LCP Procedure with Inter-UE Coordination for Sidelink
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Solution Overview
Problem
In wireless communication networks, the current Logical Channel Prioritization (LCP) procedure often selects a different destination for sidelink transmission than intended by the physical layer during sensing/resource selection, leading to inefficiencies and the need for redundant resource selection processes.
Innovation Solution
Implementing a method where the Medium Access Control (MAC) layer sets the destination for sidelink transmissions based on Inter-User Equipment (UE) coordination information, skipping the initial destination selection step and using the destination ID indicated by the physical layer, and managing latency bounds for Inter-UE coordination reports to ensure timely and accurate resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MAC layer selects destination based on highest logical channel priority during LCP procedure, then the destination selection follows standard priority rules, but it may select a different destination than the one whose IUC information was used during PHY sensing/resource selection
Solution Approach 1:
The PHY layer performs sensing and resource selection in advance, identifying the intended destination before the MAC layer performs LCP. The PHY layer provides the intended destination ID to the MAC layer prior to destination selection, allowing the MAC layer to align its destination choice with the PHY layer's pre-selected destination, ensuring consistency between layers.
Solution Approach 2:
The PHY layer feeds back the intended destination ID information to the MAC layer after completing sensing and resource selection. This feedback mechanism allows the MAC layer to receive information about which destination the PHY layer intends to use, enabling the MAC layer to adjust its destination selection to match the PHY layer's choice, thereby ensuring consistency.
2Productivity
If the MAC layer uses candidate resources provided by PHY for SL transmission, then resource allocation is optimized based on PHY sensing, but the destination may not match the destination whose IUC information was considered
Solution Approach 1:
The PHY layer determines the intended destination and selects candidate resources in advance before MAC layer processing. By providing both the candidate resources and the intended destination ID to the MAC layer beforehand, the MAC layer can use the pre-selected resources while ensuring the transmission is directed to the correct destination, preventing loss of destination alignment information.
Solution Approach 2:
The PHY layer provides feedback to the MAC layer indicating which destination's IUC information was used during resource selection. This feedback ensures that the MAC layer has the necessary destination alignment information to correctly associate the candidate resources with the intended destination, preventing information loss about destination correspondence.
3Ease of operation
If the LCP procedure selects a different destination than PHY intended, then MAC follows its own selection criteria, but redundant resource selection processes are required
Solution Approach 1:
The PHY layer performs preliminary sensing and resource selection, identifying both candidate resources and the intended destination. By providing this information to the MAC layer in advance, the MAC layer can directly use the pre-determined destination without needing to perform redundant destination selection, eliminating wasteful re-processing while maintaining operational independence.
Solution Approach 2:
The PHY layer feeds back the intended destination ID to the MAC layer, allowing the MAC layer to verify and adopt the PHY layer's destination selection. This feedback mechanism enables the MAC layer to skip redundant destination selection processes and directly proceed with transmission using the aligned destination, reducing processing time while maintaining ease of operation.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for LCP procedure considering IUC schemes. An apparatus (600) includes a memory (610) and a processor (605) coupled to the memory (610). The processor (605) is configured to cause the apparatus (600) to determine a latency bound for transmission of a SL inter-UE coordination report via a MAC CE, maintain a report timer for transmitting the inter-UE coordination report via the MAC CE according to the determined latency bound, and transmit the inter-UE coordination information via the MAC CE based on the report timer.