A method of performing a conditional handover (CHO) procedure is described in some of the present embodiments. The method is performed by a user equipment (UE) and includes the following operations: receiving a plurality of CHO commands from a source base station, each CHO command having at least one triggering condition and corresponding to a target cell;

determining whether one or more triggered cells exist by determining whether the at least one triggering condition for each CHO command in the plurality of CHO commands that corresponds to each of the one or more triggered cells is fulfilled; and after determining that the one or more triggered cells exist: selecting one of the one or more triggered cells, and performing a handover procedure to connect to the selected one of the one or more triggered cells.

A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives a first Radio Resource Control (RRC) message indicative of switching a Primary Cell (PCell) of the UE to a first cell, wherein the first RRC message is indicative of a first configuration of the first cell. The UE resets a Medium Access Control (MAC) entity associated with the PCell of the UE in response to receiving the first RRC message. The UE receives a second RRC message indicative of a second configuration of a second cell. The UE receives a signaling indicative of initiating a mobility procedure to switch the PCell of the UE to the second cell. The signaling includes a Physical Downlink Control Channel (PDCCH) signaling and/or a MAC Control Element (CE). The UE does not reset the MAC entity associated with the PCell of the UE in response to the mobility procedure.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify that the UE is configured to use a two-step random access channel (RACH) procedure. The two-step RACH procedure may include an uplink request message and a downlink response. The UE may transmit the uplink request message as part of the two-step RACH procedure, and the uplink request message may include a preamble portion that is one of a set of predefined sequences and a payload portion that includes a physical uplink shared channel waveform. The UE may receive the downlink response as part of the two-step RACH procedure and in response to the uplink request message.

A method for user detachment when a handover or change occurs in a heterogeneous network is provided. The method includes: a user equipment (UE) is handed over or switched from a source network to a target network; a network element on a network side determines whether to detach the UE from the source network, and if yes, the network element on the network side detaches the UE from the source network. A system and a device for user detachment when a handover or change occurs in a heterogeneous network, and another method for user detachment when a handover or change occurs in a heterogeneous network are also provided.

A handover method, including sending, by a source base station to a source core network device in a process of handing user equipment (UE) over from the source base station to a target base station, a handover required message. The message comprises identification information of a target core network device, and the identification information of the target core network device instructs the source core network device to perform a core network relocation process with the target core network device. The source base station is connected to the source core network device, and the target base station is connected to both the source core network device and the target core network device.

Provided is a communication device that favorably implements SR communication and MU communication. A communication device that operates as a base station includes a determination unit that determines a communication status in a BSS of the communication device, and a control unit that controls transmission and reception of a signal regarding connection change of a terminal according to the communication status to and from a surrounding base station. The determination unit determines the presence of a small number of terminals falling outside a distribution of implementation statuses of spatial reuse communication or multi user communication of entire subordinate terminals, and transmits a signal requesting the small number of terminals to be connected to the surrounding base station or transmits a signal inquiring of the surrounding base station acceptance of the small number of terminals.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may initiate handover from one base station to another. The handover procedure may not include random access channel (RACH) transmissions, and thus may be a localized RACH-less handover. The UE may initiate handover to a new base station based on the relative location of the UE and the new base station, some predetermined time, or based on the characteristics of the signals from each base station.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration for a cell from a base station. In some examples, the cell may be deactivated and the base station may configure the cell with one or more base station beams. The UE may receive beam management resources for performing beam management based on the configured base station beams. In some examples, the beam management resources include resources for transmitting or receiving one or more reports indicating a quality of the configured base station beams. The UE may then perform the beam management, while the cell is deactivated, to track one or more UE beams corresponding to the configured base station beams.

A random access method includes: initiating, by user equipment (UE), a random access based on at least one of: initial access, uplink synchronization loss, or reconstruction; selecting, by the UE, a beam to transmit a preamble; determining, by the UE, whether a currently selected beam for transmitting the preamble is identical to multiple recorded beams previously selected for transmitting the preamble; determining, by the UE, that the currently selected beam is identical to one of the multiple recorded beams; determining, by the UE, a value of a pilot power boost counter not to reach a maximum value; and transmitting, by the UE, the preamble at a boosted pilot transmit power.

Embodiments of the present disclosure relate to a policy control method and system, a network element, and a storage medium. A control plane network element establishes, for UE, a first DN connection that uses a first forwarding plane network element as an anchor. The method includes: when the control plane network element receives a handover notification message for the UE and determines that a second forwarding plane network element serves the UE, or when the control plane network element establishes, for the UE, a second DN connection that uses a second forwarding plane network element as an anchor, the control plane network element updates a forwarding path of the first DN connection, so that an updated forwarding path of the first DN connection passes through the second forwarding plane network element, and the second forwarding plane network element performs policy control on a packet on the first DN connection.