Apparatus and method for interference cancellation in broadband wireless communication system

• US 8,447,310 B2
• Filed: 11/07/2007
• Issued: 05/21/2013
• Est. Priority Date: 11/07/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yu, Tak-Ki, You, Cheol-Woo, Jung, Young-Ho, Lee, Sang-Min
• Primary Examiner(s): DOAN, KIET M
• Application Number:
  US11/936,544
• Publication Number:
  US 20080108363A1
• Time in Patent Office: 2,022 Days
• Field of Search: 455/114.2, 455/450, 375/267, 375/240.01, 370/329, 370/328, 370/336
• US Class Current: 455/450
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/14 using user query or user detection
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 92/20 between access points

Abstract

An Apparatus and a method for interference cancellation in a wireless communication system are provided. When a resource of an Interference Cancellation (IC) zone is allocated to a terminal traveling in a service coverage, resource allocation information relating to an IC zone of neighbor cells is gathered. Resource allocation information is generated relating to the resource allocated to the terminal comprising resource allocation information of the IC zone of the neighbor cells. The resource allocation information relating to the resource allocated to the terminal is transmitted to the terminal. Accordingly, when the interference is present, the interference cancellation is carried out to reduce the load on the terminal and enhance the reception performance.

Claims

1. An operating method of a Base Station (BS) for interference cancellation in a wireless communication system, the method comprising the steps of:

gathering resource allocation information relating to an Interference Cancellation (IC) zone of neighbor cells, when a resource of the IC zone is allocated to a terminal traveling in a coverage, wherein the IC zone has a fixed Modulation and Coding Scheme (MCS) format,

generating resource allocation information relating to the resource of the IC zone allocated to the terminal, wherein the resource allocation information comprises a bit map that includes information indicating whether the neighbor cells use a same resource as the resource allocated to the terminal; and

transmitting the resource allocation information relating to the resource of the IC zone allocated to the terminal, to the terminal,

wherein generating resource allocation information comprises;

determining whether a neighbor cell exists that uses the same resource as the resource allocated to the terminal using the resource allocation information of the IC zone of the neighbor cells;

constituting information relating to whether the neighbor cells use the same resource as the resource allocated to the terminal, as a bit map; and

generating resource allocation information relating to the resource of the IC zone allocated to the terminal comprising the bit map,

wherein the bit map comprises information relating to whether every cell adjacent to the BS or one or more neighbor cells selected based on a receive signal strength among the neighbor cells use the same resource as the resource allocated to the terminal.

2. The operating method of claim 1, wherein the resource allocation information relating to the resource allocated to the terminal comprises at least one of an ID of the terminal, an IC zone resource ID allocated to the terminal, a communication method of the terminal, and resource allocation information relating to the IC zone of the neighbor cells.

3. An operating method of a terminal for interference cancellation in a wireless communication system, the method comprising the steps of:

confirming an Interference Cancellation (IC) zone resource allocated from a serving cell based on resource allocation information relating to an IC zone, when the resource allocation information relating to the IC zone is received from the serving cell, wherein the IC zone has a fixed Modulation and Coding Scheme (MCS) format;

determining whether a neighbor cell exists that uses a same resource as the resource allocated from the serving cell, based on the resource allocation information; and

canceling interference when the neighbor cell exists that uses the same resource as the resource allocated from the serving cell;

wherein the resource allocation information comprises a bit map that includes information indicating whether neighbor cells use the same resource as the resource allocated from the serving cell,

wherein canceling interference comprises;

removing interference signals from all neighbor cells that use the same resource as the resource allocated from the serving cell or removing interference signals from neighbor cells selected based on an effect of the interference signal, when at least two neighbor cells use the same resource as the resource allocated from the serving cell.

4. An operating method of a Base Station (BS) for interference cancellation in a wireless communication system, the method comprising the steps of:

confirming resource allocation information of an Interference Cancellation (IC) zone, when an IC zone resource is allocated to a terminal traveling in a service coverage, wherein the IC zone has a fixed Modulation and Coding Scheme (MCS) forma);

generating the resource allocation information of the IC zone and separate resource allocation information relating to the resource allocated to the terminal; and

sending the resource allocation information of the IC zone and the resource allocation information relating to the resource allocated to the terminal,

wherein generating resource allocation information comprises;

dividing resources of the IC zone to a size smaller than or equal to a redundancy bit of the resource allocation information relating to the resource allocated to the terminal;

constituting resource allocation information of each divided interval as a bit map; and

generating the resource allocation information relating to the resource allocated to the terminal comprising the resource allocation information of the divided interval,

wherein generating the resource allocation information relating to the resource allocated to the terminal comprises;

sequentially including resources of the IC zone to the resource allocation information relating to the resource allocated to one or more terminals to which the resources of the IC zone are allocated, or including resource allocation information of a divided interval including the resource allocated to the terminal to the resource allocation information relating to the resource allocated to the terminal.

