Method and apparatus for activating or deactivating secondary carriers in time division duplex mobile communication system using carrier aggregation

• US 9,730,224 B2
• Filed: 04/24/2015
• Issued: 08/08/2017
• Est. Priority Date: 02/21/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jang, Jaehyuk, Kim, Soenghun
• Primary Examiner(s): Elpenord, Candal
• Assistant Examiner(s): Duda, Adam
• Application Number:
  US14/695,642
• Publication Number:
  US 20150230253A1
• Time in Patent Office: 837 Days
• Field of Search: None
• 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 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0078 Timing of allocation
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• 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

Abstract

A method and an apparatus for activating or deactivating a primary carrier and secondary carriers in a Time Division Duplex Long Term Evolution (TDD LTE) system using carrier aggregation are provided. An apparatus includes an User Equipment employing the method corresponding the operation associated with the activation and deactivation of SCells, which thereby performs communication with eNBs without errors.

Claims

1. A method by a terminal in a mobile communication system using carrier aggregation (CA), the method comprising:

receiving an activation command for a secondary cell in subframe n, from a base station;

transmitting channel status information (CSI) for the secondary cell in subframe n+8; and

monitoring a downlink control channel for the secondary cell no earlier than the subframe n+8.

2. The method of claim 1, wherein the CSI includes a channel quality indicator (CQI).

3. The method of claim 1, wherein a time interval between receiving the activation command and transmitting the CSI is a time corresponding to 8 subframes.

4. The method of claim 1, further comprising:

activating a forward direction of the secondary carrier no earlier than the transmitting the CSI in the subframe n+8.

5. The method of claim 1, further comprising:

transmitting a sounding reference signal for the secondary cell no earlier than the subframe n+8.

6. The method of claim 5,

wherein the second information is transmitted no later than a first subframe, and

wherein the first subframe is different from the subframe n+8.

7. The method of claim 1, wherein the activation command is a medium access control element (MAC CE) for activation of the secondary cell.

8. The method of claim 7,

wherein the activation command contains a first field and at least one second field for the secondary cell, and

wherein the first field is reserved field and the second field indicates at least one secondary cell for activation.

9. The method of claim 8, wherein the MAC CE is 8 bit, the first field is 1 bit, and the second field is 7 bit.

10. A terminal in a mobile communication system using carrier aggregation (CA), the terminal comprising:

a transceiver configured to transmit and receive a signal; and

a controller configured to;

receive an activation command for a secondary cell in subframe n, from a base station,

transmit channel status information (CSI) for the secondary cell in subframe n+8, and

monitor a downlink control channel for the secondary cell no earlier than the subframe n+8.

11. The terminal of claim 10, wherein the CSI includes a channel quality indicator (CQI).

12. The terminal of claim 10, wherein a time interval between reception of the activation command and transmission of the CSI is a time corresponding to 8 subframes.

13. The terminal of claim 10, wherein the controller is further configured to activate a forward direction of the secondary carrier no earlier than the transmitting the CSI in the subframe n+8.

14. The terminal of claim 10, wherein the controller is further configured to transmit a sounding reference signal for the secondary cell no earlier than the subframe n+8.

15. The terminal of claim 10,

wherein the second information is transmitted no later than a first subframe, and

wherein the first subframe is different from the subframe n+8.

16. The terminal of claim 10, wherein the activation command is a medium access control element (MAC CE) for activation of the secondary cell.

17. The terminal of claim 16,

wherein the activation command contains a first field and at least one second field for the secondary cell, and

wherein the first field is reserved field and the second field indicates at least one secondary cell for activation.

18. The terminal of claim 17, wherein the MAC CE is 8 bit, the first field is 1 bit, and the second field is 7 bit.