Electronic device performing handover and operation method thereof
According to various embodiments, an electronic device comprises: memory storing instructions and at least one processor. The instructions, when executed by at least one processor, may cause the electronic device to: receive at least one radio resource control (RRC) reconfiguration message from a serving cell; perform measurement for at least one neighboring cell based on information associated with conditional reconfiguration confirmed on the basis of the at least one RRC reconfiguration message; and perform at least one procedure for handover to a target cell satisfying a specified condition, based on which a radio link failure with the serving cell is detected and at least a part of the measurement result for the at least one neighboring cell satisfies the specified condition confirmed based on the information associated with the conditional reconfiguration.
1 . An electronic device comprising:
memory storing instructions; and
at least one processor comprising processing circuitry,
wherein the instructions, that when executed by the at least one processor individually or collectively, cause the electronic device to:
receive, from a serving cell, at least one radio resource control (RRC) reconfiguration message including conditional reconfiguration information,
based on the conditional reconfiguration information, perform measurement for at least one neighboring cell,
when a result of the measurement for the at least one neighboring cell satisfies an execution condition identified by the conditional reconfiguration information, initiate a time to trigger (TTT) identified by the conditional reconfiguration information, wherein the TTT defines a time period during which the execution condition is to be satisfied in order to perform a procedure for a handover operation to a target cell,
in case that a radio link failure associated with the serving cell is detected before the TTT expires, perform the at least one procedure for the handover operation to the target cell regardless of an expiration of the TTT,
wherein the target cell is identified based on the result of the measurements and the target cell satisfying the execution condition.
2 . The electronic device of claim 1 , wherein the instructions, that when executed by at least one processor, cause the electronic device to:
identify that at least some of the measurement results for the target cell satisfy an entering execution condition identified based on the information associated with the conditional reconfiguration,
identify that the target cell has satisfied the designated condition, based on identifying that at least one measurement result for the target cell before the time point of detection of the radio link failure after satisfaction of the entering execution condition fails to satisfy a leaving execution condition identified based on the information associated with the conditional reconfiguration, and
wherein a period before the time point of detection of the radio link failure after satisfaction of the entering execution condition is shorter than the time to trigger.
3 . The electronic device of claim 1 , wherein the instructions, that when executed by at least one processor, cause the electronic device to:
based on identifying at least one measurement result for the target cell before the time point of detection of the radio link failure after satisfaction of the entering execution condition satisfying the execution condition during a period corresponding to a value obtained by adjusting thea time to trigger, identify that the target cell has satisfied the designated condition.
4 . The electronic device of claim 3 , wherein the instructions, that when executed by at least one processor, cause the electronic device to:
based on identifying at least one measurement result for the target cell before the time point of detection of the radio link failure after satisfaction of the execution condition during a period corresponding to a value obtained by adjusting the time to trigger,
identify that the target cell has satisfied the designated condition, based on identifying that a period, in which at least a part of at least one measurement result for the target cell before the time point of detection of the radio link failure after satisfaction of the entering execution condition fails to satisfy a leaving execution condition identified based on the information associated with the conditional reconfiguration, is equal to or longer than the value obtained by adjusting the time to trigger, and
wherein the obtained value is less than the time to trigger.
5 . The electronic device of claim 1 , wherein the instructions, that when executed by at least one processor, cause the electronic device to:
identify an entering condition based on the information associated with the conditional reconfiguration;
identify a relaxed execution condition satisfied at a reception strength less than a minimum reception strength for satisfying the execution condition;
identify that at least some of the measurement results for the target cell satisfy the relaxed execution condition; and
based on identifying at least one measurement result for the target cell before the time point of detection of the radio link failure after satisfaction of the relaxed execution condition during the time to trigger, identify that the target cell has satisfied the designated condition.
6 . The electronic device of claim 5 , wherein the instructions, that when executed by at least one processor, cause the electronic device to:
identify that at least some of the measurement results for the target cell satisfy a relaxed entering execution condition, wherein a minimum reception strength for satisfying the relaxed entering execution condition is less than a minimum reception strength for satisfying the entering execution condition, and
based on identifying at least one measurement result for the target cell before the time point of detection of radio link failure after satisfaction of the relaxed execution condition during the time to trigger,
identify that the target cell has satisfied the designated condition, based on a period, in which at least part of the at least one measurement result for the target cell before the time point of detection of the radio link failure after satisfaction of the relaxed entering execution condition fails to satisfy a relaxed leaving execution condition, being equal to or longer than the time to trigger, wherein a minimum reception strength failing to satisfy the relaxed entering execution condition is less than a minimum reception strength for satisfying the leaving execution condition.
7 . The electronic device of claim 1 , wherein the instructions, that when executed by at least one processor, cause the electronic device to:
identify an entering condition based on the information associated with the conditional reconfiguration;
identify a relaxed execution condition satisfied at a reception strength less than a minimum reception strength for satisfying the execution condition;
identify that at least some of the measurement results for the target cell satisfy the relaxed execution condition; and
based on identifying at least one measurement result for the target cell before the time point of detection of the radio link failure after satisfaction of the relaxed execution condition during a period corresponding to a value obtained by adjusting the time to trigger, identify that the target cell has satisfied the designated condition.
