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🌏目录

1 Ubuntu20.04 LTS系统安装
- 1.1 ISO镜像下载
- 1.2 U盘格式化
- 1.3 系统安装
- 1.4 更新软件源
- 1.5 *可选操作
- - 1.5.1 静态IP配置
  - 1.5.2 安装独立显卡驱动
  - 1.5.3 系统UI美化
2 NI USRP2954连接配置
- 2.1 SDR介绍
- 2.2 NI USRP & Ettus USRP
- 2.3 UHD(USRP Hardware Drivers)源码编译安装
- 2.4 UHD与X310的通信
- - 2.4.1 USB2.0 & 千兆以太网 & USB3.0
  - 2.4.2 PCIe通信配置
  - 2.4.3 1Gbps网口通信配置
- 2.5 USRP设备命名
- 2.6 更改USRP设备IP地址
3 srsRAN环境配置
- 3.1 srsRAN源码编译安装
- 3.2 srsGUI源码编译安装
- 3.3 低时延内核安装
4 srsue & srsepc & srsenb ==pending==
- 4.1 UE（srsue）
- - 4.1.1 前置操作
  - 4.1.2 UE参数配置
  - 4.1.3 高级用法
- 4.2 EPC（srsepc）
- 4.3 eNB（srsenb）
5 srsRAN+USRP应用举例
- 5.1 NB-IoT信号检测
- 5.2 4G端到端系统
- 5.3 基站小区切换 ==IMPORTANT==
- - 5.3.1 Intra-eNB
  - 5.3.2 Inter-eNB

1 Ubuntu20.04 LTS系统安装

第一步先安装ubuntu，且因涉及时令准确度等因素，不采用虚拟机的方案，可以采用单系统或双系统的ubuntu。自己选择的是单系统方案

1.1 ISO镜像下载

ubuntu20.04 LTE下载：Download Ubuntu Desktop

1.2 U盘格式化

准备一个4G以上的空U盘（即使内部有数据也将在后续被格式化清空）
傻瓜式下载UltalISO 软碟通，安装完成后启用软碟通，选择试用
进入软碟通主界面后点击文件，在光盘目录下选择下载好的ISO镜像，在本地目录选择所插入的U盘，选择启动下的写入硬盘映像，默认配置，点击写入

1.3 系统安装

【重启电脑之前，可以先在windows系统下按win+R，敲入cmd进入命令行模式，执行ipconfig记录好IPv4地址、掩码、默认网关，执行nslookup记录好DNS地址，后续可能需要配置静态IP】

重启电脑，选择u盘启动（操作百度下即可）
选择安装ubuntu
下一页面选择正常安装，其它选项可以不勾选
下一页面选择清楚整个磁盘并安装ubuntu
下一页面涉及时区设置，根据自己所在的地域选择即可，并不重要，可以直接继续
后续页面傻瓜式操作即可完成安装
【若想安装双系统，可见Windows10安装ubuntu18.04双系统教程】

1.4 更新软件源

按win键打开搜索，找到软件和更新，修改下载服务器，可以选择阿里云、华为云等源，也可以点击选择最佳服务器进行匹配，但速度稍慢
完成后按Ctrl+Alt+T进入终端，执行如下命令：

sudo apt-get update && sudo apt-get upgrade

1.5 *可选操作

1.5.1 静态IP配置

在安装ubuntu系统之后，更新软件源之前，如果插入网线也没有网络，可能需要先进行静态IP的配置。进入设置选择网络，点击有线的小齿轮进行IPv4的手动配置，将步骤1.3中所记录的4个IP地址输入即可

1.5.2 安装独立显卡驱动

由于ubuntu系统安装时默认安装了N卡驱动，可能与自己的显卡不适配，安装适配的独立显卡驱动可以提高界面操作的流畅性。具体命令如下：

sudo ubuntu-drivers autoinstall  #自动安装

1.5.3 系统UI美化

可参考Ubuntu20.04修改MAC风格

2 NI USRP2954连接配置

2.1 SDR介绍

SDR系统及其分类

2.2 NI USRP & Ettus USRP

USRP的两大厂商分别为NI和Ettus，但2010年Ettus已被NI收购（Ettus作为NI的子品牌），因此可以说现在的USRP都是NI产的，Ettus与NI的内部母板硬件一致
在这里插入图片描述
以我手头上的NI USRP2954型号为例，其实就只是在Ettus Research X310型号的硬件基础上（内部具备X310母板），添加了两块UBX子板和GPSDO模块，然后将外壳的名字改为NI USRP2954而已

2.3 UHD(USRP Hardware Drivers)源码编译安装

安装git和vim

sudo apt-get install git
sudo apt-get install vim      #后续可以用来编辑c/c++代码文件
sudo apt-get install g++      #后续可以用来编译c/c++代码文件，从而生成可执行文件

安装依赖

sudo apt-get install libboost-all-dev libusb-1.0-0-dev doxygen python3-docutils python3-mako python3-numpy python3-requests python3-ruamel.yaml python3-setuptools cmake build-essential

【linux终端下的复制粘贴快捷键为Crtl+Shift+c、Crtl+Shift+v】

从github拉取uhd代码

cd /home  #等价于:cd / && cd home
mkdir workarea-uhd
cd workarea-uhd
git clone https://github.com/EttusResearch/uhd

编译

cd uhd
git tag -l                  #获取发行版本的完整列表
git checkout v3.15.0.0      #切换到合适版本，这里选择3.15_LTS.
cd host 
mkdir build      
cd build
cmkae ../                   #交叉编译上层文件夹host
make -j8                    #编译源码，-j8表示8个处理器加速处理
make test
sudo make install
sudo ldconfig               #更新动态链接库

UHD FPGA镜像下载

sudo uhd_images_downloader

2.4 UHD与X310的通信

B系列与UHD通信的方式仅有USB3.0一种，而X系列与UHD通信的方式有两种：网线传输、PCIe线缆高速传输，其中网线传输方案还分1Gbps和10Gbps两种
在这里插入图片描述

对于PCIe高速传输方案，要求电脑主机要有PCIe接口，因此需要额外购买针对电脑主机的PCIe套件，我所用的是NI1092机箱（其实就是一台电脑主机），型号1092，PXI控制器型号8861

