1. Network Sharing Architecture
July 2005
doc.: IEEE /0721r0
September, 2005
Network Sharing Architecture
Authors:
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Yao Zhonghui, Huawei
Cheng Hong, Panasonic

2. July 2005
doc.: IEEE /0721r0
September, 2005
Purpose
This presentation proposes a network sharing architecture in one physical wireless LAN that are foundational for inter-working.
Yao Zhonghui, Huawei
Cheng Hong, Panasonic

3. September, 2005
The Multi-SSIDs Approach to support Multi-logical networks in one physical network
@SSPN1
@SSPN2
@SSPN1
@SSPN2
SSID#1
SSID#2
SSID#1
SSID#2
BSS
BSS#1
BSS#2 RF
user
@SSPN2
user
@SSPN1
user
@SSPN2
user
@SSPN1
(1) Muli-SSIDs with muiti-BSSIDs
(2) Muli-SSIDs with one BSSID
Yao Zhonghui, Huawei

4. Multi-SSIDs approach vs. Requirements
September, 2005
Multi-SSIDs approach vs. Requirements
Multi-SSIDs with multi-BSSIDs approach has been excluded by the requirement notes:
R1N3: Define functionality to support authentication with multiple SSPNs through a single AP.
Notes: It’s not acceptable to require a separate “virtual” AP for each SSPN.
Multi-SSIDs with one BSSID:
We cannot do external network selection based on SSID because of scalability requirements from R1N1
How to create the relationship with SSPN? Dynamically or static configuration?
.If we do external network based on NAI, SSID will become redundant.
Yao Zhonghui, Huawei

5. No SSID approach September, 2005 @SSPN1 @SSPN2 BSS user @SSPN2 user
It has the same effect as Multi-SSID with one BSS.
Yao Zhonghui, Huawei

6. Why don’t we provide logical networks service based on ESS?
September, 2005
Why don’t we provide logical networks service based on ESS?
@SSPN1
@SSPN2
@SSPN1
@SSPN2
SSID#1
SSID#2
ESS
ESS
user
@SSPN2
user
@SSPN1
user
@SSPN2
user
@SSPN1
(1) No-SSID approach
(2) Multi-SSIDs approach
Yao Zhonghui, Huawei

7. The Definition of ESS ESS Definition:
September, 2005
The Definition of ESS
ESS Definition:
A set of one or more interconnected basic service sets (BSSs) and intergrated local area networks (LANs) that appears as a single BSS to the logical link control (LLC) layer at any station associated with one of those BSSs.
But we don’t know how to create the relationship between a STA and a ESS. STA only know BSS, when it roam to a new BSS, It don’t determine that current BSS is in the same ESS with the old BSS.
So pre-authentication or re-authentication is required for a RSN. Owning the same SSID don’t hint that it is in the same ESS, SSID can only be used for distinguish logical network based the same BSS.
Yao Zhonghui, Huawei

8. September, 2005
How to identify an ESS?
SSID can only be used for distinguish logical network based on the same physical network.
We can identify a physical network by a MAC address.
For example, BSS is identified by BSSID that it’s a MAC address of AP.
How to identify an ESS? We also use a MAC address, named as ESSID.
ESS as an isolated local network
A broadcast MAC address may be used to identify a isolated ESS.
ESS as an AN
The address of entrance that connects with external network
Yao Zhonghui, Huawei

9. ESS identified by Entrance Address in an 802.11u network
September, 2005
ESS identified by Entrance Address in an u network AS
TOE
SSPN
AS/
proxy GW
TOE
SSPN
Entrance
Entrance
ESSID#1
ESSID#2
DSM AP AP AP AP
BSSID#1
BSSID#2
BSSID#3
BSSIS#4
STA1
STA3
TOE
Yao Zhonghui, Huawei

10. Network Sharing Architecture
September, 2005
Network Sharing Architecture
SSPN
(NAI#1)
SSPN
(NAI#2)
SSPN
(NAI#3)
SSPN
(NAI#1)
SSPN
(NAI#2)
SSPN
(NAI#3)
SSID#1
SSID#2
SSID#3
SSID#4
ESS
(ESSID#1)
ESS
(ESSID#2)
ESS
(ESSID#1)
ESS
(ESSID#2)
BSS
(BSSID#1)
BSS
(BSSID#1)
(2) with SSID
(1) No SSID
Yao Zhonghui, Huawei

11. Network Sharing architecture is foundational for inter-working
September, 2005
Network Sharing architecture is foundational for inter-working
Network Selection means to determine a path for a STA from a specific BSS to a required External network. The Path is identified by USER-address: NAI: ESSID: BSSID. USER address can be a IP address or/and a MAC address
A WLAN AN should support those different paths in a one system that can be independently controlled by related SSPN AS. This is related with SSPN interface requirements.
One STA can get more than one IP address to support multi-flow. This is related with User Plane Cluster requirements.
Yao Zhonghui, Huawei