METHOD AND APPARATUS FOR GENERATING FEEDBACK IN A COMMUNICATION SYSTEM

• US 20130088984A1
• Filed: 10/05/2012
• Published: 04/11/2013
• Est. Priority Date: 10/06/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Youn-Sun, Lee, Ju-Ho, Lee, Hyo-Jin
• Granted Patent: US 9,124,398 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 25/00 Baseband systems
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI

Abstract

A method and an apparatus are provided for generating feedback in a communication system. The method includes receiving information about first Evolved Node Bs (ENBs) and a threshold for the first ENBs, which are powered off at a specific time; measuring a channel status for each of second ENBs, which are subject to channel status measurement; selecting a third ENB having an optimal channel status from among the second ENBs, based on the measured channel statuses; generating first feedback information including a cell index and channel status information for the third ENB; measuring a channel status for each of the second ENBs, while the first ENBs are powered off; selecting a fourth ENB having an optimal channel status from among the second ENBs, based on the measured channel statuses; and generating second feedback information including a cell index and channel status information for the fourth ENB.

Claims

1. A method for generating feedback in a communication system, the method comprising:

receiving information about first Evolved Node Bs (ENBs) and a threshold for the first ENBs, which are powered off at a specific time;

measuring a channel status for each of second ENBs, which are subject to channel status measurement;

selecting a third ENB having an optimal channel status from among the second ENBs, based on the measured channel statuses;

generating first feedback information including a cell index and channel status information for the third ENB;

measuring a channel status for each of the second ENBs, while the first ENBs are powered off;

selecting a fourth ENB having an optimal channel status from among the second ENBs, based on the measured channel statuses; and

generating second feedback information including a cell index and channel status information for the fourth ENB.

2. The method of claim 1, wherein generating the second feedback information comprises configuring the second feedback information with the channel status information of the fourth ENB, which has a difference from the channel status information of the third ENB, if the first feedback information and the second feedback information are fed back in a same feedback period.

3. The method of claim 2, wherein generating the first feedback information comprises configuring the first feedback information to include the channel status information of the fourth ENB, which has a difference from the channel status information of the third ENB.

4. A method for receiving feedback in a communication system, the method comprising:

allocating resources for a signal for channel measurement for each of first Evolved Node Bs (ENBs) that transmit data to a User Equipment (UE) located at an edge of a first cell;

determining a threshold for second ENBs that are powered off at a specific time; and

transmitting, to the UE, the signal for channel measurement for each of the first ENBs, information about the second ENBs, and the threshold for the second ENBs.

5. The method of claim 4, wherein if first feedback information for third ENBs having an optimal channel status among the second ENBs and second feedback information for fourth ENBs having an optimal channel status among the channel statuses of the second ENBs, which are measured while the first ENBs are powered off, are received in a same feedback period, the second feedback information includes channel status information of the fourth ENBs, which has a difference from the channel status information of the third ENBs.

6. An apparatus for generating feedback in a communication system, the apparatus comprising:

a communication unit that receives information about first Evolved Node Bs (ENBs) and a threshold for the first ENBs, which are powered off at a specific time; and

a controller that measures a channel status for each of second ENBs, which are subject to channel status measurement, selects a third ENB having an optimal channel status from among the second ENBs, based on the measured channel statuses, generates first feedback information including a cell index and channel status information for the third ENB, measures a channel status for each of the second ENBs while the first ENBs are powered off, selects a fourth ENB having an optimal channel status from among the second ENBs, based on the measured channel statuses, and generates second feedback information including a cell index and channel status information for the fourth ENB.

7. The apparatus of claim 6, wherein the controller configures the second feedback information with the channel status information of the fourth ENB, which has a difference from the channel status information of the third ENB, if the first feedback information and the second feedback information are fed back in a same feedback period.

8. The apparatus of claim 7, wherein the controller configures the first feedback information to include the channel status information of the fourth ENB, which has a difference from the channel status information of the third ENB.

9. An apparatus for receiving feedback in a communication system, the apparatus comprising:

a controller that allocates resources for a signal for channel measurement for each of first Evolved Node Bs (ENBs) that transmit data to a User Equipment (UE) located at an edge of a first cell, and determines a threshold for second ENBs that are powered off at a specific time; and

a communication unit that transmits the signal for channel measurement for each of the first ENBs, information about the second ENBs, and the threshold for the second ENBs, to the UE, under control of the controller.

10. The apparatus of claim 9, wherein if first feedback information for third ENBs having an optimal channel status among the second ENBs and second feedback information for fourth ENBs having an optimal channel status among the channel statuses of the second ENBs, which are measured while the first ENBs are powered off, are received in a same feedback period, the second feedback information includes channel status information of the fourth ENBs, which has a difference from the channel status information of the third ENBs.