METHOD, PROCESSING DEVICE AND INFORMATION STORAGE MEANS FOR ALLOCATING RESOURCES FOR A DOWNLINK COMMUNICATION ON A FREQUENCY SELECTIVE CHANNEL

• US 20150163817A1
• Filed: 05/31/2013
• Published: 06/11/2015
• Est. Priority Date: 07/20/2012
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Brunel, Loic, Gresset, Nicolas
• Granted Patent: US 9,992,778 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04L 5/0042 intra-user or intra-terminal allocation
• CPC Class Codes: H04L 5/0069 Allocation based on distance or geographical location allocation based on terminal or device properties in general, H04W72/51
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 84/005 Moving wireless networks

Abstract

For allocating resources for a downlink communication on a frequency selective channel from an access point of a wireless telecommunications network to a communication device located in a moving conveyance performing a journey on a path, a processing device performs: obtaining a first interference profile according to a position of the moving conveyance on the path, said first interference profile being representative of interference on said downlink communication implied by at least one interferer located along the path; obtaining a second interference profile, said second interference profile being representative of interference on said downlink communication implied by at least one interferer located in the moving conveyance; and allocating the resources for said downlink communication, on the basis of the first and second interference profiles.

Claims

1-15. -15. (canceled)

16. A method for allocating resources for a downlink communication on a frequency selective channel from an access point of a wireless telecommunications network to a communication device located in a moving conveyance performing a journey on a path, characterized in that a processing device performs:

obtaining a first interference profile according to a position of the moving conveyance on the path, said first interference profile being representative of interference on said downlink communication implied by at least one interferer located along the path;

obtaining a second interference profile, said second interference profile being representative of interference on said downlink communication implied by at least one interferer located in the moving conveyance; and

allocating the resources for said downlink communication, on the basis of the first and second interference profiles.

17. The method according to claim 16, characterized in that:

the first interference profile depends at least on interference measurements or estimations performed relatively to at least one communication device located in the moving conveyance or another moving conveyance during at least one preceding journey on said path;

the second interference profile depends at least on interference measurements or estimations performed relatively to at least one communication device located in the moving conveyance during the journey.

18. The method according to claim 16, characterized in that the communication device located in the moving conveyance performs upon receiving interference signals:

determining whether the received interference signals correspond to interferers located along said path and/or to interferers located in the moving conveyance;

providing information for updating the second interference profile, for received interference signals corresponding to interferers located in the moving conveyance; and

providing information for updating a fingerprint map used to define the first interference profile for at least one next journey of the moving conveyance or another moving conveyance on the path, for received interference signals corresponding to interferers located along said path.

19. The method according to claim 18, characterized in that the communication device located in the moving conveyance, for determining whether the received interference signals correspond to interferers located along said path or to interferers located in the moving conveyance, performs:

decoding a header portion of a data packet present in the received interference signal;

determining an identifier of a transmitter of the data packet, from the decoded header portion;

determining that the received interference signals correspond to interferers located in the moving conveyance when said identifier has been already obtained following interference signals received at another position of the moving conveyance on the path.

20. The method according to claim 18, characterized in that the communication device located in the moving conveyance, for determining whether the received interference signals correspond to interferers located along said path and/or to interferers located in the moving conveyance, performs:

obtaining the first interference profile for a current position of the moving conveyance on the path;

determining second interference profile data from received signals and from the first interference profile;

determining the second interference profile by averaging said determined second interference profile data with other second interference profile data determined for preceding positions of the moving conveyance on the path.

21. The method according to claim 18, characterized in that the communication device located in the moving conveyance, for determining whether the received interference signals correspond to interferers located along said path and/or to interferers located in the moving conveyance, performs:

determining a position of the moving conveyance for which the first interference profile is expected to be negligible;

determining the second interference profile from received signals, when said signals are received when the moving conveyance reaches said position.

22. The method according to claim 16, characterized in that the second interference profile is determined by averaging an interference measured over at least one segment by the communication device located in the moving conveyance minus an averaged interference measured for said segment by at least one communication device located in the moving conveyance or another moving conveyance not carrying any interferer during at least one preceding journey on said path.

23. The method according to claim 22, characterized in that, for a given segment of the path, the first interference profile is refined by averaging an interference measured over said segment by the communication device located in the moving conveyance minus an interference implied by at least one interferer carried by the moving conveyance or another moving conveyance during at least one preceding journey on said path.

24. The method according to claim 16, characterized in that the first and second interference profiles are determined by applying a linear filter to an interference measured over at least one segment by the communication device located in the moving conveyance, said linear filter introducing a bias and producing biased estimations of the first and second interference profiles, wherein said bias becomes negligible when summing the first and second interference profiles.

25. The method according to claim 16, characterized in that the first and second interference profiles are determined by:

determining a probability density function of interference measured by the communication device during said journey and by at least one communication device located in the moving conveyance or another moving conveyance during at least one preceding journey on said path;

determining the characteristic function of the determined probability density function;

applying a logarithm on the determined characteristic function;

identifying the logarithms of the characteristic functions of the interference implied by at least one interferer located along the path and of the interference implied by at least one interferer located in the moving conveyance;

and in that the logarithms of said identified characteristic functions respectively correspond to the first and second interference profiles.

26. The method according to claim 16, characterized in that said first interference profile is determined on the basis of a fingerprint map, said fingerprint map storing data related to interference determined consecutively to at least one preceding journey of the moving conveyance or another moving conveyance on said path, as a function of positions of the moving conveyance on said path or of segments of said path.

27. The method according to claim 26, characterized in that said fingerprint map is stored by a server, in that the server provides a partial fingerprint map to the access point, said partial fingerprint map comprising interference data corresponding at least to an area covered by the access point and in that the processing device is implemented by the access point.

28. The method according to claim 21, characterized in that the processing device performs:

determining at least one segment of the path through which the moving conveyance is expected to travel during the period during which the resources allocation applies, as a function of the speed of the moving conveyance;

determining values of the first and second interference profiles to be taken into account for allocating said resources for said downlink communication, on the basis of the determined segments.

29. The method according to claim 22, characterized in that the processing device performs:

determining at least one segment of the path through which the moving conveyance is expected to travel during the period during which the resources allocation applies, as a function of the speed of the moving conveyance;

determining values of the first and second interference profiles to be taken into account for allocating said resources for said downlink communication, on the basis of the determined segments.

31. Information storage means, characterized in that they store a computer program comprising program code instructions which can be loaded in a programmable device for implementing the method according to claim 16, when the program code instructions are run by the programmable device.

30. A processing device for allocating resources for a downlink communication on a frequency selective channel from an access point of a wireless telecommunications network to a communication device located in a moving conveyance performing a journey on a path, characterized in that the processing device comprises:

means for obtaining a first interference profile according to a position of the moving conveyance on the path, said first interference profile being representative of interference on said downlink communication implied by at least one interferer located along the path;

means for obtaining a second interference profile, said second interference profile being representative of interference on said downlink communication implied by at least one interferer located in the moving conveyance; and

means for allocating the resources for said downlink communication, on the basis of the first and second interference profiles.