Method, apparatus, base station and user equipment for reducing interference in a wireless communication system

• US 9,537,623 B2
• Filed: 03/28/2012
• Issued: 01/03/2017
• Est. Priority Date: 03/31/2011
• Status: Active Grant

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Zhang, Xiaobo
• Primary Examiner(s): Ton, Dang
• Assistant Examiner(s): Ajid, Abdeltif
• Application Number:
  US14/008,627
• Publication Number:
  US 20140016597A1
• Time in Patent Office: 1,742 Days
• Field of Search: 370/329
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0087 when data requirements change
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/54 based on quality criteria

Abstract

A method, an apparatus, a base station and user equipment for reducing interference in a wireless communication system are provided. The wireless communication system comprises a first cell and a second cell. The method includes mapping a resource grid of at least one of a first type of sub-frame and a second type of sub-frame to reserve at least one resource element in the first type of sub-frame and corresponding to a resource element in the second type of sub-frame and mapped for at least reference signal and a common control channel, and a resource element in the second type of sub-frame and corresponding to a resource element in the first type of sub-frame and mapped for at least one reference signal and a common control channel, for not transmitting information; and transmitting a mapping result of the mapping.

Claims

1. A method for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, wherein an uplink/downlink sub-frame configuration of the first cell and the second cell is asymmetric and can result in implementing a first type of sub-frame at the first cell while implementing a second type of sub-frame different from the first type of sub-frame at the second cell, thereby producing inter-cell interference, the method comprising:

mapping a resource grid of at least one of the first type of sub-frame and the second type of sub-frame to reserve at least one of

a first resource element in the first type of sub-frame and corresponding to a second resource element in the second type of sub-frame and mapped for at least one of a first reference signal and a common control channel, and

a third resource element in the second type of sub-frame and corresponding to a fourth resource element in the first type of sub-frame and mapped for at least one of a second reference signal and the common control channel,

for not transmitting information; and

transmitting a mapping result of the mapping.

2. The method according to claim 1, wherein the first type of sub-frame is a downlink sub-frame and the second type of sub-frame is an uplink sub-frame.

3. The method according to claim 1, wherein the first type of sub-frame is a downlink sub-frame and the second type of sub-frame is a special sub-frame;

and wherein only a resource grid of the first type of sub-frame is mapped to reserve the first resource element in the first type of sub-frame and corresponding to the second resource element in the second type of sub-frame and mapped for at least one of the first reference signal and the common control channel, for not transmitting information.

4. The method according to claim 2, wherein mapping a resource grid of the first type of sub-frame to reserve the first resource element in the first type of sub-frame and corresponding to the second resource element in the second type of sub-frame and mapped for at least one of the first reference signal and the common control channel, for not transmitting information, comprises:

mapping a resource grid of the first type of sub-frame to reserve at least one of the following resource elements in the first type of sub-frame, for not transmitting information;

a resource element corresponding to a resource element mapped for a Physical Uplink Control Channel in the second type of sub-frame;

a resource element corresponding to a resource element mapped for an Uplink Pilot Channel in the second type of sub-frame;

a resource element corresponding to a resource element mapped for a channel Sounding Reference Signal in the second type of sub-frame; and

a resource element corresponding to a resource element mapped for an Uplink Demodulation Reference Signal in the second type of sub-frame.

5. The method according to claim 2, wherein mapping a resource grid of the second type of sub-frame to reserve the third resource element in the second type of sub-frame and corresponding to the fourth resource element in the first type of sub-frame and mapped for at least one of the first reference signal and the common control channel, for not transmitting information, comprises:

mapping a resource grid of the second type of sub-frame to reserve at least one of the following resource elements in the second type of sub-frame, for not transmitting information;

a resource element corresponding to a resource element mapped for a Physical Downlink Control Channel in the first type of sub-frame;

a resource element corresponding to a resource element mapped for a Physical Broadcast Channel in the first type of sub-frame;

a resource element corresponding to a resource element mapped for a dynamic broadcast channel in the first type of sub-frame;

a resource element corresponding to a resource element mapped for a Channel State Information-Reference Signal in the first type of sub-frame;

a resource element corresponding to a resource element mapped for a Cell-Specific Reference Signal in the first type of sub-frame;

a resource element corresponding to a resource element mapped for a Downlink Demodulation Reference Signal in the first type of sub-frame.

6. An apparatus for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, wherein an uplink/downlink sub-frame configuration of the first cell and the second cell is asymmetric and can result in implementing a first type of sub-frame at the first cell while implementing a second type of sub-frame different from the first type of sub-frame at the second cell, thereby producing inter-cell interference, the apparatus comprising:

a mapper configured to map a resource grid of at least one of the first type of sub-frame and the second type of sub-frame to reserve at least one of

a first resource element in the first type of sub-frame and corresponding to a second resource element in the second type of sub-frame and mapped for at least one of a first reference signal and a common control channel, and

a third resource element in the second type of sub-frame and corresponding to a fourth resource element in the first type of sub-frame and mapped for at least one of a second reference signal and the common control channel,

for not transmitting information; and

a transmitter configured to transmit a mapping result of the mapper.

7. A method for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, wherein an uplink/downlink sub-frame configuration of the first cell and the second cell is asymmetric and can result in implementing a first type of sub-frame at the first cell while implementing a second type of sub-frame different from the first type of sub-frame at the second cell, thereby producing inter-cell interference, the method comprising:

receiving information related to mapping of a resource grid of the first type of sub-frame or information related to mapping of a resource grid of the second type of sub-frame, wherein the resource grid of the first type of sub-frame is mapped as reserving a first resource element in the first type of sub-frame and corresponding to a second resource element in the second type of sub-frame and mapped for at least one of a first reference signal and a common control channel, for not transmitting information; and

the resource grid of the second type of sub-frame is mapped as reserving a third resource element in the second type of sub-frame and corresponding to a fourth resource element in the first type of sub-frame and mapped for at least one of a second reference signal and the common control channel, for not transmitting information.