但需要注意的是，PXI机箱的PCIe套件（上图的NI-PXIe 8374板子）无法装在电脑主机上，电脑主机的PCIe套件需另外购买。电脑主机的PCIe套件安装可参考USRP2954硬件安装。考虑到1Gbps的速率其实已经能够满足大多数应用，因此一般来讲UHD和USRP之间的通信通过1Gbps的网口连接来实现

2.4.1 USB2.0 & 千兆以太网 & USB3.0

USB2.0将设备之间的理论最高速率增加至480Mbps，即60MB/s
千兆以太网1000Mbps，即1Gbps，一般家庭用线为超五类网线和六类网线
USB3.0理论速率可达5Gbps，毕竟是短距离传输，因此快于千兆网
【关于USB接口的更多信息可见：USB接口种类汇总】

2.4.2 PCIe通信配置

【参考自：USRP Hardware Driver and USRP Manual——NI RIO Kernel Modules for X-Series PCIe Connectivity(Version: 4.1.0.0-231-g5f5bb7921)】

下载NI Linux设备驱动程序并提取至主目录中
进入改文件夹后将对应的deb后缀的文件复制到主目录中
Ctrl+Alt+T打开终端并执行以下命令

安装存储库deb

dpkg -i ni-ubuntu2004firstlook-drivers-2021Q4.deb

更新包信息

sudo apt update

安装内核头

sudo apt install linux-headers-$(uname -r)

安装ni-usrp-rio

sudo apt install ni-usrp-rio

通过DKMS创建内核模块

dkms autoinstall

关机

poweroff

PCIe通信测试

由于PCIe接口不允许热插拔，因此需要先将PCIe线缆连接好后，将USRP开机，再启动电脑主机，随后打开终端执行以下命令

uhd_find_devices  #查找usrp硬件设备

在这里插入图片描述 resource:RIO0是USRP RIO设备通过PCI Express传输的唯一标识符，即表明此时USRP与UHD之间的通信通过PCIe线缆传输，而非网口。若提示Input stream error，则执行reboot重启电脑，再重新执行uhd_find_devices

uhd_usrp_probe    #查看usrp设备信息

设备信息如下

[INFO] [UHD] linux; GNU C++ version 9.3.0; Boost_107100; UHD_3.15.0.HEAD-0-gaea0e2de
[INFO] [X300] X300 initialization sequence...
[INFO] [X300] Connecting to niusrpriorpc at localhost:5444...
[INFO] [X300] Using LVBITX bitfile /usr/local/share/uhd/images/usrp_x310_fpga_HG.lvbitx
[INFO] [X300] Radio 1x clock: 200 MHz
[INFO] [GPS] Found an internal GPSDO: LC_XO, Firmware Rev 0.929b
[INFO] [0/DmaFIFO_0] Initializing block control (NOC ID: 0xF1F0D00000000000)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1303 MB/s)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1320 MB/s)
[INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DDC_1] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DUC_0] Initializing block control (NOC ID: 0xD0C0000000000000)
[INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000000)_____________________________________________________/
|       Device: X-Series Device
|     _____________________________________________________
|    /
|   |       Mboard: X310
|   |   revision: 11
|   |   revision_compat: 7
|   |   product: 30810
|   |   mac-addr0: 00:80:2f:31:9c:59
|   |   mac-addr1: 00:80:2f:31:9c:5a
|   |   gateway: 192.168.10.1
|   |   ip-addr0: 192.168.10.2
|   |   subnet0: 255.255.255.0
|   |   ip-addr1: 192.168.20.2
|   |   subnet1: 255.255.255.0
|   |   ip-addr2: 192.168.30.2
|   |   subnet2: 255.255.255.0
|   |   ip-addr3: 192.168.40.2
|   |   subnet3: 255.255.255.0
|   |   serial: 31F9358
|   |   name: UE_USRP         #name一般为空，但由于我的usrp被我命名过，所以此处显示UE——USRP，下面有修改usrp设备的教程
|   |   FW Version: 6.0
|   |   FPGA Version: 36.0
|   |   FPGA git hash: fde2a94
|   |   RFNoC capable: Yes
|   |   
|   |   Time sources:  internal, external, gpsdo
|   |   Clock sources: internal, external, gpsdo
|   |   Sensors: gps_gpgga, gps_gprmc, gps_time, gps_locked, gps_servo, ref_locked
|   |     _____________________________________________________
|   |    /
|   |   |       RX Dboard: A
|   |   |   ID: UBX-160 v1 (0x007a)
|   |   |   Serial: 31F5AE9
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: 0
|   |   |   |   Name: UBX RX
|   |   |   |   Antennas: TX/RX, RX2, CAL
|   |   |   |   Sensors: lo_locked
|   |   |   |   Freq range: 10.000 to 6000.000 MHz
|   |   |   |   Gain range PGA0: 0.0 to 31.5 step 0.5 dB
|   |   |   |   Bandwidth range: 160000000.0 to 160000000.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Codec: A
|   |   |   |   Name: ads62p48
|   |   |   |   Gain range digital: 0.0 to 6.0 step 0.5 dB
|   |     _____________________________________________________
|   |    /
|   |   |       RX Dboard: B
|   |   |   ID: UBX-160 v1 (0x007a)
|   |   |   Serial: 31F5AEE
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: 0
|   |   |   |   Name: UBX RX
|   |   |   |   Antennas: TX/RX, RX2, CAL
|   |   |   |   Sensors: lo_locked
|   |   |   |   Freq range: 10.000 to 6000.000 MHz
|   |   |   |   Gain range PGA0: 0.0 to 31.5 step 0.5 dB
|   |   |   |   Bandwidth range: 160000000.0 to 160000000.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Codec: B
|   |   |   |   Name: ads62p48
|   |   |   |   Gain range digital: 0.0 to 6.0 step 0.5 dB
|   |     _____________________________________________________
|   |    /
|   |   |       TX Dboard: A
|   |   |   ID: UBX-160 v1 (0x0079)
|   |   |   Serial: 31F5AE9
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Frontend: 0
|   |   |   |   Name: UBX TX
|   |   |   |   Antennas: TX/RX, CAL
|   |   |   |   Sensors: lo_locked
|   |   |   |   Freq range: 10.000 to 6000.000 MHz
|   |   |   |   Gain range PGA0: 0.0 to 31.5 step 0.5 dB
|   |   |   |   Bandwidth range: 160000000.0 to 160000000.0 step 0.0 Hz
|   |   |   |   Connection Type: QI
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Codec: A
|   |   |   |   Name: ad9146
|   |   |   |   Gain Elements: None
|   |     _____________________________________________________
|   |    /
|   |   |       TX Dboard: B
|   |   |   ID: UBX-160 v1 (0x0079)
|   |   |   Serial: 31F5AEE
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Frontend: 0
|   |   |   |   Name: UBX TX
|   |   |   |   Antennas: TX/RX, CAL
|   |   |   |   Sensors: lo_locked
|   |   |   |   Freq range: 10.000 to 6000.000 MHz
|   |   |   |   Gain range PGA0: 0.0 to 31.5 step 0.5 dB
|   |   |   |   Bandwidth range: 160000000.0 to 160000000.0 step 0.0 Hz
|   |   |   |   Connection Type: QI
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Codec: B
|   |   |   |   Name: ad9146
|   |   |   |   Gain Elements: None
|   |     _____________________________________________________
|   |    /
|   |   |       RFNoC blocks on this device:
|   |   |   
|   |   |   * DmaFIFO_0
|   |   |   * Radio_0
|   |   |   * Radio_1
|   |   |   * DDC_0
|   |   |   * DDC_1
|   |   |   * DUC_0
|   |   |   * DUC_1

