用python画出由UE端发起的释放EPS承载的流程图，在图中展示信令Attach success/connection success等信令

为了画出流程图，我们可以使用Python中的matplotlib库。下面是一个示例代码，可以帮助您开始：

import matplotlib.pyplot as plt

# 设置图形大小和标题
fig = plt.figure(figsize=(8,6))
fig.suptitle("UE Release EPS Flowchart")

# 定义节点和箭头
ax = fig.add_subplot(1,1,1)
ax.set_xlim([0,10])
ax.set_ylim([0,10])
ax.arrow(1,9,0,-3, head_width=0.5, head_length=0.5, fc='k', ec='k')
ax.arrow(3,9,0,-3, head_width=0.5, head_length=0.5, fc='k', ec='k')
ax.arrow(5,9,0,-3, head_width=0.5, head_length=0.5, fc='k', ec='k')
ax.arrow(7,9,0,-3, head_width=0.5, head_length=0.5, fc='k', ec='k')
ax.arrow(2,6,2,0, head_width=0.5, head_length=0.5, fc='k', ec='k')
ax.arrow(4,6,2,0, head_width=0.5, head_length=0.5, fc='k', ec='k')
ax.arrow(6,6,2,0, head_width=0.5, head_length=0.5, fc='k', ec='k')
ax.arrow(3,3,0,-3, head_width=0.5, head_length=0.5, fc='k', ec='k')
ax.arrow(5,3,0,-3, head_width=0.5, head_length=0.5, fc='k', ec='k')

# 添加节点标签
ax.text(0.5, 9.5, 'UE', fontsize=12)
ax.text(1.5, 6.5, 'Attach \nRequest', fontsize=12, ha='center', va='center')
ax.text(3.5, 6.5, 'Attach \nAccept', fontsize=12, ha='center', va='center')
ax.text(5.5, 6.5, 'Connection \nRequest', fontsize=12, ha='center', va='center')
ax.text(7.5, 6.5, 'Connection \nAccept', fontsize=12, ha='center', va='center')
ax.text(2, 3.5, 'Detach \nRequest', fontsize=12, ha='center', va='center')
ax.text(4, 3.5, 'Detach \nAccept', fontsize=12, ha='center', va='center')

# 添加信令标签
ax.text(1, 8, 'Attach \nRequest', fontsize=10, ha='center', va='center')
ax.text(3, 8, 'Attach \nSuccess', fontsize=10, ha='center', va='center')
ax.text(5, 8, 'Connection \nRequest', fontsize=10, ha='center', va='center')
ax.text(7, 8, 'Connection \nSuccess', fontsize=10, ha='center', va='center')
ax.text(3, 5, 'Detach \nRequest', fontsize=10, ha='center', va='center')
ax.text(5, 5, 'Detach \nAccept', fontsize=10, ha='center', va='center')

# 隐藏坐标轴
ax.axis('off')

plt.show()

这个代码将生成以下流程图：