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<br />U S WEST Communication. Group <br />428 North Falrview Room 101 <br />SI. Paul, MN 55104 <br /> <br />(' F 2.Q2Q <br /> <br />Wlrel... <br /> <br />llj.WE5T' <br /> <br />July 3, 1997 <br /> <br />Zoning Board <br />City of Roseville <br />Minnesota <br /> <br />Re: Non feasibility study of Roseville water tower as possible alternate for US WEST <br />MINI04 located at 2582 Long Lake Road, Roseville. <br /> <br />Dear Members: <br /> <br />US WEST Communications is scheduled to deploy a wireless Personal <br />Communications System (PCS) for the Minneapolis - St. Paul greater metropolitan area <br />in the .third quarter of 1997. The intent of the deployed system will be to provide <br />ubiquitous wireless services to the Twin Cities communities. In order to meet the <br />requirements of continuous (seamless) coverage and to be able to carry the projected <br />traffic and to cover the surrounding neighborhoods, a cell site (MINI04) is currently <br />designed to be built at 2582 Long Lake Road, Roseville. <br /> <br />While choosing an appropriate location for a proposed cell site, we try to <br />meet the coverage and capacity objectives of that particular service area. In a typical <br />situation when a system designer is faced with a trade off between capacity and <br />coverage, the RF design engineer applies the knowledge of the terrain and surrounding <br />clutter to the site selection process. In choosing a site at 2582 Long Lake Road, <br />Roseville, the analysis from theoretical modeling and actual drive tests showed that in <br />order to cover the very heavily traveled intersection around Rte. 36 and 1-35W it was <br />imperative to put cell site North of the intersection which would be able to connect to <br />our northern site on 1-35W. The accompanying coverage map will conclusively show <br />the need for a cell site at our proposed location. Regarding capacity, CDMA <br />technology has an inherent advantage over comparable (current) analog technologies. <br />A conservative calculation puts this capacity advantage at six times for comparable <br />operating bandwidths. For a 1.25 MHz bandwidth (the bandwidth to be utilized in US <br />WEST's initial deployment), about 1000 subscribers per site can be supported during <br />busy hour (with an acceptable call blocking probability). For capacity, we need to look <br />into the traffic carried on 1-35 W flowing into the intersection ofI-35W and Rte. 36. <br />For the intersection around Rte. 36 and 1-35W the Minnesota DOT gives the traffic <br />volume as approximately 90,000 automobiles per day, on average. With other <br />secondary roads including Rte. 88 and Rte. 23 the volume is approximately 100,000 <br />automobiles per day, on average. A reasonable estimate puts the traffic carrying <br />