连接成功后，将相应的镜像烧写进手头的usrp

cd /usr/local/bin
./uhd_image_loader --args="type=x300,serial=31F9358"  #将x300对应的镜像烧写进serial为31F9358的usrp设备

重启USRP以生效
此后若想关闭或者打开UHD与USRP的PCIe通信，可执行以下命令

systemctl stop niusrpriorpc.service   #停用ni usrp设备驱动程序

systemctl start niusrpriorpc.service  #开启ni usrp设备驱动程序

2.4.3 1Gbps网口通信配置

此种通信配置需要SFP转RJ45光模块，一般购买USRP时可在附件中增选，若没有，可以在某宝平台购买。将该光模块插入端口0中，便可以用网线连接电脑和USRP
在这里插入图片描述随后打开有线网络配置，USRP 1Gbps端口0的默认IP地址为192.168.10.2，因此电脑的IP地址需进行静态配置到统一网段。可配置如下

在终端执行ping 192.168.10.2，网络可达
查找usrp硬件设备并查看usrp设备信息

uhd_find_devices  #查找usrp硬件设备

在这里插入图片描述

uhd_usrp_probe    #查看usrp设备信息

需要注意的是，如果此前用过PCIe连接，现在改用网口连接，会有Error出现，提示input stream error，这是因为没有将ni usrp设备驱动程序停用或卸载，UHD会优先通过PCIe接口去找usrp设备。只有当ni usrp设备驱动程序被停用或卸载后，UHD才会通过网口去找usrp设备

systemctl stop niusrpriorpc.service  #停用ni usrp设备驱动程序

apt remove ni-usrp-rio  
apt autoremove                      #卸载ni usrp设备驱动程序

最后，和此前通过PCIe连接一样，通过网口连接成功后，将相应的镜像烧写进手头的usrp

cd /usr/local/bin
./uhd_image_loader --args="type=x300,serial=31F9358"  #将x300对应的镜像烧写进serial为31F9358的usrp设备

重启USRP以生效

2.5 USRP设备命名

如果一台电脑连接了多台USRP，那么为方便起见，可以考虑给USRP设备分配自定义名称，这样以后可以通过名称而不是难以记住的序列号或IP地址来识别USRP设备
在这里插入图片描述

通过序列号来找到主机所连接的某个具体的USRP设备

uhd_find_devices --args="serial=31F9358"  #该序列号从之前的步骤中获取

在这里插入图片描述

对序列号为31F9358的USRP设备命名，重置name属性

cd /home/workarea-uhd/uhd/host/utils
g++ usrp_burn_mb_eeprom.cpp -o usrp_burm_mb_eeprom   #先通过g++ -o命令编译生成可执行文件usrp_burn_mb_eeprom

可能会发现有以下报错：undefined reference to，即未定义引用
在这里插入图片描述
这是因此使用g++编译c/c++项目文件时，没有链接上所需的动态库，参考博文【错误】undefined reference to `boost::……`的解决后修改编译命令如下

g++ usrp_burn_mb_eeprom.cpp -o usrp_burn_mb_eeprom -l boost_program_options -l uhd  #对于c++文件用g++，对于c文件用gcc

成功生成可执行文件如下
在这里插入图片描述

按以下命令启用上面所生成的可执行文件，重置序列号为31F9358的USRP的名称为UE_USRP

./usrp_burn_mb_eeprom --args="serial=31F9358" --value="name=UE_USRP"    #将设备命名为UE_USRP

最后重启电脑即可生效

通过设备的自定义名称来查找到该设备

uhd_find_devices --args="name=UE_USRP"

在这里插入图片描述

2.6 更改USRP设备IP地址

出于一些应用需求，我们可能需要更改USRP设备的IP地址，一般USRP设备ip-addr0属性默认为192.168.10.2，更改操作类似步骤2.5
在这里插入图片描述

#前面的命令均一样
./usrp_burn_mb_eeprom --args="serial=31F9358" --value="ip-addr0=192.168.10.11"    #将usrp的ip地址更改为192.168.10.11

在这里插入图片描述

重启电脑即可生效

3 srsRAN环境配置

3.1 srsRAN源码编译安装

打开终端，执行以下命令（若遇权限问题加sudo）

sudo apt-get install build-essential cmake libfftw3-dev libmbedtls-dev libboost-program-options-dev libconfig++-dev libsctp-dev
git clone https://github.com/srsRAN/srsRAN.git
cd srsRAN
mkdir build
cd build
cmake ../  #交叉编译上层目录
make -j8   #多核（8处理器）加速处理
make test  #功能测试，可不执行
sudo make install  
ldconfig   #更新动态链接库
sudo srsran_install_configs.sh user

