But text messages are not just tiny; they are also free riders, tucked into what's called a control channel, space reserved for operation of the wireless network.
不过短信可不仅仅是微小，它们还是搭便车者，硬挤进了为无线网络运营而预留的信道里面。
2
An SDP client communicates with an SDP server using a reservedchannel on an L2CAP link to find out what services are available.
SDP客户端使用L2CAP链接上的保留通道与SDP服务器通信，来发现哪些服务可用。
3
The scheme provided reservedchannel for handover call to reduce blocking probability of handoff call.