Thomas, either the RF-Pipe or TDMA model will support what you are tying to do.
1. For the RF-Pipe, a few items that are useful to understand: A. You can configure and dynamically control the transmit data rate allocated to each node via the "datarate" parameter. So if you have a total of 57kbps available between the two nodes, you can split the total available rate equally between the two nodes by setting datarate="27k". Since the "datarate" parameter is run time modifiable, you can also change the allocation during you experiment as required. Note: You can also oversubscribe by allocating more than 100% of total bandwidth which would introduce loss since in theory both nodes would be transmitting at the same time. The amount of loss experienced can be based on percentage of over subscription and manged via the PCR curves. B. Managing delay on the link is also configurable and run time modifiable via the "delay" and "jitter" parameters. C. Introducing loss on the link is controlled via the Packet Completion Rate curve. You can define your own curve or use the default curve file that comes with the model. 2. The TDMA model gives you similar ability as above but via the use of a TDMA schedule. The one thing the TDMA model supports that RF-Pipe does not is the concept of packet fragmentation which may be important to you given the size of the pipe you are emulating. Kaushik B. Patel Adjacent Link LLC On 04/11/2017 10:43 AM, Thomas Halwax wrote: > Hi Steven, > > of course, sorry for my imprecise question. > > I have a setting with two nodes, one stationary and one mobile. Both nodes > use a Delay and Disruption Tolerant Network (DTN) daemon to send messages > with a varying size between 1k and 10kBytes to each other. My research goal > is to find out if this kind of communication can be done using a legacy > tactical VHF radio. Those radios have a max. data rate of 57kbit/s and can > only be operated in a half-duplex mode. The real devices I am emulation do > not operate on a TDMA basis so the RF-Pipe model was my first choice. > > I started with Demo-2 and adjusted the phy and mac parameters. Right now I am > able to transfer data between the two nodes with a net data rate varying > between 200 an 500 bytes/sec. Now I want to make sure that I chose the > appropriate RF model and that’s the reason I asked for the half-duplex > setting. > > Thank you & best regards, > Thomas > > > >> Am 11.04.2017 um 16:21 schrieb Steven Galgano <[email protected]>: >> >> Thomas, >> >> Without knowing your requirements or research goal it is hard to >> speculate on which model is best for you. The TDMA model has greater >> flexibility to emulate various wireless technologies by allowing you to >> configure slot size, data rate, frequency, bandwidth, and tx/rx slot >> assignments. I'd start with it. >> >> -steve > > > > _______________________________________________ > emane-users mailing list > [email protected] > https://pf.itd.nrl.navy.mil/mailman/listinfo/emane-users > _______________________________________________ emane-users mailing list [email protected] https://pf.itd.nrl.navy.mil/mailman/listinfo/emane-users
