W ir eless Mesh Netw or k W ir eless Mesh Netw or k Technical - - PowerPoint PPT Presentation

W ir eless Mesh Netw or k W ir eless Mesh Netw or k Technical Overview Technical Overview

Danny Ng

mailto:danng@nortelnetworks.com

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What is a Wireless Mesh Network ? What is a Wireless Mesh Network ?

Access Point Access Point

Backbone Ethernet Network

IEEE 802.11 a/b/g 10/100BT Ethernet

Traditional WLAN Architecture

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What is a Wireless Mesh Network ? What is a Wireless Mesh Network ?

Access Point Access Point

Backbone Ethernet Network

IEEE 802.11 a/b/g

WLAN with Wireless Transit

10/100BT Ethernet

Wide variety of Wireless Transit technology

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What is a Wireless Mesh Network ? What is a Wireless Mesh Network ?

Access Point Access Point

Backbone Ethernet Network

IEEE 802.11 a/b/g

Wireless Mesh

10/100BT Ethernet

Wireless transit with Inter-AP ‘Meshing’ protocol

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Ent er pr ise / I SP Backbone Net wor k Ent er pr ise / I SP / Met r o Dist r ibut ion Net wor k

Prototype Network Architecture Prototype Network Architecture

I nt er net at large NAP-R2 NAP-R3 CAN-Alpha CAN-Bet a CAN-Gamma

AP = Wireless Access P

• int

C AN = Communit y Area Net work NAP-R = Net work Access P

• int Rout er

NOSS = Net work Operat ions & Support Services WG = Wireless Gat eway WMN = Wireless Mesh Net work

NAP-R1 OAM&P Service AAA Service DHCP Service Subscr iber Mgmt Service Policy Service NOSS Fir ewall, NAT, et c. Border Gat eway AP AP WG-2 WG-1

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Enterprise / ISP Enterprise / ISP Backbone Backbone Network Network

Ent er pr ise / I SP / Met r o Dist r ibut ion Net wor k

Nortel Wireless Mesh Nortel Wireless Mesh Network

Network Architecture

Architecture

I nt er net at large CAN-Alpha CAN-Bet a CAN-Gamma NAP-R1 NAP-R3 NAP-R2 WG-2 Fir ewall, NAT, et c. Border Gat eway

AP = Wireless Access P

• int

C AN = Communit y Area Net work NAP-R = Net work Access P

• int Rout er

NOSS = Net work Operat ions & Support Services WG = Wireless Gat eway WMN = Wireless Mesh Net work

OAM&P Service AAA Service DHCP Service Subscr iber Mgmt Service Policy Service 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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Ent er pr ise / I SP Backbone Net wor k

Enterprise / ISP Enterprise / ISP / Metro / Metro Distribution Network Distribution Network

Nortel Wireless Mesh Network Architecture Nortel Wireless Mesh Network Architecture

I nt er net at large NAP-R3 CAN-Alpha CAN-Bet a 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-2 WG-1 Fir ewall, NAT, et c. Border Gat eway

AP = Wireless Access P

• int

C AN = Communit y Area Net work NAP-R = Net work Access P

• int Rout er

NOSS = Net work Operat ions & Support Services WG = Wireless Gat eway WMN = Wireless Mesh Net work

OAM&P Service AAA Service DHCP Service Subscr iber Mgmt Service Policy Service NOSS

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Ent er pr ise / I SP Backbone Net wor k Ent er pr ise / I SP / Met r o Dist r ibut ion Net wor k

Nortel Wireless Mesh Network Architecture Nortel Wireless Mesh Network Architecture

I nt er net at large NAP-R2 NAP-R3 CAN-Alpha CAN-Bet a CAN-Gamma NAP-R1

Border Border Gateway Gateway

Fir ewall, NAT, et c.

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-2 WG-1

AP = Wireless Access P

• int

C AN = Communit y Area Net work NAP-R = Net work Access P

• int Rout er

NOSS = Net work Operat ions & Support Services WG = Wireless Gat eway WMN = Wireless Mesh Net work

OAM&P Service AAA Service DHCP Service Subscr iber Mgmt Service Policy Service NOSS

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Ent er pr ise / I SP Backbone Net wor k Ent er pr ise / I SP / Met r o Dist r ibut ion Net wor k

Nortel Wireless Mesh Network Architecture Nortel Wireless Mesh Network Architecture

I nt er net at large

Wireless Wireless Gateway Gateway

NAP-R2 NAP-R3 CAN-Alpha CAN-Bet a CAN-Gamma

Wireless Gateway

• Advertises reachability (within Enterprise / ISP Distribution Network) for one
• r 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 Fir ewall, NAT, et c. Border Gat eway

AP = Wireless Access P

• int

C AN = Communit y Area Net work NAP-R = Net work Access P

• int Rout er

NOSS = Net work Operat ions & Support Services WG = Wireless Gat eway WMN = Wireless Mesh Net work

OAM&P Service AAA Service DHCP Service Subscr iber Mgmt Service Policy Service NOSS

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Ent er pr ise / I SP Backbone Net wor k Ent er pr ise / I SP . Met ro Dist r ibut ion Net wor k

Nortel Wireless Mesh Network Architecture Nortel Wireless Mesh Network Architecture

I nt er net at large NAP-R2 CAN-Alpha CAN-Bet a CAN-Gamma NAP-R1 OAM&P Service AAA Service DHCP Service Subscr iber Mgmt Service Policy Service

NOSS NOSS

NAP-R3 WG-2 Fir ewall, NAT, et c. Border Gat eway

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 P

• int

C AN = Communit y Area Net work NAP-R = Net work Access P

• int Rout er

NOSS = Net work Operat ions & Support Services WG = Wireless Gat eway WMN = Wireless Mesh Net work

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Prototy p e W ireless Access Point Prototy p e W ireless Access Point Radio Networking Technology Radio Networking Technology

MN MN MN

Transit Link (TL) @ 5 GHz

• Elevat ed dual-polar ant ennas

wit h swit ched-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

• Elevat ed, dual-polar , diversit y

swit ched ant ennas.

• 802.11b/ g

Mobile nodes using standard 802.11b/g NIC and software Prototype Wireless Access Point (AP)

MN

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N S

Access Link cover age is t ypically less t han r each

• f Transit Link

Beam pat t er ns over lap t o avoid need f or alignment dur ing inst allat ion

Prototy p e W ireless Access Point Prototy p e W ireless Access Point Switched Beam Antenna for Transit Links Switched 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

Beam Frequency Polarisation Burst time

NAP P rimary dir ect ion of select ed beam Having mult iple beams alleviat es deployment dif f icult ies, even if only a f ew ar e ever used in pr act ice

N S

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Prototy p e W ireless Access Point Prototy p e W ireless Access Point Transit Link Radio System Transit 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

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Prototy p e Access Point Prototy p e Access Point

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Wireless Mesh Applications Wireless Mesh Applications

• Ad Hoc Networks
• Access Networks with minimal cable infrastrcuture
• Out door and in door campus
• Public Metro Wireless Networks

Thank You Thank You