Proactive rank index management in SLTE enabled modem to achieve higher throughput

Patent metadata

Field	Value
Publication number	US-9848408-B2
Application number	US-201414272260-A
Country	US
Kind code	B2
Filing date	May 7, 2014
Priority date	Nov 12, 2013
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be a UE which uses a first antenna and a second antenna for communication with a first RAT. The apparatus determines that the second antenna is to be used for a procedure associated with a second RAT at a first time. The apparatus reduces a UE RI from an initial value to a reduced value for the communication with the first RAT at the first time based on the determination.

First claim

What is claimed is:

1. A method of wireless communication, comprising:
determining, by a user equipment (UE) using a first antenna and a second antenna for communication via a first radio access technology (RAT), that the second antenna is to be used for a procedure associated with a second RAT at a first time;
reducing, by the UE and before the first time, a UE rank index (RI) from an initial value to a reduced value for the communication with the first RAT at the first time based on the determination that the second antenna is to be used for the procedure associated with the second RAT at the first time; and
updating, upon reducing the UE RI from the initial value to the reduced value, by the UE and before the first time, at least one of a channel quality indicator (CQI) or a pre-coding matrix indicator (PMI) based on the reduced value of the UE RI.

2. The method of claim 1 , wherein the second antenna is unavailable for communication with the first RAT while the second antenna is used for the procedure associated with the second RAT.

3. The method of claim 1 , further comprising:
transmitting a request to a network entity to reduce the UE RI to the reduced value before the first time;
tuning away the second antenna from the first RAT to the second RAT to perform the procedure associated with the second RAT when the UE receives an acknowledgement in response to the transmission; and
performing communication with the first RAT via the first antenna according to the reduced value of the UE RI when the UE receives the acknowledgement in response to the transmission.

4. The method of claim 3 , further comprising:
refraining from the tuning away the second antenna from the first RAT to the second RAT and reverting the UE RI to the initial value when the UE does not receive the acknowledgement from the network entity.

5. The method of claim 4 , further comprising:
transmitting a subsequent instance of the request to the network entity to reduce the UE RI to the reduced value of the UE RI after the first time when the UE does not receive the acknowledgement;
tuning away the second antenna from the first RAT to the second RAT to perform the procedure associated with the second RAT when the UE does not receive an acknowledgement of the subsequent instance of the request from the network entity; and
performing communication with the first RAT via the first antenna according to the reduced value of the UE RI.

6. The method of claim 5 , wherein the subsequent instance of the request is transmitted to the network entity at an earlier subframe than a subframe at which the request before the subsequent instance of the request is transmitted to the network.

7. The method of claim 3 , further comprising:
transmitting a request to the network entity to return to the initial value of the UE RI after the procedure associated with the second RAT is performed; and
performing communication with the first RAT via the first antenna and the second antenna according to the initial value of the UE RI when the UE receives an acknowledgement from the network entity in response to the transmission of the request to return to the initial value of the UE RI.

8. The method of claim 7 , wherein the transmitting the request to the network entity to return to the initial value comprises:
transmitting the request to the network entity to return to the initial value of the UE RI at a later one of a time at which a sleep time associated with the first RAT ends and a time at which performance of the procedure associated with the second RAT ends.

9. The method of claim 3 , wherein the transmitting comprises:
transmitting the request to the network entity before the first time when the procedure associated with the second RAT begins before a start of a sleep time associated with the first RAT and overlaps at least in part with the sleep time associated with the first RAT; or
transmitting the request to the network entity before a start of a sleep time associated with the first RAT when the procedure associated with the second RAT begins after the start of the sleep time associated with the first RAT and overlaps at least in part with the sleep time associated with the first RAT.

10. The method of claim 3 , wherein transmitting the request to the network entity to reduce the UE RI to the reduced value includes transmitting the request to the network entity via at least one of a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH).

11. The method of claim 3 , further comprising determining, by the UE, whether the acknowledgement is received in response to transmitting the request to the network entity to reduce the UE RI to the reduced value.

12. An apparatus for wireless communication, wherein the apparatus is a user equipment (UE) using a first antenna and a second antenna for communication via a first radio access technology (RAT), the apparatus comprising:
a memory; and
at least one processor coupled to the memory and configured to:
determine that the second antenna is to be used for a procedure associated with a second RAT at a first time;
reduce, before the first time, a UE rank index (RI) from an initial value to a reduced value for the communication with the first RAT at the first time based on the determination that the second antenna is to be used for the procedure associated with the second RAT at the first time; and
update, upon reducing the UE RI from the initial value to the reduced value, before the first time, at least one of a channel quality indicator (CQI) or a pre-coding matrix indicator (PMI) based on the reduced value of the UE RI.

13. The apparatus of claim 12 , wherein the second antenna is unavailable for communication with the first RAT while the second antenna is used for the procedure associated with the second RAT.

14. The apparatus of claim 12 , wherein the at least one processor is further configured to:
transmit a request to a network entity to reduce the UE RI to the reduced value before the first time;
tune away the second antenna from the first RAT to the second RAT to perform the procedure associated with the second RAT when the UE receives an acknowledgement in response to the transmission; and
perform communication with the first RAT via the first antenna according to the reduced value of the UE RI when the UE receives the acknowledgement in response to the transmission.

15. The apparatus of claim 14 , wherein the at least one processor is further configured to:
refrain from the tuning away the second antenna from the first RAT to the second RAT and reverting the UE RI to the initial value when the UE does not receive the acknowledgement from the network entity.

16. The apparatus of claim 15 , wherein the at least one processor is further configured to:
transmit a subsequent instance of the request to the network entity to reduce the UE RI to the reduced value of the UE RI after the first time when the UE does not receive the acknowledgement;
tune away the second antenna from the first RAT to the second RAT to perform the procedure associated with the second RAT when the UE does not receive an acknowledgement of the subsequent instance of the request from the network entity; and
perform communication with the first RAT via the first antenna according to the reduced value of the UE RI.

17. The apparatus of claim 16 , wherein the subsequent instance of the request is transmitted to the network entity at an earlier subframe than a subframe at which the request before the subsequent instance of the request is transmitte

Assignees

• Qualcomm Inc

Inventors

• Sahu Debesh Kumar
• Gude Venkata Siva Prasad Rao
• Vadlamudi Venkata Girish
• Shah Chintan Shirish
• Mandil Amit
• Gottipati Praveen Kumar

Classifications

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title

• H04B7/0632

  Channel quality parameters, e.g. channel quality indicator [CQI] · CPC title

• H04W72/02 Primary

  Selection of wireless resources by user or terminal · CPC title

• H04B7/0693

  switching off a diversity branch, e.g. to save power · CPC title

• H04B7/0877

  switching off a diversity branch, e.g. to save power · CPC title