1. ESS Mesh Network Interconnection Considerations
November 2003
ESS Mesh Network Interconnection Considerations
Hidenori Aoki, Jyunichiro Hagiwara and Yoichi Matsumoto
NTT DoCoMo
H.Aoki, J. Hagiwara and Y. Matsumoto - NTT DoCoMo

2. November 2003
Purpose
DoCoMo basically supports the present ESS mesh PAR and 5Criteria.
To clarify the present PAR scope includes the L2/L3 interconnection functionality.
H.Aoki, J. Hagiwara and Y. Matsumoto - NTT DoCoMo

3. Introduction ESS mesh network
Month 2002
doc.: IEEE /xxxr0
November 2003
Introduction
ESS mesh network
creates a multi-hop wireless infrastructure
offers auto-path configuration between APs in WDS
Most applications are not limited to ESS mesh internal communications
ESS mesh network must interconnect with other networks
Other networks
ESS mesh
Interconnection
H.Aoki, J. Hagiwara and Y. Matsumoto - NTT DoCoMo
John Doe, His Company

4. Interconnection Scenario
November 2003
Interconnection Scenario
Interconnection with IEEE802.3 networks
Layer 2
Bridge
MAC
PHY
IEEE802.3 LAN
ESS mesh
Interconnection with IP networks
Layer 3
IP router IP
MAC
PHY
ESS mesh
IP network
H.Aoki, J. Hagiwara and Y. Matsumoto - NTT DoCoMo

5. Issues for Path Configuration Protocols
November 2003
Issues for Path Configuration Protocols
Conformance to 802.1D
Transparent bridge
Spanning Tree protocol
Performance of path-configuration protocol in radio network environment
H.Aoki, J. Hagiwara and Y. Matsumoto - NTT DoCoMo

6. Path Configuration Protocols
November 2003
Path Configuration Protocols
2 types of path configuration protocols
Extension of Spanning Tree protocol
Conform to 802.1D
Performance for radio aware routing is limited
New protocol　
Conforming to 802.1D could become complex
Easy to optimize for radio-aware ESS mesh network
H.Aoki, J. Hagiwara and Y. Matsumoto - NTT DoCoMo

7. Interconnection to IP Network
November 2003
Interconnection to IP Network
IP router is Layer 3 technology
ESS mesh is Layer 2 path-configuraion protocol
Can we ignore the interdependency between these two layers?
Wireless access
ESS mesh NW
Gateway
Total performance
H.Aoki, J. Hagiwara and Y. Matsumoto - NTT DoCoMo

8. November 2003
Multiple Gateways
PAR indicates target number of APs up to 32. Enough for multiple gateways.
Gateway selection should consider path conditions in ESS mesh network.
Gateway #1
Path #1
ESS mesh NW
Path #2
Gateway #2
H.Aoki, J. Hagiwara and Y. Matsumoto - NTT DoCoMo

9. November 2003
Conclusions
We assume the present PAR includes Layer2/3 interaction, but if it does not, we recommend to add “gateway” terminology explicitly to the ESS mesh PAR.
H.Aoki, J. Hagiwara and Y. Matsumoto - NTT DoCoMo