8 . The electronic device of claim 7 , wherein the instructions, that when executed by at least one processor, cause the electronic device to:
identify that at least some of the measurement results for the target cell satisfy a relaxed entering execution condition, wherein a minimum reception strength for satisfying the relaxed entering execution condition is less than a minimum reception strength for satisfying the entering execution condition, and
based on identifying that at least one measurement result for the target cell before the time point of detection of the radio link failure after the satisfaction of the relaxed execution condition is satisfied during a period corresponding to a value obtained by adjusting the time to trigger,
identify that the target cell has satisfied the designated condition, based on a period, in which at least part of the at least one measurement result for the target cell before the time point of detection of the radio link failure after the satisfaction of the relaxed entering execution condition fails to satisfy a relaxed leaving execution condition, being equal to or longer than a value obtained by adjusting the time to trigger, wherein a minimum reception strength for failing to satisfy the relaxed leaving execution condition is less than a minimum reception strength for satisfying the leaving execution condition, and the obtained value is less than the time to trigger.
9 . The electronic device of claim 1 , wherein the instructions, that when executed by at least one processor, cause the electronic device to:
identify an entering condition and a strict entering condition corresponding to the entering condition based on the information associated with the conditional reconfiguration, wherein a minimum reception strength for satisfying the strict entering condition is greater than a minimum reception strength for satisfying the execution condition; and
identify that the target cell has satisfied the designated condition, based on identifying that at least some of the measurement results for the target cell satisfy the strict execution condition.
10 . The electronic device of claim 1 , wherein the instructions, that when executed by at least one processor, cause the electronic device to:
based on one or more measurement results satisfying an execution condition and measured during a designated period before the detection of the radio link failure, identify that the execution condition is satisfied.
11 . The electronic device of claim 1 , wherein the instructions, that when executed by at least one processor, cause the electronic device to:
based on a plurality of or a designated number or more of the measurement results satisfying an execution condition measured during a designated period before the detection of the radio link failure, identify that the execution condition is satisfied.
12 . The electronic device of claim 1 , wherein the instructions, that when executed by at least one processor, cause the electronic device to:
identify a plurality of candidate cells satisfying the designated condition; and
select the target cell from among the plurality of candidate cells.
13 . The electronic device of claim 12 , wherein the instructions, that when executed by at least one processor cause the electronic device to, as at least part of the selecting the target cell from among the plurality of candidate cells:
perform a random access channel (RACH) procedure for the first candidate cell having the highest reception strength from among the plurality of candidate cells; and
based on the failure of the RACH procedure, select a second candidate cell having a reception strength, next highest to that of the first candidate cell, from among the plurality of candidate cells.
14 . The electronic device of claim 1 , wherein the instructions, that when executed by at least one processor cause the electronic device to, as at least part of the performing at least one procedure for handover to a target cell satisfying the designated condition:
identify at least one first candidate cell satisfying a first designated condition, and at least one second candidate cell satisfying a second designated condition different from the first designated condition; and
select a candidate cell among the at least one first candidate cell and the at least one second candidate cell as the target cell, based on a priority of each of the first designated condition and the second designated condition.
15 . A method of operating an electronic device comprising:
receiving, from a serving cell, at least one radio resource control (RRC) reconfiguration message including conditional reconfiguration information,
based on the conditional reconfiguration information, performing measurement for at least one neighboring cell,
when a result of the measurements for the at least one neighboring cell satisfies an execution condition identified by the conditional reconfiguration information, initiating a time to trigger (TTT) identified by the conditional reconfiguration information, wherein the TTT defines a time period during which the execution condition is to be satisfied in order to perform a procedure for a handover operation to a target cell,
in case that a radio link failure associated with the serving cell is detected before the TTT expires, performing the at least one procedure for the handover operation to thea target cell regardless of an expiration of the TTT,
wherein the target cell is identified based on the result of the measurements and the target cell satisfying the execution condition.
16 . The method of claim 15 , further comprising:
identifying that at least some of the measurement results for the target cell satisfy an entering execution condition identified based on the information associated with the conditional reconfiguration,
identifying that the target cell has satisfied the designated condition, based on identifying that at least one measurement result for the target cell before the time point of detection of the radio link failure after satisfaction of the entering execution condition fails to satisfy a leaving execution condition identified based on the information associated with the conditional reconfiguration, and
wherein a period before the time point of detection of the radio link failure after satisfaction of the entering execution condition is shorter than the time to trigger.
17 . The method of claim 15 , further comprising:
based on identifying at least one measurement result for the target cell before the time point of detection of the radio link failure after satisfaction of the entering execution condition satisfying the execution condition during a period corresponding to a value obtained by adjusting thea time to trigger, identifying that the target cell has satisfied the designated condition.
18 . A non-transitory computer-readable storage medium storing instructions, wherein the instructions, when executed by at least one processor of an electronic device, cause the electronic device to perform operations comprising:
receiving, from a serving cell, at least one radio resource control (RRC) reconfiguration message including conditional reconfiguration information;
based on the conditional reconfiguration information, performing measurement for at least one neighboring cell,
when a result of the measurements for the at least one neighboring cell satisfies an execution condition identified by the conditional reconfiguration information, initiating a time to trigger (TTT) identified by the conditional reconfiguration information, wherein the TTT defines a time period during which the execution condition is to be satisfied in order to perform a procedure for a handover operation to a target cell,
in case that a radio link failure associated with the serving cell is detected before the TTT expires, performing the at least one procedure for the handover operation to thea target cell regardless of an expiration of the TTT,
wherein the target cell is identified based on the result of the measurements and the target cell satisfying the execution condition.