Wireless meshes: disruptive technology coming your way
Wireless mesh networks have the potential to disrupt the
existing telecom set-up, say Jerome Buvat, Manager, and Ashish Sidhra, Senior
Consultant, CapGemini Telecom and Media Strategy Lab, London / Mumbai.
Throughout the history of the telecommunications sector, new technologies have
evolved that offer the user superior value. The telephone replaced the telegraph,
wireless surpassed fixed line, and VoIP evolved to replace circuit-switched
technology. These events bear testimony to the fact that telecom is a breeding
ground for disruptive technologies.
True to this historical trend, a new technology is knocking
on the doors of the telecom industrythe wireless mesh network.
Like many of its predecessors, this technology has significant potential to
disrupt the current telecom setup. Let us look at what makes mesh networks disruptive.
We will also explore the imperatives for the success of this technology, and
its possible evolution over the next couple of years.
Wireless mesh networks are peer-to-peer wireless communication
systems that let two devices communicate directly, instead of being routed through
a central switch.
Unlike in a conventional network, end-user devices in a mesh network, in addition
to sending their own data, act as routers or repeaters relaying signals for
other devices. The routing information of a conventional network resides in
the central switch, whereas this intelligence is distributed among the mesh
entities, making it decentralised.
This allows each meshed transmitter node to relay signals to several other nodes,
as opposed to conventional transmitter nodes, which talk to each other through
the central switch.
Additionally, backhaul communication of mesh networks is over the air, requiring
substantially less wiring than a conventional network to connect the transmitter
nodes to the central switch.
Vendors are offering mesh solutions under two basic architectures that try to
balance network scalability with throughput.
The network mesh creates a wireless mesh only among transmitter nodes. In such
networks client devices do not relay data for other devices. This semi-mesh,
by virtue of dumb-user devices, restricts the number of transmitters, permitting
low routing signal overheads.
The client mesh, on the other hand, enables a wireless mesh among the client
devices in addition to the transmitter nodes, allowing them to relay data for
other devices. The true mesh allows the creation of peer-to-peer networks, improving
coverage and the robustness of the network. A few vendors are backing this architecture
with proprietary routing algorithms.
Motorola is one such vendor offering a client mesh architecture
via its wireless PCMCIA cards. Most vendors offer a semi-mesh architecture because
their routing algorithms do not support the huge signalling overheads associated
with a large-scale, true mesh deployment.
With mesh networks, users need not search for hotspots
as they get a city-wide, fully mobile, broadband connection. Mesh network
customers get to experience a higher quality service as high network redundancy
prevents link drops and outages
Wi-Fi Finds Favour
Mesh protocols are frequency-agnostic, and can be used with technologies such
as Wi-Fi, Bluetooth, Zigbee, and Ultra-wide band (UWB). However, with the growing
customer uptake of 802.11 Wi-Fi, vendors are increasingly using these standards
for implementing mesh networks.
Wi-Fi-based mesh networks enable customers to continue using existing Wi-Fi
devices without hardware or software upgrades. The growing use of Wi-Fi devices
is likely to boost the deployment of Wi-Fi-based mesh networks.
The strong value that mesh networks offer the user and the substantially lower
entry barriers for greenfield operators have prompted the uptake of this technology
as an alternate solution for offering broadband services. This is what makes
it potentially disruptive for incumbent operators.
User Value Proposition
On the demand side, mesh networks offer substantial benefits to users in terms
of better features, lower costs and an enhanced experience.
The peer-to-peer nature of mesh networks encourages users to set up their own
networks, with each participant in the network owning and maintaining its own
hardware. This allows some customers to bypass operators for local communications.
Users get download speeds of 3x6x cable/DSL, and about 12x15x data
speeds compared to a conventional 3G network. Mesh networks based on UWB are
slated to provide data speeds of up to 400 Mbps.
Mesh wireless broadband offerings are available at nearly a fifth of cellular
data prices, one-third of DSL/cable price points, and at nearly half the price
of Wi-Fi offerings, with faster installation at a lower cost due to the reduced
With mesh networks, users need not search for hotspots as they get a city-wide,
fully-mobile, broadband connection. Mesh network customers get to experience
a higher quality service as high network redundancy prevents the link drops
and outages which are common in other wireless networks.
