A method for performing inter-cell mobility management comprising: receiving, by a user equipment, UE , from a network via a source cell , a higher-layer signaling comprising configuration information for measuring radio resource management reference signals, RRM-RSs, from the network via neighbor cells ; receiving, by the UE from the network via the source cell, at least one of a Layer 1, L1, and a Layer 2, L2, signaling including additional configuration information for enabling the UE to measure a RRM-RS received from the network via an identified neighbor cell of the neighbor cells, to acquire system information for inter-cell mobility from the network via the identified neighbor cell or to update system information of the UE for inter-cell mobility, and to perform radio link monitoring, RLM, for the identified neighbor cell for inter-cell mobility; receiving, by the UE, the RRM-RS from the network via the identified neighbor cell; measuring , by the UE, the received RRM-RS based on the additional configuration information after the UE synchronizes with the network via the identified neighbor cell based on the received RRM-RS; and acquiring , by the UE, system information from the network via the identified neighbor cell; subsequent to the UE acquiring system information from the network via the identified neighbor cell, resetting, by the UE, a RLM timer and one or more counters based on the additional configuration information; receiving, by the UE, a RRM-RS from the network via the identified neighbor cell; and measuring , by the UE, the received RRM-RS for RLM based on the additional configuration information. receiving, by a user equipment, UE , from a network via a source cell , a higher-layer signaling comprising configuration information for measuring radio resource management reference signals, RRM-RSs, from the network via neighbor cells ; receiving, by the UE from the network via the source cell, at least one of a Layer 1, L1, and a Layer 2, L2, signaling including additional configuration information for enabling the UE to measure a RRM-RS received from the network via an identified neighbor cell of the neighbor cells, to acquire system information for inter-cell mobility from the network via the identified neighbor cell or to update system information of the UE for inter-cell mobility, and to perform radio link monitoring, RLM, for the identified neighbor cell for inter-cell mobility; receiving, by the UE, the RRM-RS from the network via the identified neighbor cell; measuring , by the UE, the received RRM-RS based on the additional configuration information after the UE synchronizes with the network via the identified neighbor cell based on the received RRM-RS; and acquiring , by the UE, system information from the network via the identified neighbor cell; subsequent to the UE acquiring system information from the network via the identified neighbor cell, resetting, by the UE, a RLM timer and one or more counters based on the additional configuration information; receiving, by the UE, a RRM-RS from the network via the identified neighbor cell; and measuring , by the UE, the received RRM-RS for RLM based on the additional configuration information. <EOS>