Mechanism to update the CSG cell access check upon PLMN change at handover

摘要

Various combinations of these teachings solve dual errors for a user equipment UE checking whether a private cell is allowed when handing over between serving and target cells, where the PLMN and/or list of EPLMNs of the serving and target cells may differ. The serving cell may send a one-bit indication that there is a change in a handover command or a system information SI6 message after which the UE may or may not refrain from reporting new cells until it performs a registration/location area update in the target cell. The target cell may trigger in the UE a registration update then provide the UE with the PLMN of the target cell. The serving cell can provide the PLMN of the target cell in a SI6 message or handover command, which the UE may use in place of or in addition to the PLMN/EPLMN of the serving cell when checking whether a private/closed subscriber group cell is allowed.

主权项

1. An apparatus, comprising:
at least one processor; and at least one memory storing a computer program; wherein the at least one memory with the computer program is configured with the at least one processor to cause the apparatus to at least:
detect that for a user equipment there is a change to at least one of a public land mobile network (PLMN) and a list of equivalent PLMNs (EPLMNs) between a serving cell and a target cell, and thereaftersend to the user equipment an indication of the detected change during a handover of the user equipment in dedicated or connected mode from the serving cell to the target cell, andtrigger a location or registration area update procedure in the user equipment, in response to the sent indication of the detected change,wherein during the location or registration update procedure, the user equipment utilizes a received PLMN of the target cell in place of the PLMN of the serving cell and in place of a list of equivalent PLMNs of the serving cell to check whether a private cell is allowed for the user equipment,wherein the user equipment refrains from reporting private cells after the handover until the location or registration area update is complete, andwherein the indication of the detected change is included in handover signaling during the handover such that the user equipment is notified of the detected change at handover.