Method and access network device for interference coordination

Patent metadata

Field	Value
Publication number	US-9894672-B2
Application number	US-200913142828-A
Country	US
Kind code	B2
Filing date	Dec 30, 2009
Priority date	Dec 30, 2008
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

The present invention discloses a method and access network device for interference coordination, said method comprises: getting time-frequency resource of cell, and dividing said time-frequency resource into multiple resource subsets; grouping users to be scheduled in the cell into multiple user groups according to AOA, the amount of said user groups is equal to the amount of said resource subsets, different user groups have different resource subset selection priority orders; allocating time-frequency resource of the resource subsets to users, which are in neighboring cells and have the same direction, according to said resource subset selection priority orders of the user groups. The present invention could reduce inter-cell co-frequency interference and improve channel quality.

First claim

The invention claimed is:

1. A method for interference coordination, comprising:
obtaining time-frequency resource of a cell, and dividing the time-frequency resource into a plurality of resource subsets;
dividing users to be scheduled in the cell into a plurality of user groups according to Angle Of Arrival (AOA) of wave, wherein the number of the user groups is equal to the number of the resource subsets, and each of the user groups has its respective sequence of priorities for selecting among the resource subsets;
transmitting information on the user group comprising the AOA, information on the resource subsets, and the respective sequence of priorities for selecting among the resource subsets for each of the user groups in the cell to neighboring cells, after said dividing users to be scheduled in the cell into a plurality of user groups according to AOA of wave, wherein each of the neighboring cells adjusts the resource subsets and the respective sequence of priorities for selecting among the resource subsets for each user group of a plurality of user groups in the neighboring cell based on a rule that the time-frequency resource of one of the user groups in the neighboring cell is not conflicted with the time-frequency resource of one of the user groups in the cell, while the AOA of one of the user groups in the neighboring cell is same as that of one of the user groups in the cell, after receiving the information on the user group comprising the AOA, information on the resource subsets, and the respective sequence of priorities for selecting among the resource subsets for each of the user groups in the cell; and
allocating the time-frequency resource in the one of the resource subsets to the users of one of the user groups with the same AOA, according to the sequence of priorities for selecting among the resource subsets for one of the user groups.

2. The method of claim 1 , wherein said dividing the time-frequency resource into a plurality of resource subsets comprising:
dividing downlink time-frequency resource included in the time-frequency resource into the resource subsets in a minimum unit of one or more continuous Physical Resource Block (PRB); and
dividing uplink time-frequency resource included in the time-frequency resource into the resource subsets by dividing continuous time-frequency resource according to a rule of mutually orthogonal of time-frequency resource.

3. The method of claim 1 , wherein said dividing users to be scheduled in the cell into a plurality of user groups according to AOA of wave comprising:
dividing angle space for receiving a signal into a plurality of mutually orthogonal angle subspaces according to the AOA, wherein each of the angle subspaces is corresponding to a respective one of the user groups; and
determining a user group that the user belongs to among the plurality of the user groups, according to an angle subspace that the user belongs to among the plurality of the angle subspaces.

4. The method of claim 1 , wherein said allocating the time-frequency resource in one of the resource subsets to the users of the user groups with the same AOA, according to the sequence of priorities for selecting among the resource subsets for one of the user groups comprising:
establishing a mapping relation between each of the user groups and its respective sequence of priorities for selecting among the resource subsets in advance in each of the neighboring cells; and
allocating the time-frequency resource to the users in each neighboring cell according to the user groups that the users belong to and the mapping relation, when the users in each neighboring cell are scheduled in each subframe.

5. The method of claim 4 , wherein establishing the mapping relation between each of the user groups and its respective sequence of priorities for selecting among the resource subsets according to a following rule:
selecting the resource subset with a highest priority in sequence of priorities for selecting among the resource subsets for one of the user groups, wherein the resource subset with the highest priority for one of the user groups is different from the resource subset with the highest priority for another one of the user groups in the respective sequence of priorities for selecting among the resource subsets.

6. The method of claim 4 , further comprising:
transmitting an update information to the neighboring cells, when anyone of the user groups, the resource subsets, and the mapping relation between each of the user groups and its respective sequence of priorities for selecting among the resource subsets is changed, wherein each of the neighboring cells adjusts the user groups, and/or the resource subsets, and/or the mapping relation between each of the user groups and its respective sequence of priorities for selecting among the resource subsets in the neighboring cell according to the update information of the cell, after receiving the update information of the cell.

7. The method of claim 1 , wherein the time-frequency resource is a portion of time-frequency resource of the cell, and the users to be scheduled are at an edge of the cell,
the method further comprising:
differentiating the users at the edge of the cell from the users in a center of the cell based on Reference Signal Receiving Power (RSRP), or pilot signal strength, or Reference Signal Receiving Quality (RSRQ), or pilot signal Channel Quality Indicator (CQI), or detected path loss information, or Signal and Interference to Noise Ratio (SINR) information on each user in the cell.

8. An access network device, comprising:
a processor; and
a non-volatile storage medium, configured to be connected to the processor via a bus interface, and store programs and data to be used by the processor,
wherein upon the processor executes the programs and data stored in the non-volatile storage medium, following modules are implemented:
a resource obtaining module, configured for obtaining time-frequency resource of a cell;
a resource grouping module, configured for dividing the time-frequency resource into a plurality of resource subsets;
a user grouping module, configured for dividing users to be scheduled in the cell into a plurality of user groups according to Angle Of Arrival (AOA) of wave, wherein the number of the user groups is equal to the number of the resource subsets, and each of the user groups has its respective sequence of priorities for selecting among the resource subsets;
a transmitting module, configured for transmitting information on the user group comprising the AOA, information on the resource subsets, and the respective sequence of priorities for selecting among the resource subsets for each of the user groups in the cell to neighboring cells, after said dividing users to be scheduled in the cell into a plurality of user groups according to AOA of wave, wherein each of the neighboring cells adjusts the resource subsets and the respective sequence of priorities for selecting among the resource subsets for each user group of a plurality of user groups in the neighboring cell based on a rule that the time-frequency resource of one of the user groups in the neighboring cell is not conflicted with the time-frequency resource of one of the user groups in the cell, while the AOA of one of the user groups in the neighboring cell is same as that of one of the user groups in the cell, after receiving the information on the user group comprising the AOA, information on the resource subsets, and the respective sequence of priorities for selecting among the resource subsets for each of the user groups in the cell; and
a resource allocating module, configured for allocating the time-frequency resource in the one of the resource subsets to the users of on

Assignees

• Qin Fei
• Zhao Jinbo
• Zhu Zhiqiu
• China Academy Telecommunications Technology

Inventors

• Qin Fei
• Zhao Jinbo
• Zhu Zhiqiu

Classifications

• H04W72/56

  based on priority criteria · CPC title

• H04W72/541

  using the level of interference · CPC title

• H04W52/244

  Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI] · CPC title

• H04W28/0236

  radio quality, e.g. interference, losses or delay · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title