8. A base station for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, wherein an uplink/downlink sub-frame configuration of the first cell and the second cell is asymmetric and can result in implementing a first type of sub-frame at the first cell while implementing a second type of sub-frame different from the first type of sub-frame at the second cell, thereby producing inter-cell interference, the base station comprising:

a receiver configured to receive information related to mapping of a resource grid of the first type of sub-frame or information related to mapping of a resource grid of the second type of sub-frame, wherein the resource grid of the first type of sub-frame is mapped as reserving a first resource element in the first type of sub-frame and corresponding to a second resource element in the second type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information; and

the resource grid of the second type of sub-frame is mapped as reserving a third resource element in the second type of sub-frame and corresponding to a fourth resource element in the first type of sub-frame and mapped for at least one of a second reference signal and the common control channel, for not transmitting information.

9. A method for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, wherein an uplink/downlink sub-frame configuration of the first cell and the second cell is asymmetric and can result in implementing a first type of sub-frame at the first cell while implementing a second type of sub-frame different from the first type of sub-frame at the second cell, thereby producing inter-cell interference, the method comprising:

receiving information related to mapping of a resource grid of the second type of sub-frame;

mapping a resource grid of the first type of sub-frame to reserve a resource element in the first type of sub-frame and corresponding to a resource element in the second type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information.

10. The method according to claim 9, wherein the first type of sub-frame is a downlink sub-frame and the second type of sub-frame is an uplink sub-frame;

and wherein mapping the resource grid of the first type of sub-frame to reserve the first resource element in the first type of sub-frame and corresponding to the second resource element in the second type of sub-frame and mapped for at least one of the first reference signal and the common control channel, for not transmitting information, comprises;

mapping the resource grid of the first type of sub-frame to reserve at least one of the following resource elements in the first type of sub-frame, for not transmitting information;

a resource element corresponding to a resource element mapped for a Physical Uplink Control Channel in the second type of sub-frame;

a resource element corresponding to a resource element mapped for an Uplink Pilot Channel in the second type of sub-frame;

a resource element corresponding to a resource element mapped for a channel Sounding Reference Signal in the second type of sub-frame; and

a resource element corresponding to a resource element mapped for an Uplink Demodulation Reference Signal in the second type of sub-frame.

11. The method according to claim 9, wherein the first type of sub-frame is an uplink sub-frame and the second type of sub-frame is a downlink sub-frame;

and wherein mapping the resource grid of the first type of sub-frame to reserve the first resource element in the first type of sub-frame and corresponding to the second resource element in the second type of sub-frame and mapped for at least one of the first reference signal and the common control channel, for not transmitting information, comprises;

mapping the resource grid of the first type of sub-frame to reserve at least one of the following resource elements in the first type of sub-frame, for not transmitting information;

a resource element corresponding to a resource element mapped for a Physical Downlink Control Channel in the second type of sub-frame;

a resource element corresponding to a resource element mapped for a Physical Broadcast Channel in the second type of sub-frame;

a resource element corresponding to a resource element mapped for a dynamic broadcast channel in the second type of sub-frame;

a resource element corresponding to a resource element mapped for a Channel State Information-Reference Signal in the second type of sub-frame;

a resource element corresponding to a resource element mapped for a Cell-Specific Reference Signal in the second type of sub-frame;

a resource element corresponding to a resource element mapped for a Downlink Demodulation Reference Signal in the second type of sub-frame.

12. The method according to claim 9, further comprising:

transmitting information related to mapping of the resource grid of the first type of sub-frame.

13. A base station for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, wherein an uplink/downlink sub-frame configuration of the first cell and the second cell is asymmetric and can result in implementing a first type of sub-frame at the first cell while implementing a second type of sub-frame different from the first type of sub-frame at the second cell, thereby producing inter-cell interference, the base station comprising:

a receiver configured to receive information related to mapping of a resource grid of the second type of sub-frame;

a mapper configured to map a resource grid of the first type of sub-frame to reserve a resource element in the first type of sub-frame and corresponding to a resource element in the second type of sub-frame and mapped for at least one of a reference signal and a common control channel, for not transmitting information.

14. The base station according to claim 13, further comprising:

a transmitter configured to transmit information related to mapping of a resource grid of the first type of sub-frame.

15. A User equipment for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, wherein an uplink/downlink sub-frame configuration of the first cell and the second cell is asymmetric and can result in implementing a first type of sub-frame at the first cell while implementing a second type of sub-frame different from the first type of sub-frame at the second cell, thereby producing inter-cell interference, the user equipment comprising:

a receiver configured to receive information related to mapping of a resource grid of the first type of sub-frame or information related to mapping of a resource grid of the second type of sub-frame, wherein the resource grid of the first type of sub-frame is mapped as reserving a first resource element in the first type of sub-frame and corresponding to a second resource element in the second type of sub-frame and mapped for at least one of a first reference signal and a common control channel, for not transmitting information; and

the resource grid of the second type of sub-frame is mapped as reserving a third resource element in the second type of sub-frame and corresponding to a fourth resource element in the first type of sub-frame and mapped for at least one of a second reference signal and the common control channel, for not transmitting information.