JP-2022532631-A5 -

Dates

Publication Date

20230522

Application Date

20200513

Description

The user equipment is further configured to check the conditions for application and, if applicable, trigger a conditional handover. In other words, the configuration data may relate, for example, to multiple target cells in a cellular network that will necessarily be located along the estimated future path of the UE. For each of these target cells, the configuration data may indicate one or more relevant conditions for application that should be continuously determined by the UE. If any (or all, or any combination thereof) of these conditions are met, this situation triggers the UE to initiate CHO to the respective target cell. Thus, the configuration data may consist of parts , each related to a specific target cell, and containing one or more conditions related to each target cell. In a preferred embodiment, the user device is configured to delete a first part of the configuration data and retain a second part of the configuration data after a conditional handover is complete. Alternatively, it is configured to delete the first part related to the completion of the conditional handover (or related to the corresponding target cell) in response to the completion of a handover to a particular target cell. This eliminates the need for the network to update the UE's configuration data after a CHO is performed, and the UE does not need to check conditions for target cells where a CHO has already been performed. Furthermore, the UE may not want to switch back to a target cell where a CHO has already been performed among multiple target cells due to a CHO. For example, when configuration data is changed, the first part of the configuration data related to completed and/or finished handovers may be deleted from the configuration data, while the second part of the configuration data related to incomplete or unfinished handovers may be preserved. In a preferred embodiment, user equipment is configured to receive configuration data consisting of a first portion and a second portion . The first portion of the configuration data consists of group-specific or common parameters, such as LEO satellite routes, to reduce signaling overhead, and is received by broadcast transmission, groupcast transmission, or multicast transmission, while the second portion of the configuration data consists of user-specific or individual parameters and is received by unicast transmission. The first potion of configuration data may be overwritten by the second potion of configuration data; in other words, common parameters may be overwritten by individual parameters. The cellular network either pre-prepares for the handover of the user devices of the present invention to each cell, or simply prepares for future handovers that the user devices may perform to each cell. Pre-preparation may include assigning one of the available IDs to the user devices. This ID may be included, for example, in a user device-specific portion of the configuration data. Embodiments of cellular networks supporting conditional handover would bring about several new ideas, without limiting them to, for example, vehicle networks and/or mobile gNBs, such as the following: - CHO configuration data is not deleted after CHO is executed. - CHO setting data for multiple consecutive cells. - Provision of CHO configuration data via broadcast/multicast signals. - The CHO setting must be active or inactive by default. - Request for sequential CHO setting directed to the target cell, for the target gNB or target cell. - Provide sequential CHO settings for target cells. If sequential CHO is not possible, notify the UE. - Notify the previous cell or previous serving cell, and future cells or potential target cells that the CHO is complete. - Provide UE CHO configuration data as part of UE context information, and, - If CHO is not executed as scheduled, UE will reconnect to the network. When UE110 reaches cell 5, UE110 is updated by cell 5 with CHO configuration update data 325, which consists of further trigger conditions and configuration data for handover from cell 5 to cell 6 and handover from cell 6 to cell 7. The configuration update data 325 may consist of a new version of the configuration data 1100, or it may consist only of change potions , or it may consist of delta potions . After a successful execution of CHO, a new cell or new serving cell and/or new target cell can, for example, add several criteria, extend paths or routes, modify or remove CHO settings from a sequential list or from CHO setting data. To conserve signaling, a delta or change portion signaling may be provided that signals only the modified setting entries, for example. After the conditional handover is complete, UE 110 modifies the sequential CHO setting data by deleting the already completed conditional handover from cell 1 to cell 2, for example, 210, and saving or maintaining the second part of the conditional data. In some cases, signaling overhead can be further reduced if multiple UEs are trav