ell as for mobile-to-mobile calls, are going to be MSC pairs in the same system serving the same city. Some of these pairs of switches are going to have a lot of traffic between them. Any city with two major wireless calling areas in two separate MSC regions is likely to have a lot of calls between the two areas. We need to form a clear picture of the traffic loads as a function of the time of day. It is not the peak traffic but high daily average traffic that makes dedicated transport attractive. We should combine our best hour-by-hour estimates of roamer terminations and mobile-to-mobile calls between each pair of MSCs to decide where to use dedicated transport and how much to use. The analysis in Sec. 26.3 can be used to determine how much transport, how many DS-1 or E-1 links, to put between each pair of MSCs for this cost-saving opportunity. Estimates of mobile-to-mobile traffic should take marketing plans and promotional offers into account. For example, a marketing plan that promotes several cell phones on one plan for a family and offers free calling among those phones might well increase the inter-MSC mobile-to-mobile traffic among MSCs that support the business district, residential neighborhoods, schools, and shopping malls of one city. 37.2 MSC-to-Network Transport Planning In planning the links from the MSC to the PSTN and to data service connection points, our first goal should be a very low blocking rate. Our second goal should be to reduce the cost of transport facilities. 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. MSC Transport Planning Planning for CDMA Capacity 37.2.1 Voice transport to the PSTN The connection between the MSC and the PSTN carries almost all the voice call traf- fic. As described in Chap. 36, we may decide to save some money by siphoning off some mobile-to-mobile calls, but this is a small share of the 