Base Station Handover Scheduling Using QoS Burst Arrival Time
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Solution Overview
Problem
In communication scenarios requiring ultra-reliable and low-latency services, such as industrial control, the challenge is for a target base station to efficiently obtain the service characteristics of a QoS flow during a handover, especially in switching an Xn interface between base stations.
Innovation Solution
A method and apparatus that enable a target base station to determine the burst arrival time of a QoS flow by utilizing a path switch request response message, eliminating the need for a subsequent PDU session modification procedure, thereby reducing signaling overheads and improving scheduling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the conventional PDU session modification procedure is used to obtain burst arrival time, then the target base station can acquire service characteristics, but signaling overheads increase and delay is generated
Solution Approach 1:
The source base station performs preliminary action by determining the burst arrival time of the downlink QoS flow and including it in the handover request message before handover occurs. This allows the target base station to obtain the service characteristic information in advance during the handover procedure, eliminating the need for subsequent PDU session modification procedures and reducing the delay in obtaining burst arrival time.
Solution Approach 2:
The patent merges the transmission of burst arrival time information with the existing handover request message. By combining the service characteristic information transfer with the handover procedure, the patent eliminates separate signaling procedures, thereby reducing signaling overheads while ensuring the target base station receives the necessary information.
2Loss of information
If the PDU session modification procedure is initiated by SMF to obtain burst arrival time, then complete service characteristics are transferred, but signaling overheads increase
Solution Approach 1:
The patent combines the burst arrival time information transfer with the handover request message that is already being exchanged between base stations. This merging eliminates the need for separate PDU session modification procedures between the SMF and the target base station, thereby reducing signaling overheads while ensuring complete service characteristic information is transferred.
Solution Approach 2:
The source base station acts as an intermediary by determining the burst arrival time based on information it already possesses (second burst arrival time and packet delay budget values) and forwarding it to the target base station in the handover request message. This intermediary approach avoids the need for direct communication between the SMF and target base station for this specific information, reducing signaling overheads.
Data Source
AI summary
A method and communications apparatus for configuring assistance information is provided. A first network device sends a path switch request message to an access and mobility management function (AMF), where the path switch request message is used to request for switching least one radio bearer (RB) of a terminal device from a second network device to the first network device. The first network device receives a path switch request response message from the AMF. The first network device determines, based on the path switch request response message, a first burst arrival time at which a downlink quality of service QoS flow arrives at an ingress of the first network device within a first periodicity, where the first burst arrival time is used for downlink scheduling.