1. The need and complexity of in-home entertainment scenario with OBSS
Month Year
doc.: IEEE yy/xxxxr0
March 2010
The need and complexity of in-home entertainment scenario with OBSS
Date:
Authors:
Yusuke ASAI, NTT
John Doe, Some Company

2. Abstract This presentation explains:
Month Year
doc.: IEEE yy/xxxxr0
Month Year
Abstract
This presentation explains:
The need of in-home entertainment scenario with OBSS.
Brief comparison of simulation complexity to show the feasibility of the in-home entertainment scenario with OBSS.
Abbreviations:
“in-home w/o OBSS”: in-home entertainment scenario without OBSS
“in-home with OBSS”: in-home entertainment scenario with OBSS
“enterprise w/o OBSS”: enterprise scenario without OBSS
“enterprise with OBSS”: enterprise scenario with OBSS
Yusuke ASAI, NTT
John Doe, Some Company

3. March 2010
Background-1
Behavior of 11a/n/ac devices in OBSSs is one of the most crucial issues in TGac [1]-[5].
Therefore, each proposal in TGac is recommended to evaluate performances in OBSSs.
In addition, technical proposals which mitigate / suppress influence of OBSSs should be evaluated using common simulation model.
To reflect this requirement, enterprise with OBSS has been added in FREM document.
Yusuke ASAI, NTT

4. March 2010
Background-2
In Sep09 meeting, TGac agreed to add home scenario with OBSS into FREM document.
Straw poll: Do you support adding the OBSS home scenario to the FR & EM document according to document 09/1076r1
Result: yes: 31 / no: 1 / abstain: 3
In Jan10 meeting, the motion for updating FREM document has not been accepted.
Simulation complexity is an open issue for in-home with OBSS.
This document revisits the need of in-home with OBSS scenario and presents brief evaluation of simulation complexity.
Yusuke ASAI, NTT

5. The need to consider in-home with OBSS
Month Year
doc.: IEEE yy/xxxxr0
March 2010
The need to consider in-home with OBSS
TGac will expand channel bandwidth to 80MHz or more [6].
Large number of OBSSs is expected especially in apartment scenario.
Traffic with QoS should be carefully evaluated in OBSSs.
The demand for wireless video transmission in home network may be spoiled. AP AP
Signals from OBSSs AP AP AP AP AP AP AP
QoS application:
IPTV
Four 80MHz channels are
Shared by eight APs.
Yusuke ASAI, NTT
John Doe, Some Company

6. Evaluation of simulation complexity
March 2010
Evaluation of simulation complexity
We compare following three indices for brief estimation of simulation complexity:
Setup process for OBSSs
The number of traffic flows
Total traffic rate
Comparison condition:
A traffic between two STAs is
regarded as two traffic flows:
(It is assumed that DLS is not used.) AP AP
STA a
STA b
STA a
STA b
Yusuke ASAI, NTT

7. Setup process for OBSSs
March 2010
Setup process for OBSSs
As well as enterprise with OBSS, traffic model of OBSSs are the subsets of center BSS, which reduce complexity to setup for OBSS simulation. 20
BSS A AP
STA (other color)
room wall
outside wall
-20 x
-60
-40
-20 20 40 60
Yusuke ASAI, NTT

8. Additional setup for OBSS simulation
March 2010
Additional setup for OBSS simulation
As well as enterprise with OBSS, traffic model of OBSSs are the subsets of center BSS, which reduce complexity to setup for OBSS simulation. 20
BSS A
BSS B
copying AP
STA (other color)
room wall
outside wall
-20 x
-60
-40
-20 20 40 60
Yusuke ASAI, NTT

9. Additional setup for OBSS simulation
March 2010
Additional setup for OBSS simulation
As well as enterprise with OBSS, traffic model of OBSSs are the subsets of center BSS, which reduce complexity to setup for OBSS simulation. -> Simple implementation. 20
BSS C
BSS A
BSS B
copying AP
STA (other color)
room wall
outside wall
-20 x
-60
-40
-20 20 40 60
Yusuke ASAI, NTT

10. The number of traffic flows in each simulation scenario
March 2010
The number of traffic flows in each simulation scenario
Example of in-home without OBSS (17 flows) 20
BSS A AP
STA (other color)
room wall
outside wall
-20 x
-60
-40
-20 20 40 60
Yusuke ASAI, NTT

11. The number of traffic flows in each simulation scenario
March 2010
The number of traffic flows in each simulation scenario
The number of traffic flows
in in-home without OBSS
is less than that of
enterprise scenarios.
(about 77%)
Yusuke ASAI, NTT

12. Total traffic rate in each simulation scenario
March 2010
Total traffic rate in each simulation scenario
Total traffic rate of
in-home without OBSS
is much less than that of
enterprise scenario.
Note:
It is expected that these volume of
traffic rate will never achieved
in each proposal.
(Those are much larger than
the requirement of TGac.
Most of non-QoS traffic comprises
the flows of local file transfer,
which aim to saturate traffic. )
Yusuke ASAI, NTT

13. Total traffic rate in each simulation scenario
March 2010
Total traffic rate in each simulation scenario
Enterprise without OBSS is regarded as a benchmark for comparison with in-home without OBSS.
In-home with OBSS has less traffic flows.
Total traffic rate of in-home with OBSS is half as large as that in enterprise without OBSS.
These characteristics show the reasonable complexity of in-home with OBSS.
Yusuke ASAI, NTT

14. Comparison of two OBSS scenarios
March 2010
Comparison of two OBSS scenarios
Two OBSS scenarios are compared in terms of the characteristics of traffic with QoS.
Percentage of traffic flow with QoS:
in-home with OBSS: 70%
enterprise with OBSS: 39%
Yusuke ASAI, NTT

15. Comparison of two OBSS scenarios
March 2010
Comparison of two OBSS scenarios
Two OBSS scenarios are compared in terms of the characteristics of traffic with QoS.
Total traffic rate with QoS:
in-home with OBSS: 386Mbps
enterprise with OBSS: 7.2Mbps
Yusuke ASAI, NTT

16. Need of two individual OBSS scenarios
March 2010
Need of two individual OBSS scenarios
The usage models between in-home with OBSS and enterprise with OBSS quite different in terms of:
The number of QoS traffic flows
The volume of QoS traffic rate.
Therefore, two scenarios (enterprise and in-home) with OBSS should exist separately.
Yusuke ASAI, NTT

17. March 2010
Conclusion
In-home entertainment scenario with OBSS (described in doc.:09/1076r0 ) is necessary to design 11ac to achieve robust wireless video services.
Simulation complexity is briefly estimated in terms of:
simulation setup
simulation number of flows
total traffic rate
The proposed in-home with OBSS scenario has reasonable complexity.
Yusuke ASAI, NTT

18. References [1] 09/0536r0, "OBSS issue in 802.11ac"
March 2010
References
[1] 09/0536r0, "OBSS issue in ac"
[2] 09/0833r0, “Two Levels of OBSS Control in 11ac”
[3] 09/0839r0, “Consideration on Interference Management in OBSS”
[4] 09/964r3, “Home Network Simulation Scenarios with OBSS”
[5] 09/1031r0, “Measurement results for OBSS in home network scenarios”
Yusuke ASAI, NTT