On Mon, 2006-04-17 at 22:00 +0200, Fabian Deutsch wrote: > Hey, > > I just looked through the archives but didn't find anything about the > software, which is going to be used to create the wireless-mesh. > > Maybe 802.11s would have been a good start, but doesn't seem to be ready yet
I believe Michail Bletsas is planning to use the drafts as a starting point for what he's doing in that area. But as you say, it isn't a standard yet, so the best we can do is an approximation, and get to discover problems with the proposals in advance. > ... > > There are protocols like AODV and OLSR, but I'd personally prefer something > more standard. Something like OSPF. > > OSPF isn't suitable for wireless meshes currently, but there are some > efforts to extend OSPF v3 [1] in a way, so it can be used in MANETs. IIRC, Michail says there are 3 routing protocols in existence used in meshes; we do not know yet which will be most interesting in which circumstances. I don't know if any of them resemble OSPF. Which is most useful in what circumstances will require more serious experimentation. The fundamental difference between what we are doing and, say, MIT roofnet, is that the nodes are much more mobile than in a fixed system. A second topic, which is probably worth one or more PHD thesis, is for the mesh to be power aware. For example, you would probably not want all nodes forwarding all the time, if you don't need to, and would want to elect nodes that have power preferentially from those that are on battery. And for those not actively forwarding, you'd prefer to keep the radios off for most of the time. The Marvell wireless chip selected has enough smarts that such behavior could (if one is careful about space use), be done without the main CPU's intervention, by having the processor in the Marvell chip turn on the radio periodically and see if it should participate. > > ANother interesting document can be found here [4], which gives some > informations about the behaviour of MANETs with about 100 nodes. > > There is already a patch (draft)[2] for quagga[3] and a simulator 2] > available. > > fabian > > -- > [1] http://www.ietf.org/internet-drafts/draft-ogier-ospf-mdr-position-00.txt > [2] http://hipserver.mct.phantomworks.org/ietf/ospf/ > [3] http://www.quagga.net/ > [4] > http://hipserver.mct.phantomworks.org/ietf/ospf/reports/Boeing-D950-10897-1.pdf > Thanks for the pointers. Regards, - Jim -- Jim Gettys One Laptop Per Child -- olpc-software mailing list [email protected] https://www.redhat.com/mailman/listinfo/olpc-software
