Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a first control message indicating a set of mobility parameters associated with a lower layer handover procedure, which may be a layer 1 (L1)/layer 2 (L2) handover procedure. The UE may receive a second control message indicating a first or second reset procedure, which may each indicate a respective set of operating parameters for a higher layer than L1/L2 in the protocol stack. The UE may perform the lower layover handover procedure, which may include switching from a first serving cell to a second serving cell. The UE may perform the first or second reset procedure based on the switching, where the first reset procedure may include maintaining the operating parameters of the second serving cell, and the second reset procedure may include switching the operating parameters of the second serving cell.

A UE, in response to a beam failure being detected for a serving cell that serves the user equipment, determines whether a timer is running. One of the following is performed by the UE: in response to the timer running, a beam failure recovery procedure with a target non-serving cell; or in response to the timer not running, a beam failure recovery procedure with the serving cell. Methods, apparatus, computer programs, and computer program products are disclosed.

A method for processing information and a device for processing information are provided. The method for processing information is applied to a first node. The method includes: receiving, by the first node, an indication message from a network side, wherein the indication message indicates a user equipment under the first node to hand over to a second node; and negotiating, by the first node, with the second node to reserve radio link layer control protocol (RLC) status information and cached data of all bearers of the user equipment, so that the second node provides a continuing data service to the user equipment based on the reserved information.

A method for managing handover procedure in a radio access network (RAN) includes initiating, by a source base station, a handover procedure for a first user equipment with a target base station, wherein the first user equipment is connected to the source base station; identifying, by the source base station, a second user equipment that functions as a relay device, for relaying data related to the first user equipment from the source base station to the first user equipment during the handover procedure; establishing, by the source base station, a first connection between the identified second user equipment and the first user equipment; transmitting, by the source base station, buffered data corresponding to the first user equipment, to the target base station; transmitting, by the source base station, at least one block of data from the buffered data to the first user equipment, via the second user equipment, during the handover procedure for the first user equipment from the source base station to the target base station; and disconnecting, by the source base station, the established first connection between the second user equipment and the first user equipment, upon receiving a sequence number (SN) status request message from the target base station.

A method for a handover of a mobile station performed by a source base station and a target base station. The target base station receives a handover request message, from the source base station, in which includes QoS information of the mobile device, radio bearer identifier information of the source base station, and a first mapping relationship between a flow and a radio bearer of the source base station, the target base station acknowledges with a handover acknowledgement message. Therefore resource preparation at the target base station during a handover procedure is improved.

A radio network (6) and a radio terminal (4) are configured to, when the radio terminal (4) is using a first cell (10) served by a first radio station (1) as a primary cell and a second cell (20) served by a second radio station (2) as a secondary cell, change the primary cell from the first cell (10) to a third cell (30) served by a third radio station (3) while keeping communication status information regarding the radio terminal (1) on the second cell (20). It is thus, for example, possible to enable a communication service in the secondary cell to he continued even after the primary cell is changed when the primary cell is changed during execution of carrier aggregation (e.g., Inter-eNB CA) on a plurality of cells served by different radio stations.

Techniques for secure control plane communications between a User Equipment (UE) and a gNB are provided. A RAN network entity decides to handover a UE from a source base station (BS) to a target BS, wherein the RAN network entity controls a plurality of BSs including at least one of the source BS or the target BS, and wherein at least a portion of a control plane (CP) protocol layer is implemented at the target BS. The network entity generates at least one key specific to the target BS, based on a master key and a freshness parameter, the master key associated with the network entity. The network entity transmits an indication of the at least one key to the target BS, wherein the target BS exchanges control signaling with the UE based on the CP protocol layer using the at least one key.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive, from a base station and based at least in part on a triggering event, an indication of a frequency domain indexing configuration for a relative reference point. The user equipment may use at least one of a start of a control resource set or an absolute reference point for the relative reference point based at least in part on the indication of the frequency domain indexing configuration. Numerous other aspects are provided.

An apparatus of a base station (BS) of a radio access network (RAN) comprises memory and processing circuitry. The processing circuitry includes a central unit (CU) portion and a distributed unit (DU) portion that implement a BS multi-layer protocol stack divided between the CU portion and the DU portion. The processing circuitry initiates a handover to change a serving cell of user equipment (UE). The handover includes a change in a portion of logical layers of the BS multi-layer protocol stack, and the processing circuitry encodes an information element for transmission to the UE indicating logical layers of a UE multi-layer protocol stack implemented in the UE to be reset by the UE in association with the handover.

Embodiments of the present invention disclose a communication method, a source base station, a target base station, a core network device, and a terminal device, where the method includes: sending, by a source base station, a handover request to a target base station, where the handover request is used to request to hand over a session of a terminal device from the source base station to the target base station, and the handover request includes an identifier of a session requested to be handed over and indication information of a network slice corresponding to the session; and receiving, by the source base station, a handover response message from the target base station.