RRC Inactive State Acknowledgement Feedback for Positioning
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Solution Overview
Problem
Current technologies lack a mechanism for UE to provide acknowledgement feedback for positioning assistance data reception without transitioning from the RRC inactive state, which is essential for power saving and latency reduction in 5G services.
Innovation Solution
The proposed solution involves receiving latency requirements for acknowledgement feedback at a UE in an RRC inactive state and transmitting the acknowledgement based on determined transmission resources and modes without changing the RRC state, allowing for dynamic resource allocation and fast acknowledgement transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transitions to RRC connected state to transmit acknowledgement feedback, then the reliability of feedback transmission is improved, but the power consumption increases and the RRC inactive state is lost
Solution Approach 1:
The acknowledgement feedback transmission is segmented into two independent parts: (1) the RRC resume request message containing positioning assistance data, and (2) the separate acknowledgement feedback message. This segmentation allows the UE to transmit the acknowledgement feedback independently without transitioning to RRC connected state, thus maintaining power saving while ensuring reliable feedback transmission.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network side device (gNB) acts as a mediator to forward the acknowledgement feedback from the UE to the LMF. The gNB receives the acknowledgement feedback in RRC inactive state and forwards it through the existing RAN message, eliminating the need for UE to transition to connected state while ensuring reliable feedback delivery.
2Device complexity
If the UE waits for RRC connection resume to transmit acknowledgement feedback, then the signaling procedure is simplified, but the positioning latency increases
Solution Approach 1:
The patent applies preliminary action by having the UE transmit the acknowledgement feedback immediately after receiving the RRC resume request, before completing the full RRC connection resume procedure. The UE includes the acknowledgement feedback in the RRC resume request message or transmits it separately in RRC inactive state, significantly reducing positioning latency while maintaining signaling simplicity.
Solution Approach 2:
The acknowledgement feedback transmission is made continuous and independent of the RRC connection state transition. The UE can transmit the acknowledgement feedback continuously in RRC inactive state using the existing RAN message, eliminating the waiting time for RRC connection resume and reducing overall positioning latency.
3Reliability
If the network allocates dedicated resources for acknowledgement feedback, then the QoS requirement is improved, but the network complexity increases
Solution Approach 1:
The patent applies universality by making the existing RRC inactive state RAN message serve multiple functions: it carries both the positioning assistance data and the acknowledgement feedback. The network side device forwards the acknowledgement feedback through the same RAN message that is already being used for other purposes, eliminating the need for dedicated resources and reducing network complexity while maintaining QoS requirements.
Data Source
AI summary
Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of the acknowledgement feedback for a positioning in RRC inactive state. The method comprises receiving, at a first device in a radio resource control, RRC, inactive state, information at least indicating a latency requirement for the first device to transmit an acknowledgement feedback for a reception of a message, the message being associated with a positioning of the first device and transmitted from a second device or a fourth device to the first device; and performing the transmission of the acknowledgement feedback for the reception of the message at least based on the information without changing the RRC inactive state. With the solution of the present disclosure, acknowledgement information report can be enabled to guarantee the reliability of positioning assistance data reception. It is benefit for the UE in the aspect of power saving, end-to-end positioning latency reduction and signaling overhead reduction.