3.2 srsGUI源码编译安装

sudo apt-get install libboost-system-dev libboost-test-dev libboost-thread-dev libqwt-qt5-dev qtbase5-dev
sudo git clone https://github.com/srsLTE/srsGUI.git
cd srsGUI
mkdir build
cd build
cmake ../
make -j8
make test
sudo make install
ldconfig

3.3 低时延内核安装

sudo apt-get install linux-lowlatency
sudo apt-get install linux-image-`uname -r | cut -d- -f1-2`-lowlatency
sudo apt-get install linux-headers-`uname -r | cut -d- -f1-2`-lowlatency
reboot

4 srsue & srsepc & srsenb pending

4.1 UE（srsue）

4.1.1 前置操作

操作系统设置
srsue使用标准linux内核在用户空间中运行，为了获得最佳性能，可以禁用CPU频率缩放，执行以下命令

for f in /sys/devices/system/cpu/cpu[0-9]*/cpufreq/scaling_governor ; doecho performance > $f
done

参数配置
USRP前端设置
为了减少TX-RX串扰，可以将TX和RX天线互成90度，也可以通过SMA-SMA连接线（某宝搜）实现有线连接，对于USRP等射频前端，将TX直接连接到RX时要确保至少有30dB的衰减，避免损坏USRP设备，这种衰减器某宝也有，我用的是下面这种固定衰减器

有关有线连接的更多详细信息，见下面4.1.3 高级用法
结果观察

4.1.2 UE参数配置

4.1.3 高级用法

4.2 EPC（srsepc）

4.3 eNB（srsenb）

5 srsRAN+USRP应用举例

以下示例都可以在 ./srsRAN/build/lib/examples目录中找到
在这里插入图片描述

5.1 NB-IoT信号检测

本实验例子旨在发现并解码当地的商用NB-IoT传输，基本实验硬件如下图所示
在这里插入图片描述其中，Machine1为自己的电脑，RF-FRONTEN在这里表示USRP设备，接下来我们用cell_search_nbiot来搜索本地区域内的窄带物联网基站，并用npdsch_ue来解码该基站的下行数据。需要注意的是：国内的NB-IoT主要运行在B5和B8频段
在这里插入图片描述

