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Wireless Mesh NetworkWireless Mesh Network
Technical OverviewTechnical Overview
Danny Ngmailto:[email protected]
2
What is a Wireless Mesh Network ?What is a Wireless Mesh Network ?
AccessPoint
AccessPoint
Backbone Ethernet Network
IEEE 802.11 a/b/g
10/100BT Ethernet
Traditional WLAN Architecture
3
What is a Wireless Mesh Network ?What is a Wireless Mesh Network ?
AccessPoint
AccessPoint
Backbone Ethernet Network
IEEE 802.11 a/b/g
WLAN with Wireless Transit
10/100BT Ethernet
Wide variety of WirelessTransit technology
4
What is a Wireless Mesh Network ?What is a Wireless Mesh Network ?
AccessPoint
AccessPoint
Backbone Ethernet Network
IEEE 802.11 a/b/g
Wireless Mesh
10/100BT Ethernet
Wireless transit withInter-AP ‘Meshing’ protocol
5
Enterprise / ISP BackboneNetwork
Enterprise / ISP / MetroDistribution Network
Prototype Network ArchitecturePrototype Network ArchitectureInternetat large
NAP-R2 NAP-R3
CAN-Alpha
CAN-Beta CAN-Gamma
AP = Wireless Access PointCAN = Community Area NetworkNAP-R = Network Access Point RouterNOSS = Network Operations & Support ServicesWG = Wireless GatewayWMN = Wireless Mesh Network
NAP-R1
OAM&PServiceAAA
ServiceDHCP
Service
SubscriberMgmt Service
PolicyService
NOSS
Firewall,NAT, etc.
BorderGateway
AP
AP
WG-2WG-1
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Enterprise / ISP Enterprise / ISP BackboneBackboneNetworkNetwork
Enterprise / ISP / MetroDistribution Network
Nortel Wireless Mesh Nortel Wireless Mesh NetworkNetwork ArchitectureArchitectureInternetat large
CAN-Alpha
CAN-Beta CAN-Gamma
NAP-R1
NAP-R3NAP-R2
WG-2
Firewall,NAT, etc.
BorderGateway
AP = Wireless Access PointCAN = Community Area NetworkNAP-R = Network Access Point RouterNOSS = Network Operations & Support ServicesWG = Wireless GatewayWMN = Wireless Mesh Network
OAM&PServiceAAA
ServiceDHCP
Service
SubscriberMgmt Service
PolicyService
NOSS
Enterprise/ISP Backbone Network• Carry IP traffic between Wireless Gateways (WG) and other
elements of the Enterprise / ISP Network (e.g. Border Gateways (BG), NOSS servers).
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Enterprise / ISP BackboneNetwork
Enterprise / ISPEnterprise / ISP / Metro/ MetroDistribution NetworkDistribution Network
Nortel Wireless Mesh Network ArchitectureNortel Wireless Mesh Network ArchitectureInternetat large
NAP-R3
CAN-Alpha
CAN-Beta CAN-Gamma
NAP-R2
Enterprise/ISP/Metro Distribution Network• Carry IP traffic between Wireless Gateways (WG) and Network
Access Point Routers (NAP-R).• May be a Layer 3 routed, or• May be a Layer 1 or Layer 2 transport domain
NAP-R1
WG-2WG-1
Firewall,NAT, etc.
BorderGateway
AP = Wireless Access PointCAN = Community Area NetworkNAP-R = Network Access Point RouterNOSS = Network Operations & Support ServicesWG = Wireless GatewayWMN = Wireless Mesh Network
OAM&PServiceAAA
ServiceDHCP
Service
SubscriberMgmt Service
PolicyService
NOSS
8
Enterprise / ISP BackboneNetwork
Enterprise / ISP / MetroDistribution Network
Nortel Wireless Mesh Network ArchitectureNortel Wireless Mesh Network ArchitectureInternetat large
NAP-R2 NAP-R3
CAN-Alpha
CAN-Beta CAN-Gamma
NAP-R1
BorderBorderGatewayGateway
Firewall,NAT, etc.
Border Gateway• incorporates all functions required to interface with the Internet-at-Large.• Advertises reachability to the Internet-at-Large for IP addresses assigned to WMN
subscribers and network entities.• May also provide connectivity for other, non-WMN Enterprise / ISP entities.• May also incorporate other inter-networking functions (e.g. NAT, firewall, redirection).• Has no knowledge of WMN-specific mobility and security functions.
