Conditional handovers for wireless relay networks
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
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This Nonprovisional application claims priority under 35 U.S.C. § 119 on provisional Application No. 62/842,368 on May 2, 2019, the entire contents of which are hereby incorporated by reference.
The technology relates to wireless communications, and particularly to radio architecture and operation for resolving problematic conditions on wireless backhaul links.
A radio access network typically resides between wireless devices, such as user equipment (UEs), mobile phones, mobile stations, or any other device having wireless termination, and a core network. Example of radio access network types includes the GRAN, GSM radio access network; the GERAN, which includes EDGE packet radio services; UTRAN, the UMTS radio access network; E-UTRAN, which includes Long-Term Evolution; and g-UTRAN, the New Radio (NR).
A radio access network may comprise one or more access nodes, such as base station nodes, which facilitate wireless communication or otherwise provides an interface between a wireless terminal and a telecommunications system. A non-limiting example of a base station can include, depending on radio access technology type, a Node B (“NB”), an enhanced Node B (“eNB”), a home eNB (“HeNB”), a gNB (for a New Radio [“NR”] technology system), or some other similar terminology.
權(quán)利要求
What is claimed is:1. 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 comprisingreceiver circuitry configured to: receive from the wireless access node a reconfiguration message comprising a conditional handover configuration, the conditional handover configuration comprising an identification of a candidate target cell and configuration parameters for the candidate target cell; 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 information, a handover to the candidate target cell, using the configuration parameters. 2. The wireless node of claim 1 , wherein the information corresponds to signal strength/quality, and the handover is performed by evaluating the signal strength/quality. 3. The wireless node of claim 1 , wherein the information corresponds to a radio link failure (RLF), and the handover is performed by considering the RLF as if the RLF were occurring at the wireless node. 4. The wireless node of claim 1 , wherein the conditional handover configuration further comprises a triggering condition defining a reception of the notification message as an event to trigger the handover to the candidate target cell. 5. A method for a wireless node that communicates over a radio interface with a wireless access node of a radio access network (RAN) through at least one Integrated Access and Backhaul (IAB) node, the method comprisingreceiving from the wireless access node a reconfiguration message comprising a conditional handover configuration, the conditional handover configuration comprising an identification of a candidate target cell and configuration parameters for the candidate target cell; receiving 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; performing, based on the information, a handover to the candidate target cell, using the configuration parameters. 6. A wireless access node of a radio access network (RAN) that communicates over a radio interface with a wireless node through an Integrated Access and Backhaul (IAB) node, the wireless access node comprising:processor circuitry configured to generate a reconfiguration message comprising a conditional handover configuration, the conditional handover configuration comprising an identification of a candidate target cell and configuration parameters for the candidate target cell; transmitter circuitry configured to transmit the reconfiguration message to the wireless node; wherein the identification of a candidate target cell and information are used by the wireless node to perform a handover to the candidate target cell, using the configuration parameters, the information representing a radio condition measured on a path between the IAB node and the wireless access node, and; the information is included in a notification message sent to the wireless node by the IAB node. 7. The wireless access node of claim 6 , wherein the information corresponds to signal strength/quality, and the handover is performed by evaluating the signal strength/quality. 8. The wireless access node of claim 6 , wherein the information corresponds to a radio link failure (RLF), and the handover is performed by considering the RLF as if the RLF were occurring at the wireless node. 9. The wireless access node of claim 6 , wherein the conditional handover configuration further comprises a triggering condition defining a reception of the notification message as an event to trigger the handover to the candidate target cell.
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