通过cell_search_nbiot搜索基站

cd srsRAN/build/lib/examples
./cell_search_nbiot -b 5  #选用B5

搜索结果如下

Opening RF device...
Available RF device list: UHD 
Trying to open RF device 'UHD'
[INFO] [UHD] linux; GNU C++ version 9.3.0; Boost_107100; UHD_3.15.0.HEAD-0-gaea0e2de
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Opening USRP channels=1, args: type=x300,master_clock_rate=184.32e6
[INFO] [UHD RF] RF UHD Generic instance constructed
[INFO] [X300] X300 initialization sequence...
[INFO] [X300] Connecting to niusrpriorpc at localhost:5444...
[INFO] [X300] Using LVBITX bitfile /usr/local/share/uhd/images/usrp_x310_fpga_HG.lvbitx
[INFO] [X300] Radio 1x clock: 184.32 MHz
[INFO] [GPS] Found an internal GPSDO: LC_XO, Firmware Rev 0.929b
[INFO] [0/DmaFIFO_0] Initializing block control (NOC ID: 0xF1F0D00000000000)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1310 MB/s)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1306 MB/s)
[INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DDC_1] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DUC_0] Initializing block control (NOC ID: 0xD0C0000000000000)
[INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000000)
RF device 'UHD' successfully opened
[  0/249]: EARFCN 2400, 869.00 MHz looking for NPSS.
[  1/249]: EARFCN 2401, 869.10 MHz looking for NPSS.
[  2/249]: EARFCN 2402, 869.20 MHz looking for NPSS.
[  3/249]: EARFCN 2403, 869.30 MHz looking for NPSS.
[  4/249]: EARFCN 2404, 869.40 MHz looking for NPSS.
[  5/249]: EARFCN 2405, 869.50 MHz looking for NPSS.
[  6/249]: EARFCN 2406, 869.60 MHz looking for NPSS.
[  7/249]: EARFCN 2407, 869.70 MHz looking for NPSS.
[  8/249]: EARFCN 2408, 869.80 MHz looking for NPSS.
[  9/249]: EARFCN 2409, 869.90 MHz looking for NPSS.
[ 10/249]: EARFCN 2410, 870.00 MHz looking for NPSS.
[ 11/249]: EARFCN 2411, 870.10 MHz looking for NPSS.
[ 12/249]: EARFCN 2412, 870.20 MHz looking for NPSS.
[ 13/249]: EARFCN 2413, 870.30 MHz looking for NPSS.
[ 14/249]: EARFCN 2414, 870.40 MHz looking for NPSS.
[ 15/249]: EARFCN 2415, 870.50 MHz looking for NPSS.
[ 16/249]: EARFCN 2416, 870.60 MHz looking for NPSS.
[ 17/249]: EARFCN 2417, 870.70 MHz looking for NPSS.
[ 18/249]: EARFCN 2418, 870.80 MHz looking for NPSS.
[ 19/249]: EARFCN 2419, 870.90 MHz looking for NPSS.
[ 20/249]: EARFCN 2420, 871.00 MHz looking for NPSS.
[ 21/249]: EARFCN 2421, 871.10 MHz looking for NPSS.
[ 22/249]: EARFCN 2422, 871.20 MHz looking for NPSS.
[ 23/249]: EARFCN 2423, 871.30 MHz looking for NPSS.
[ 24/249]: EARFCN 2424, 871.40 MHz looking for NPSS.
[ 25/249]: EARFCN 2425, 871.50 MHz looking for NPSS.
[ 26/249]: EARFCN 2426, 871.60 MHz looking for NPSS.
[ 27/249]: EARFCN 2427, 871.70 MHz looking for NPSS.
[ 28/249]: EARFCN 2428, 871.80 MHz looking for NPSS.
[ 29/249]: EARFCN 2429, 871.90 MHz looking for NPSS.
[ 30/249]: EARFCN 2430, 872.00 MHz looking for NPSS.
[ 31/249]: EARFCN 2431, 872.10 MHz looking for NPSS.
[ 32/249]: EARFCN 2432, 872.20 MHz looking for NPSS.
[ 33/249]: EARFCN 2433, 872.30 MHz looking for NPSS.
[ 34/249]: EARFCN 2434, 872.40 MHz looking for NPSS.
[ 35/249]: EARFCN 2435, 872.50 MHz looking for NPSS.
[ 36/249]: EARFCN 2436, 872.60 MHz looking for NPSS.
[ 37/249]: EARFCN 2437, 872.70 MHz looking for NPSS.
[ 38/249]: EARFCN 2438, 872.80 MHz looking for NPSS.
[ 39/249]: EARFCN 2439, 872.90 MHz looking for NPSS.
[ 40/249]: EARFCN 2440, 873.00 MHz looking for NPSS.
[ 41/249]: EARFCN 2441, 873.10 MHz looking for NPSS.
[ 42/249]: EARFCN 2442, 873.20 MHz looking for NPSS.
[ 43/249]: EARFCN 2443, 873.30 MHz looking for NPSS.
[ 44/249]: EARFCN 2444, 873.40 MHz looking for NPSS.
[ 45/249]: EARFCN 2445, 873.50 MHz looking for NPSS.
[ 46/249]: EARFCN 2446, 873.60 MHz looking for NPSS.
[ 47/249]: EARFCN 2447, 873.70 MHz looking for NPSS.
[ 48/249]: EARFCN 2448, 873.80 MHz looking for NPSS.
[ 49/249]: EARFCN 2449, 873.90 MHz looking for NPSS.
[ 50/249]: EARFCN 2450, 874.00 MHz looking for NPSS.
[ 51/249]: EARFCN 2451, 874.10 MHz looking for NPSS.
[ 52/249]: EARFCN 2452, 874.20 MHz looking for NPSS.
[ 53/249]: EARFCN 2453, 874.30 MHz looking for NPSS.
[ 54/249]: EARFCN 2454, 874.40 MHz looking for NPSS.
[ 55/249]: EARFCN 2455, 874.50 MHz looking for NPSS.
[ 56/249]: EARFCN 2456, 874.60 MHz looking for NPSS.
[ 57/249]: EARFCN 2457, 874.70 MHz looking for NPSS.
[ 58/249]: EARFCN 2458, 874.80 MHz looking for NPSS.
[ 59/249]: EARFCN 2459, 874.90 MHz looking for NPSS.
[ 60/249]: EARFCN 2460, 875.00 MHz looking for NPSS.
[ 61/249]: EARFCN 2461, 875.10 MHz looking for NPSS.
[ 62/249]: EARFCN 2462, 875.20 MHz looking for NPSS.
[ 63/249]: EARFCN 2463, 875.30 MHz looking for NPSS.
[ 64/249]: EARFCN 2464, 875.40 MHz looking for NPSS.
[ 65/249]: EARFCN 2465, 875.50 MHz looking for NPSS.
[ 66/249]: EARFCN 2466, 875.60 MHz looking for NPSS.
[ 67/249]: EARFCN 2467, 875.70 MHz looking for NPSS.
[ 68/249]: EARFCN 2468, 875.80 MHz looking for NPSS.
[ 69/249]: EARFCN 2469, 875.90 MHz looking for NPSS.
[ 70/249]: EARFCN 2470, 876.00 MHz looking for NPSS.
