Method and apparatus for scheduling resource allocation to control inter-cell interference in a cellular communication system, and base station thereof

• US 8,543,123 B2
• Filed: 08/18/2010
• Issued: 09/24/2013
• Est. Priority Date: 01/22/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Moon, June, Park, Sung-Woo, Kang, Seung-Won, Kwon, Ho-Joong, Yoon, Soon-Young
• Primary Examiner(s): PATEL, MAHENDRA R
• Application Number:
  US12/858,655
• Publication Number:
  US 20110183679A1
• Time in Patent Office: 1,133 Days
• Field of Search: 455/296, 455/450, 4554521-4522, 455/453, 455/464, 455/522, 455/67.13, 455/501, 370/329, 370/328, 370/252, 370/318, 370/319, 370/315, 370/316, 375/141, 514/14.3
• US Class Current: 455/450
• CPC Class Codes: H04W 16/04 Traffic adaptive resource partitioning
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A method and apparatus for controlling inter-cell interference in an evolved Node-B for a cellular communication system with a frequency reuse factor of 1 are provided. The apparatus includes a bitmap generator for receiving scheduling information from evolved Node-Bs of a plurality of neighbor cells, and for generating scheduling information including its cell'"'"'s bitmap information for the resource allocation using the received neighbor cells'"'"' scheduling information, and a scheduler for scheduling the resource allocation for UEs in its cell based on the scheduling information provided from the bitmap generator and power allocation information of the UEs in its cell.

Claims

1. An apparatus for scheduling resource allocation to control inter-cell interference in a cellular communication system, the apparatus comprising:

a bitmap generator for receiving scheduling information from evolved Node-Bs of a plurality of neighbor cells, and for generating scheduling information including its cell'"'"'s bitmap information for the resource allocation using the received neighbor cells'"'"' scheduling information; and

a scheduler for scheduling the resource allocation for User Equipments (UEs) in its cell based on the scheduling information provided from the bitmap generator and power allocation information of the UEs in its cell,

wherein the bitmap generator determines a neighbor cell set for generation of the bitmap information by selecting a predefined number of neighbor cells from among the plurality of neighbor cells,

wherein the bitmap generator receives Reference Signal Received Power (RSRP) information for the plurality of neighbor cells from the UEs in its cell to generate the bitmap information,

wherein the predefined number of neighbor cells is selected according to the RSRP information in descending order of the RSRP, and

wherein the bitmap information comprises its cell'"'"'s Relative Narrowband Transmit Power (RNTP) bitmap information.

2. The apparatus of claim 1, wherein its cell'"'"'s Relative Narrowband Transmit Power (RNTP) bitmap information is generated using the neighbor cells'"'"' RSRP information.

3. The apparatus of claim 2, wherein the bitmap generator is adapted to generate its cell'"'"'s RNTP bitmap using RNTP bitmap information received from the plurality of neighbor cells and Resource Block (RB)-specific average rate information provided from the scheduler.

4. The apparatus of claim 1, wherein the bitmap generator comprises:

a neighbor cell set determiner for receiving Reference Signal Received Power (RSRP) information for neighbor cells from a plurality of UEs via a communication interface, and for determining a neighbor cell set for generation of Relative Narrowband Transmit Power (RNTP) bitmap; and

a bitmap calculator for receiving from an Inter-Cell Interference Coordination (ICIC) scheduler a scheduling result and for generating RNTP bitmap using the received scheduling result.

5. The apparatus of claim 1, wherein the scheduler is adapted to receive instantaneous Wideband Channel Quality Indicator (CQI) from each of the plurality of UEs and allocate a UE-specific power level depending on a channel environment of each UE.

6. The apparatus of claim 5, wherein the scheduler is adapted to allocate the UE-specific power level using a value obtained by filtering a spectral efficiency calculated from the instantaneous Wideband CQI in a time domain.

