Methods and systems for in-device interference mitigation

Patent metadata

Field	Value
Publication number	US-9781735-B2
Application number	US-201113209383-A
Country	US
Kind code	B2
Filing date	Aug 13, 2011
Priority date	Aug 13, 2010
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

Methods and apparatus for mitigating in-device interference are described. The methods may include an in-device interference event (e.g. an interference situation), and the processing of events may depend on the priority of the technologies. A handover to another frequency or radio access technology (RAT) may occur in case a co-existing technology may be activated. The network may signal to the device a list of frequencies or RATs that it may be allowed to measure and handoff to. A network may provide a scaling value that the device may use to speed up reaction to the interference. The device may apply a scaling factor to an “out of synch’ counter and/or the radio link failure (RLF) timer used for the RLF procedure. The device may apply different scaling factors for the measurements and time to trigger events. The device may trigger a report to the network requesting gaps for an alternate RAT.

First claim

What is claimed:

1. A method for mitigating interference between radio access technology (RAT) components in a wireless device, the method comprising:
detecting, at the wireless device, an in-device interference situation between a first RAT component and a second RAT component of the wireless device, wherein at least one of the first or second RAT component is a long term evolution (LTE) technology component;
determining, at the wireless device, that at least one of the first or second RAT component is a victim of the in-device interference situation at one or more frequencies;
sending, from the wireless device, a notification of the detected in-device interference situation to an LTE network, wherein the notification comprises information for assisting with the detected in-device interference situation, the information indicating which of the first and/or second RAT component is a victim of the in-device interference situation and indicating the one or more frequencies at which the victim is interfered, the information further comprising one or more suggested parameters associated with a time division multiplexing (TDM) scheme to assist with the detected in-device interference situation; and
receiving, at the wireless device, configuration information based on sending the notification of the detected in-device interference situation, wherein the configuration information comprises information associated with a pattern for transmission and/or reception at the wireless device or a change of a pattern for transmission and/or reception at the wireless device.

2. The method of claim 1 , wherein the configuration information comprises at least an action or an indication thereof to be performed by the wireless device in response to the detected in-device interference situation to mitigate the detected in-device interference situation.

3. The method of claim 2 , further comprising performing at least one of the following: a handover for at least one of the first RAT or second RAT component; a time coordination between transmission or reception on at least one of the first RAT or second RAT component; a redirection to another frequency; an activation of the first RAT or second RAT component; a delayed activation of the first RAT or second RAT component; turning off the first RAT or second RAT component; turning on the first RAT or second RAT component; a denial of transmissions for at least one of the first or second RAT component; a move to a reduced uplink (UL) mode; and power scaling on a frequency band associated with the first RAT or second RAT component.

4. The method of claim 2 , further comprising performing at least one of the following in response to receiving the configuration information: applying a configuration for an in-device interfering event; processing information associated with a capability of a network; applying a scaling value; processing a new measurement configuration message; switching to a new frequency band; applying an activation delay for the first or second RAT component; starting the first or second RAT component; keeping the first RAT or second RAT component off; performing a handover; applying measurement control information; applying a reconfiguration; performing a discontinuous reception (DRX) operation; performing a frequency division multiplexing (FDM) operation; performing a TDM operation; performing a frequency division duplex (FDD) half duplex operation.

5. The method of claim 3 , wherein the handover comprises an inter-frequency handover.

6. The method of claim 3 , wherein the time coordination between transmission or reception on at least one of the first RAT or second RAT component comprises ensuring transmission of a radio signal on at least one of the first or second RAT components does not coincide with reception of another signal on at least one of the first or second RAT components.

7. The method of claim 3 , wherein the denial of transmissions is performed during paging and measurement periods.

8. The method of claim 3 , wherein the delayed activation of the first RAT or second RAT component is delayed based on at least one of the following: a service priority, an activity, or a procedure.

9. The method of claim 1 , wherein the in-device interference situation is detected based on or in response to one or more triggers.

10. The method of claim 9 , wherein the one or more triggers comprise at least one of the following: proactive triggers; reactive triggers; a handover being initiated; a change in a mode of operation; a change in a usage scenario change; a change in a service scenario change; an expiration of a timer; a generation of a predetermined load; and a size of a buffer.

11. The method of claim 10 , wherein the notification comprises at least one of the following: an indication the first RAT or second RAT component needs to be activated or is activated; an indication the first RAT or second RAT component needs to be turned or is turned on; information associated with the one or more triggers; information associated with technology types causing the in-device interference situation; an indication of a capability of the wireless device to handle the in-device interference situation; information associated with the first or second RAT component; usage scenario requested by the first RAT or second RAT component; service scenario requested by the first RAT or second RAT component; information associated with a timer; information associated with a mode of operation of the first RAT or second RAT component; an indication on when the first or second RAT should be turned on; measurements associated with the first RAT or second RAT component; a hopping frequency associated with the first RAT or second RAT component; a list of frequency supported by the first RAT or second RAT component; an indication of an urgency associated with turning on the first RAT or second RAT component; a request for assisted-global navigation satellite system (A-GNSS); information associated with a source cell; and information associated with a buffer size of the first RAT or second RAT component.

12. The method of claim 10 , wherein the reactive triggers are based on one or more events or one or more conditions.

13. The method of claim 12 , wherein the one or more events comprise an in-device knowledge that at least one of the first or second RAT components are active and causing interference.

14. The method of claim 12 , wherein the one or more conditions comprise at least one of the following: a reference signal received quality (RSRQ), a reference signal received power (RSRP), or a channel quality indicator (CQI).

15. The method of claim 10 , wherein, when the one or more triggers comprise the handover, the information for assisting with mitigation of the in-device interference situation is transferred to a target evolved NodeB (eNB) associated with the handover or the target eNB is made aware of the in-device interference situation.

16. The method of claim 10 , further comprising sending another notification after the handover takes place.

17. The method of claim 9 , wherein the one or more triggers comprise an interference scenario change.

18. The method of claim 17 , wherein the interference change scenario comprises the wireless device no longer experiencing the in-device interference situation.

19. The method of claim 1 , wherein the notification is sent via at least one of the following: via a radio resource control (RRC) connection establishment procedure, via a new field in a RRC message; via a RRC connection request message, v

Assignees

• Comsa Virgil
• Pani Diana
• Cave Christopher
• Terry Stephen E
• Gomes Sylvie
• Interdigital Patent Holdings Inc

Inventors

• Comsa Virgil
• Pani Diana
• Cave Christopher
• Terry Stephen E
• Gomes Sylvie

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W36/20

  for optimising the interference level · CPC title

• H04W72/1215 Primary

  for collaboration of different radio technologies · CPC title

• H04W88/06

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title

• H04W72/1284

  Electricity · mapped topic