Multiple carrier activation/deactivation in wireless communications

Patent metadata

Field	Value
Publication number	US-9584290-B2
Application number	US-95335610-A
Country	US
Kind code	B2
Filing date	Nov 23, 2010
Priority date	Dec 8, 2009
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

Systems, methods and apparatuses are provided that facilitate selecting resources, such as time slots, subframes, etc., for performing bandwidth switching related to activating and/or deactivating one or more carriers. A data portion of one or more subframes can be selected for performing bandwidth switching. In addition, a device can determine whether one or more downlink grants are received in the one or more subframes, and can avoid selecting such subframes. The device can alternatively perform the bandwidth switching and request retransmission of the data portion. Additionally or alternatively, the device can determine a type of the one or more subframes and/or signals transmitted in the one or more subframes to determine whether to perform bandwidth switching in the subframes. The bandwidth switching can include changing a sampling rate, reconfiguring frequency filters, modifying a local oscillator, etc.

First claim

What is claimed is:

1. A method of wireless communication, comprising:
determining modification of an activation state of one or more carriers;
initializing a timer upon the determining modification of the activation state;
selecting, following expiration of the timer, a portion of one or more time slots for performing bandwidth switching based at least in part on the determining of the modification and on one or more types and/or purposes of the one or more time slots; and
performing bandwidth switching during the portion of the one or more time slots.

2. The method of claim 1 , wherein the selecting of the portion of the one or more time slots comprises selecting one or more subframes.

3. The method of claim 2 , wherein the selecting of the portion of the one or more subframes comprises selecting the portion corresponding to a data portion of the one or more subframes.

4. The method of claim 3 , further comprising receiving an indication of a portion of one or more data symbols within a given subframe to utilize for bandwidth switching from a base station, wherein the selecting of the portion of the one or more subframes further comprises selecting the data portion based at least in part on the indication of the portion of the one or more data symbols.

5. The method of claim 3 , further comprising:
determining a subframe for which no downlink grant is received before expiration of the timer, wherein the selecting of the portion of the one or more subframes comprises selecting the portion from the subframe for which no downlink grant is received.

6. The method of claim 2 , further comprising determining a number of consecutive subframes for performing bandwidth switching, wherein the selecting of the portion of the one or more subframes comprises selecting the portion of the one or more subframes to correspond to at least the number of consecutive subframes.

7. The method of claim 2 , further comprising requesting retransmission of data related to the one or more subframes based at least in part on control data in the one or more subframes.

8. The method of claim 2 , further comprising determining control data in the one or more subframes, wherein the selecting of the portion of the one or more subframes is based at least in part on the control data.

9. The method of claim 2 , further comprising determining that the one or more subframes comprise at least one multimedia broadcast over single frequency network (MBSFN) subframe, wherein the selecting of the portion of the one or more subframes is based at least in part on determining that the one or more subframes comprise the at least one MBSFN subframe.

10. The method of claim 2 , further comprising determining that one or more types of signals are not transmitted in the one or more subframes, wherein the selecting of the portion of the one or more subframes is based at least in part on determining that the one or more types of signals are not transmitted in the one or more subframes.

11. The method of claim 10 , wherein the one or more types of signals relate to at least one of timing advance commands, synchronization signals, or system information blocks.

12. The method of claim 2 , further comprising determining whether to transmit control data in the one or more subframes, wherein the selecting of the portion of the one or more subframes is based at least in part on determining not to transmit control data in the one or more subframes.

13. The method of claim 2 , wherein the performing bandwidth switching comprises at least one of changing a sampling rate, reconfiguring frequency filters, or retuning a local oscillator to a different frequency.

14. The method of claim 1 , further comprising determining that the one or more time slots correspond to a time slot for powering on a receiver in time division duplexed communications, wherein the selecting the one or more time slots is based at least in part on the determining that the one or more time slots correspond to the time slot for powering on the receiver.

15. An apparatus for activating or deactivating configured carriers in wireless communications, comprising:
at least one processor configured to:
detect modification of an activation state of one or more carriers;
initialize a timer upon the determining modification of the activation state;
select, following expiration of the timer, a portion of one or more time slots for performing bandwidth switching based at least in part on the modification of the activation state and on one or more types and/or purposes of the one or more time slots; and
switch bandwidth during the portion of the one or more time slots; and
a memory coupled to the at least one processor.

16. The apparatus of claim 15 , wherein the one or more time slots correspond to one or more subframes.

17. The apparatus of claim 16 , wherein the portion of the one or more subframes is a data portion of the one or more subframes.

18. The apparatus of claim 17 , wherein the at least one processor is further configured to receive an indication of a portion of one or more data symbols in a given subframe to utilize for bandwidth switching from a base station, and the at least one processor selects the portion of the one or more subframes based at least in part on the portion of the one or more data symbols.

19. The apparatus of claim 16 , wherein the at least one processor is further configured to determine a number of consecutive subframes for switching bandwidth, and the at least one processor selects the portion of the one or more subframes according to the number of consecutive subframes.

20. The apparatus of claim 16 , wherein the at least one processor is further configured to request retransmission of data related to the one or more subframes based at least in part on control data in the one or more subframes.

21. The apparatus of claim 16 , wherein the at least one processor is further configured to determine control data in the one or more subframes, and the at least one processor selects the portion of the one or more subframes based at least in part on the control data.

22. The apparatus of claim 16 , wherein the at least one processor is further configured to determine that the one or more subframes are multimedia broadcast over single frequency network (MBSFN), and the at least one processor selects the portion of the one or more subframes based at least in part on determining the one or more subframes are MBSFN.

23. The apparatus of claim 16 , wherein the at least one processor is further configured to determine that one or more types of signals are not transmitted in the one or more subframes, wherein the at least one processor selects the portion of the one or more subframes based at least in part on determining that the one or more types of signals are not transmitted in the one or more subframes.

24. The apparatus of claim 16 , wherein the at least one processor is further configured to determine whether to transmit control data in the one or more subframes, wherein the at least one processor selects the portion of the one or more subframes based at least in part on determining not to transmit control data in the one or more subframes.

25. The apparatus of claim 16 , wherein the at least one processor switches bandwidth at least in part by changing a sampling rate, reconfiguring frequency filters, or retuning a local oscillator to a different frequency.

26. The appa

Assignees

• Prakash Rajat
• Damnjanovic Jelena M
• Gaal Peter
• Agashe Parag Arun
• Gheorghiu Valentin Alexandru
• Kitazoe Masato
• Palanki Ravi
• Qualcomm Inc

Inventors

• Prakash Rajat
• Damnjanovic Jelena M
• Gaal Peter
• Agashe Parag Arun
• Gheorghiu Valentin Alexandru
• Kitazoe Masato
• Palanki Ravi

Classifications

• H04L5/0087

  when data requirements change · CPC title

• H04L5/0037

  Inter-user or inter-terminal allocation · CPC title

• H04L5/0023

  Time-frequency-space · CPC title

• H04W72/00

  Local resource management · CPC title

• H04W72/02

  Selection of wireless resources by user or terminal · CPC title