Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Random Access Channel (RACH) is used in mobile phones or other wireless device on a TDMA-based network when it needs to get the attention of a base station in order to initially synchronize its transmission with the base station. Random Access Channel is a shared channel that is used by Wireless Access terminals to Access the Access Network(TDMA/FDMA,and CDMA based network) especially for initial Access and Bursty data transmission. A key feature of a Random Access Channel is that messages are not scheduled (compared to for example a "Dedicated Channel" in UMTS, that is assigned exclusively to one user at a time). There is no certainty, that only a single device makes a connection attempt at one time, and collisions can result.

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