Lowered Entry Barriers
Mesh networks enable operators to shorten service-launch timelines by overcoming
regulatory barriers. With their frequency-agnostic properties, mesh networks
can be launched on licence-free technologies like Wi-Fi. This enables operators
to bypass the prolonged process associated with spectrum allocations for commercial
Unlicenced spectrum and the absence of an expensive wired backbone enable operators
to set up mesh networks with much lower capital expenditure than networks based
on other technologies. Automatic configuration and topology selection enable
low maintenance and operational costs.
In addition, due to the shorter transmission distances involved, mesh transmitters
consume less power compared to other wireless technologies.
Dynamic routing and no central point of failure enable the networks to operate
even if nodes are removed or damaged. Mesh systems use dynamic node discovery
and automatic selection of topology to install and integrate the nodes without
further configuration requirements. Mesh technology lowers entry barriers for
greenfield operators, enabling players to challenge incumbent cellular and broadband
The past few months have seen increased deployment of mesh networks around the
world. As a true disruptive technology, mesh networks are largely being deployed
by new entrants like greenfield operators and community-based network players.
According to industry estimates, around 100 municipalities around the world
are using mesh-based networks in one form or the other.
However, not all innovations identified as disruptive succeed in entering the
mainstream. Disruptive technologies have had their own fair share of successes
and failures. While VoIP, ADSL and digital cameras are some of the much publicised
successful disruptions, the cases of Betamax or laserdisks vs. VHS are two classic
failures of disruptive technologies.
If we analyse mesh networks against these parameters, we find that the following
factors will help the technology move to the mainstream.
User appeal: Mesh networks have an established primary
target audience in large geographical pockets still waiting to go broadband
live. They have already generated successful references for commercial deployments
in niche segments, and are now moving towards large-scale city-wide deployments.
Partner ecosystem: For mesh networks to become mainstream,
an ecosystem of equipment vendors, application providers, CPE
manufacturers and operators has to evolve to establish a robust value chain.
It is imperative that R&D support be maintained or even raised to higher
levels for improving current performance levels.
The mesh phenomenon has started to gather steam, and big players such as Motorola
and Nortel have joined the mesh platform in the past few months. Large Wi-Fi
operators like Boingo have also begun tying up with mesh-based service providers.
Standards and regulations: All current mesh offerings
are based on proprietary protocols and are not inter-operable with each other.
This may hinder faster uptake of the technology because the incompatibilities
between proprietary networks will prevent groups of mesh users from communicating
with each other directly.
That said, progress has been made towards standardisation by setting up a new
IEEE task group in July 2004. This group is working on wireless mesh standards
known as IEEE 802.11s. Publication of these standards is estimated to be at
least three years away.
When used with Wi-Fi standards, mesh networks do not face any regulatory challenges
as the 2.4 GHz band is globally licence-free. As for the 5 GHz frequency band,
although it is an unlicenced band in Europe, some countries do not allow its
Security Issues: Since most current implementations
of mesh networks are based on Wi-Fi, questions are bound to arise on the security
aspect. To counter this, mesh vendors claim they have developed protocols providing
built-in security mechanisms like advanced encryption on the backbone link and
user authentication. Additionally, work is already in progress to incorporate
the IEEE 802.11i security standards into Wi-Fi mesh products.
Technological Stability: A large city-wide mesh network
may have its bandwidth choked by too many routing information updates. Similarly,
the ability to maintain low latencies over multiple hops is an area of concern.
Sustained bandwidth availability with low latencies is a must for providing
services like Video on Demand (VoD) and VoIP.
Solutions On Offer
Vendors have come up with innovative solutions to overcome
these issues. On offer are multi-radio solutions to provide sustained bandwidth,
and software suites to create QoS solutions for applications like VoD and VoIP.
However, to date there is no installation large enough to substantiate the claims.
Unlicenced spectrum and the absence of an expensive
wired backbone enable operators to set up mesh networks with much lower
capital expenditure than networks based on other technologies. Automatic
configuration and topology selection enable low maintenance and operational
Give It A Couple Of Years
Mesh technology possesses most of the necessary success drivers, and work is
continuing to resolve the remaining glitches. As barriers are removed over the
next few years, and as the technology evolves, ironing out performance issues,
the disruptive potential of mesh networks will grow in scale and scope.
It is possible that 2005 will see niche segment mesh implementations give way
to increased deployments of large-scale, city-wide broadband networks. By 2006,
based on the performance results of broadband deployments in cities like Taipei
and Philadelphia, we can expect the number of greenfield operators to mushroom
globally, trying to replicate the success.
The biggest trigger for mass deployment of large scale mesh networks will be
the availability of the 802.11s standardisation in 2007 which will bring the
true disruptive potential of these networks to fruition.