# US 11,310,715 B2 · Relaxation of mobility condition based on serving cell quality

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- Number: US 11,310,715 B2
- Document ID: US11310715B2
- Status: Granted
- Kind: B2
- Application number: 16/800,990
- Filed: 2020-02-25
- Published: 2020-08-27
- Granted: 2022-04-19
- Earliest claimed: 2019-02-26
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Sangwon Kim; Youngdae Lee; Sunghoon Jung; Hongsuk Kim
- Web page: https://patentgrep.com/patent/US11310715B2

## CPC

- H04W 36/0085: {Hand-off measurements}
- H04W 76/19: Connection re-establishment
- H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC]
- H04W 36/362: {Conditional handover}
- H04W 48/20: Selecting an access point
- H04W 76/11: Allocation or use of connection identifiers
- H04W 76/15: Setup of multiple wireless link connections
- H04W 80/02: Data link layer protocols
- H04W 4/12: Messaging; Mailboxes; Announcements
- H04W 4/90: Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
- H04W 36/305: {Handover due to radio link failure (control signalling for hand-off failure H04W36/0079)}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/0838: using contention-free random access [CFRA]
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method and apparatus for relaxation of mobility condition based on serving cell quality is provided. A wireless device, which has been configured with conditional mobility, performs a conditional mobility to a target cell by using a mobility condition related to the target cell upon detecting a radio link problem on a serving cell.

## Claims

### Claim 1

A method performed by a wireless device operating in a wireless communication system, the method comprising:
receiving, from a network, a conditional mobility configuration including one or more conditional mobility conditions for one or more target cells, wherein the one or more conditional mobility conditions are configured based on one of 1) a comparison between a measurement relating to each of the one or more target cells and a measurement relating to a serving cell, or 2) comparison between a measurement relating to the serving cell with respect to a first threshold and a measurement relating to each of the one or more target cells with respect to a second threshold;
before triggering mobility to one of the one or more target cells based on a satisfaction of the one or more conditional mobility conditions, detecting a radio link problem on a serving cell based on expiration of a timer which starts running upon receiving N-consecutive out-of-sync indications for the serving cell from lower layers;
performing a cell selection, wherein a target cell for which a cell selection criterion S is satisfied is selected among the one or more target cells by the cell selection, wherein the cell selection criterion S is that a measurement result of the target cell is above a default threshold, and wherein the cell selection criterion S is different from the one or more conditional mobility conditions; and
performing mobility to the selected target cell,
wherein the cell selection criterion S is satisfied based on:
Srxlev>0 AND Squal>0
where:
Srxlev=Qrxlevmeas−(Qrxlevmin+Qrxlevminoffset)−Pcompensation−Qoffsettemp
Squal=Qqualmeas−(Qqualmin+Qqualminoffset)−Qoffsettemp
where:
Srxlev denotes a cell selection reception (RX) level value, Qrxlevmeas denotes a measured cell RX level value, Qrxlevmin denotes a minimum required RX level value in a cell, Qrxlevminoffset denotes an offset to the Qrxlevmin, Pcompensation denotes a parameter related to additionalPmax, Qoffsettemp denotes an offset temporarily applied to the cell, Squal denotes a cell selection quality value, Qqualmeas denotes a measured cell quality value, Qqualmin denotes a minimum required quality level value in the cell, and Qqualminoffset denotes an offset to the Qqualmin.

### Claim 2 (depends on 1)

The method of claim 1, wherein the serving cell is a primary cell (PCell).

### Claim 3 (depends on 1)

The method of claim 1, wherein the mobility to the selected target cell is performed based on the measurement result of the target cell being above the default threshold, regardless of a quality of the serving cell.

### Claim 4 (depends on 1)

The method of claim 1, wherein the conditional mobility includes at least one of a conditional serving cell change, a conditional serving cell addition and a conditional serving cell release.

### Claim 5 (depends on 1)

The method of claim 1, wherein the conditional mobility configuration includes a list of the one or more target cells including the selected target cell.

### Claim 6 (depends on 5)

The method of claim 5, wherein the list of the one or more target cells includes an identifier (ID) of the one or more target cells.

### Claim 7 (depends on 1)

The method of claim 1, wherein the conditional mobility condition includes an ID of the serving cell and/or type of the conditional mobility.

### Claim 8 (depends on 1)

The method of claim 1, wherein the radio link problem is further detected upon receiving a random access problem indication from a media access control (MAC) entity of a master cell group (MCG), or receiving an indication from a radio link control (RLC) entity of the MCG that a maximum number of retransmissions has been reached.

### Claim 9 (depends on 1)

The method of claim 1, wherein the wireless device is in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the wireless device.

### Claim 10 (depends on 1)

The method of claim 1, wherein the one or more conditional mobility conditions are ignored.

### Claim 11 (depends on 1)

The method of claim 1, wherein the conditional mobility configuration includes target cell configurations for the one or more target cells.

### Claim 12 (depends on 11)

The method of claim 11, wherein the mobility to the selected target cell is performed based on a target cell configuration for the target cell among the target cell configurations for the one or more target cells received via the conditional mobility configuration.

