 @ 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. GPRS Introduction Chapter 2 vendors such as Motorola, Nokia, Ericsson, Panasonic, and Mitsubishi, mobile computing device vendors like Sony and PDA vendors like 3COM and Handspring will enter the GPRS terminal market. Class A mobile devices are the most complex and lag behind the other classes. Mobile Station Classes for Multislot Capabilities GPRS multislot class refers to the different capabilities to transmit and receive on different combinations of multiple time slots. Twenty-nine dif- ferent classes are available: Class 1 = One receive and one transmit slot Class 29 = Eight transmit and eight receive slots The class defines the number of time slots allowed for the uplink and the number of time slots for the downlink. Both the downlink and the uplink can be different due to the nature of nonsymmetrical traffic. Type 1 mobile stations are not required to transmit and receive at the same time. Type 2 mobile stations are required to transmit and receive at the same time. Rx describes the maximum number of receive time slots that the mobile station can use per TDMA frame. The mobile must be able to support all integer values of receive time slots from zero to Rx (depending on the ser- vices supported by the mobile station). The receive time slot need not be contiguous. For Type 1 mobile stations, the receive time slots shall be allo- cated within the window of size Rx, and no transmit time slots shall occur between receive time slots within a TDMA frame. Tx describes the maximum number of transmit time slots that the mobile station can use per TDMA frame. The mobile station must be able to sup- port all integer values of transmit time slots from zero to Tx (depending on the services supported by the mobile station). The transmit time slots need not be contiguous. For Type 1 mobile stations, the transmit time slots shall be allocated wit