// // Copyright (C) 2006 Andras Varga and Levente Mészáros // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. // // // Implementation of the 802.11b MAC protocol. This module is intended // to be used in combination with the Ieee80211Radio module as the physical // layer. (The SnrEval80211 and Decider80211 modules should also work if // per-packet bitrate setting gets implemented.) // // Encapsulation/decapsulation must be done in the upper layers. (It is // typically in the 802.11 management module, see in Ieee80211Nic). // The base class for 802.11 frame messages is Ieee80211Frame, but this // module expects Ieee80211DataOrMgmtFrame (a subclass) from upper layers // (the management module). This module will assign the transmitter address // (address 2) and the frame sequence number/fragment number fields in the // frames; all other fields must already be filled when this module gets // the frame for transmission. // // The module has an internal queue, but usually it is to be used with an // external passive queue module (its name should be given in the queueModule // parameter; specifying "" causes the internal queue to be used). The passive // queue module is a simple module whose C++ class implements the IPassiveQueue // interface. // // <b>Limitations</b> // // The following features not supported: 1) fragmentation, 2) power management, // 3) polling (PCF). Physical layer algorithms such as frequency hopping and // direct sequence spread spectrum are not modelled directly. // // Fields related to the above unsupported features are omitted from // management frame formats as well (for example, FH/DS/CF parameter sets, // beacon/probe timestamp which is related to physical layer synchronization, // listen interval which is related to power management, capability information // which is related to PCF and other non-modelled features). // simple Ieee80211Mac parameters: address : string, // MAC address as hex string (12 hex digits), or // "auto". "auto" values will be replaced by // a generated MAC address in init stage 0. queueModule: string, // name of optional external queue module maxQueueSize: numeric const, // max queue length in frames; only used if queueModule=="" bitrate: numeric const, rtsThresholdBytes: numeric const, // longer messages will be sent using RTS/CTS; use 2346 for default retryLimit: numeric const, // maximum number of retries per message, -1 means default cwMinData: numeric const, // contention window for normal data frames, -1 means default cwMinBroadcast: numeric const; // contention window for broadcast messages, -1 means default gates: in: uppergateIn; out: uppergateOut; in: lowergateIn; out: lowergateOut; endsimple