A Radio Access Network, RAN, node comprising: a transceiving unit; a storage unit configured to store processor-executable instructions; and a processing unit coupled to the storage unit and the transceiving unit, the processing unit is configured, when executing the processor-executable instructions, to: - monitor whether a Core Network, CN, initiates a normal session release for at least one user equipment, UE, at a time instant within a first time period, the normal session release causing at least one communication session between the at least one UE and the RAN node to be normally released rather than dropped; - if the CN initiates the normal session release for the at least one UE at the time instant within the first time period, determine whether a Radio Link Failure, RLF, timer has been previously triggered in the RAN node within a second time period, the RLF timer indicating a potential loss of the at least one communication session by the at least one UE, and the second time period at least partially overlapping with the first time period such that the time instant is within the second time period; - if the RLF timer has been previously triggered in the RAN node within the second time period, count a total number of the at least one communication session to be normally released based on the normal session release for the at least one UE; and - cause the transceiving unit to send a report comprising the total number of the at least one communication session to be normally released to a network management system when the first time period expires. a transceiving unit; a storage unit configured to store processor-executable instructions; and a processing unit coupled to the storage unit and the transceiving unit, the processing unit is configured, when executing the processor-executable instructions, to: - monitor whether a Core Network, CN, initiates a normal session release for at least one user equipment, UE, at a time instant within a first time period, the normal session release causing at least one communication session between the at least one UE and the RAN node to be normally released rather than dropped; - if the CN initiates the normal session release for the at least one UE at the time instant within the first time period, determine whether a Radio Link Failure, RLF, timer has been previously triggered in the RAN node within a second time period, the RLF timer indicating a potential loss of the at least one communication session by the at least one UE, and the second time period at least partially overlapping with the first time period such that the time instant is within the second time period; - if the RLF timer has been previously triggered in the RAN node within the second time period, count a total number of the at least one communication session to be normally released based on the normal session release for the at least one UE; and - cause the transceiving unit to send a report comprising the total number of the at least one communication session to be normally released to a network management system when the first time period expires. - monitor whether a Core Network, CN, initiates a normal session release for at least one user equipment, UE, at a time instant within a first time period, the normal session release causing at least one communication session between the at least one UE and the RAN node to be normally released rather than dropped; - if the CN initiates the normal session release for the at least one UE at the time instant within the first time period, determine whether a Radio Link Failure, RLF, timer has been previously triggered in the RAN node within a second time period, the RLF timer indicating a potential loss of the at least one communication session by the at least one UE, and the second time period at least partially overlapping with the first time period such that the time instant is within the second time period; - if the RLF timer has been previously triggered in the RAN node within the second time period, count a total number of the at least one communication session to be normally released based on the normal session release for the at least one UE; and - cause the transceiving unit to send a report comprising the total number of the at least one communication session to be normally released to a network management system when the first time period expires.