Bistatic Sensing Service Continuity During RAN Handover
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Solution Overview
Problem
Existing wireless networking technologies face challenges in maintaining continuity of sensing services due to user equipment (UE) mobility, particularly in ensuring seamless handovers between radio access network (RAN) nodes and maintaining accurate sensing configurations.
Innovation Solution
The method involves a source RAN node operating in a bistatic mode for a sensing service and transmitting sensing service information, including session identifiers, resource configurations, and data reporting settings, to a target RAN node or an access and mobility management function (AMF) during a handover decision. This ensures that the sensing service is properly handed over and configured at the new RAN node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover decision switches the UE to a target RAN node, then user mobility and connection reliability are improved, but sensing service continuity may be disrupted due to loss of sensing configurations and session information
Solution Approach 1:
The source RAN node performs preliminary action by transmitting sensing service information (including sensing session identifiers, sensing resource configurations, sensing session configurations, and sensing data reporting configurations) to the target RAN node or AMF before the handover is completed. This ensures that the target node receives all necessary sensing configurations in advance, preventing information loss and maintaining sensing service continuity during the handover process.
Solution Approach 2:
The patent introduces an intermediary mechanism where the source RAN node acts as a mediator to transfer sensing service information to either the target RAN node directly or through the AMF. This intermediary transmission ensures that sensing configurations are properly handed over during the handover decision, resolving the contradiction between mobility and information retention.
2Reliability
If sensing service information is transmitted during handover, then sensing service continuity is maintained, but network signaling overhead and complexity increase
Solution Approach 1:
The patent utilizes existing handover signaling messages (handover request, handover request acknowledgment, handover command) to carry sensing service information. By making these existing messages multi-functional (carrying both handover instructions and sensing configurations), the patent avoids creating separate signaling protocols, thus maintaining reliability while minimizing additional signaling complexity.
Solution Approach 2:
The patent merges the transmission of sensing service information with the existing handover signaling flow. Instead of separate signaling for handover and sensing configuration transfer, both functions are combined into the same message exchanges between source RAN node, target RAN node, and AMF, reducing overall signaling overhead and complexity.
Data Source
AI summary
A method includes: operating, by a source radio access network (RAN) node serving a user equipment (UE), in a bistatic mode for a sensing service provided by one or more components of a core network; and based on a handover decision that switches the UE to a target RAN node, transmitting, by the source RAN node, sensing service information to one of the following: the target RAN node, or an access and mobility management function (AMF) of the core network. The sensing service information includes at least one of the following: at least one sensing session identifier corresponding to at least one sensing session for the serving service, a sensing resource configuration for the sensing service, a sensing session configuration for the sensing service, or a sensing data reporting configuration for the sensing service.