1. IEEE 802.11ah Use Case – Outdoor Wi-Fi for cellular traffic offloading
Month Year
doc.: IEEE yy/xxxxr0
IEEE ah Use Case – Outdoor Wi-Fi for cellular traffic offloading
Date: 22th February, 2011
Authors:
Name
Company
Address
Phone
Suhwook Kim
LG Electronics
LG R&D Complex 533, Hogye-1dong, Dongan-gu, Anyang-shi, Kyungki-do, Korea
Yongho Seok
Bonghoe Kim
John Doe, Some Company

2. Outline
We propose outdoor Wi-Fi for cellular traffic offloading as IEEE ah use case

3. About IEEE ah
This amendment defines an Orthogonal Frequency Division Multiplexing (OFDM) Physical layer (PHY) operating in the license-exempt bands below 1 GHz, e.g., MHz (Europe), 950 MHz -958 MHz (Japan),  MHz, MHz, MHz, and MHz (China), 917 – MHz (Korea) and MHz (USA), and enhancements to the IEEE Medium Access Control (MAC) to support this PHY, and provides mechanisms that enable coexistence with other systems in the bands including IEEE and IEEE P g.
The data rates defined in this amendment optimize the rate vs. range performance of the specific channelization in a given band.
This amendment also adds support for:
transmission range up to 1 km
data rates > 100 kbit/s
while maintaining the WLAN user experience for fixed, outdoor, point to multi point applications.

4. Motivation
Mobile traffic explosion is significant problem of vendors and operators

5. Motivation
Traffic offloading by WLAN is considered as good solution of mobile traffic explosion
However, current (a, g, n, ac) WLAN have short coverage and assume indoor environment
TGah has large coverage (~1km), so it can be used for mobile traffic offloading in outdoor environment

6. Use Case : Outdoor Wi-Fi for cellular traffic offloading

7. Outdoor Wi-Fi : Requirements#
Category
Comment 1
Location
Outdoor 2
Environment type
Urban, sub-urban 3
STA/AP communication
Send/receive (Web browsing, multimedia) 4
Data rate
Up to 20 Mbps 5
BER/PER requirement
PER<10% 6
Mobility
Pedestrian 7
Traffic type
Burst 8
Security requirement
High 9
Reliability 10
STA/AP capacity
STA: 50 , AP: 1 11
STA/AP category
STA: nomadic, AP: fixed 12
STA/AP elevation
STA: 1-2m, AP: 5-10m 13
Actors
Cellular device, portable smart device

8. References
[1] IEEE P Wireless LANs, IEEE ah Call for proposals, IEEE /1373r0,
[2] IEEE P Wireless LANs, Sub 1 GHz license-exempt Use Cases, IEEE /1044r0
[3] IEEE P Wireless LANs, Proposed IEEE ah Use Cases, IEEE /0017r2

9. Backup Slide

10. Offloading effect estimation
LTE-Adv. (FDD , base coverage urban)
DL(4x2): 21 ~ 27 Mbps
UL(2x4): 15 ~ 18 Mbps
802.11ac (20MHz bandwidth)
1 spatial stream:6.5 ~ 86.7 Mbps
8 spatial stream:52 ~ 693 Mbps
802.11ah (5MHz bandwidth)
1 spatial stream: ~ 18 Mbps (64QAM, R=5/6, reduced GI)

11. LTE-Adv. Simulation result Downlink (b/s/Hz/cell)
System performance
LTE-Adv.
IMT-Adv. Requirement
LTE-Adv. Simulation result
(from TR )
Test environment
Downlink (b/s/Hz/cell)
Uplink (b/s/Hz/cell)
Indoor 3
2.25
5.4 ~ 5.7
3.8 ~ 4.4
Microcellular
2.6
1.80
2.5 ~ 3.2
1.9 ~ 2.5
Base coverage urban
2.2
1.4
2.1 ~ 2.7
1.5 ~ 1.8
High speed
1.1
0.7
2.9 ~ 3.5

12. System performance
802.11ac

13. Channelization ≥20MHz bandwidth <10MHz bandwidth USA (902~928 MHz)
China ( MHz)
<10MHz bandwidth
Europe (868~868.6 MHz)
China (314~316, 430~434, 779~787 MHz)
Japan (950~958 MHz)
Korea (917 ~ MHz)