5. The operating method of claim 4, wherein generating resource allocation information comprises:

generating a broadcast message that carries the resource allocation information of the IC zone as a bit map; and

generating the resource allocation information relating to the resource allocated to the terminal.

6. The operating method of claim 4, wherein the resource allocation information relating to the resource allocated to the terminal comprises at least one of an ID of the terminal, an IC zone resource ID allocated to the terminal, a communication method of the terminal, and resource allocation information of the divided interval.

7. The operating method of claim 4, wherein the resource allocation information of the IC zone is positioned at a front portion of a control signal indicative of allocation information of an entire radio resource.

8. An operating method of a terminal for interference cancellation in a wireless communication system, the method comprising:

confirming an Interference Cancellation (IC) zone resource allocated from a serving cell using IC zone resource allocation information received from the serving cell, wherein an IC zone has a fixed Modulation and Coding Scheme (MCS) format

confirming resource allocation information of an IC zone of neighbor cells using control signals received at terminal from the neighbor cells;

determining whether a neighbor cell exists that uses the same resource as a resource allocated from the serving cell; and

canceling interference when the neighbor cell exists that uses the same resource as the resource allocated from the serving cell,

wherein cancelling interference comprises;

removing interference signals from one or more neighbor cells that use the same resource as the resource allocated from the serving cell or removing interference signals from neighbor cells selected based on the effect of the interference signal, when at least two neighbor cells use the same resource as the resource allocated from the serving cell.

9. The operating method of claim 8, wherein confirming resource allocation information of the IC zone of the neighbor cells comprises:

receiving resource allocation information of the IC zone, resource allocation information broadcast by the neighbor cells, and confirming the resource allocation information of the IC zone of the neighbor cells.

10. The operating method of claim 8, wherein confirming resource allocation information of the IC zone of the neighbor cells comprises:

determining whether resource allocation information of the IC zone, which is transmitted from the neighbor cells to terminals allocated resources of the IC zone of the neighbor cells, is received; and

confirming resource allocation information relating to divided intervals of the IC zone from the resource allocation information of the IC zone received from the neighbor cells.

11. A wireless communication system for interference cancellation comprising:

a Base Station (BS) for allocating resources of an Interference Cancellation (IC) zone by scheduling according to scheduling information of terminals in a service coverage, wherein the IC zone has a fixed Modulation and Coding Scheme (MCS) format; and

a terminal for canceling interference, when the resource of the IC zone is allocated and the terminal is interfered by neighbor cells according to resource allocation information of the IC zone of the neighbor cells,

wherein the terminal cancels interference when a neighbor cell exists that uses the same resource as the resource allocated from the serving cell by checking the resource allocated from the serving cell and the resource allocation information of the IC zone of the neighbor cells in the IC zone resource allocation information received from the serving cell.

12. The wireless communication system of claim 11, wherein the BS comprises IC zone resource allocation information of the neighbor cells gathered from the neighbor cells as a bit map, wherein the IC zone resource allocation information generates resource allocation information relating to the IC zone resource allocated to the terminal, the resource allocation information comprising the bit map, and transmits the resource allocation information to the terminal.

13. The wireless communication system of claim 11, wherein the BS generates resource allocation information relating to the IC zone resource allocated to the terminal, transmits the resource allocation information to the terminal, generates and broadcasts the IC zone resource allocation information constituted as the bit map.

14. The wireless communication system of claim 11, wherein the BS divides the resources of the IC zone, constitutes resource allocation information of each divided interval as a bit map, includes the resource allocation information of the divided interval constituted as the bit map to resource allocation information relating to terminals allocated the resources of the IC zone, and transmits the resource allocation information to the terminals.

15. The wireless communication system of claim 11, wherein the terminal cancels interference when a neighbor cell exists that uses the same resource as the resource allocated from the serving cell by checking the resource allocated from the serving cell in the IC zone resource allocation information received from the serving cell and the IC zone resource allocation information of the neighbor cells in the resource allocation information received from the neighbor cells.