Techniques and apparatuses for virtual radio link monitoring during carrier aggregation and cross-carrier scheduling

Patent metadata

Field	Value
Publication number	US-9949161-B2
Application number	US-201514925700-A
Country	US
Kind code	B2
Filing date	Oct 28, 2015
Priority date	Jul 31, 2015
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

Certain aspects of the present disclosure generally relate to wireless communications. In some aspects, a wireless communication device may determine that the wireless communication device is configured to use a primary component carrier (PCC), a first secondary component carrier (SCC), and a second SCC for carrier aggregation. A primary cell may be associated with the PCC, a first secondary cell may be associated with the first SCC, and a second secondary cell may be associated with the second SCC. The first secondary cell may provide control information for the second secondary cell. The wireless communication device may monitor at least one of the first SCC or the second SCC. The wireless communication device may perform an action associated with the second secondary cell based, at least in part, on monitoring the at least one the first SCC or the second SCC.

First claim

What is claimed is:

1. A method for wireless communication, comprising:
determining, by a wireless communication device, that the wireless communication device is configured to use a primary component carrier (PCC), a first secondary component carrier (SCC), and a second SCC for carrier aggregation, wherein a primary cell is associated with the PCC, a first secondary cell is associated with the first SCC, a second secondary cell is associated with the second SCC, and the first secondary cell provides scheduling information for the second secondary cell;
monitoring, by the wireless communication device, at least one of the first SCC or the second SCC;
detecting, by the wireless communication device, that a signal quality associated with the first SCC does not satisfy a threshold; and
deactivating, by the wireless communication device, the second secondary cell based, at least in part, on detecting that the signal quality associated with the first SCC does not satisfy the threshold.

2. The method of claim 1 , further comprising:
periodically activating the second secondary cell to determine channel state information associated with the second SCC; and
reporting the channel state information.

3. The method of claim 1 ,
wherein the deactivating, by the wireless communication device, the second secondary cell further comprises: deactivating the second secondary cell during a first time period;
the method further comprising:
activating the second secondary cell during a second time period that occurs after the first time period;
determining channel state information associated with the second SCC based, at least in part, on activating the second secondary cell during the second time period; and
reporting the channel state information associated with the second SCC.

4. The method of claim 3 , further comprising:
deactivating the second secondary cell during a third time period that occurs after the second time period; and
reporting the channel state information for a fourth time period that occurs after the second time period without activating the second secondary cell during the fourth time period,
wherein the second time period and the fourth time period are consecutive reporting periods.

5. The method of claim 1 , further comprising:
determining that the first secondary cell has been de-configured or deactivated based, at least in part, on monitoring the first SCC; and
deactivating the first secondary cell based, at least in part, on determining that the first secondary cell has been de-configured or deactivated.

6. A method for wireless communication, comprising:
determining, by a wireless communication device, that the wireless communication device is configured to use a primary component carrier (PCC), a first secondary component carrier (SCC), and a second SCC for carrier aggregation, wherein a primary cell is associated with the PCC, a first secondary cell is associated with the first SCC, a second secondary cell is associated with the second SCC, and the first secondary cell provides scheduling information for the second secondary cell;
monitoring, by the wireless communication device, at least one of the first SCC or the second SCC;
detecting that the wireless communication device has tuned away from the first SCC; and
deactivating the second secondary cell based, at least in part, on detecting that the wireless communication device has tuned away from the first SCC.

7. The method of claim 6 , further comprising:
determining that a tune-away time period, during which the wireless communication device is tuned away from the first SCC, satisfies a threshold;
activating the second secondary cell based, at least in part, on determining that the tune-away time period satisfies the threshold;
determining channel state information associated with the second SCC based, at least in part, on activating the second secondary cell; and
reporting the channel state information.

8. A method for wireless communication, comprising:
determining, by a wireless communication device, that the wireless communication device is configured to use a primary component carrier (PCC), a first secondary component carrier (SCC), and a second SCC for carrier aggregation, wherein a primary cell is associated with the PCC, a first secondary cell is associated with the first SCC, a second secondary cell is associated with the second SCC, and the first secondary cell provides scheduling information for the second secondary cell;
monitoring, by the wireless communication device, at least one of the first SCC or the second SCC;
detecting that a signal quality associated with the second SCC does not satisfy a threshold
determining a downlink reference time associated with another cell other than the second secondary cell based, at least in part, on detecting that the signal quality associated with the second SCC does not satisfy the threshold;
determining a timing advance for an uplink channel of the second secondary cell based, at least in part, on the downlink reference time; and
transmitting a communication via the uplink channel of the second secondary cell based, at least in part, on the timing advance.

9. The method of claim 8 ,
wherein detecting that the signal quality associated with the second SCC does not satisfy the threshold includes detecting a radio link failure associated with a downlink channel of the second secondary cell; and
wherein determining the downlink reference time includes determining the downlink reference time based, at least in part, on detecting the radio link failure.

10. The method of claim 8 , wherein the other cell is in a same timing advance group as the second secondary cell.

11. A method for wireless communication, comprising:
determining, by a wireless communication device, that the wireless communication device is configured to use a primary component carrier (PCC), a first secondary component carrier (SCC), and a second SCC for carrier aggregation, wherein a primary cell is associated with the PCC, a first secondary cell is associated with the first SCC, a second secondary cell is associated with the second SCC, and the first secondary cell provides scheduling information for the second secondary cell;
monitoring, by the wireless communication device, at least one of the first SCC or the second SCC;
detecting that the wireless communication device has tuned away from a downlink channel associated with the second SCC;
determining a downlink reference time associated with another cell other than the second secondary cell based, at least in part, on detecting that the wireless communication device has tuned away from the downlink channel;
determining a timing advance for an uplink channel of the second secondary cell based, at least in part, on the downlink reference time; and
transmitting a communication via the uplink channel of the second secondary cell based, at least in part, on the timing advance.

12. A wireless communication device for wireless communication, comprising:
one or more processors configured to:
determine that the wireless communication device is configured to use a primary component carrier (PCC), a first secondary component carrier (SCC), and a second SCC for carrier aggregation, wherein a primary cell is associated with the PCC, a first secondary cell is associated with the first SCC, a second secondary cell is associated with the second SCC, and the first secondary cell provides scheduling information for the second secondary cell;
monitor at least one of the first SCC or the second SCC;
detect that a signal quality associated with the first SCC does not satisfy a threshold; and
deactivate the

Assignees

• Qualcomm Inc

Inventors

• Mandil Amit
• Aminzadeh Gohari Amir
• Choi Won-Joon
• Yan Hongbo
• Yuan Rebecca Wen-Ling
• Zacharias Leena
• Pany Antriksh
• Khangura Sarabjot Singh

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/542

  using measured or perceived quality · CPC title

• H04W72/12

  Wireless traffic scheduling · CPC title

• H04L5/0098

  Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands · CPC title

• H04L5/006

  Quality of the received signal, e.g. BER, SNR, water filling · CPC title