ns2的4g（FD-LTE）补丁

针对ns2.35的4G lte补丁，附有补丁/例子和论文。Many models have been built to study the performance of LTE/SAE. However, no open source LTE/SAE model is found. It is difficult to reuse and evaluate those models. This paper proposes an open source LTE/SAE model with the implementation in NS 2. This study is the further step of the earlier one in [3]. This paper is organized in the following way: firstly, the LTE/SAE overview and the simulation tool NS 2 are described; secondly, the network model and its configuration in NS 2 are introduced. Thirdly, the traffic model and its configuration are presented. At last, an example is given to demonstrate how to use the model to analyze the performance of LTE/SAE.