Handling conditional handover

A first apparatus comprising:

• at least one processor;
• and
• at least one memory storing instructions that, when executed by the at least one processor, cause the first apparatus at least to:
• receive, from a second apparatus, configuration information indicating:
• a first conditional cell change configuration associated with a first candidate cell of the first apparatus, and
• a second conditional cell change configuration associated with a second candidate cell of the first apparatus;
• and
• in accordance with a determination that a first condition for switching to the first candidate cell is met, continue to evaluate a second condition for switching to the second candidate cell within a period, wherein a time length of the period is associated with the following:
• a first time length required for decoding a handover configuration used for switching to the first candidate cell, and a second time length corresponding to an execution preparation time length for switching to the first candidate cell;
• continue to evaluate the second condition for switching to the second candidate cell within the period before an interruption caused by performing a Physical Random Access Channel (PRACH) transmission;
• determine a communication quality of the second candidate cell;
• in response to a difference between the communication quality and a communication quality required by the second condition being below a threshold quality, continue to evaluate the second condition;
• and
• in accordance with a determination that the second condition for switching to the second candidate cell is met within the period, trigger a switch to the first and second candidate cells, wherein the first apparatus is served by a first serving cell and a second serving cell.

A system comprising:

• a first apparatus:
• at least one processor;
• and
• at least one memory storing instructions that, when executed by the at least one processor, cause the first apparatus at least to:
• receive, from a second apparatus, configuration information indicating:
• a first conditional cell change configuration associated with a first candidate cell of the first apparatus, and
• a second conditional cell change configuration associated with a second candidate cell of the first apparatus;
• and
• in accordance with a determination that a first condition for switching to the first candidate cell is met, continue to evaluate a second condition for switching to the second candidate cell within a period, wherein a time length of the period is associated with the following:
• a first time length required for decoding a handover configuration used for switching to the first candidate cell, and a second time length corresponding to an execution preparation time length for switching to the first candidate cell;
• continue to evaluate the second condition for switching to the second candidate cell within the period before an interruption caused by performing a Physical Random Access Channel (PRACH) transmission;
• determine a communication quality of the second candidate cell;
• in response to a difference between the communication quality and a communication quality required by the second condition being below a threshold quality, continue to evaluate the second condition;
• and
• in accordance with a determination that the second condition for switching to the second candidate cell is met within the period, trigger a switch to the first and second candidate cells, wherein the first apparatus is served by a first serving cell and a second serving cell.

A method comprising:

• receiving, by a first apparatus from a second apparatus, configuration information indicating:
• a first conditional cell change configuration associated with a first candidate cell of the first apparatus, and
• a second conditional cell change configuration associated with a second candidate cell of the first apparatus;
• and
• in accordance with a determination that a first condition for switching to the first candidate cell is met, continuing to evaluate a second condition for switching to the second candidate cell within a period, wherein a time length of the period is associated with the following:
• a first time length required for decoding a handover configuration used for switching to the first candidate cell, and a second time length corresponding to an execution preparation time length for switching to the first candidate cell;
• continuing to evaluate the second condition for switching to the second candidate cell within the period before an interruption caused by performing a Physical Random Access Channel (PRACH) transmission;
• determining a communication quality of the second candidate cell;
• in response to a difference between the communication quality and a communication quality required by the second condition being below a threshold quality, continuing to evaluate the second condition;
• and
• in accordance with a determination that the second condition for switching to the second candidate cell is met within the period, triggering a switch to the first and second candidate cells, wherein the first apparatus is served by a first serving cell and a second serving cell.