US-12621735-B2 - Mobility optimization control

US12621735B2US 12621735 B2US12621735 B2US 12621735B2US-12621735-B2

Abstract

According to an example aspect of the present invention, there is provided a method, comprising: detecting a radio frequency, RF, exposure limitation event, detecting a mobility related event, and transmitting, to a network node, a report message for mobility optimization, the report message being indicative of the mobility related event and comprising RF exposure limitation information of the RF exposure limitation event.

Inventors

Irina-Mihaela BALAN
Sina KHATIBI
Ahmad Awada
Ingo Viering
Malgorzata Tomala

Assignees

NOKIA TECHNOLOGIES OY

Dates

Publication Date: 20260505
Application Date: 20220225
Priority Date: 20210330

Claims (1)

1 . A user equipment (UE) apparatus, comprising: at least one processor; and at least one memory, said at least one memory stored with computer program code thereon, the at least one memory and the computer program code configured to, with the at least one processor, cause the UE apparatus at least to: detect a radio frequency (RF) exposure limitation event; generate an RF exposure limitation event record in response to the detected RF exposure limitation event; detect a mobility related event, wherein the mobility related event is a beam failure event for the apparatus, the beam failure event comprising failure of a beamformed radio transmission for the UE apparatus; trigger a timer in response to detecting the RF exposure limitation event and include the RF exposure limitation information to a report message for mobility optimization before expiry of the timer; check RF exposure limitation status in response to the detecting the mobility related event; include an RF exposure limitation status indicator in the report message on the basis of the checking, wherein the RF exposure limitation status indicator indicates if the RF exposure limitation was active when detecting the mobility related event; include, after detecting the mobility related event, the RF exposure limitation information in the report message based on information in the RF exposure limitation event record; include the RF exposure limitation information in the report message in response to: each radio access channel attempt during random access to a target cell of handover, detecting the mobility related event for a source cell while performing random access to a target cell in dual active protocol stack handover, and detecting the mobility related event for a source cell and a target cell during dual active protocol stack handover execution, or detecting a beam failure; and transmit, to a network node, the report message, the report message being indicative of the mobility related event and comprising RF exposure limitation information of the RF exposure limitation event, wherein the report message is configured to cause the network node to change one or more controlling MPE parameters, wherein the RF exposure limitation event comprises detection that a maximum permissible exposure (MPE) for a wireless device has been exceeded, and wherein the RF exposure limitation information comprises a time duration of the RF exposure limitation event and a magnitude value of exposure above a threshold, actual transmit power, an RF exposure limitation status indicator that indicated whether the RF exposure limitation was active when detecting the mobility related event, and a flag indicating whether MPE was active or not.

Description

RELATED APPLICATION This application was originally filed as PCT Application No. PCT/EP2022/054781 on Feb. 25, 2022, which claims priority from Finnish Application No. 20215373, filed on Mar. 30, 2021, each of which is incorporated herein by reference in its entirety. FIELD Various example embodiments relate in general to wireless communication networks and more specifically, facilitating and controlling mobility optimization in such networks. BACKGROUND Upcoming mobile communication systems should fulfill a wide range of technical requirements to cope with the explosive growth of mobile data traffic, massive number of connected devices, emergence of new services and need for increased data transmission speed for mobile users. Self-organizing networks (SONs) have been developed for mobile network management to reduce operational expenses, improve network coverage, capacity and service quality, detect and heal network faults. Mobile network self-optimization aims for optimized parameters and coverage usage, increased network quality and performance, and ensuring service quality for all mobile network users. Mobility Robustness Optimization (MRO) is a mobility optimization technique aiming at reducing number of connection failures, comprising of Radio Link Failure (RLF) and handover failures (HOFs), in the network. MRO provides a solution for automatic detection and correction of errors in the mobility configuration. MRO adjusts the mobility parameters based on the statistics that are collected from the network and from UEs. SUMMARY Some aspects of the invention are defined by the features of the independent claims. Some specific embodiments are defined in the dependent claims. According to a first aspect, there is provided a method, comprising: detecting a radio frequency, RF, exposure limitation event, detecting a mobility related event, and transmitting, to a network node, a report message for mobility optimization, the report message being indicative of the mobility related event and comprising RF exposure limitation information of the RF exposure limitation event According to a second aspect, there is provided a method, comprising: receiving a report message for mobility optimization, wherein the report message is indicative of a mobility related event experienced by a mobile device and comprises RF exposure limitation information, and controlling mobility optimization in the wireless network on the basis of the RF exposure limitation information in the received report message. In an embodiment of the first aspect or an embodiment thereof, RF exposure limitation status is checked in response to the detecting the mobility related event. An RF exposure limitation status indicator may be included in the report message on the basis of the checking. The RF exposure limitation status indicator may indicate if the RF exposure limitation was active when detecting the mobility related event. In an embodiment of the first aspect or an embodiment thereof, an RF exposure limitation event record is generated in response to the detected RF exposure limitation event. The RF exposure limitation information may be included in the report message based on information in the RF exposure limitation event record. In an embodiment of the first aspect or an embodiment thereof, a timer is triggered in response to detecting the RF exposure limitation event and the RF exposure limitation information is included to the report message before expiry of the timer. In an embodiment of the first aspect or an embodiment thereof, the RF exposure limitation information is included in the report message in one or more of: for each radio access channel attempt during random access to a target cell of handover, upon detecting the mobility event for a source cell while performing random access to a target cell in dual active protocol stack handover, upon detecting the mobility event for a source cell and/or a target cell during dual active protocol stack handover execution, and in response to detecting a beam failure. In an embodiment of the second aspect or an embodiment thereof, the controlling mobility optimization comprises preventing mobility optimization based on the mobility related event in response to detecting an indication of an RF exposure limitation event for the mobile device in the report message. In an embodiment of the first or second aspect or an embodiment thereof, at least some information in the report message is transmitted for mobility optimization in response to the report message indicating that RF exposure limitation event was not detected or active upon the mobile device experiencing the mobility related event. In an embodiment of the first or second aspect or an embodiment thereof, at least some of the RF exposure limitation information is used or transmitted for controlling parameters affecting RF exposure limitation applied by the mobile device. In an embodiment of the first or second aspect or an embodiment there