Radio and MS-PCUSN Interfaces Chapter 6 Options available in GPRS cell include Network Mode of Operation (NMO) (mode I, mode II, mode III) ACCESS_BURST_TYPE (PRACH on 8 or 11 bits) Network control order parameters (NCO, NC1, NC2) GPRS power control parameters Network Control It will be possible for the network to order the mobile stations to send mea- surement reports to the network and to suspend its normal cell reselection and accept decisions from the network instead. The degree to which the mobile station resigns its radio network control is variable and is ordered in detail by the parameter NETWORK_CONTROL ORDER. The following actions are possible to order to the mobile stations, as illus- trated in Figure 6-8: NCO (normal mobile station control) The mobile station performs autonomous cell reselection. NC1 (mobile station control with measurement reports) The mobile station sends measurement reports to the network according to additional information in the message NC1. It continues its normal cell reselection. NC2 (network control) The mobile station sends measurement reports to the network according to additional information in the message NC2. It does not perform cell reselection on its own, and can only make a cell reselection according to a cell reselection command received from the network. Two parameters are broadcast on the PBCCH and are valid in packet transfer and packet idle modes respectively for all mobile stations in the cell: NETWORK_CONTROL ORDER Can also be sent individually to a mobile station on PACCH, in which case it overrides the broadcast parameter REPORTING_PERIOD The interval of time between the measurements Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hil Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Radio and MS-PCUSN Interfaces Radio and MS-PCUSN Interfaces Figure 6-8 Network control MS control with orders. measurement report Normal MS control The MS sends 