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Bugzilla – Full Text Bug Listing |
| Summary: | Custom WifiModes apparently not possible in infrastructure mode | ||
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| Product: | ns-3 | Reporter: | Gustavo J. A. M. Carneiro <gjcarneiro> |
| Component: | wifi | Assignee: | Mathieu Lacage <mathieu.lacage> |
| Status: | RESOLVED WONTFIX | ||
| Severity: | enhancement | CC: | craigdo, mathieu.lacage |
| Priority: | P3 | ||
| Version: | ns-3-dev | ||
| Hardware: | All | ||
| OS: | All | ||
(In reply to comment #0) > In related subject, I get the feeling a lot of standard data rates are missing > from the builtin ns-3 modes. Quick googling shows data rates such as 1, 2, and > 5.5 Mbit/s, see http://www.moonblinkwifi.com/differences_in_80211b_and_802.cfm OK, so I get it now that WifiNetDevice is implementing 802.11a instead of b/g. Kind of strange, but not wrong :) But never mind this comment. so, should I close this bug gustavo ? If not, can you try to rephrase it for me ? Well, the main issue remains. In NS-2 wifi, at least when I used it a couple of years ago, it was rather simple to specify custom data rates and custom basic rates; you would just say how many bit/s data rate, and how many bit/s basic rate, and so on. In NS-3 it seems to be nigh impossible. It would be a "nice to have" enhancement. But I don't have the skills to make it work, all the PHY level stuff is black magic to me. If no one else plans to provide a patch, I guess you can just close with WONTFIX. we don't need to mark this issue as WONTFIX because we could improve the current situation but I see no point in making this bug P1. Hence, marking P3 |
I was trying, unsuccessfully, to use a custom WifiMode with NS 3. The code is something like: WIMAX_DATA_RATE = 2000000 # (bit/s) wimaxWifiMode = ns3.WifiModeFactory.CreateBpsk("wimax", False, 20000000, WIMAX_DATA_RATE, 12000000) [...] wifiDevice = ns3.WifiNetDevice() mode = ns3.WifiModeValue(wimaxWifiMode) manager = ns3.ConstantRateWifiManager(DataMode=mode, ControlMode=mode) wifiDevice.SetRemoteStationManager(manager) The end result is that the station can receive packets, but is unable to associate. Even if I change WIMAX_DATA_RATE to 6000000, which is basically the same default datarate value used by ns3.ConstantRateWifiManager, it still doesn't work. If I remove my custom mode and let ns3.ConstantRateWifiManager use its default one, then it works. Now, while it is certainly possible that I have missed something, then I see code such as this in WifiPhy: void WifiPhy::Configure80211a (void) { NS_LOG_FUNCTION (this); Configure80211aParameters (); m_modes.push_back (g_6mba); m_modes.push_back (g_9mba); m_modes.push_back (g_12mba); m_modes.push_back (g_18mba); m_modes.push_back (g_24mba); m_modes.push_back (g_36mba); m_modes.push_back (g_48mba); m_modes.push_back (g_54mba); PrintModes (); } This leads me to suspect that WifiNetDevice will not work with other modes except the builtin ones. And that is a shame. In related subject, I get the feeling a lot of standard data rates are missing from the builtin ns-3 modes. Quick googling shows data rates such as 1, 2, and 5.5 Mbit/s, see http://www.moonblinkwifi.com/differences_in_80211b_and_802.cfm