Tsg-ran working Group 3 tsgr3#18(01)0110




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3GPP-TSG-RAN Working Group 3 TSGR3#18(01)0110

Lindingo, Sweden, January 15-19, 2001




TSG-RAN Working Group 3 TSGR3#18(01)0110

Lindingo, Sweden, January 15-19, 2001



Agenda Item : RB 12.3


Source: LUCENT TECHNOLOGIES

Title: AGPS Study Area: text proposal for the technical report

Document for: Approval

1Proposal

It was agreed, at the last RAN 3 meeting, that aspects related to OTDOA and AGPS that require support in the NBAP and RNSAP specifications shall be included in the study area of the TR 25.850.


In this contribution, texts are proposed for inclusion in the Technical Report for the UE Positioning in the relevant sections as indicated below.


6.4. Assisted GPS Absolute Timing Difference and Other Parameters
The LCS Measurement Unit (LMU) is the entity that performs measurements for the purpose of LCS. There are two classes of LMU: Stand-alone LMU and Associated LMU (ALMU). An ALMU may be connected to or integrated in a Node-B and may make use of the radio apparatus and antennas of its associated Node-B.
The SRNS, which is responsible for calculating the final location of an UE, may require measurements from the ALMU via the CRNC. The SRNC may also require the DRNC to carry out the measurements if the Node B associated with the ALMU is controlled by the DRNC.
The functional entity responsible for performing and gathering uplink/downlink radio signal measurements for use in the calculation of a UE location is the Position Signal Measurement Function (PSMF). The PSMF may ask the ALMU to make measurements in response to requests or to autonomously measure and report the measurements regularly. PSMF may also request Node B to conditionally report measurements based on some defined criteria such as any significant changes in radio condition (e.g., frequency drifting at the Node B).
6.4.1. Iub Interface
The following measurements shall be obtainable from the Node B [2]:

- Inter-System Timing measurements: include the Absolute Time Difference (ATD) between the UTRAN radio signals transmitted by a Node-B and an external system such as the GPS satellite navigation system. The ATD has been specified in [1] as the TUTRAN-GPS.

In addition, Round Trip Time, which has to be corrected by UE Receiving Transmitting Time (UE RxTx, also specified in [1]), may be used (provided the measurements are performed from the same Node B with which the ATD is referenced) to improve the performance of UE assisted GPS [2]. These parameters are part of OTDOA methods and shall be addressed as part of the OTDOA solution.
6.4.2. Iur Interface
In the case where the ALMU is located in the Node B of the DRNC, the following measurement [2] shall be obtainable from the DRNC over the Iur:

- Inter-System Timing measurements: include the Absolute Time Difference (ATD) between the UTRAN radio signals transmitted by a Node-B and an external system such as the GPS satellite navigation system. The ATD has been specified in [1] as the TUTRAN-GPS.

In addition, Round Trip Time, which has to be corrected by UE Receiving Transmitting Time (UE RxTx, also specified in [1]), may be used (provided the measurements are performed from the same Node B with which the ATD is referenced) to improve the performance of UE assisted GPS [2]. These parameters are part of OTDOA methods and shall be addressed as part of the OTDOA solution.
6.5. Assisted GPS Assistance Data from Reference GPS Receiver


6.6. Relocaton
For the AGPS, only the data that remains intact (such as LCS information that is kept at the core network) should be transferred to the new SRNC during SRNC relocation.

[1] TS25.215



[2] TS25.305


3GPP


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