MAC CE Feedback for Sidelink Resource Collision Avoidance
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Solution Overview
Problem
Inconsistent understanding between network-side devices and terminals regarding the activation or deactivation status of configured resources in sidelink grant types leads to resource collisions in communication systems.
Innovation Solution
The implementation of a media access control protocol data unit (MAC PDU) with a media access control control element (MAC CE) to indicate activation, deactivation, or request for activation/deactivation of configured grant resources, ensuring consistent status understanding between network-side devices and terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network-side device transmits deactivation signaling for a configured sidelink grant type 2 resource but the terminal fails to receive or decode it, then the terminal continues to use the resource, but the network-side device believes the resource is released, causing resource collision and interference
Solution Approach 1:
The patent implements a feedback mechanism where the terminal sends acknowledgment information to the network-side device regarding the reception and execution status of activation and deactivation signaling. This feedback loop allows the network-side device to verify whether the terminal has correctly received and processed the signaling, enabling it to determine whether to release or reallocate the resource, thereby preventing resource collisions caused by inconsistent understanding of resource status
Solution Approach 2:
The patent introduces acknowledgment information as an intermediary element that mediates the communication between the network-side device and the terminal. This intermediary carries status information about resource activation and deactivation, allowing both parties to reach a consistent understanding of the resource state without direct conflict, thus resolving the information asymmetry that leads to resource collisions
2Productivity
If the base station reallocates the resource to the Uu interface after transmitting deactivation signaling, then the resource can be reused, but this causes interference between sidelink transmission and transmission over Uu
Solution Approach 1:
The feedback mechanism enables the base station to obtain accurate status information from the terminal before reallocating resources. By verifying whether the terminal has successfully received and executed the deactivation signaling through acknowledgment information, the base station can avoid premature reallocation that would cause interference between sidelink and Uu transmissions while still maintaining high resource utilization efficiency
3Adaptability or versatility
If the terminal autonomously selects a resource in autonomous resource selection mode, then the terminal has flexibility in resource choice, but there is no confirmation mechanism to ensure consistent understanding of resource status between terminal and network-side device
Solution Approach 1:
The patent extends the feedback mechanism to autonomous resource selection mode, where terminals send acknowledgment information about their resource selection and status changes to the network-side device. This allows the network-side device to maintain awareness of terminal resource usage even in autonomous mode, ensuring consistent understanding while preserving terminal flexibility in resource selection
Data Source
AI summary
This disclosure provides an information transmitting method and a terminal. The information transmitting method includes: transmitting a MAC PDU, where the MAC PDU includes a MAC CE, and the MAC CE is used to indicate that a terminal has received activation or deactivation signaling for a configured grant resource, or is used to indicate that a terminal has activated or deactivated a configured grant resource, or is used to request.