Rich re: Why would Leap consider a network solution and not a handset solution. What is there about Leaps network that would go against the Q/Snap solution??
LWIN infra is 100% LU I think. LU has their own AFLT (advanced forward link trilateration) technology solution (with the associated PDE) for E-911 which competes against the Q/Snap solution. LU probably has made LWIN a pretty good deal on it and has shown them how they can comply with FCC using only AFLT for the different phases. The jury is still out (IMO) on whether or not it complies in the real world.
More info below, or you can do a search on IS-801
Session A2: PUBLIC SAFETY SYSTEMS & E-911
Paper #4
PERFORMANCE ANALYSIS OF POSITION LOCATION METHODS BASED ON IS-801 STANDARD:
H.S. Kim, M.P. Hyun, G.-I. Jee, Y.J. Lee, GPS System Lab, Konkuk University, Korea
One method to meet the positioning requirement for E911 is to include GPS receiver in the mobile cellular phone. Lately, several position location solutions f or E911, so called network aided or server aided GPS are being developed and proposed. The standard for this is TIA/EIA/IS-801 by Telecommunications Industry Association (TIA) announced in October, 1999.
This standard defines the formats to transmit and receive the GPS and communication data between the mobile station and the base station. This doesn't define which positioning method should be used and how they should be implemented on the mobile communication network. There would be many different positioning methods and implementations satisfying the IS-801. The aim of this paper is to investigate the positioning performance of the positioning method implemented in CDMA networks while satisfying the IS-801.
The IS-801 defines the message content, known as PDDM(position determination data message), between the mobile station and the base station for determining position of the mobile station. Depending on which data are used and how they are processed, there could be various positioning methods like stand-alone GPS method, stand-alone forward link trilateration method using CDMA pilot tone, network assisted GPS, software GPS method, hybrid GPS and AFLT(advanced forward link trilateration) method using one or two GPS satellites data of mobile station and one or two pilot signals from base stations.
In this paper, various position location methods that can be implemented in CDMA network via IS-801 are invested and compared by simulations and field experiments. Their positioning performances are analyzed to see whether they can meet the position accuracy requirement defined in E911 Phase II.
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