Method and apparatus for efficiently controlling inter-cell interference power in a wireless communication system

• US 9,730,054 B2
• Filed: 01/18/2012
• Issued: 08/08/2017
• Est. Priority Date: 01/18/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Van Lieshout, Gert Jan, Jeong, Kyeong In, Kim, Soeng Hun, Kim, Sang Bum
• Primary Examiner(s): Rutkowski, Jeffrey M
• Assistant Examiner(s): Li, Ning
• Application Number:
  US13/979,066
• Publication Number:
  US 20130286883A1
• Time in Patent Office: 2,029 Days
• Field of Search: None
• CPC Class Codes: H04W 12/65 Environment-dependent, e.g. using captured environmental data
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 8/24 Transfer of terminal data
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present invention relates to a method and apparatus for efficiently controlling inter-cell interference power in a wireless communication system. According to the present invention, a measurement method to be performed by a terminal in a wireless communication system comprises the following steps: receiving, from a base station, an RRC connection reestablishment message containing pattern information for measuring a serving cell or an adjacent cell; measuring, for an object to be measured indicated by said RRC reestablishment message, the serving cell or adjacent cell using the pattern information; and reporting the result of the measurement to the base station.

Claims

1. A measurement method of a terminal in a wireless communication system, the method comprising:

receiving radio resource control (RRC) connection reconfiguration message including pattern information in a form of a bitmap having a certain size for serving cell or neighbor cell measurement;

mapping bits of the bitmap to subframes one-to-one; and

measuring the serving cell or neighbor cell in the subframes based on the mapping of the bits of the bitmap to the subframes one-to-one,

wherein the mapping comprises mapping a first bit of the bitmap to a first subframe of a frame having a system frame number (SFN) 0 when the SFN is reset to 0 after at least part of the bits of the bitmap are mapped to subframes having a last SFN one-to-one and a cycle of the SFN is not an integer multiple of the size of the bitmap.

2. The method of claim 1,

wherein the wireless communication system uses at least one of frequency division duplex or time division duplex in which the size of the bitmap is different, and

wherein the size of the bitmap is determined depending on time division duplex configuration, when the wireless communication system uses the time division duplex.

3. The method of claim 1, wherein the measuring of the serving cell or neighbor cell comprises:

determining, when the cycle of the SFN ends, whether the cycle of the SFN is not the integer multiple of the size of the bitmap;

terminating, when the cycle of the SFN is not the integer multiple of the size of the bitmap, application of current pattern information to the subframes at a time when the SFN becomes 0; and

performing the measurement based on the mapping of the first bit of the bitmap to the first subframe of the frame having the SFN 0.

4. The method of claim 1, further comprising:

reporting measurement result to a base station.

5. The method of claim 1, wherein subsequent bits of the first bit of the bitmap are mapped to subsequent subframes of the first subframe of the frame one by one.

6. The method of claim 5, wherein the bitmap is mapped to the subframes repeatedly.

7. The method of claim 1, further comprising before receiving the RRC connection reconfiguration message:

receiving a capability report request message from a base station; and

transmitting a capability report message to notify of capability of inter-cell interference coordination.

8. A terminal for measuring a serving cell or neighbor cell in a wireless communication system, the terminal comprising:

a transceiver which transmits and receives signals to and from a base station and performs measurement for the serving cell or neighbor cell; and

at least one processor configured to;

control the transceiver to receive a radio resource control (RRC) connection reconfiguration message including pattern information in a form of bitmap having a certain size for serving cell or neighbor cell measurement,

map bits of the bitmap to subframes one-to-one, and

measure the serving cell or neighbor cell in the subframes based on the mapping of the bits of the bitmap to the subframes one-to-one,

wherein the at least one processor is further configured to map a first bit of the bitmap to a first subframe of a frame having a system frame number (SFN) 0 when the SFN is reset to 0 after at least part of the bits of the bitmap are mapped to subframes having a last SFN one-to-one and a cycle of the SFN is not an integer multiple of the size of the bitmap.

9. The terminal of claim 8,

wherein the wireless communication system uses at least one of frequency division duplex or time division duplex in which the size of the bitmap is different, and

wherein the size of the bitmap is determined depending on time division duplex configuration, when the wireless communication system uses the time division duplex.

10. The terminal of claim 8, wherein the at least one processor is further configured to:

determine, when the cycle of the SFN ends, whether the cycle of the SFN is not the integer multiple of the size of the bitmap,

terminate, when the cycle of the SFN is not the integer multiple of the size of the bitmap, application of current pattern information to the subframes at a time when the SFN becomes 0, and

perform the measurement based on the mapping of the first bit of the bitmap to the first subframe of the frame having the SFN 0.

11. The terminal of claim 8, wherein the at least one processor is configured to control the transceiver to report measurement result to the base station.

12. The terminal of claim 8, wherein subsequent bits of the first bit of the bitmap are mapped to subsequent subframes of the first subframe of the frame one by one.

13. The terminal of claim 12, wherein the bitmap is mapped to the subframes repeatedly.

14. The terminal of claim 8, wherein the at least one processor is configured to:

control the transceiver, before receiving the RRC connection reconfiguration message,

receive a capability report request message from the base station, and

transmit a capability report message to notify of capability of inter-cell interference coordination.