Configure channels with a disconnect interval so that they can go inactive when there is no activity on the channel after a period of time.
为通道配置断开连接间隔，以便通道上在一段时间后没有活动时，通道能转为非活动状态。
2
When there are not data being transmitted on the channel, both sides shall send link test packets every time interval C to maintain the connection.
当信道上没有数据传输时，通信双方应每隔时间C发送链路检测包以维持此连接。
3
Then analyzes the performance of overcoming inter symbol interference (ISI) and inter channel interference (ICI) of the guard interval (GI) and the cyclic prefix (CP).