Fractional frequency reuse in heterogeneous networks

• US 10,097,300 B2
• Filed: 07/24/2013
• Issued: 10/09/2018
• Est. Priority Date: 12/15/2010
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Boudreau, Gary David, Dimou, Konstantinos, Falconetti, Laetitia, Huschke, Jorg
• Primary Examiner(s): HEIBER, SHANTELL LAKETA
• Application Number:
  US13/949,788
• Publication Number:
  US 20130310060A1
• Time in Patent Office: 1,903 Days
• Field of Search: None
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

A base station node (BS) of a heterogeneous radio access network comprises a terminal locator (34) and a scheduler (36). The terminal locator (34) obtains an indication of location of a wireless terminal (30) in a cell served by the base station (BS), e.g., whether the wireless terminal (30) is in a center region (M) or an edge region (E) for the cell served by the base station node (BS). The scheduler (36) uses the indication of location to assign to the wireless terminal (30) a frequency of a frequency bandwidth usable by the heterogeneous radio access network. The scheduler (36) assigns a frequency from a partitioned portion of the frequency bandwidth if the cell served by the base station node is a micro cell and the wireless terminal is in an edge region of a micro cell. The scheduler (36) also assigns a frequency of the frequency bandwidth if the cell served by the base station node is a micro cell and the wireless terminal is in a center portion of the micro cell.

Claims

1. A base station node of a heterogeneous radio access network, the heterogeneous radio access network comprising a macro layer including at least one macro cell served by a macro base station node and a micro layer including at least one micro cell served by a micro base station node, the base station node comprising:

a terminal locator configured to obtain an indication of location of a wireless terminal in a cell served by the base station node, wherein;

the cell is a micro cell and the base station node is a micro base station node; and

the heterogeneous radio access network comprises plural macro cells and plural micro cells within each of the plural macro cells; and

a scheduler configured to assign to the wireless terminal, based on the indication of location of the wireless terminal in the cell served by the base station node, a frequency of the frequency bandwidth usable by the base station node in the heterogeneous radio access network, wherein the frequency bandwidth usable by the heterogeneous radio access network is divided into plural partitions, the scheduler being configured to;

assign a frequency from a frequency-partitioned portion of the frequency bandwidth usable by the base station node in the heterogeneous radio access network if the indication of location of the wireless terminal indicates that the wireless terminal is in an edge region of the cell served by the base station node, the frequency-partitioned portion being less than the entire frequency bandwidth usable by the base station node in the heterogeneous radio access network;

assign a frequency from the frequency bandwidth usable by the base station node in the heterogeneous radio access network, including a portion of the frequency bandwidth usable by the base station node that is not included in the frequency partitioned portion, if the indication of location of the wireless terminal indicates that the wireless terminal is located elsewhere in the cell; and

assign a frequency from a selected one of the plural partitions of the frequency bandwidth, the selected one of the plural partitions being a same partition which is used, by another base station node serving another micro cell in a same macro cell, to assign a frequency to another wireless terminal in an edge region of the another micro cell, but the selected one of the plural partitions being different from another partition which is used, by yet another base station node serving another micro cell in another macro cell which is adjacent to the macro cell, to assign a frequency to yet another wireless terminal in an edge region of the yet another micro cell.

2. The base station node of claim 1, further comprising electronic circuitry operable to serve as the scheduler.

3. The base station node of claim 1, wherein the scheduler is configured to assign a frequency from a second partition if the wireless terminal is in an edge region of the micro cell served by the micro base station node.

4. The base station node of claim 3, wherein the selected one of the plural partitions is a same partition that is used by a fourth micro base station node within a third macro cell to assign a frequency to a wireless terminal in an edge region of a fourth cell served by the fourth micro base station node which is in the third macro cell.

5. The base station node of claim 1, wherein the selected one of the plural partitions is a different partition than that which is used by a fourth micro base station node, the fourth micro base station node within the macro cell, to assign a frequency to any wireless terminal within a fourth cell served by the fourth micro base station node.

6. The base station node of claim 1, wherein the scheduler is further configured to assign the frequency from the selected one of plural partitions of the frequency bandwidth, the selected one of the plural partitions being a different partition than that which is used, by a fourth base station node serving a fourth micro cell in the same macro cell, to assign a frequency to another wireless terminal in an edge region of the fourth micro cell.

7. A base station node of a heterogeneous radio access network, the heterogeneous radio access network comprising a macro layer including at least one macro cell served by a macro base station node and a micro layer including at least one micro cell served by a micro base station node, the base station node comprising:

a terminal locator configured to obtain an indication of location of a wireless terminal in a cell served by the base station node, wherein;

the cell is a micro cell and the base station node is a micro base station node; and

the heterogeneous radio access network comprises plural macro cells and plural micro cells within each of the plural macro cells; and

a scheduler configured to assign to the wireless terminal, based on the indication of location of the wireless terminal in the cell served by the base station node, a frequency of the frequency bandwidth usable by the base station node in the heterogeneous radio access network, wherein the frequency bandwidth usable by the heterogeneous radio access network is divided into plural partitions, the scheduler being configured to;

assign a frequency from a frequency-partitioned portion of the frequency bandwidth usable by the base station node in the heterogeneous radio access network if the indication of location of the wireless terminal indicates that the wireless terminal is in an edge region of the cell served by the base station node, the frequency-partitioned portion being less than the entire frequency bandwidth usable by the base station node in the heterogeneous radio access network; and

assign a frequency from the frequency bandwidth usable by the base station node in the heterogeneous radio access network, including a portion of the frequency bandwidth usable by the base station node that is not included in the frequency partitioned portion, if the indication of location of the wireless terminal indicates that the wireless terminal is located elsewhere in the cell; and

wherein the plural partitions are divided into plural sub-partitions, wherein a first partition is associated with the plural macro cells and a second partition is associated with the plural micro cells, wherein a first sub-partition of the second partition is primarily for micro cells in a first macro cell and a second sub-partition of the second partition is primarily for micro cells in a second macro cell, wherein the base station node serves a particular micro cell comprising the plural micro cells, and wherein the scheduler is further configured to assign to the wireless terminal a frequency selected from a selected sub-partition of the second partition if the wireless terminal is in an edge region of the particular micro cell.

8. The base station node of claim 7, wherein the selected sub-partition of the second partition is associated with the macro cell in which the particular micro cell is located.