[ 71/249]: EARFCN 2471, 876.10 MHz looking for NPSS.
[ 72/249]: EARFCN 2472, 876.20 MHz looking for NPSS.
[ 73/249]: EARFCN 2473, 876.30 MHz looking for NPSS.
[ 74/249]: EARFCN 2474, 876.40 MHz looking for NPSS.
[ 75/249]: EARFCN 2475, 876.50 MHz looking for NPSS.
[ 76/249]: EARFCN 2476, 876.60 MHz looking for NPSS.
[ 77/249]: EARFCN 2477, 876.70 MHz looking for NPSS.
[ 78/249]: EARFCN 2478, 876.80 MHz looking for NPSS.
[ 79/249]: EARFCN 2479, 876.90 MHz looking for NPSS.
[ 80/249]: EARFCN 2480, 877.00 MHz looking for NPSS.
[ 81/249]: EARFCN 2481, 877.10 MHz looking for NPSS.
[ 82/249]: EARFCN 2482, 877.20 MHz looking for NPSS.
[ 83/249]: EARFCN 2483, 877.30 MHz looking for NPSS.
[ 84/249]: EARFCN 2484, 877.40 MHz looking for NPSS.
[ 85/249]: EARFCN 2485, 877.50 MHz looking for NPSS.
[ 86/249]: EARFCN 2486, 877.60 MHz looking for NPSS.
[ 87/249]: EARFCN 2487, 877.70 MHz looking for NPSS.
[ 88/249]: EARFCN 2488, 877.80 MHz looking for NPSS.
[ 89/249]: EARFCN 2489, 877.90 MHz looking for NPSS.
[ 90/249]: EARFCN 2490, 878.00 MHz looking for NPSS.
[ 91/249]: EARFCN 2491, 878.10 MHz looking for NPSS.
[ 92/249]: EARFCN 2492, 878.20 MHz looking for NPSS.
[ 93/249]: EARFCN 2493, 878.30 MHz looking for NPSS.
[ 94/249]: EARFCN 2494, 878.40 MHz looking for NPSS.
[ 95/249]: EARFCN 2495, 878.50 MHz looking for NPSS.
[ 96/249]: EARFCN 2496, 878.60 MHz looking for NPSS.
[ 97/249]: EARFCN 2497, 878.70 MHz looking for NPSS.
[ 98/249]: EARFCN 2498, 878.80 MHz looking for NPSS.
[ 99/249]: EARFCN 2499, 878.90 MHz looking for NPSS.
[100/249]: EARFCN 2500, 879.00 MHz looking for NPSS.
[101/249]: EARFCN 2501, 879.10 MHz looking for NPSS.
[102/249]: EARFCN 2502, 879.20 MHz looking for NPSS.
[103/249]: EARFCN 2503, 879.30 MHz looking for NPSS.
[104/249]: EARFCN 2504, 879.40 MHz looking for NPSS.
[105/249]: EARFCN 2505, 879.50 MHz looking for NPSS.
NSSS with peak=3.109345, cell-id: 121, partial SFN: 0
Found CELL ID 121.
[106/249]: EARFCN 2506, 879.60 MHz looking for NPSS.
NSSS with peak=4.332994, cell-id: 82, partial SFN: 0
Found CELL ID 82.
[107/249]: EARFCN 2507, 879.70 MHz looking for NPSS.
NSSS with peak=3.191105, cell-id: 407, partial SFN: 0
Found CELL ID 407.
[108/249]: EARFCN 2508, 879.80 MHz looking for NPSS.
[109/249]: EARFCN 2509, 879.90 MHz looking for NPSS.
NSSS with peak=6.628917, cell-id: 44, partial SFN: 0
Found CELL ID 44.
[110/249]: EARFCN 2510, 880.00 MHz looking for NPSS.
[111/249]: EARFCN 2511, 880.10 MHz looking for NPSS.
[112/249]: EARFCN 2512, 880.20 MHz looking for NPSS.
[113/249]: EARFCN 2513, 880.30 MHz looking for NPSS.
[114/249]: EARFCN 2514, 880.40 MHz looking for NPSS.
[115/249]: EARFCN 2515, 880.50 MHz looking for NPSS.
[116/249]: EARFCN 2516, 880.60 MHz looking for NPSS.
[117/249]: EARFCN 2517, 880.70 MHz looking for NPSS.
[118/249]: EARFCN 2518, 880.80 MHz looking for NPSS.
[119/249]: EARFCN 2519, 880.90 MHz looking for NPSS.
[120/249]: EARFCN 2520, 881.00 MHz looking for NPSS.
[121/249]: EARFCN 2521, 881.10 MHz looking for NPSS.
[122/249]: EARFCN 2522, 881.20 MHz looking for NPSS.
[123/249]: EARFCN 2523, 881.30 MHz looking for NPSS.
[124/249]: EARFCN 2524, 881.40 MHz looking for NPSS.
[125/249]: EARFCN 2525, 881.50 MHz looking for NPSS.
[126/249]: EARFCN 2526, 881.60 MHz looking for NPSS.
[127/249]: EARFCN 2527, 881.70 MHz looking for NPSS.
[128/249]: EARFCN 2528, 881.80 MHz looking for NPSS.
[129/249]: EARFCN 2529, 881.90 MHz looking for NPSS.
[130/249]: EARFCN 2530, 882.00 MHz looking for NPSS.
[131/249]: EARFCN 2531, 882.10 MHz looking for NPSS.
[132/249]: EARFCN 2532, 882.20 MHz looking for NPSS.
[133/249]: EARFCN 2533, 882.30 MHz looking for NPSS.
[134/249]: EARFCN 2534, 882.40 MHz looking for NPSS.
[135/249]: EARFCN 2535, 882.50 MHz looking for NPSS.
[136/249]: EARFCN 2536, 882.60 MHz looking for NPSS.
[137/249]: EARFCN 2537, 882.70 MHz looking for NPSS.
[138/249]: EARFCN 2538, 882.80 MHz looking for NPSS.
[139/249]: EARFCN 2539, 882.90 MHz looking for NPSS.
[140/249]: EARFCN 2540, 883.00 MHz looking for NPSS.
[141/249]: EARFCN 2541, 883.10 MHz looking for NPSS.
[142/249]: EARFCN 2542, 883.20 MHz looking for NPSS.
[143/249]: EARFCN 2543, 883.30 MHz looking for NPSS.
[144/249]: EARFCN 2544, 883.40 MHz looking for NPSS.
[145/249]: EARFCN 2545, 883.50 MHz looking for NPSS.
[146/249]: EARFCN 2546, 883.60 MHz looking for NPSS.
[147/249]: EARFCN 2547, 883.70 MHz looking for NPSS.
[148/249]: EARFCN 2548, 883.80 MHz looking for NPSS.
[149/249]: EARFCN 2549, 883.90 MHz looking for NPSS.
[150/249]: EARFCN 2550, 884.00 MHz looking for NPSS.
[151/249]: EARFCN 2551, 884.10 MHz looking for NPSS.
[152/249]: EARFCN 2552, 884.20 MHz looking for NPSS.
[153/249]: EARFCN 2553, 884.30 MHz looking for NPSS.
[154/249]: EARFCN 2554, 884.40 MHz looking for NPSS.
[155/249]: EARFCN 2555, 884.50 MHz looking for NPSS.
[156/249]: EARFCN 2556, 884.60 MHz looking for NPSS.
[157/249]: EARFCN 2557, 884.70 MHz looking for NPSS.
[158/249]: EARFCN 2558, 884.80 MHz looking for NPSS.
[159/249]: EARFCN 2559, 884.90 MHz looking for NPSS.
