Key performance indicator improvements in wireless communication

Patent metadata

Field	Value
Publication number	US-12302183-B2
Application number	US-202318475021-A
Country	US
Kind code	B2
Filing date	Sep 26, 2023
Priority date	Jul 2, 2019
Publication date	May 13, 2025
Grant date	May 13, 2025

Abstract

Techniques to maximize connectivity to a preferred radio access technology (RAT) (e.g., 5G NR) over a less preferred RAT (e.g., 4G LTE) are disclosed. When a user equipment (UE) is camped on a preferred RAT connectivity capable cell (e.g., NR cell, EUTRA dual-connectivity (ENDC) cell), offsets or biases may be applied to delay triggering of a cell reselection. When UE is camped on a non-preferred RAT connectivity capable cell, offset(s) may be applied to accelerate triggering of the cell reselection. When cell reselection is triggered, offsets or biases may be applied to favor reselection to preferred RAT connectivity capable cell over a non-preferred RAT connectivity capable cell.

First claim

What is claimed is:

1. A method performed by a network node of a network serving a user equipment (UE), the method comprising:
determining one or more reselection parameters defining biases to favor connectivity of the UE to a preferred radio access technology (RAT) connectivity capable cell over a non-preferred RAT connectivity capable cell when the UE performs a cell reselection from a current serving cell to a new serving cell, the one or more reselection parameters including one or more current serving cell reselection offsets and one or more new serving cell selection offsets; and
sending to the UE the one or more reselection parameters in one or more reconfiguration messages,
wherein the one or more reselection parameters are determined offline and/or determined based on minimization of drive test (MTD) reports,
wherein a preferred RAT connectivity capable cell refers to a preferred RAT capable cell or to a cell capable of providing connectivity to a preferred RAT capable cell, and
wherein when the current serving cell is not a preferred RAT connectivity capable cell, triggering of cell reselection is accelerated when the one or more current serving cell reselection offsets are considered than when the one or more current serving cell reselection offsets are not considered.

2. The method of claim 1 , wherein the preferred RAT connectivity capable cell is 5G New Radio (NR) capable or is EUTRA NR dual connectivity (ENDC) capable.

3. A method, performed by a network node of a network serving a user equipment (UE), the method comprising:
determining one or more reselection parameters defining biases to favor connectivity of the UE to a preferred radio access technology (RAT) connectivity capable cell over a non-preferred RAT connectivity capable cell when the UE performs a cell reselection from a current serving cell to a new serving cell, the one or more reselection parameters including one or more current serving cell reselection offsets and one or more new serving cell selection offsets; and
sending to the UE the one or more reselection parameters in one or more reconfiguration messages,
wherein the one or more reselection parameters are determined offline and/or determined based on minimization of drive test (MTD) reports,
wherein a preferred RAT connectivity capable cell refers to a preferred RAT capable cell or to a cell capable of providing connectivity to a preferred RAT capable cell,
wherein the one or more current serving cell reselection offsets comprise one or more measurement delay offsets and/or one or more measurement acceleration offsets,
one or more cell selection values of the current serving cell being initially determined based on one or more measurements at the UE of one or more signals transmitted from the current serving cell and based on one or more measurement criterion parameters,
the one or more initially determined cell selection values of the current serving cell being modified by the one or more measurement delay offsets when the current serving cell is preferred RAT connectivity capable;
the one or more initially determined cell selection values of the current serving cell being modified by the one or more measurement acceleration offsets when the current serving cell is not preferred RAT connectivity capable,
cell reselection being triggered when the one or more modified cell selection values are less than one or more measurement trigger thresholds, and

wherein when the one or more initial cell selection values of the current serving cell are modified by the measurement delay offset, the triggering of the cell reselection is delayed relative to when the one or more initial cell selection values of the current serving cell are modified by the measurement acceleration offset.

4. The method of claim 3 ,
wherein the one or more measurement criterion parameters are sent to the UE in one or more system information block (SIB) messages separate from sending the one or more reselection configuration messages,
wherein the one or more measurement criterion parameters comprise any one or more of Qrxlevmin, Qrxlevminoffset, PCompensation, Qqualmin, and Qqualminoffset,
wherein the one or more measurement trigger thresholds comprise any one or more of s-IntraSearchP, s-IntraSearchQ, s-NonIntraSearchP, and s-NonIntraSearchQ, and
wherein the one or more cell selection values comprise one or both of SrxLev and Squal.

5. The method of claim 1 ,
wherein the one or more new serving cell selection offsets comprise one or more positive selection offsets and one or more negative selection offsets applied to one or more neighbor cell selection values of one or more neighbor cells when the cell reselection is triggered,
for each neighbor cell, one or more cell selection values of that neighbor being initially determined at the UE based on one or more measurements at the UE of one or more signals from that neighbor cell and based on one or more measurement criterion parameters,
for each neighbor cell that is preferred RAT connectivity capable, the one or more positive selection offsets representing one or more modifications applied to the one or more initially determined cell selection values of that neighbor cell,
for each neighbor cell that is not preferred RAT connectivity capable, the one or more negative selection offset representing one or more modifications applied to the one or more initially determined cell selection values of that neighbor cell,

wherein for each neighbor cell that is preferred RAT connectivity capable, a likelihood of that neighbor cell being selected as the new serving cell is enhanced with application of the one or more positive selection offsets to the one or more cell selection values of that neighbor cell than without application of the one or more positive selection offsets, and
wherein for each neighbor cell that is not preferred RAT connectivity capable, a likelihood of that neighbor cell being selected as the new serving cell is reduced with application of the one or more negative selection offsets to the one or more cell selection values of that neighbor cell than without application of the one or more negative selection offsets.

6. The method of claim 5 , wherein each neighbor cell that is preferred RAT connectivity capable is prioritized to be selected as the new serving cell over each neighbor cell that is not preferred RAT connectivity capable.

7. A method of claim 1 , performed by a network node of a network serving a user equipment (UE), the method comprising:
determining one or more reselection parameters defining biases to favor connectivity of the UE to a preferred radio access technology (RAT) connectivity capable cell over a non-preferred RAT connectivity capable cell when the UE performs a cell reselection from a current serving cell to a new serving cell, the one or more reselection parameters including one or more current serving cell reselection offsets and one or more new serving cell selection offsets; and
sending to the UE the one or more reselection parameters in one or more reconfiguration messages,
wherein the one or more reselection parameters are determined offline and/or determined based on minimization of drive test (MTD) reports,
wherein a preferred RAT connectivity capable cell refers to a preferred RAT capable cell or to a cell capable of providing connectivity to a preferred RAT capable cell,
wherein the one or more reselection parameters are sent in one or more system information block (SIB) messages to the UE, the one or more reselection parameters including one or more evaluation offsets representing a basis of determining one or more selection values of the current serving cell when the current serving cell is preferred RAT connectivity capable, the one or more cell selec

Assignees

• Qualcomm Inc

Inventors

• Kumar Akash
• Bansal Hargovind Prasad

Classifications

• H04W36/30

  by measured or perceived connection quality data · CPC title

• H04W36/00837

  Determination of triggering parameters for hand-off · CPC title

• H04W36/008357

  Determination of target cell based on access point [AP] properties, e.g. AP service capabilities · CPC title

• H04W36/1443

  between licensed networks · CPC title

• H04W8/245

  from a network towards a terminal · CPC title