Dominant interferer indication in access probe

Patent metadata

Field	Value
Publication number	US-9265048-B2
Application number	US-48362309-A
Country	US
Kind code	B2
Filing date	Jun 12, 2009
Priority date	Jul 11, 2008
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

Systems and methodologies are described that facilitate indicating a dominant interferer to a target serving base station in a wireless communication environment. A mobile device can detect presence or absence of a dominant interferer. Further, an access probe that includes information related to the presence or absence of the dominant interferer can be generated. For example, the information can be included in a payload of the access probe as an explicit flag, an explicit indication of an interference level, a Channel Quality Indicator (CQI) value (e.g., reserved versus non-reserved, . . . ), etc. Moreover, the access probe can be transmitted to the target serving base station to initiate an access procedure. The target serving base station can select a time-frequency resource to be utilized for a responsive downlink transmission (e.g. access grant signal, subsequent access related message, . . . ) as a function of the information included in the access probe.

First claim

What is claimed is:

1. A method, comprising:
identifying, at a mobile device, whether a dominant interferer is present within proximity of the mobile device, the dominant interferer being identified based at least in part on downlink interference measured by the mobile device;
measuring downlink interference levels associated with a set of resources of time interlaces or frequency subbands;
selecting at least one resource of a particular time interlace or of a particular frequency subband from the set based on the measured downlink interference levels;
generating an access probe that includes an interference indicator for indicating a presence of the dominant interferer, the access probe further including a resource indicator specifying the at least one resource of the particular time interlace or of the particular frequency subband, selected by the mobile device based on the measured downlink interference levels, on which to receive an access grant signal or a subsequent access related message from a target serving base station that is not currently serving the mobile device in response to the access probe; and
transmitting the access probe to the target serving base station to initiate an access procedure to connect the mobile device from a currently serving base station to the target serving base station, the target base station being selected based at least in part on a signal quality between the mobile device and the target base station.

2. The method of claim 1 , wherein the dominant interferer is a base station that causes downlink interference above a threshold as measured by the mobile device.

3. The method of claim 1 , further comprising identifying presence of the dominant interferer upon detecting that a first received downlink signal power corresponding to a first signal obtained from a non-serving base station is stronger than a second received downlink signal power corresponding to a second signal received from the target serving base station.

4. The method of claim 1 , further comprising determining an absence of the dominant interferer when a signal received from the target serving base station is detected to be associated with a highest received downlink signal power.

5. The method of claim 1 , further comprising conveying the interference indicator in at least part of a payload of the access probe.

6. The method of claim 5 , wherein the interference indicator is an explicit flag to indicate the presence or an absence of the dominant interferer.

7. The method of claim 5 , wherein the interference indicator is an explicit indication of an observed interference level.

8. The method of claim 5 , wherein the interference indicator is a reserved Channel Quality Indicator (CQI) value.

9. The method of claim 1 , further comprising selecting the target serving base station based upon at least received downlink signal power or path loss.

10. The method of claim 1 , further comprising generating the access probe for transmission to the target serving base station as a result of one or more of initial access by the mobile device, handoff initiated by the mobile device, radio link failure, network initiated handoff, or a combination thereof.

11. A wireless communications apparatus, the wireless communication apparatus being a mobile device, comprising:
at least one processor configured to:
detect, at the mobile device, a dominant interferer based upon downlink interference measured by the mobile device;
monitor downlink interference levels associated with a set of downlink time-frequency resources;
select at least one downlink time-frequency resource from the set based on the monitored downlink interference levels;
generate an access probe that includes an interference indicator for indicating a presence of the dominant interferer, the access probe further including a resource indicator specifying the at least one downlink time-frequency resource, selected by the mobile device based on the monitored downlink interference levels, on which to receive an access grant signal or a subsequent access related message from a target serving base station that is not currently serving the mobile device in response to the access probe; and
transmit the access probe to the target serving base station to initiate an access procedure to connect the mobile device from a currently serving base station to the target serving base station, the target base station being selected based at least in part on a signal quality between the mobile device and the target base station.

12. The wireless communications apparatus of claim 11 , wherein the interference indicator is an explicit flag in a payload of the access probe.

13. The wireless communications apparatus of claim 11 , wherein the interference indicator is an explicit indication of an observed interference level.

14. The wireless communications apparatus of claim 11 , wherein the interference indicator is a Channel Quality Indicator (CQI) value, the CQI value is a reserved CQI value to signify presence of the dominant interferer or set to a non-reserved CQI value to specify absence of the dominant interferer.

15. The wireless communications apparatus of claim 11 , in which the at least one processor is further configured to:
select the target serving base station based upon one or more of received downlink signal power, path loss, or a combination thereof.

16. An apparatus, the apparatus being a mobile device, comprising:
means for determining whether a dominant interferer is within proximity of the mobile device, the dominant interferer being identified based at least in part on downlink interference measured by the mobile device;
means for measuring downlink interference levels associated with a set of downlink time-frequency resources;
means for selecting at least one downlink time-frequency resource from the set based on the measured downlink interference levels;
means for generating an access probe that includes an interference indicator for indicating a presence of the dominant interferer, the access probe further including a resource indicator specifying the at least one downlink time-frequency resource, selected by the mobile device based on the measured downlink interference levels, on which to receive an access grant signal or a subsequent access related message from a target serving base station that is not currently serving the mobile device in response to the access probe; and
means for transmit the access probe to the target serving base station to initiate an access procedure to connect the mobile device from a currently serving base station to the target serving base station, the target base station being selected based at least in part on a signal quality between the mobile device and the target base station.

17. The apparatus of claim 16 , wherein the interference indicator is an explicit flag in a payload of the access probe.

18. The apparatus of claim 16 , wherein the interference indicator is an explicit indication of an observed interference level.

19. The apparatus of claim 16 , wherein the interference indicator is a Channel Quality Indicator (CQI) value, the CQI value is a reserved CQI value to signify presence of the dominant interferer or set to a non-reserved CQI value to specify absence of the dominant interferer.

20. The apparatus of claim 16 , further comprising means for selecting to access the target serving base station from a set of potentially accessible base stations.

21. The apparatus method of claim 1 , wherein

Assignees

• Sampath Ashwin
• Khandekar Aamod D
• Gorokhov Alexei Y
• Borran Mohammad J
• Bhushan Naga
• Palanki Ravi
• Qualcomm Inc

Inventors

• Sampath Ashwin
• Khandekar Aamod D
• Gorokhov Alexei Y
• Borran Mohammad J
• Bhushan Naga
• Palanki Ravi

Classifications

• H04W72/541 Primary

  using the level of interference · CPC title

• H04W28/26

  Resource reservation · CPC title

• H04B17/345

  Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W72/082 Primary

  Electricity · mapped topic