First transmission power can be determined (1110) for a first PRACH preamble in a 2-step random access procedure based on a first set of power control parameters. The first PRACH preamble can be transmitted (1120) in the 2-step random access procedure based on the first transmission power. A determination can be made (1130) to switch from the 2-step random access procedure to a 4-step random access procedure. Second transmission power can be determined (1140) based on the first set of power control parameters and a second set of power control parameters for a subsequent second PRACH preamble transmission for the 4-step random access procedure. The subsequent second PRACH preamble can be transmitted (1150) in the 4-step random access procedure based on the second transmission power.

In order to prevent deterioration of QoE of a user in intersystem handover, an apparatus according to the present invention includes: an information obtaining unit configured to obtain network slice related information related to a network slice used by a terminal apparatus in a first radio communication system; and a first communication processing unit configured to transmit, to a second network node of a second radio communication system, a message for intersystem handover of the terminal apparatus from the first radio communication system to the second radio communication system, the message including the network slice related information.

Disclosed is a method performed by a first base station (10) of a wireless communications network. The first base station (10) provides radio coverage to a first cell (20). The wireless communications network further comprises a second base station providing radio coverage to a second cell (40). A wireless device (50, 60), is located within the first cell (20) and is connected to the first base station (10). The method comprises receiving (202) a message from the WD (50, 60) indicating the second cell, obtaining (204) an indication of an altitude of the access point of the second base station (30), obtaining (206) an indication of an altitude of the WD (50, 60), and obtaining (208) an indication of an altitude of the access point of the first base station (10). The method further comprises handling (210) a connection of the WD (50, 60) to the first base station (10) based on the altitude indications.

Embodiments of the present disclosure provide a method. According to the method, a mark is added to a data packet. After user equipment is handed over from an original device to a target device, and before a user plane network element receives a handover notification, the user plane network element sends, through a path used before handover, a data packet that carries a first mark to the original device. The original device modifies the first mark in the data packet to a second mark, and then forwards, to the target device, a data packet whose mark is modified and that carries the second mark. After receiving the handover notification, the user plane network element sends, to the target device, a data packet that carries a fourth mark. The target device can distinguish between sources of the received data packets based on different marks in the received data packets.

A random access method and device. The method includes receiving, by user equipment, a radio resource control (RRC) connection reconfiguration message from a first network device, the RRC connection reconfiguration message indicating a primary serving cell of the second network device for a user equipment, an active uplink bandwidth part (BWP) in the primary serving cell, and an active downlink BWP in the primary serving cell, the RRC connection reconfiguration message includes an uplink BWP identifier indicating the active uplink BWP and a downlink BWP identifier indicating the active downlink BWP, the uplink BWP identifier corresponds to the active uplink BWP, the downlink BWP identifier corresponds to the active downlink BWP, and initiating, by the user equipment, a random access procedure to the second network device on the active uplink BWP and the active downlink BWP.

There is provided an apparatus, said apparatus comprising means for receiving a handover command from a first cell, the handover command comprising an uplink resource grant and a condition to be met before handover is performed to a second cell, wherein the uplink resource grant indicates a set of uplink resources for uplink data transmission in the second cell without random access, determining validity of the uplink resource grant based on one or more further configuration parameter and in response to the condition being met, performing the handover according to the validity of the uplink resource grant.

The present invention relates to a method of transmitting a signal by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of receiving a handover command containing configurations for a second network, from a first network; performing a random access procedure to the second network; re-establishing a packet data convergence protocol (PDCP) entity associated with a signaling radio bearer (SRB) based on the configurations for the second network, after a random access procedure to the second network successes; transmitting a radio resource control (RRC) message to the second network using the re-established PDCP entity.

An embodiment of the present disclosure relates to a handover method between network devices and a network device. The method includes: sending, by a network device, at least one handover command corresponding to a plurality of target network devices to a terminal device. The at least one handover command corresponding to the plurality of target network devices includes a first handover command, and the first handover command includes configuration information of a first target network device among the plurality of target network devices, so that the terminal device starts a first access timer corresponding to the first target network device in response to that the terminal device determines to establish a connection with the first target network device. The terminal device establishes a connection with the first target network device according to the first access timer.

Techniques for beam-based relay node switch. An example method of wireless communication by a first wireless node generally includes relaying wireless communications between a user equipment (UE)(120, 120a-y) and a network entity; transmitting, to one or more second wireless nodes, relay request signals via a plurality of beams(402a-d, 602a-d, 604a-b, 706a-b) at relay request signal occasions(1, 2, 3), wherein each of the relay request signals indicates a request to switch relay services of the UE(120, 120ay) from the first wireless node to the one or more second wireless nodes; and switching the relay services of the UE(120, 120a-y) to at least one of the one or more second wireless nodes.

A handover handling method and apparatus applied to a scenario in which user equipment (UE) is handed over from a first access and management function (AMF) to a second AMF, and where the method includes receiving, by the UE, a handover command message from a first access network device, wherein the handover command message carries a Non-Access Stratum container (NASC), performing, by the UE, integrity verification on the NASC, and continuing, by the UE, to use a first NAS security context when the integrity verification performed on the NASC fails, wherein the first NAS security context is a security context used between the UE and the first AMF.