1. NS2中的Tdma時幀結構如下圖：
其中前導的數據結構為：static int *tdma_preamble_;
tdma_preamble_ = new int[max_slot_num_]; //max_slot_num_為節點總數
tdma_preamble_[slot_num_] = ETHER_ADDR(MAC_TDMA(pktTx_)->dh_da);
//前導中存儲的是目標節點的Mac地址（4個字節），slot_num_表示當時隙號。
在前導時隙這段時間，完成的主要工作就是設置tdma_preamble_[0]到
tdma_preamble_[ max_slot_num_ - 1]的值，代表從0到max_slot_num_-1個數據時隙各個時隙中要發送數據的目標節點地址。
2. 整個Tdma的類圖如下：
3. Tdma執行過程和關鍵的時隙控制函數如下圖：
4. 設置前導中數據的函數makePreamble過程：
5. 發送函數流程圖：
6. 接收函數流程圖：
7. 一個例子分析，場景：三個節點，相互可見，單信道下節點0和1幾乎同時在0.020001秒即20毫秒的時候給2發送數據，2只接收不發送，仿真在1秒時結束。
Mac層采用NS2自帶的Tdma協議，則：
Tdma的時幀結構為：
輸出的結果顯示：
<0>, 0.000000, make the new preamble now.
<0>, 0.000000, write NO_PKT to slot 0 in preamble
<1>, 0.000000, make the new preamble now.
<1>, 0.000000, write NO_PKT to slot 1 in preamble
<2>, 0.000000, make the new preamble now.
<2>, 0.000000, write NO_PKT to slot 2 in preamble
<0>, 0.006000, time to send.
<1>, 0.006000, preamble[0]=-2, nothing to do now.
<2>, 0.006000, preamble[0]=-2, nothing to do now.
<0>, 0.012000, preamble[1]=-2, nothing to do now.
<1>, 0.012000, time to send.
<2>, 0.012000, preamble[1]=-2, nothing to do now.
<0>, 0.018000, preamble[2]=-2, nothing to do now.
<1>, 0.018000, preamble[2]=-2, nothing to do now.
<2>, 0.018000, time to send.
<0>, 0.024000, make the new preamble now.
<0>, 0.024000, write -1 to slot 0 in preamble
<1>, 0.024000, make the new preamble now.
<1>, 0.024000, write -1 to slot 1 in preamble
<2>, 0.024000, make the new preamble now.
<2>, 0.024000, write NO_PKT to slot 2 in preamble
<0>, 0.030000, time to send.
<1>, 0.030000, preamble[0]=-1, I am supposed to receive now.
<2>, 0.030000, preamble[0]=-1, I am supposed to receive now.
<0>, 0.036000, preamble[1]=-1, I am supposed to receive now.
<1>, 0.036000, time to send.
<2>, 0.036000, preamble[1]=-1, I am supposed to receive now.
<0>, 0.042000, preamble[2]=-2, nothing to do now.
<1>, 0.042000, preamble[2]=-2, nothing to do now.
<2>, 0.042000, time to send.
.......
從上面可以看出，NS2中自帶的Tdma的實現是極其簡單的，時隙分配算法也特別簡單。
Ubuntu 13.04 安裝NS2.35 http://www.linuxidc.com/Linux/2014-03/98266.htm
Linux平台下NS2.35安裝 http://www.linuxidc.com/Linux/2013-11/93055.htm
NS2.33在Ubuntu 12.10的完整安裝過程及相關問題 http://www.linuxidc.com/Linux/2013-05/84032.htm
NS2.33中安裝Noah協議 http://www.linuxidc.com/Linux/2012-06/63764.htm
NS2使用tcl腳本debug工具tcl-debug-2.0 http://www.linuxidc.com/Linux/2012-06/63761.htm