WG-2WG-1
AP = Wireless Access PointCAN = Community Area NetworkNAP-R = Network Access Point RouterNOSS = Network Operations & Support ServicesWG = Wireless GatewayWMN = Wireless Mesh Network
OAM&PServiceAAA
ServiceDHCP
Service
SubscriberMgmt Service
PolicyService
NOSS
9
Enterprise / ISP BackboneNetwork
Enterprise / ISP / MetroDistribution Network
Nortel Wireless Mesh Network ArchitectureNortel Wireless Mesh Network ArchitectureInternetat large
WirelessWirelessGatewayGateway
NAP-R2 NAP-R3
CAN-Alpha
CAN-Beta CAN-Gamma
Wireless Gateway• Advertises reachability (within Enterprise / ISP Distribution Network) for one
or more IP subnets assigned to WMN subscribers and network entities.• Hides WMN-specific mobility and security functions from the rest of the
Enterprise / ISP Distribution and Backbone Networks.
NAP-R1
WG-1
Firewall,NAT, etc.
BorderGateway
AP = Wireless Access PointCAN = Community Area NetworkNAP-R = Network Access Point RouterNOSS = Network Operations & Support ServicesWG = Wireless GatewayWMN = Wireless Mesh Network
OAM&PServiceAAA
ServiceDHCP
Service
SubscriberMgmt Service
PolicyService
NOSS
10
Enterprise / ISP BackboneNetwork
Enterprise / ISP . MetroDistribution Network
Nortel Wireless Mesh Network ArchitectureNortel Wireless Mesh Network ArchitectureInternetat large
NAP-R2
CAN-Alpha
CAN-Beta CAN-Gamma
NAP-R1
OAM&PServiceAAA
ServiceDHCP
Service
SubscriberMgmt Service
PolicyService
NOSSNOSS
NAP-R3
WG-2
Firewall,NAT, etc.
BorderGateway
Network Operations and Support Services• Centralised monitoring and managing network operations.• Interface to distributed elements of the WMN network through standard protocols I.e.
DHCP, SNMP, RADIUS.
AP = Wireless Access PointCAN = Community Area NetworkNAP-R = Network Access Point RouterNOSS = Network Operations & Support ServicesWG = Wireless GatewayWMN = Wireless Mesh Network
11
Prototype Wireless Access Point Prototype Wireless Access Point Radio Networking TechnologyRadio Networking Technology
MN MNMN
Transit Link (TL) @ 5 GHz• Elevated dual-polar antennas
with switched-beams .• 802.11a
Existing utility pole or wall offering elevated mounting position
Access and Transit links separated in space and frequency
Access Link (AL) @ 2.4 GHz• Elevated, dual-polar, diversity
switched antennas.• 802.11b/g
Mobile nodes using standard 802.11b/g NIC and software
Prototype Wireless Access Point (AP)
MN
12
N
S
Access Link coverage is typically less than reach
of Transit Link
Beam patterns overlap to avoid need for alignment
during installation
Prototype Wireless Access PointPrototype Wireless Access PointSwitched Beam Antenna for Transit LinksSwitched Beam Antenna for Transit Links
• Antenna structure integrated into AP
– A beam is selected for communicating with each of the neighbouring APs.
• Multiple degrees of freedom for each transit link
Ø BeamØ FrequencyØ PolarisationØ Burst time
NAP
Primary direction of
selected beam
Having multiple beams alleviates deployment
difficulties, even if only a few are ever used in practice
N
S
13
Prototype Wireless Access Point Prototype Wireless Access Point Transit Link Radio SystemTransit Link Radio System
• 802.11a standard physical layer
• ‘Meshing’ protocol above the MAC layer for transit link discovery, establishment, monitoring, maintenance, re-establishment
• Automatic assignment of channels according to local conditions and AP neighbourhood
• Consideration - Availability of 5GHz band in different countries
14
Prototype Access PointPrototype Access Point
15
Wireless Mesh ApplicationsWireless Mesh Applications
• Ad Hoc Networks
• Access Networks with minimal cable infrastrcuture
• Out door and in door campus
• Public Metro Wireless Networks
Thank YouThank You