Inter-rat (radio access technology) and intra-rat measurement reporting

Patent metadata

Field	Value
Publication number	US-2016353340-A1
Application number	US-201514802897-A
Country	US
Kind code	A1
Filing date	Jul 17, 2015
Priority date	May 29, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

A measurement report may trigger a handover based on relative signal strengths of a serving cell and an intra/inter-RAT (radio access technology) neighbor cell. This may result in a UE being handed over to a weak cell and cause a voice call to drop. A method of wireless communication includes determining whether to delay sending an inter-RAT or an intra-RAT measurement report based in part on a current status of a call setup and whether the UE and a network support an inter-RAT handover while in the current status of the call setup. The measurement report is delayed for a predetermined time period based in part on the determination. The method also includes sending the measurement report when the predetermined time period expire and/or the current status of the call setup changes to a new status when both the UE and the network support the inter-RAT handover.

First claim

What is claimed is:

1 . A method of wireless communication at a user equipment (UE) during a call setup, comprising:
determining whether to delay sending an inter-RAT (radio access technology) measurement report or an intra-RAT measurement report based at least in part on a current status of the call setup and whether both the UE and a network support an inter-RAT handover while in the current status of the call setup, a network being a serving network or a target network; delaying sending the intra-RAT measurement report for an intra-RAT measurement report holding time period and/or an inter-RAT measurement report for an inter-RAT measurement report holding time period based at least in part on the determination; and sending the intra-RAT measurement report and/or the inter-RAT measurement report when the intra-RAT measurement report holding time period and/or the inter-RAT measurement report holding time period expire and/or the current status of the call setup changes to the new current status of the call setup in which both the UE and the network support the inter-RAT handover.

2 . The method of claim 1 , in which determining is further based on at least one of:
whether a signal quality of a current serving cell is above a first UE-defined absolute threshold and whether the signal quality of a neighbor cell is above a second UE-defined absolute threshold; and whether the current serving cell of a first RAT or the neighbor cell of a second RAT provides a better QoS (quality of service) to an active service or application running at the UE.

3 . The method of claim 2 , further comprising:
adjusting the first UE-defined absolute threshold and/or the second UE-defined absolute threshold based at least in part on one of a UE speed, a UE receiver performance, a serving cell radio frequency (RF) variation trend, and application quality of service (QoS) specifications; and adjusting the inter-RAT measurement report holding time period and/or the intra-RAT measurement report holding time period based at least in part on one of the UE speed, a current serving cell RF variation trend, a number of intra and/or inter-frequency neighbors, application QoS specifications and a percentage of call setup completion.

4 . The method of claim 2 , further comprising:
delaying sending the intra-RAT measurement report when the signal quality of the current serving cell is above the first UE-defined absolute threshold and an intra-RAT neighbor cell signal quality is below the second UE-defined absolute threshold.

5 . The method of claim 2 , further comprising:
sending the intra-RAT measurement report when the signal quality of the current serving cell becomes lower than the first UE-defined absolute threshold and the signal quality of an intra-RAT neighbor cell becomes higher than the second UE-defined absolute threshold.

6 . The method of claim 2 , further comprising:
sending the inter-RAT measurement report when both the UE and the network support the inter-RAT handover while in the current status of the call setup and the signal quality of each of the current serving cell and an intra-RAT neighbor cell become lower than the first UE-defined absolute threshold.

7 . The method of claim 2 , further comprising:
delaying sending the intra-RAT measurement report when a signal quality difference between the current serving cell and an intra-RAT neighbor cell is below a UE-defined relative threshold; and sending the intra-RAT measurement report when the signal quality difference between the current serving cell and an intra-RAT neighbor cell is above a relative threshold.

8 . The method of claim 1 , further comprising:
delaying sending the inter-RAT measurement report when a current call is in the call setup or when at least one of the UE, the serving network or the target network do not support the inter-RAT handover during the call setup.

9 . The method of claim 1 , further comprising:
reducing a frequency of inter-RAT measurements when at least one of the UE, the serving network and the target network does not support the inter-RAT handover while in the current status of the call setup.

10 . The method of claim 1 , in which the current status of the call setup comprises one of: alerting, pre-alerting, before default bearer establishment for signaling, after default bearer establishment for signaling, before dedicated bearer establishment for traffic and after dedicated bearer establishment for traffic.

11 . An apparatus for wireless communication, comprising:
a memory; a transceiver configured to communicate with a network; at least one processor coupled to the memory, the at least one processor being configured:
to determine whether to delay sending an inter-inter-radio access technology (RAT) measurement report or an intra-RAT measurement report based at least in part on a current status of a call setup and whether a UE and a network support an inter-RAT handover while in the current status of the call setup, a network being a serving network or a target network;
to delay sending the intra-RAT measurement report for an intra-RAT measurement report holding time period and/or the inter-RAT measurement report for an inter-RAT measurement report holding time period based at least in part on the determination; and
to send the intra-RAT measurement report and/or the inter-RAT measurement report when the intra-RAT measurement report holding time period and/or the inter-RAT measurement report holding time period expire and/or the current status of the call setup changes to the new current status of the call setup in which both the UE and the network support the inter-RAT handover.

12 . The apparatus of claim 11 , in which determining is further based on at least one of:
whether a signal quality of a current serving cell is above a first UE-defined absolute threshold and whether the signal quality of a neighbor cell is above a second UE-defined absolute threshold; and whether the current serving cell of a first RAT or the neighbor cell of a second RAT provides a better QoS (quality of service) to an active service or application running at the UE.

13 . The apparatus of claim 12 , in which the at least one processor is further configured:
to adjust the first UE-defined absolute threshold and/or the second UE-defined absolute threshold based at least in part on one of a UE speed, a UE receiver performance, a serving cell radio frequency (RF) variation trend, and application quality of service (QoS) specifications; and to adjust the inter-RAT measurement report holding time period and/or the intra-RAT measurement report holding time period based at least in part on one of the UE speed, a current serving cell RF variation trend, a number of intra and/or inter-frequency neighbors, application QoS specifications and a percentage of call setup completion.

14 . The apparatus of claim 12 , in which the at least one processor is further configured:
to delay sending the intra-RAT measurement report when the signal quality of the current serving cell is above the first UE-defined absolute threshold and the of an intra-RAT neighbor cell signal quality is below the second UE-defined absolute threshold.

15 . The apparatus of claim 12 , in which the at least one processor is further configured:
to send the intra-RAT measurement report when the signal quality of the current serving cell becomes lower than the first UE-defined absolute threshold and the signal quality of an intra-RAT neighbor cell becomes higher than the second UE-defined absolute threshold.

16 . The apparatus of

Assignees

• Qualcomm Inc

Inventors

• Yang Ming
• Chin Tom

Classifications

• H04W36/0083

  Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists · CPC title

• H04W88/06

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

• H04W36/0066 Primary

  of control information between different types of networks in order to establish a new radio link in the target network · CPC title

• H04W36/30

  by measured or perceived connection quality data · CPC title

• H04W36/1443

  between licensed networks · CPC title