ication SIC-D8 PCUSN Switch TS31=OML+RSL+GSL OML+RSL+GSL = TS Tel+1 GPRS on OML (sapi 62)= Radio configuration RSL (sapi0): = TS sharing between GSM and GPRS GSL (sapi 1)= RACH, Immediate Assign, Paging 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. Function of GPRS Elements Chapter 4 Agprs OML BSC-PCU The BSC and PCU terminate the OML. It conveys all messages dedicated to operation and maintenance (OAM) for radio-related issues. It is primar- ily composed of Cell and TDMA configuration from the BSC to PCU to indicate operational and maintenance control for radio (OMC-R) configuration regarding radio-related issues (cell properties or number if static time slot is used for GPRS) Mapping of static time slots to Agprs interface from the PCU to the BSC Agprs GSL BTS-PCU (Through the BSC) The Agprs GSL is concentrated by the BSC. The BTS terminates the Um Common Control Channels (CCCHs) and forwards all the GPRS-specific messages on the GSL to the BSC that concentrates all BTS messages to the PCU. It is mainly composed of The channel request from the mobile station for Temporary Block Flow (TBF) Establishment Granted Paging from PCU to the mobile station for TBF Downlink Establishment Request Agprs RSL BSC-PCU The Agprs RSL conveys all the messages dedicated to the allocation of GPRS time slots and dynamic radio time slots between GSM and GPRS. It is mainly composed of Indication from BSC to PCU to define the availability/unavailability of radio TDMA and radio cell for GPRS Time slot requests from the PCU to the BSC to get more GPRS resources Time slot grant/recover from the BSC to the PCU to give back or get GPRS resources for GSM purposes 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 