Method for uplink interference coordination on demand basis with cell identification, inter-cell interference detection and downlink measurement, a base station, a mobile terminal and a mobile network therefor

• US 20070004423A1
• Filed: 06/14/2006
• Published: 01/04/2007
• Est. Priority Date: 06/15/2005
• Status: Active Grant

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Haberland, Bernd, Gerlach, Christian
• Granted Patent: US 7,974,652 B2
• Time in Patent Office: Days
• US Class Current: 455/452.200
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 72/27 between access points
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

The invention concerns a method for coordination of the interference in the uplink between cells (B1, B2) of a single frequency network with the frequency band used for uplink being subdivided into at least two subsets (F1 F2 . . . FR), whereby a resource related to a dedicated subset is allocated to a mobile terminal (T1) located in a first cell (B1) of said cells in the border area to a neighbor cell (B2-B4), the base station of the cell (B2) with the highest interference damage caused by the mobile terminal (T1) accepts a high interference level on said dedicated subset dependent on network criteria, and the usage of said dedicated subset in the cell (B2) with the highest interference damage caused by the mobile terminal (T1) is restricted under observation of the interference level, a base station, a mobile terminal and a mobile network therefor.

Claims

1. A method for coordination of the interference in the uplink between cells of a single frequency network with the frequency band used for uplink being subdivided into at least two subsets, wherein

a resource related to a dedicated subset is allocated to a mobile terminal located in a first cell of said cells in the border area to a neighbor cell,

the base station of the cell with the highest interference damage caused by the mobile terminal accepts a high interference level on said dedicated subset dependent on network criteria,

and the usage of said dedicated subset in the cell with the highest interference damage caused by the mobile terminal is restricted under observation of the interference level.

2. A method according to claim 1, wherein if a mobile terminal located in the cell with the highest interference damage caused by the mobile terminal causes interference in the first cell, said mobile terminal located in the cell with the highest interference damage caused by the mobile terminal gets a power limitation dependent on network criteria on said dedicated subset or is not allowed to use said dedicated subset.

3. A method according to claim 1, wherein the usage of said dedicated subset is limited in power dependent on network criteria for mobile terminals located in neighbor cells of said first cell that cause interference in said first cell.

4. A method according to claim 1, wherein if the mobile terminal does no longer need the resource related to said dedicated subset, the usage of said dedicated subset in the cell with the highest interference damage caused by the mobile terminal is no longer restricted, and the base station of the cell with the highest interference damage caused by the mobile terminal no longer accepts a high interference level on said dedicated subset.

5. A method according to claim 1, wherein the base station of the first cell asks the base station of the cell with the highest interference damage caused by the mobile terminal to give away said resource.

6. A method according to claim 1, wherein

the base station of a cell identifies by means of dedicated cell specific signals transmitted from mobile terminals from which other cell an interference in a subset stems from,

said base station sends to the base station of the cell from which said interference stems from a notification about the interference,

and the base station of the cell from which said interference stems from finds out by means of its history or further information about its mobile terminals from which mobile terminal the interference was caused.

7. A method according to claim 1, wherein

the base station of a cell identifies by means of dedicated cell specific signals transmitted from mobile terminals from which other cells interference in average stems from,

and the base station asks the base stations from which cells high interference in average is caused to limit the power in the dedicated subset for mobile terminals that cause interference in the cell.

8. A method according to claim 1, wherein

a mobile terminal evaluates in which cell it creates interferences by means of downlink interference or path loss measurements,

and said mobile terminal signals to its serving base station said measurements or results deduced from said measurements.

12. A mobile network comprising base stations for coordination of the interference in the uplink between cells of a single frequency network with the frequency band used for uplink being subdivided into at least two subsets wherein

the base station comprises means for asking another base station to give away a resource,

and said base station comprises means for scheduling said resource to a mobile terminal that said base station serves for performing a method according to claim 1.

13. A mobile network comprising mobile terminals for coordination of the interference in the uplink between cells of a single frequency network with the frequency band used for uplink being subdivided into at least two subsets wherein

the mobile terminal comprises means for evaluating in which cell it creates interferences by means of downlink interference or path loss measurements,

and the mobile terminal comprises means for signaling to its serving base station said measurements or results deduced from said measurements for performing a method according to claim 1.

9. A base station for coordination of the interference in the uplink between cells of a single frequency network with the frequency band used for uplink being subdivided into at least two subsets wherein

the base station comprises means for asking another base station to give away a resource,

and said base station comprises means for scheduling said resource to a mobile terminal that said base station serves.

10. A base station according to claim 9, wherein

the base station comprises means for identifying by means of dedicated cell specific signals transmitted from mobile terminals from which other cell an interference stems from,

the base station comprises means for sending to the base station of the cell from which said interference stems from a notification about the interference,

and the base station comprises means for finding out by means of its history or further information about its mobile terminals from which mobile terminal the interference was caused.

11. A mobile terminal for coordination of the interference in the uplink between cells of a single frequency network with the frequency band used for uplink being subdivided into at least two subsets wherein

the mobile terminal comprises means for evaluating in which cell it creates interferences by means of downlink interference or path loss measurements,

and the mobile terminal comprises means for signaling to its serving base station said measurements or results deduced from said measurements.