-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. Short Message Service (SMS) Short Message Service (SMS) nal in the registered but inactive state, and perhaps the effect would not be signifi- cant. However, short messages also can be received while users are on calls. What effect will excessive short messages have on a user terminal in the middle of a call? Are there any possible glare conditions that would cause equipment failure or confuse the user? And what effect, if any, will SMS, EMS, and MMS messages have on total cell capacity? Also, as more messages are sent, some will have errors, even if the error rate is very low. Should error detection and retransmission be enabled in MMS? If not, how will components and users detect and respond to failed messages? 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. Short Message Service (SMS) 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 Wireless Data Services The drive for enhanced second-generation (2G) and third-generation (3G) cellular ser- vices is due to the perception that there is demand for transmitting data over the cel- lular network. This was the only one of the two original goals of the 3G standards committee to survive the politics that arose as the standards were developed. The other goal, a single worldwide standard for cellular networks, will not happen any time soon as cdma2000 and wideband code division multiple access (W-CDMA) battle it out in the marketplace and in the media. 21.1 QoS over the Air Interface As the detail standards