Different faces of PN Pollution

Problem Statement from Craig Sonnenberg, Project Manager | BJC Healthcare:
My wife had to take my daughter to the 9th Floor Hem Onc area of SLC today.  We both have Sprint service, but we're not able to have even a partial conversation without the voice service cutting out.  She also tried calling our land-line, but that failed as well.

Summary of what we found:
DAS is working well and as expected, but the stated room is at the edge of the building at a high elevation, so we are facing the pilot pollution which we have experienced at few other locations and resolved.
Due to the height we are seeing PNs where some of them are not even from the neighbors (I have attached the PN maps of the campus we are looking at). These other PNs we have seen are: 510, 480, 45, 393, 258, 429, 504,33, etc.
Possible Solution: Install an antenna at the location. We have open port at the RHU located at the 11 th floor of the SLCH.

Relevant Comments:
On Fri, Sep 9, 2011 at 11:23 AM, Zipprich, Jacob R [Ericsson Contractor for Sprint] <Jacob.Zipprich@sprint.com> wrote:
I added neighbors to the neighbor list of the DAS sectors a few weeks back.  This will at least help let calls get back to the DAS sector if they get onto one of the PNs the mobile sees on the upper floors.  The trouble is that a lot of the PNs that the mobiles are seeing on the upper floors are as many as 7 tiers away and it will be difficult to keep adding neighbors in as the neighbor list is already reaching its limits.
Jacob is the RF Engineer for the St. Louis Market

On Fri, Sep 9, 2011 at 12:10 PM, Sweetser, Seth S [BMG] <Seth.Sweetser@sprint.com> wrote:
I think the open park (Forest Park) plays a part.  There might be a random wave of RF from a tower miles and miles away that the handset picks up at time, and causes that pollution – the handset goes haywire, and doesn’t know what to do.  I saw this issue at the American Express lower Manhattan building.  RF from distant towers was traveling down the Hudson River, and hitting that building right in the face – causing similar PN Pollution.  The only fix was to add antennas to over saturate with in-building coverage, so the handset has no choice.

We might find this issue to be even worse during the winter.

Seth is the Program Manager for BJC (from Sprint)