7. The apparatus of claim 6, wherein the scheduler is adapted to allocate a relatively high power level to a pertinent UE as the filtered value is smaller.

8. The apparatus of claim 1, wherein the scheduler comprises:

a user power allocator for allocating a UE-specific power level according to a power allocation scheme; and

an Inter-Cell Interference Coordination (ICIC) scheduler for performing resource allocation scheduling for every Transmission Time Interval (TTI) using scheduling information including Relative Narrowband Transmit Power (RNTP) bitmap provided from the bitmap generator.

9. A method for scheduling resource allocation to control inter-cell interference in a cellular communication system, the method comprising:

receiving scheduling information from evolved Node-Bs of a plurality of neighbor cells;

generating its cell'"'"'s bitmap information for the resource allocation using the received neighbor cells'"'"' scheduling information; and

scheduling the resource allocation for User Equipments (UEs) in its cell based on the generated bitmap information and power allocation information of the UEs in its cell,

wherein the generating of its cell'"'"'s bitmap information comprises determining a neighbor cell set for generation of the bitmap information by selecting a predefined number of neighbor cells from among the plurality of neighbor cells,

wherein the generating of its cell'"'"'s bitmap information comprises receiving Reference Signal Received Power (RSRP) information for the plurality of neighbor cells from the UEs in its cell,

wherein the generating of its cell'"'"'s bitmap information comprises selecting the predefined number of neighbor cells from among the plurality of neighbor cells in descending order of the RSRP, and

wherein the bitmap information comprises its cell'"'"'s Relative Narrowband Transmit Power (RNTP) bitmap information.

10. The method of claim 9, wherein the generating of its cells bitmap information comprises sorting the RSRP information received from the plurality of neighbor cells in descending order.

11. The method of claim 9, wherein its cell'"'"'s Relative Narrowband Transmit Power (RNTP) bitmap information is generated using the neighbor cells'"'"' RSRP information.

12. The method of claim 11, wherein the generating of its cell'"'"'s bitmap information comprises generating its cell'"'"'s RNTP bitmap using Resource Block (RB)-specific average rate information and RNTP bitmap information received from the plurality of neighbor cells.

13. The method of claim 9, wherein the scheduling of the resource allocation comprises receiving an instantaneous Wideband Channel Quality Indicator (CQI) from each of the plurality of UEs and allocating a UE-specific power level according to a channel environment of each UE.

14. The method of claim 13, wherein the scheduling of the resource allocation comprises allocating the UE-specific power level using a value obtained by filtering a spectral efficiency calculated from the instantaneous Wideband CQI in a time domain.

15. The method of claim 14, wherein the scheduling of the resource allocation comprises allocating a relatively high power level to a pertinent UE as the filtered value is smaller.

16. An evolved Node-B apparatus for scheduling resource allocation to control inter-cell interference in a cellular communication system, the apparatus comprising:

a communication interface for communicating with each of a plurality of neighbor cells'"'"' evolved Node-Bs and a plurality of User Equipments (UEs);

a bitmap generator for receiving scheduling information from the plurality of neighbor cells'"'"' evolved Node-Bs, and for generating scheduling information including its cell'"'"'s bitmap information for the resource allocation using the received neighbor cells'"'"' scheduling information; and

a scheduler for scheduling the resource allocation for UEs in its cell based on the scheduling information provided from the bitmap generator and power allocation information of the UEs in its cell,

wherein the bitmap generator determines a neighbor cell set for generation of the bitmap information by selecting a predefined number of neighbor cells from among the plurality of neighbor cells,

wherein the bitmap generator receives Reference Signal Received Power (RSRP) information for the plurality of neighbor cells from the UEs in its cell to generate the bitmap information,

wherein the predefined number of neighbor cells is selected according to the RSRP information in descending order of the RSRP, and

wherein the bitmap information comprises its cell'"'"'s Relative Narrowband Transmit Power (RNTP) bitmap information.