhwook Kim, LG Electronics

36. Backup Slide - Topology 1, UL, MCS 9
September 2015
Backup Slide - Topology 1, UL, MCS 9
Suhwook Kim, LG Electronics

37. Topology 1 – UL, MCS 9, 50 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
268.64
399.76
399.78
Latency [msec]
786.9
542.0
533.4
Suhwook Kim, LG Electronics

38. Topology 1 – UL, MCS 9, 20 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
199.27
199.86
Latency [msec]
89.7
8.0
10.9
Suhwook Kim, LG Electronics

39. Topology 1 – UL, MCS 9, 50 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
268.64
399.76
399.78
Latency [msec]
786.9
542.0
533.4
Suhwook Kim, LG Electronics

40. Topology 1 – UL, MCS 9, 20 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
199.27
199.86
Latency [msec]
89.7
8.0
10.9
Suhwook Kim, LG Electronics

41. Topology 1 – UL, MCS 9, 20 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
199.27
199.86
Latency [msec]
89.7
8.0
10.9
Suhwook Kim, LG Electronics

42. Backup Slide - Topology 1, DL, MCS 0
September 2015
Backup Slide - Topology 1, DL, MCS 0
Suhwook Kim, LG Electronics

43. Topology 1 – DL, MCS 0, 4 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
26.46
31.11
31.12
Latency [msec]
2031.0
1335.3
1331.0
Suhwook Kim, LG Electronics

44. Topology 1 – DL, MCS 0, 2 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
20.00
Latency [msec]
4.69
1.13
Suhwook Kim, LG Electronics

45. Topology 1 – DL, MCS 0, 4 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
26.46
31.11
31.12
Latency [msec]
2031.0
1335.3
1331.0
Suhwook Kim, LG Electronics

46. Topology 1 – DL, MCS 0, 2 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
20.00
Latency [msec]
4.69
1.13
Suhwook Kim, LG Electronics

47. Backup Slide - Topology 1, DL, MCS 9
September 2015
Backup Slide - Topology 1, DL, MCS 9
Suhwook Kim, LG Electronics

48. Topology 1 – DL, MCS 9, 50 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
333.13
416.73
Latency [msec]
683.5
513.1
511.0
Suhwook Kim, LG Electronics

49. Topology 1 – DL, MCS 9, 20 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
199.93
199.91
199.92
Latency [msec]
2.68
2.02
0.72
Suhwook Kim, LG Electronics

50. Topology 1 – DL, MCS 9, 50 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
416.73
Latency [msec]
683.5
513.1
511.0
Suhwook Kim, LG Electronics

51. Topology 1 – DL, MCS 9, 20 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
199.93
199.91
199.92
Latency [msec]
2.68
2.02
0.72
Suhwook Kim, LG Electronics

52. Backup Slide - Topology 1, UL
September 2015
Backup Slide - Topology 1, UL
Suhwook Kim, LG Electronics

53. Topology 2 – UL, 115Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
162.50
241.69
241.43
Latency [msec]
2624.9
939.8
943.8
Suhwook Kim, LG Electronics

54. Topology 2 – UL, 25 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
53.69
188.20
174.51
Latency [msec]
3081.1
529.4
1173.6
Suhwook Kim, LG Electronics

55. Topology 2 – UL, 115Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
162.50
241.69
241.43
Latency [msec]
2624.9
939.8
943.8
Suhwook Kim, LG Electronics

56. Topology 2 – UL, 25 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
53.69
188.20
174.51
Latency [msec]
3081.1
529.4
1173.6
Suhwook Kim, LG Electronics

57. Backup Slide - Topology 2, DL
September 2015
Backup Slide - Topology 2, DL
Suhwook Kim, LG Electronics

58. Topology 2 – DL, 115Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
238.29
288.19
294.20
Latency [msec]
981.1
786.7
793.0
Suhwook Kim, LG Electronics

59. Topology 2 – DL, 25 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
238.15
249.57
249.42
Latency [msec]
101.7
22.4
5.7
Suhwook Kim, LG Electronics

60. Topology 2 – DL, 115Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
238.29
288.19
294.20
Latency [msec]
981.1
786.7
793.0
Suhwook Kim, LG Electronics

61. Backup Slide - Topology 3, UL
September 2015
Backup Slide - Topology 3, UL
Suhwook Kim, LG Electronics

62. Topology 3 – UL, 10 STA, 8 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
41.23
55.09
61.65
Latency [msec]
1978.1
302.7
212.0
Suhwook Kim, LG Electronics

63. Topology 3 – UL, 10 STA, 2 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
5.66
19.39
18.42
Latency [msec]
194.8
55.1
97.0
Suhwook Kim, LG Electronics

64. Topology 3 – UL, 4 STA, 2 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
6.04
7.98
7.97
Latency [msec]
45.6
10.3
33.9
Suhwook Kim, LG Electronics

65. Backup Slide - Topology 3, DL
September 2015
Backup Slide - Topology 3, DL
Suhwook Kim, LG Electronics

66. Topology 3 – DL, 10 STA, 8 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
43.46
79.64
80.92
Latency [msec]
799.8
15.1
14.3
Suhwook Kim, LG Electronics

67. Topology 3 – DL, 10 STA, 2 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
20.00
Latency [msec]
1.35
1.27
1.12
Suhwook Kim, LG Electronics

68. Topology 3 – DL, 4 STA, 2 Mbps September 2015 Legacy Random Queue
Throughput [Mbps]
8.00
Latency [msec]
0.19
0.29
0.37
Suhwook Kim, LG Electronics