### Claim 13

A wireless device operating in a wireless communication system, the wireless device comprising:
at least one transceiver;
at least processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, performs operations comprising:
receiving, from a network, a conditional mobility configuration including one or more conditional mobility conditions for one or more target cells, wherein the one or more conditional mobility conditions are configured based on one of 1) a comparison between a measurement relating to each of the one or more target cells and a measurement relating to a serving cell, or 2) comparison between a measurement relating to the serving cell with respect to a first threshold and a measurement relating to each of the one or more target cells with respect to a second threshold;
before triggering mobility to one of the one or more target cells based on a satisfaction of the one or more conditional mobility conditions, detecting a radio link problem on a serving cell based on expiration of a timer which starts running upon receiving N-consecutive out-of-sync indications for the serving cell from lower layers;
performing a cell selection, wherein a target cell for which a cell selection criterion S is satisfied is selected among the one or more target cells by the cell selection, wherein the cell selection criterion S is that a measurement result of the target cell is above a default threshold, and wherein the cell selection criterion S is different from the one or more conditional mobility conditions; and
performing mobility to the selected target cell,
wherein the cell selection criterion S is satisfied based on:
Srxlev>0 AND Squal>0
where:
Srxlev=Qrxlevmeas−(Qrxlevmin+Qrxlevminoffset)−Pcompensation−Qoffsettemp
Squal=Qqualmeas−(Qqualmin+Qqualminoffset)−Qoffsettemp
where:
Srxlev denotes a cell selection reception (RX) level value, Qrxlevmeas denotes a measured cell RX level value, Qrxlevmin denotes a minimum required RX level value in a cell, Qrxlevminoffset denotes an offset to the Qrxlevmin, Pcompensation denotes a parameter related to additionalPmax, Qoffsettemp denotes an offset temporarily applied to the cell, Squal denotes a cell selection quality value, Qqualmeas denotes a measured cell quality value, Qqualmin denotes a minimum required quality level value in the cell, and Qqualminoffset denotes an offset to the Qqualmin.

### Claim 14 (depends on 13)

The wireless device of claim 13, wherein the one or more conditional mobility conditions are ignored.

### Claim 15 (depends on 13)

The wireless device of claim 13, wherein the conditional mobility configuration includes target cell configurations for the one or more target cells.

### Claim 16 (depends on 15)

The wireless device of claim 15, wherein the mobility to the selected target cell is performed based on a target cell configuration for the target cell among the target cell configurations for the one or more target cells received via the conditional mobility configuration.

### Claim 17 (depends on 13)

The wireless device of claim 13, wherein the mobility to the selected target cell is performed upon the measurement result of the target cell being above the default threshold, regardless of a quality of the serving cell.

### Claim 18 (depends on 13)

The wireless device of claim 13, wherein the radio link problem is further detected base on receiving a random access problem indication from a media access control (MAC) entity of a master cell group (MCG), or receiving an indication from a radio link control (RLC) entity of the MCG that a maximum number of retransmissions has been reached.

### Claim 19

A processing apparatus of a wireless device configured to operate in a wireless communication system, the processing apparatus comprising:
at least processor; and
at least one memory operably connectable to the at least one processor, wherein the at least one processor is configured to perform operations comprising:
obtaining a conditional mobility configuration including one or more conditional mobility conditions for one or more target cells, wherein the one or more conditional mobility conditions are configured based on one of 1) a comparison between a measurement relating to each of the one or more target cells and a measurement relating to a serving cell, or 2) comparison between a measurement relating to the serving cell with respect to a first threshold and a measurement relating to each of the one or more target cells with respect to a second threshold;
before triggering mobility to one of the one or more target cells based on a satisfaction of the one or more conditional mobility conditions, detecting a radio link problem on a serving cell based on expiration of a timer which starts running upon receiving N-consecutive out-of-sync indications for the serving cell from lower layers;
performing a cell selection, wherein a target cell for which a cell selection criterion S is satisfied is selected among the one or more target cells by the cell selection, wherein the cell selection criterion S is that a measurement result of the target cell is above a default threshold, and wherein the cell selection criterion S is different from the one or more conditional mobility conditions; and
performing mobility to the selected target cell,
wherein the cell selection criterion S is satisfied based on:
Srxlev>0 AND Squal>0
where:
Srxlev=Qrxlevmeas−(Qrxlevmin+Qrxlevminoffset)−Pcompensation−Qoffsettemp
Squal=Qqualmeas−(Qqualmin+Qqualminoffset)−Qoffsettemp
where:
Srxlev denotes a cell selection reception (RX) level value, Qrxlevmeas denotes a measured cell RX level value, Qrxlevmin denotes a minimum required RX level value in a cell, Qrxlevminoffset denotes an offset to the Qrxlevmin, Pcompensation denotes a parameter related to additionalPmax, Qoffsettemp denotes an offset temporarily applied to the cell, Squal denotes a cell selection quality value, Qqualmeas denotes a measured cell quality value, Qqualmin denotes a minimum required quality level value in the cell, and Qqualminoffset denotes an offset to the Qqualmin.