[160/249]: EARFCN 2560, 885.00 MHz looking for NPSS.
[161/249]: EARFCN 2561, 885.10 MHz looking for NPSS.
[162/249]: EARFCN 2562, 885.20 MHz looking for NPSS.
[163/249]: EARFCN 2563, 885.30 MHz looking for NPSS.
[164/249]: EARFCN 2564, 885.40 MHz looking for NPSS.
[165/249]: EARFCN 2565, 885.50 MHz looking for NPSS.
[166/249]: EARFCN 2566, 885.60 MHz looking for NPSS.
[167/249]: EARFCN 2567, 885.70 MHz looking for NPSS.
[168/249]: EARFCN 2568, 885.80 MHz looking for NPSS.
[169/249]: EARFCN 2569, 885.90 MHz looking for NPSS.
[170/249]: EARFCN 2570, 886.00 MHz looking for NPSS.
[171/249]: EARFCN 2571, 886.10 MHz looking for NPSS.
[172/249]: EARFCN 2572, 886.20 MHz looking for NPSS.
[173/249]: EARFCN 2573, 886.30 MHz looking for NPSS.
[174/249]: EARFCN 2574, 886.40 MHz looking for NPSS.
[175/249]: EARFCN 2575, 886.50 MHz looking for NPSS.
[176/249]: EARFCN 2576, 886.60 MHz looking for NPSS.
[177/249]: EARFCN 2577, 886.70 MHz looking for NPSS.
[178/249]: EARFCN 2578, 886.80 MHz looking for NPSS.
[179/249]: EARFCN 2579, 886.90 MHz looking for NPSS.
[180/249]: EARFCN 2580, 887.00 MHz looking for NPSS.
[181/249]: EARFCN 2581, 887.10 MHz looking for NPSS.
[182/249]: EARFCN 2582, 887.20 MHz looking for NPSS.
[183/249]: EARFCN 2583, 887.30 MHz looking for NPSS.
[184/249]: EARFCN 2584, 887.40 MHz looking for NPSS.
[185/249]: EARFCN 2585, 887.50 MHz looking for NPSS.
[186/249]: EARFCN 2586, 887.60 MHz looking for NPSS.
[187/249]: EARFCN 2587, 887.70 MHz looking for NPSS.
[188/249]: EARFCN 2588, 887.80 MHz looking for NPSS.
[189/249]: EARFCN 2589, 887.90 MHz looking for NPSS.
[190/249]: EARFCN 2590, 888.00 MHz looking for NPSS.
[191/249]: EARFCN 2591, 888.10 MHz looking for NPSS.
[192/249]: EARFCN 2592, 888.20 MHz looking for NPSS.
[193/249]: EARFCN 2593, 888.30 MHz looking for NPSS.
[194/249]: EARFCN 2594, 888.40 MHz looking for NPSS.
[195/249]: EARFCN 2595, 888.50 MHz looking for NPSS.
[196/249]: EARFCN 2596, 888.60 MHz looking for NPSS.
[197/249]: EARFCN 2597, 888.70 MHz looking for NPSS.
[198/249]: EARFCN 2598, 888.80 MHz looking for NPSS.
[199/249]: EARFCN 2599, 888.90 MHz looking for NPSS.
[200/249]: EARFCN 2600, 889.00 MHz looking for NPSS.
[201/249]: EARFCN 2601, 889.10 MHz looking for NPSS.
[202/249]: EARFCN 2602, 889.20 MHz looking for NPSS.
[203/249]: EARFCN 2603, 889.30 MHz looking for NPSS.
[204/249]: EARFCN 2604, 889.40 MHz looking for NPSS.
[205/249]: EARFCN 2605, 889.50 MHz looking for NPSS.
[206/249]: EARFCN 2606, 889.60 MHz looking for NPSS.
[207/249]: EARFCN 2607, 889.70 MHz looking for NPSS.
[208/249]: EARFCN 2608, 889.80 MHz looking for NPSS.
[209/249]: EARFCN 2609, 889.90 MHz looking for NPSS.
[210/249]: EARFCN 2610, 890.00 MHz looking for NPSS.
[211/249]: EARFCN 2611, 890.10 MHz looking for NPSS.
[212/249]: EARFCN 2612, 890.20 MHz looking for NPSS.
[213/249]: EARFCN 2613, 890.30 MHz looking for NPSS.
[214/249]: EARFCN 2614, 890.40 MHz looking for NPSS.
[215/249]: EARFCN 2615, 890.50 MHz looking for NPSS.
[216/249]: EARFCN 2616, 890.60 MHz looking for NPSS.
[217/249]: EARFCN 2617, 890.70 MHz looking for NPSS.
[218/249]: EARFCN 2618, 890.80 MHz looking for NPSS.
[219/249]: EARFCN 2619, 890.90 MHz looking for NPSS.
[220/249]: EARFCN 2620, 891.00 MHz looking for NPSS.
[221/249]: EARFCN 2621, 891.10 MHz looking for NPSS.
[222/249]: EARFCN 2622, 891.20 MHz looking for NPSS.
[223/249]: EARFCN 2623, 891.30 MHz looking for NPSS.
[224/249]: EARFCN 2624, 891.40 MHz looking for NPSS.
[225/249]: EARFCN 2625, 891.50 MHz looking for NPSS.
[226/249]: EARFCN 2626, 891.60 MHz looking for NPSS.
[227/249]: EARFCN 2627, 891.70 MHz looking for NPSS.
[228/249]: EARFCN 2628, 891.80 MHz looking for NPSS.
[229/249]: EARFCN 2629, 891.90 MHz looking for NPSS.
[230/249]: EARFCN 2630, 892.00 MHz looking for NPSS.
[231/249]: EARFCN 2631, 892.10 MHz looking for NPSS.
[232/249]: EARFCN 2632, 892.20 MHz looking for NPSS.
[233/249]: EARFCN 2633, 892.30 MHz looking for NPSS.
[234/249]: EARFCN 2634, 892.40 MHz looking for NPSS.
[235/249]: EARFCN 2635, 892.50 MHz looking for NPSS.
[236/249]: EARFCN 2636, 892.60 MHz looking for NPSS.
[237/249]: EARFCN 2637, 892.70 MHz looking for NPSS.
[238/249]: EARFCN 2638, 892.80 MHz looking for NPSS.
[239/249]: EARFCN 2639, 892.90 MHz looking for NPSS.
[240/249]: EARFCN 2640, 893.00 MHz looking for NPSS.
[241/249]: EARFCN 2641, 893.10 MHz looking for NPSS.
[242/249]: EARFCN 2642, 893.20 MHz looking for NPSS.
[243/249]: EARFCN 2643, 893.30 MHz looking for NPSS.
[244/249]: EARFCN 2644, 893.40 MHz looking for NPSS.
[245/249]: EARFCN 2645, 893.50 MHz looking for NPSS.
[246/249]: EARFCN 2646, 893.60 MHz looking for NPSS.
[247/249]: EARFCN 2647, 893.70 MHz looking for NPSS.
[248/249]: EARFCN 2648, 893.80 MHz looking for NPSS.Found 4 cells
Found CELL 879.5 MHz, EARFCN=2505, PHYID=121, NPSS power=-1.6 dBm
Found CELL 879.6 MHz, EARFCN=2506, PHYID=82, NPSS power=4.0 dBm
Found CELL 879.7 MHz, EARFCN=2507, PHYID=407, NPSS power=-6.7 dBm
Found CELL 879.9 MHz, EARFCN=2509, PHYID=44, NPSS power=0.4 dBmBye

