Re: [B.A.T.M.A.N.] OGM overhead and routing metric proposal

O.K. I will take a look at this. RTS/CTS helps, true. But it has a few problems. e.g. most meshing protocols use broadcast packets for there management. e.g. BATMANs OGMs are broadcast. These cannot be protected with RTS/CTS. So the OGMs can collide with RTS packets from a hidden node, or OGMs from a hidden node. Another way to help reduce the hidden node problem, or interference with other nodes, is to use a low coding rate and transmit power when possible. So for example when we don't have much traffic to send to node X, it could send the packets with the lowest coding rate and low power. This keeps the interference with other nodes to a minimum. As the amount of data for X increases, the coding rate and transmit power can be increased, so increasing the available bandwidth to X, but at the same time increasing the amount of interference the traffic produces. Such a scheme to minimize interference does not play too well with your idea of putting the coding rate into the OGMs. We would have to ensure that the coding rate is the highest possible coding rate usable between two peers, not the currently used coding rate, which could be low in order to avoid interference. Shame, i plan to talk more about the hidden node problem during WBMv4. It is also a good place to discuss new ideas like adding information into the OGMs. Andrew