name: TOW
full_form: Time Of Week
context: GNSSj: The weighting Matrix W is defined as a diagonal matrix containing the estimated variances calculated from the "Code Phase RMS Error" and/or "Pseudorange RMS Error" values: Step 4: WLS position solution The WLS position solution is described in e.g., [16] and usually requires the following steps: 1) Computation of satellite locations at time of transmission using the ephemeris parameters and user algorithms defined in the relevant ICD of the particular GNSS. The satellite locations are transformed into WGS-84 reference frame, if needed. 2) Computation of clock correction parameters using the parameters and algorithms as defined in the relevant ICD of the particular GNSS. 3) Computation of atmospheric delay corrections using the parameters and algorithms defined in the relevant ICD of the particular GNSS for the ionospheric delay, and using the Gupta model defined in [17] p. 121 equation (2) for the tropospheric delay. For GNSSs which do not natively provide ionospheric
description: Time Of Week (TOW) refers to a parameter used in GPS timing, representing the time of week in milliseconds when measurements were taken. It is included in the measurement report as an Information Element (IE), specifically 'GPS TOW msec', and is set to the GPS TOW when the measurements were valid.
explanation: The context provided from 3GPP TS 37.571, section 6.2.1.2, clearly indicates that TOW is a parameter related to GPS timing used in measurement reports for emergency calls. The mention of including 'GPS TOW msec' as an IE and setting it to the GPS TOW when measurements were valid directly points to its role as a specific piece of information (parameter) within the telecommunications protocol.
section_title: 6.2.1.2	NI-LR Emergency call: UE-Assisted A-GNSS
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