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Conditional handovers for wireless relay networks

專利號
US11997551B2
公開日期
2024-05-28
申請人
SHARP KABUSHIKI KAISHA（JP Sakai）
發(fā)明人
Atsushi Ishii
IPC分類
H04W36/12; H04W36/00; H04W36/30
技術(shù)領(lǐng)域
node,iab,message,wireless,rlf,handover,radio,child,access,may
地域： Osaka

摘要

A wireless node that communicates over a radio interface with a wireless access node of a radio access network (RAN) through an Integrated Access and Backhaul (IAB) node, the wireless node comprising: receiver circuitry configured to: receive from the wireless access node a reconfiguration message comprising a conditional handover configuration, the conditional handover configuration comprising a triggering condition and a configuration of a candidate target cell, the triggering condition comprising at least one threshold value; receive from the IAB node a notification message comprising information representing a radio condition measured on a path between the IAB node and the wireless access node, and; processor circuitry configured to perform, based on the triggering condition and the information, a handover using the configuration of the candidate target cell.

說明書

As described above, following the RRC connection establishment procedure, the DU of IAB-node 1 and IAB-donor may proceed with F1 setup procedure using the F1-AP* protocol, which may activate one or more cells served by the DU of IAB-node 1—thereby allowing other IAB nodes and/or UEs to camp on the cell. In this procedure, the Adaptation Layer for IAB-node 1 and IAB—donor may be configured and activated as well.

FIG. 6B depicts an example message sequence or flow of information for IAB-node 2 to establish an RRC connection with IAB-donor, followed by the F1 setup procedure. It is assumed in this embodiment that IAB-node 1 has already performed the process disclosed in FIG. 6A to establish an RRC and F1-APS' connection. Referring back to FIG. 3, the IAB-node 2 shown in communication via the radio interface with IAB-node 1, may be also depicted in FIG. 6B as a child node of IAB-node 1 according to aspects of the present embodiments.

Due to the nature of wireless communications, the wireless backhaul links are susceptible to be deteriorated or broken at any time. In aspects of the present embodiments, the MT part of an IAB-node may constantly monitor the quality of the radio link and/or signal quality on the upstream of the IAB-node, where the radio link may be to a parent IAB node/donor of the IAB-node. If radio problems cannot be recovered in a designated duration, the MT may declare Radio Link Failure (RLF), meaning a loss of communication link may have occurred or signal strength is weak to continue (e.g., below a threshold).

權(quán)利要求

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