n the PACCH) to get several blocks on a Packet Assignment Request (using the PACCH as well). PAGCH is transmitted on a normal burst. Packet Notification Channel (PNCH) DL) is used for Point-to- Multipoint-Multicast (PTM-M) notification. In GPRS Phase II, it is a Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Radio and MS-PCUSN Interfaces Chapter 6 downlink-only channel that sends PTM-M notification to a group of mobile stations prior to the PTM-M packet transfer actually taking place. This notification is in the form of a Resource Assignment message. The Packet Broadcast Control Channel (PBCCH) is DL only. It broadcasts packet data system information and follows the same predefined rules for mapping onto the physical channels as the Broadcast Control Channel (BCCH) in GSM. The existence of the PBCCH is indicated on the BCCH and if it is not allocated, the packet system is contained in the BCCH control messaging system. The Packet Traffic Channels (PTCHs), comprising PDTCH UL or DL is used for data traffic. This channel is used for data transfer and mapped directly onto one of the physical channel (Time Division Multiple Access [TDMA] time slots). These are temporarily dedicated to one mobile station or a group of mobile stations. One mobile station may use multiple PDTCHs in parallel for individual packet transfer. Up to eight PDTCHs, each with different time slots, may be allocated to one mobile station at one time or to a group of mobile stations in the case of PTM-M. PACCH UL or DL is used for control signaling. This channel is a dedicated control channel function that conveys signaling information related to a mobile station. This includes acknowledgements and power control information. It also carries Resource Assignment and Reassignment messages consisting of the assignment of a capacity for a Packet Data Traffic Channel and for furth