Base Station Anchor Transfer for RRC Inactive UL Positioning
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Solution Overview
Problem
In the RRC_inactive state, uplink positioning fails due to the LMF and AMF not recognizing the UE's state or serving base station, leading to the anchor point base station's inability to allocate SRS resources.
Innovation Solution
The anchor point base station requests SRS resource allocation from the serving base station and performs anchor point relocation, utilizing existing Xn interface messages or dedicated interface messages to facilitate reference signal resource allocation and air interface procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LMF triggers a UL positioning procedure for UE in RRC_inactive state, then positioning function is provided, but the LMF and AMF do not know the UE state or serving base station, causing the anchor point base station to be unable to allocate SRS resources and resulting in uplink positioning failure
Solution Approach 1:
The patent applies preliminary action by having the anchor point base station proactively obtain UE context information and serving base station information before the positioning procedure fails. When the LMF sends an SRS resource allocation request, the anchor point base station first retrieves the UE's RRC inactive state information and serving base station details from stored context, ensuring this information is available before allocation decisions are made, thereby preventing positioning failure
Solution Approach 2:
The patent uses the anchor point base station as an intermediary that bridges the information gap between the LMF and the actual serving base station. The anchor point base station receives the SRS resource allocation request from the LMF, then uses this intermediary role to retrieve and process UE context information, and finally allocates resources while coordinating with the serving base station, thus solving the information asymmetry problem
2Device complexity
If the anchor point base station allocates SRS resources without knowing the UE is in RRC_inactive state, then resource allocation procedure is simplified, but the allocation fails because the anchor point base station cannot properly allocate resources to inactive UEs
Solution Approach 1:
The patent applies preliminary action by having the anchor point base station pre-obtain and store UE context information including the RRC state and serving base station details before the resource allocation request arrives. When the LMF sends the SRS resource allocation request, the anchor point base station already has the necessary information to proceed with allocation, eliminating the need for complex additional signaling while ensuring allocation success
Solution Approach 2:
The patent implements feedback by having the anchor point base station check the UE's RRC state and serving base station information from stored context, then use this feedback information to determine the appropriate allocation procedure. The system feedbacks the UE state information to the allocation logic, enabling the anchor point base station to adapt its allocation strategy based on the UE being in RRC_inactive state, thus ensuring successful allocation
Data Source
AI summary
Provided in the embodiments of the present disclosure are an information transmission method and apparatus, and a storage medium. The method comprises: a serving base station receiving first information sent by an anchor base station, wherein the first information is sent by the anchor base station to the serving base station after the anchor base station receives second information sent by an LMF network element, the first information is used for requesting reference-signal resource allocation for a UE and performing anchor transfer, and the second information is used for requesting SRS resource allocation for the UE.