Communication method using a carrier aggregation and apparatus therefore

• US 9,516,673 B2
• Filed: 12/10/2014
• Issued: 12/06/2016
• 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): Acolatse, Kodzovi
• Application Number:
  US14/566,540
• Publication Number:
  US 20150163038A1
• Time in Patent Office: 727 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 configured with multiple uplink component carriers in a wireless communications system. The method according to one embodiment includes transmitting, to the user equipment, Radio Resource Control (RRC) configuration information for a Sounding Reference Signal (SRS), the RRC configuration information including information for periodically receiving the SRS from the user equipment; transmitting, to the user equipment, Layer 2 (L2) control information indicating states of the plurality of uplink component carriers; and performing a procedure for periodically receiving the SRS from the user equipment on a corresponding uplink component carrier in use of the RRC configuration information. According to whether the corresponding uplink component carrier is in an available state or a non-available state at a time for receiving the SRS, the SRS or no SRS is received from the user equipment, respectively.

Claims

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

transmitting, to the user equipment, Radio Resource Control (RRC) configuration information for a Sounding Reference Signal (SRS), the RRC configuration information including information for periodically receiving the SRS from the user equipment; and

performing a procedure for periodically receiving the SRS from the user equipment on the second uplink component carrier of the multiple uplink component carriers in use of the RRC configuration information,

wherein, when the second uplink component carrier on which the SRS is periodically received is in an active state at a time for receiving the SRS, the SRS is received on the second uplink component carrier on which the SRS is periodically received, and, when the second uplink component carrier on which the SRS is periodically received is in a non-active state at a time for receiving the SRS, no SRS is received on the second uplink component carrier on which the SRS is periodically received,

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

wherein the active/non-active states of the second uplink component carrier are controlled by using layer 2 (L2) control information, and the second uplink component carrier and a second downlink component carrier paired with the second uplink component carrier have a same state among the active/non-active states; and

wherein the second uplink component carrier is in the non-active state, when all multiple downlink component carriers paired with the second uplink component carrier are in the non-active state.

2. The method of claim 1, wherein the uplink component carrier on which the SRS is periodically received is configured to allow an uplink signal reception from the user equipment in the active state, and the uplink component carrier on which the SRS is periodically received is configured not to allow an uplink signal reception from the user equipment in the non-active state.

3. A base station configured to receive an uplink transmission from a user equipment configured with multiple uplink component carriers including a first uplink component carrier and a second uplink 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 Sounding Reference Signal (SRS), the RRC configuration information including information for periodically receiving the SRS from the user equipment, and

perform a procedure for periodically receiving the SRS from the user equipment on the second uplink component carrier of the multiple uplink component carriers in use of the RRC configuration information,

wherein, when the second uplink component carrier on which the SRS is periodically received is in an active state at a time for receiving the SRS, the SRS is received on the second uplink component carrier on which the SRS is periodically received, and, when the second uplink component carrier on which the SRS is periodically received is in a non-active state at a time for receiving the SRS, no SRS is received on the second uplink component carrier on which the SRS is periodically received,

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

wherein the active/non-active states of the second uplink component carrier are controlled by using layer 2 (L2) control information, and the second uplink component carrier and a second downlink component carrier paired with the second uplink component carrier have a same state among the active/non-active states; and

wherein the second uplink component carrier is in the non-active state, when all multiple downlink component carriers paired with the second uplink component carrier are in the non-active state.

4. The base station of claim 3, wherein the uplink component carrier on which the SRS is periodically received is configured to allow an uplink signal reception from the user equipment in the active state, and the uplink component carrier on which the SRS is periodically received is configured not to allow an uplink signal reception from the user equipment in the non-active state.