Communication method for active and non-active carriers using carrier aggregation and an apparatus therefore

• US 9,391,753 B2
• Filed: 12/10/2014
• Issued: 07/12/2016
• Est. Priority Date: 06/08/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yang, Suck Chel, Seo, Dong Youn, Kim, Min Gyu, Ahn, Joon Kui, Lee, Jung Hoon
• Primary Examiner(s): Elliott, IV, Benjamin H
• Assistant Examiner(s): Nowlin, Eric
• Application Number:
  US14/566,569
• Publication Number:
  US 20150092730A1
• Time in Patent Office: 580 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• 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
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method for a base station to receive an uplink transmission from a user equipment. The method according to one embodiment includes transmitting, to the user equipment, Radio Resource Control (RRC) configuration information for channel status report, the RRC configuration information including information for periodically receiving channel status report from the user equipment; transmitting, to the user equipment, Layer 2 (L2) control information indicating states of the plurality of downlink component carriers, each of the plurality of downlink component carriers being indicated as one of an active state and a non-active state; and performing a procedure for periodically receiving channel status report for a corresponding downlink component carrier from the user equipment in use of the RRC configuration information. According to whether the corresponding downlink component carrier is in the active state or the non-active state at a time for receiving a channel status report, channel status information or no channel status information is received for the corresponding downlink component carrier from the user equipment at the time, respectively.

Claims

1. A method for a base station to receive an uplink transmission from a user equipment configured with multiple downlink component carriers including a first downlink component carrier and a second downlink component cattier in a wireless communications system, the method comprising:

transmitting, to the user equipment, Radio Resource Control (RRC) configuration information for a channel status report, the RRC configuration information including information for periodically receiving the channel status report from the user equipment; and

performing a procedure for periodically receiving channel status information for a downlink component carrier of the multiple downlink component carriers from the user equipment in use of the RRC configuration information,

wherein, for the downlink component carrier in an active state at a time for receiving the channel status information, the channel status information for the downlink component carrier is received at the time for receiving the channel status information,

wherein, for the downlink component carrier in a non-active state at a time for receiving the channel status information, no channel status information for the downlink component carrier is received at the time for receiving the channel status information,

wherein the first downlink component carrier is paired with a first uplink component carrier, and the first downlink and uplink component carriers are always in the active state, and

wherein the active/non-active states of the second downlink component carrier are controlled by using Layer 2 (L2) control signaling.

2. The method of claim 1, wherein the channel status information for the downlink component carrier is received on a specific uplink component carrier, and the specific uplink component carrier is an uplink component carrier configured for channel status reports of all configured downlink component carriers.

3. The method of claim 2, wherein the specific uplink component carrier is the first uplink component earner.

4. The method of claim 1, wherein the channel status information includes a Channel Quality Indicator (CQI).

5. A base station configured to receive an uplink transmission from a user equipment configured with multiple downlink component carriers including a first downlink component carrier and a second downlink component carrier in a wireless communications system, the base station comprising:

a radio frequency (RF) unit; and

a processor configured to;

transmit, to the user equipment, Radio Resource Control (RRC) configuration information for a channel status report, the RRC configuration information including information for periodically receiving the channel status report from the user equipment, and

perform a procedure for periodically receiving channel status information for a downlink component carrier of the multiple downlink component carriers from the user equipment in use of the RRC configuration information,

wherein, for the downlink component carrier in an active state at a time for receiving the channel status information, the channel status information for the downlink component carrier is received at the time for receiving the channel status information,

wherein, for the downlink component carrier in a non-active state at a time for receiving the channel status information, no channel status information for the downlink component carrier is received at the time for receiving the channel status information,

wherein the first downlink component carrier is paired with a first uplink component carrier, and the first downlink and uplink component carriers are always in the active state, and

wherein the active/non-active states of the second downlink component carrier are controlled by using Layer 2 (L2) control signaling.

6. The base station of claim 5, wherein the channel status information for the downlink component carrier is received on a specific uplink component carrier, and the specific uplink component carrier is an uplink component carrier configured for channel status reports of all configured downlink component carriers.

7. The base station of claim 6, wherein the specific uplink component carrier is the first uplink component carrier.

8. The base station of claim 5, wherein the channel status information includes a Channel Quality Indicator (CQI).