Apparatus and method for controlling power in cellular system using wired relay stations

• US 7,809,327 B2
• Filed: 10/25/2007
• Issued: 10/05/2010
• Est. Priority Date: 11/21/2006
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group), Sogang University Research Foundation
• Original Assignee: Industry-Academic Cooperation Foundation Yonsei University, Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Lee, Jae-Hoon, Hwang, Seong-Taek, Sung, Won-Jin, Choe, Jin-Woo, Lee, Byoung-Seok, Shong, In-Hong
• Primary Examiner(s): Anderson; Matthew D
• Assistant Examiner(s): Safaipour; Bobbak
• Application Number:
  US11/977,473
• Publication Number:
  US 20080119216A1
• Time in Patent Office: 1,076 Days
• Field of Search: 455/7, 455/522, 455/69, 455/67.11, 455/456.2, 455/507, 455/510, 455/512, 455/524
• US Class Current: 455/7
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/26 using transmission rate or quality of service QoS [Quality of Service]
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/386 centralized, e.g. when the radio network controller or equivalent takes part in the power control
• CPC Class Codes: H04W 52/46 in multi hop networks, e.g. wireless relay networks

Abstract

A method of controlling power in a Base Station (BS) of a cellular system using wired Relay Stations (RSs) includes the RSs and the BS individually performing scheduling of packets to be transmitted to Mobile Stations (MSs) in respective areas of coverage, the BS increasing a difference between a sum of signals to be transmitted and a sum of interference signals according to a scheduling result, guaranteeing a minimum amount of data to be received by each MS, and calculating a power allocation solution of each MS, which satisfies a condition that the power allocation solution is in a range of allocatable power, which was pre-set by each of the RSs and the BS, and the RSs and the BS performing sub-channel allocation and power allocation according to the power allocation solution satisfying the condition.

Claims

1. A method of controlling power in a Base Station (BS) of a cellular system using wired Relay Stations (RSs), the method comprising:

the RSs and the BS individually performing scheduling of packets to be transmitted to Mobile Stations (MSs) in respective areas of coverage;

the BS increasing a difference between a sum of signals to be transmitted and a sum of interference signals according to a scheduling result, guaranteeing a minimum amount of data to be received by each MS, and calculating a power allocation solution of each MS, which satisfies a condition that the power allocation solution is in a range of allocatable power, which was pre-set by each of the RSs and the BS; and

the RSs and the BS performing sub-channel allocation and power allocation according to the power allocation solution satisfying the condition.

2. The method of claim 1, further comprising if no power allocation solution satisfying the condition exists, the RSs and the BS performing sub-channel allocation and allocation of a same power to each sub-channel.

3. The method of claim 1, wherein the BS increases the difference between the sum of signals to be transmitted and the sum of interference signals according to the scheduling result using the formula

4. The method of claim 1, wherein a transmission frame of each of the BS and the RSs is comprised of N sub-channels, the transmission frames comprised of N sub-channels are synchronized in a frequency domain and a time domain, a single channel is allocated to only a single MS, and schedulers allocate the same sub-channel to respective MSs at the same time.

5. A system for controlling power in a cellular system using wired Relay Stations (RSs), the system comprising:

a plurality of RSs for transmitting control information of Mobile Stations (MSs) in respective areas of coverage to a Base Station (BS), independently performing scheduling of packets to be transmitted to respective MSs using individual packet schedulers, performing channel coding, constellation mapping, and modulation of frames to be transmitted to the respective MSs, and transmitting the frames to the respective MSs; and

a BS for performing scheduling of packets to be transmitted to respective MSs in its area of coverage using individual packet schedulers, performing channel coding, constellation mapping, and modulation of frames to be transmitted to the respective MSs, transmitting the frames to the respective MSs, performing combined power allocation for the packets to be transmitted to the respective MSs, which were scheduled by respective RSs or the BS, based on the control information received from the plurality of RSs,

wherein each transmission frame of the BS and the RSs is comprised of N sub-channels, the transmission frames comprised of N sub-channels are synchronized in a frequency domain and a time domain, a single channel is allocated to only a single MS, and the schedulers allocate the same sub-channel to the respective MSs at the same time.

6. The system of claim 5, wherein the BS performs combined power allocation for the packets to be transmitted to the respective MSs by increasing a difference between a sum of signals to be transmitted and a sum of interference signals according to a scheduling result, guaranteeing a minimum amount of data to be received by each MS, and performing power allocation according to a power allocation solution of each MS, which satisfies a condition that the power allocation solution is in a range of allocatable power, which was pre-set by each of the RSs and the BS.

7. A base station (BS) in communication with a plurality of relay stations (RS), the base station comprising:

a processor in communication with a memory, the processor executing code for executing the steps of;

determine a combined power allocation for packets to be transmitted to respective mobile stations (MS) by increasing a difference between a sum of signals to be transmitted and a sum of interference signals according to a scheduling result,

guaranteeing a minimum amount of data to be received by each MS, and

performing power allocation according to a power allocation solution of each MS, which satisfies a condition that the power allocation solution is in a range of allocatable power, which was pre-set by each of the RSs and the BS.

8. The base station of claim 7, wherein the processor increases the difference between the sum of signals to be transmitted and the sum of interference signals according to the scheduling result using the formula

9. The base station of claim 7, wherein a transmission frame of each of the BS and the RSs is comprised of N sub-channels, the transmission frames comprised of N sub-channels are synchronized in a frequency domain and a time domain, a single channel is allocated to only a single MS, and schedulers allocate the same sub-channel to respective MSs at the same time.

10. The base station of claim 7, further comprising:

means for receiving control information of Mobile Stations (MSs) within each of the RS'"'"'s respective area of coverage.

11. A base station (BS) in communication with a plurality of relay stations (RS), the base station comprising:

means for determine a combined power allocation for packets to be transmitted to respective mobile stations (MS) by increasing a difference between a sum of signals to be transmitted and a sum of interference signals according to a scheduling result;

means for guaranteeing a minimum amount of data to be received by each MS; and

means for performing power allocation according to a power allocation solution of each MS, which satisfies a condition that the power allocation solution is in a range of allocatable power, which was pre-set by each of the RSs and the BS.

12. The base station of claim 11, wherein the increasing the difference between the sum of signals to be transmitted and the sum of interference signals according to the scheduling result using the formula

13. The base station of claim 11, wherein a transmission frame of each of the BS and the RSs is comprised of N sub-channels, the transmission frames comprised of N sub-channels are synchronized in a frequency domain and a time domain, a single channel is allocated to only a single MS, and schedulers allocate the same sub-channel to respective MSs at the same time.

14. The base station of claim 11, further comprising:

means for receiving control information of Mobile Stations (MSs) within each of the RS'"'"'s respective area of coverage.