即总共发现了四个不同频率的NB-IoT载波，以第一个为例，其载波频率为879.5MHz；EARFCN即E-UTRA Absolute Radio Frequency Channel Number，表示LTE绝对频点号，由它可以计算该LTE频点的中心频率，计算方法可以参考LTE频点计算公式及频点号对应表；PHYID表示所属小区的ID识别号，为121；NPSS即Narrowband Primary Synchronization Signal，表示窄带主同步信号，后面的数值体现了该信号的强弱

使用npdsch_ue解码第四个基站的下行数据

./npdsch_ue -f 879.9e6

解码情况如下所示

Opening RF device...
Available RF device list: UHD 
Trying to open RF device 'UHD'
[INFO] [UHD] linux; GNU C++ version 9.3.0; Boost_107100; UHD_3.15.0.HEAD-0-gaea0e2de
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Opening USRP channels=1, args: type=x300,master_clock_rate=184.32e6
[INFO] [UHD RF] RF UHD Generic instance constructed
[INFO] [X300] X300 initialization sequence...
[INFO] [X300] Connecting to niusrpriorpc at localhost:5444...
[INFO] [X300] Using LVBITX bitfile /usr/local/share/uhd/images/usrp_x310_fpga_HG.lvbitx
[INFO] [X300] Radio 1x clock: 184.32 MHz
[INFO] [GPS] Found an internal GPSDO: LC_XO, Firmware Rev 0.929b
[INFO] [0/DmaFIFO_0] Initializing block control (NOC ID: 0xF1F0D00000000000)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1320 MB/s)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1299 MB/s)
[INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DDC_1] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DUC_0] Initializing block control (NOC ID: 0xD0C0000000000000)
[INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000000)
RF device 'UHD' successfully opened
Set RX gain: 70.0 dB
Set RX freq: 879.900000 MHz
Setting sampling rate 1.92 MHz
Actual sampling rate 1.92 MHz
NSSS with peak=5.396919, cell-id: 44, partial SFN: 0
*Found n_id_ncell:  44 DetectRatio= 0% PSR=9.72, Power=69.0 dBm
Finding PSS... Peak:      4.0, FrameCnt: 0, State: 100
Finding PSS... Peak:      7.2, FrameCnt: 0, State: 100
MIB received (CFO:  -0.07 kHz) FrameCnt: 0, State: 100
Finding PSS... Peak:     10.3, FrameCnt: 0, State: 100
SIGINT received. Exiting....1, FrameCnt: 0, State: 1 0
Saving PCAP fileBye

在这里插入图片描述

5.2 4G端到端系统

本实例旨在实现UE与eNB的空中通信，具体硬件配置架构如下图所示
在这里插入图片描述
其中，核心网部分srsepc和基站部分srsenb可以作为网络内置配置在同一台电脑运行，srsue则在另一台电脑上运行。两台电脑的USRP设备按步骤2各自实现配置即可。电脑和所连接的USRP设备IP地址可设置如下

设备	IP Address
UE-主机	192.168.10.2
UE-USRP	192.168.10.22
eNB-主机	192.168.10.1
eNB-USRP	192.168.10.11
因为我的基站侧电脑采用PCIe线缆和USRP设备进行通信，所以基站侧的主机IP无需进行静态配置

eNB侧

sudo srsepc

在这里插入图片描述
使用默认配置，这将在eNB侧的主机上创建一个IP为172.16.0.1的虚拟网络接口srs_spgw_sgi，此后所有连接到该基站的UE将在此网络中分配一个IP

sudo srsenb      #在另一个终端执行

在这里插入图片描述

UE侧

sudo srsue

使用默认配置，这将在UE侧的主机上创建一个IP为172.16.0.x的虚拟网络接口tun_srsue，该接口可用作 PC上的任何其他网络接口，支持进出网络的数据流量。随后UE会在通信范围内主动搜索存在的基站并建立RRC连接发起随机接入，随后将在网络172.16.0.x中分配到一个IP，假设分配到172.16.0.2。成功实现网络连接的示例控制台输出如下图所示(进入RRC IDLE后需要在控制台上敲入t启用指标跟踪)

在这里插入图片描述
开启另一个终端，执行ping 172.16.0.1，控制台便会出现实时的指标跟踪情况

5.3 基站小区切换 IMPORTANT

5.3.1 Intra-eNB

5.3.2 Inter-eNB

To Be Continue

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【USRPx310系列（NI USRP2940-2955）+ srsRAN】环境搭建与应用

🌏目录

1 Ubuntu20.04 LTS系统安装

1.1 ISO镜像下载

1.2 U盘格式化

1.3 系统安装

1.4 更新软件源

1.5 *可选操作

1.5.1 静态IP配置

1.5.2 安装独立显卡驱动

1.5.3 系统UI美化

2 NI USRP2954连接配置

2.1 SDR介绍

2.2 NI USRP & Ettus USRP

2.3 UHD(USRP Hardware Drivers)源码编译安装

2.4 UHD与X310的通信

2.4.1 USB2.0 & 千兆以太网 & USB3.0

2.4.2 PCIe通信配置

2.4.3 1Gbps网口通信配置

2.5 USRP设备命名

2.6 更改USRP设备IP地址

3 srsRAN环境配置

3.1 srsRAN源码编译安装

3.2 srsGUI源码编译安装

3.3 低时延内核安装

4 srsue & srsepc & srsenb pending

4.1 UE（srsue）

4.1.1 前置操作

4.1.2 UE参数配置

4.1.3 高级用法

4.2 EPC（srsepc）

4.3 eNB（srsenb）

5 srsRAN+USRP应用举例

5.1 NB-IoT信号检测

5.2 4G端到端系统

5.3 基站小区切换 IMPORTANT

5.3.1 Intra-eNB

5.3.2 Inter-eNB

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