1.打开官网
https://www.3gpp.org/
2.点击

3.在界面选择要找的series，跳转到查找界面

以V2X通信协议为例，论文中通常会看到许多应用：
[7] “Study on evaluation methodology of new Vehicle-to-Everything (V2X) use cases for LTE and NR,” 3GPP, Sophia Antipolis, France, Rep. TR 37.885, release 16, 2018
[14] “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Study on LTE-based V2X Services,” 3GPP TR 36.885 V14.0.0, Release 14, Jun. 2016.
[17] Study on Enhancement of 3GPP Support for 5G V2X Services, document 3GPP TR 22.886, V15.1.0, Mar. 2017
[13] Study on LTE-Based V2X Services, document TR 36.885 V14.0.0, 3GPP, Jul. 2016
[12] Service Requirements for Enhanced V2X Scenarios (V16.2.0, Release16), 3GPP Standard TS 22.186, Jun. 2019
[34] Architecture Enhancements for V2X Services (V16.2.0, Release 16), 3GPP Standard TS 23.285, Dec. 2019.
[51] Architecture Enhancements for 5G System (5GS) to Support Vehicle-toEverything (V2X) Services (V16.2.0, Release 16), 3GPP Standard TS 23.287, Mar. 2020

我们以查找[14] “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Study on LTE-based V2X Services,” 3GPP TR 36.885 V14.0.0, Release 14, Jun. 2016.为例，
点击36series
进入界面可以直接搜索，然后点击小眼镜打开

一个series代表一个研究方面

而release是不断更新的协议版本，具有时效性。
同一个series下可能会有不同时期的release，便代表不同时期的版本

4.然后就可点击找到的协议，弹出小窗口可能会有很多版本，点击需要的版本即可下载

5.然后就可以看到自己下载的文件了

在这份文件里面，作为结论部分，就有信道模型的参数设置，而这就是被论文里面引用参考去作为仿真参数的来源

上图表示
L. Liang, H. Ye and G. Y. Li, “Spectrum Sharing in Vehicular Networks Based on Multi-Agent Reinforcement Learning,” in IEEE Journal on Selected Areas in Communications, vol. 37, no. 10, pp. 2282-2292, Oct. 2019, doi: 10.1109/JSAC.2019.2933962.
参考
Technical Specification Group Radio Access Network; Study LTE-Based V2X Services; (Release 14), document 3GPP TR 36.885 V14.0.0, 3rd Generation Partnership Project, Jun. 2016.
这个3GPP协议参数的实例