Method and arrangements in a mobile telecommunication network

• US 8,050,691 B2
• Filed: 08/02/2006
• Issued: 11/01/2011
• Est. Priority Date: 08/11/2005
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Kangas, Ari
• Primary Examiner(s): Karikari; Kwasi
• Application Number:
  US12/063,529
• Publication Number:
  US 20100173645A1
• Time in Patent Office: 1,917 Days
• Field of Search: 455/456.1, 455/457, 342/352, 342/357.2, 342/357.23, 342/357.28, 342/357.39, 342/357.63, 342/357.41, 342/357.78, 342/405, 342/418
• US Class Current: 455/456.1
• CPC Class Codes: G01S 5/02216 Timing or synchronisation of the receivers
• CPC Class Codes: G01S 5/06 Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements G01S5/12 takes precedence

Abstract

The present invention relates to a method and an arrangement in a mobile telecommunication network for detection of a UE transmitted signal. The arrangement comprises means for detecting the signal during the time t_tot, wherein said means comprises a correlator adapted for combined coherent and non-coherent correlation, wherein the length of the coherent correlation interval is L signal samples, the number of coherent correlation intervals is M and the coherent correlation results in a coherent correlation result for each of the coherent detection intervals M, and means for adding the coherent correlation results non-coherently. Further, the arrangement comprises means for selecting one of the length L of coherent detection interval and the total detection interval t_tot based on at least one of the parameters cell size, UE speed and acceleration, number of participating Location Measurements Units and a desired total false alarm rate.

Claims

1. An arrangement in a mobile telecommunication network for detection of a User Equipment (UE) transmitted signal, the arrangement comprising:

means for detecting the signal during the time t_tot, wherein said means comprises a correlator configured to perform combined coherent and non-coherent correlation, wherein the length of the coherent correlation interval is L signal samples, the number of coherent correlation intervals is M and the coherent correlation results in a coherent correlation result for each of the coherent detection intervals M; and

means for adding the coherent correlation results non-coherently, wherein selecting one of the length L of the coherent detection interval and the total detection interval t_tot is based on the parameters cell size, UE speed and acceleration, number of participating Location Measurements Units (LMU), and a desired total false alarm rate.

2. The arrangement according claim 1, wherein the coherent correlation interval is based on at least one of the parameters cell size, UE speed and acceleration, number of participating LMUs and a desired total false alarm rate.

3. The arrangement according to claim 1, wherein the total detection interval t_tot is based on at least one of the parameters cell size, UE speed and acceleration, number of participating LMUs and a desired total false alarm rate.

4. The arrangement according to claim 1, wherein the correlator is located in a LMU.

5. The arrangement according to claim 1, wherein the correlator is located in a Serving Mobile Location Center.

6. The arrangement according to claim 1, wherein the total detection interval t_tot is a predetermined value.

7. The arrangement according to claim 6, wherein the predetermined value is dependent on a maximal allowed response time.

8. A method in a mobile telecommunication network for detection of a User Equipment (UE) transmitted signal, comprising the steps of:

detecting the signal during the time t_tot, wherein said detection step comprises the steps of;

combining a coherent and non-coherent correlation, wherein the length of the coherent correlation interval is L signal samples, the number of coherent correlation intervals is M and the coherent correlation results in a coherent correlation result for each of the coherent detection intervals M; and

,

adding the coherent correlation results non-coherently wherein the length L of the coherent detection interval and the total detection interval t_tot are based on the parameters cell size, UE speed and acceleration, number of participating Location Measurements Units (LMU), and a desired total false alarm rate.

9. The method according claim 8, wherein the coherent correlation interval is based on at least one of the parameters cell size, UE speed and acceleration, number of participating LMUs and a desired total false alarm rate.

10. The method according to claim 8, wherein the total detection interval t_tot is based on at least one of the parameters cell size, UE speed and acceleration, number of participating LMUs and a desired total false alarm rate.

11. The method according to claim 8, wherein the step of detecting is performed in a LMU.