MA system as its limits are approached is crucial to the prac- tical design of these systems. In the next chapter we will look at the capacity issues specifically related to transmission of subscriber data. 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. CDMA Principles for Multicellular Systems 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. Source: CDMA CAPACITY AND QUALITY OPTIMIZATION Chapter CDMA Data Capacity Principles Point-to-point data transmission service is defined by three things: rate, errors, and delay. The bit rate of a data service is typically well defined by a standard. The stan- dard reflects the best data rate that can be provided reliably over a given interface. cdmaOne, cdma2000, wideband CDMA (W-CDMA), and time division synchronized CDMA (TD-SCDMA) each have data services defined in the standard. In code division multiple access (CDMA), data capacity, that is, the number of data links that can be supported, is determined by the data rate of the service and the bit-error-rate (BER) requirement. That is, the maximum capacity of a server, cell, or system can be deter- mined by the data rate given each user and the BER requirement. The actual capacity will vary depending on the radio link conditions and the resulting Eb/No requirement (the ratio between energy per bit and interference).¹ The delay is mostly determined by the packet pipes between the base station and the public packet data network (PPDN). Jitter within the transmission channel is not sig- nificant to the user. The higher-level data services can ensure that the packets are processed in order even if they arrive out of order, and the slight addition to delay cre- ated by this management 