所述发送符号通过发送信道被发送，并且作为接收符号(50)被接收。
Said transmission symbols are transmitted via a transmission channel and received as received symbols (50).
时分双工 （TDD）是一种通信系统的双工方式 ，在移动通信系统中用于分离接收和传送信道。
Time Division Duplex (TDD) is a kind of duplex method of communication system, by which uplink and downlink transmissions are time separated in mobile communications.
SS7则使用带外信令，即在另外的一个物理信道上传送信令消息。
SS7 USES out-of-band signaling where signaling messages are carried on a separate physical channel.
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