Temporal analysis for user speed estimation in wireless networks

Patent metadata

Field	Value
Publication number	US-2016146930-A1
Application number	US-201414904631-A
Country	US
Kind code	A1
Filing date	Jul 11, 2014
Priority date	Jul 12, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

A method for estimating the speed of a user equipment connected to a base station of a wireless network, the method comprising the following steps: measuring the power of a signal transmitted between the user equipment and the base station; computing the derivative of the measured signal power with respect to time; computing the standard deviation of the computed derivative; estimating, from previously established reference data, the speed of the user equipment that corresponds to the computed standard deviation, the reference data associating a given user equipment speed with a certain computed standard deviation.

First claim

1 . A method for estimating the speed of a user equipment connected to a base station of a wireless network, the method comprising:
measuring the power of a signal transmitted between the user equipment and the base station; computing the derivative of the measured signal power with respect to time; computing the standard deviation of the computed derivative; estimating, from previously established reference data, the speed of the user equipment that corresponds to the computed standard deviation, the reference data associating a given user equipment speed with a certain computed standard deviation.

2 . The method of claim 1 , further comprising a normalization of the measured signal power.

3 . The method of claim 1 , further comprising a filtering step of the measured signal power.

4 . The method of claim 1 , being carried out on a predefined number of measured signal powers.

5 . The method of claim 4 , wherein the method is updated at each signal power measurement, in order to track the speed of the user equipment.

6 . The method of claim 1 , wherein the reference data associates a given user equipment speed with a certain computed standard deviation for a given shadowing decorrelation distance, the shadowing decorrelation distance being relevant to the radio environment of the base station.

7 . The method of claim 1 , wherein the signal power measurement is performed by the base station on an uplink signal transmitted from the user equipment.

8 . The method of claim 1 , wherein the transmitted signal between the user equipment and the base station is a sounding reference signal.

9 . A processing unit for estimating the speed of a user equipment connected to a base station of a wireless network, the processing unit comprising
a module configured to measure the power of a signal transmitted between the user equipment and the base station; a module configured to compute the derivative of the measured signal power with respect to time; a module configured to compute the standard deviation of the computed derivative; a module configured to estimate, from previously established reference data, the speed of the user equipment that corresponds to the computed standard deviation, the reference data associating a given user equipment speed with a certain computed standard deviation.

10 . The processing unit of claim 9 , further comprising a low pass filter for filtering the measured signal power.

11 . A base station comprising a processing unit according to claim 9 .

12 . Computer program implemented on a processing unit, the program including code sections for performing instructions corresponding to a method according to claim 1 .

Assignees

• Alcatel Lucent
• Inst Nat Rech Inf Automat

Inventors

• Ben Rached Nidham
• Capdevielle Veronique
• Haddad Majed
• Ratovelomanana Frédéric
• Feki Afef
• Altman Eitan

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• G01S11/06 Primary

  using intensity measurements · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W72/0413

  Electricity · mapped topic