mon downlink channel without closed-loop power con- (FACH) trol used for transmission of relatively small amount of data. Downlink Shared Channel A downlink channel shared by several UEs carrying dedi- (DSCH) cated control or traffic data. Uplink Shared Channel An uplink channel shared by several UEs carrying dedicated (USCH) control or traffic data, used in TDD mode only. Broadcast Channel (BCH) A downlink channel used for broadcast of system information into an entire cell. Paging Channel (PCH) A downlink channel used for broadcast of control informa- tion into an entire cell allowing efficient UE sleep mode pro- cedures. Currently identified information types are paging and notification. Another use could be UTRAN notification of change of BCCH information. Dedicated Dedicated Channel (DCH) A channel dedicated to one UE used in uplink or downlink Fast Uplink Signalling Chan- An uplink channel used to allocate dedicated channels in nel (FAUSCH) conjunction with FACH Each transport channel, excluding the FAUSCH9, 9 gets an associated transport format when having a fixed or slow changing rate, or an associated transport format set when having a fast changing rate. We define the transport format as a combination of encod- ing, interleaving, bit rate and mapping onto physical channels [11]. We define the trans- 8 They transport signal and traffic information. It only conveys a reservation request. The UMTS Development Platform port format set as a group of transport formats. In the context of the latter, e.g. variable rate DCH has a transport format set, i.e. one transport format for each rate, whereas a fixed rate DCH has a single transport format [9]. 3.8.2.2 L1 Functions Chapter 4 describes the main functions of L1; here we list a summary from [9] to com- plete the services and functions introduction. error detection on transport channels and indication to higher layers; FEC encoding/decoding and interleaving/de-interleaving of transport channels; multiplexing of transport channels and de-multiplexing of coded c