[OLSR-users] Multi-Radio Multi-Channel support in OLSR???

[Rajesh Narayanan]

no offense, but try explaining that to the multitude of mesh networking
vendors that tout multi-channel multi-radio :-). They work and they work
well! So I dont agree with your assessment as its too simple.

You are right about bleedover. There is definitely some cross channel
interference that has been studied. But I dont think it justifies not
looking at multi-radio multi-channel systems. 802.11b/g has only 3
non-interfering channels, while 802.11a has 11 (I think). So the channel
distribution you are talking about is when there are interfering channels.
These are the issues that an intelligent channel allocation scheme will need
to take care of.

Thanks,
Rajesh.


On 1/30/07, Tim Martin <(spam-protected)> wrote:
>
> I prefer to use just one radio because multiple radio's will interfere
> with each other if placed close together.  Even if one is on channel 1 and
> the other on channel 11 there can be some bleedover which will cause a lot
> of lost packets.
>
> Tim
>
>
> Rajesh Narayanan wrote:
>
> Hi,
>
> I posted this in the openwrt forum as well. Thought I might as well stir
> the hornets nest a little more. Only the OLSR part is specifically relevant
> . Has anyone looked at multi-radio multi-channel support in the OLSR
> though???
>
> I'm trying to look at any open-source implementations for MCMR. If I do
> find I'll post it here.
>
> Thanks,
> Rajesh.
>
> Here is the post
> ***************************
> It just occured to me that there might be a possible for supporting
> multi-radio multi-channel support in the OpenWRT platform. Many
> mesh-networking companies typically tout multi-radio/multi-channel support.
>
> Here is a possible method by which three Linksys routers can be combined
> to support multi-radio multi-channel.
>
> Methodology:
> 1. Hardware
>     - Put the three linksys (could be any other device) routers in Bridge
> mode.
>     - The three routers are physically connected via the ethernet LAN
> ports
>     - Lets call these routers LS1, LS2 and LS3.
>     - I have tested the bridge-mode connection and works quite well
>     - Essentially provides a very wide Layer2 connection
>     - These three linksys routers can be stacked on top of each other
> essentially providing 3 radios (you could use 2 for 2 radios)
>     - This will how a Node-group will look like
>                          \        / <-- Radio1
>                           Node1a
>                              |  <----------- Wired link
>                          \   |   /  <-- Radio2
>                           Node1b
>                              |  <----------- Wired link
>                          \   |   /  <-- Radio3
>                           Node1c
>
> 2. Software
>     - This is the secret-sauce that needs to be developed. The goal is:
>     - Launch it in each of the routers LS1, LS2, LS3
>     - Communicate among each other to know they are part of the same
> bridge
>     - Have a channel allocation scheme for each router so they do not
> mutually interfere with each other.
>     - This needs to be a modular and scalable architecture so that nodes
> can be added to the stack in an on-demand basis.
>     - The secret sauce could be developed either as a plugin for OLSR or
> for the spanning-tree-protocol implementation.
>     - The STP implementation would mean that its one big layer-2 wireless
> network with the node-groups forming some kind of non-loop network
>     - OLSR-plugin would obviously mean that all node-groups act as
> olsr-routers with intelligent channel assignment schemes.
>
> 3. References:
> * While writing this post I did some web-search and looks like there is
> already some activity that is similar to what I am suggesting -
> http://moment.cs.ucsb.edu/tic/
> * (more references later)
>
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