NR V2X Transport Block Transmission via HARQ Process ID
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Solution Overview
Problem
A UE that has not completed transmission of a first transport block based on a specific sidelink hybrid automatic repeat request (HARQ) process ID needs to determine which transport block to transmit during a second TB transmission through mode 1 configured grant (CG) resources with the same sidelink HARQ process ID.
Innovation Solution
The UE identifies the appropriate transport block to transmit by using control information, including sidelink HARQ process ID information, to determine the correct CG resources for the second TB transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE uses mode 1 configured grant resources with the same sidelink HARQ process ID for retransmission, then resource allocation efficiency is improved, but ambiguity arises in identifying which transport block to transmit
Solution Approach 1:
The patent introduces a feedback mechanism where the network device provides indication information to the UE, specifying which transport block should be transmitted on the configured grant resource. This feedback loop resolves the ambiguity by giving explicit instructions from the network about the intended transport block selection.
Solution Approach 2:
The patent introduces indication information as an intermediary element that mediates between the UE's transmission needs and the network's resource allocation decisions. This intermediary carries the specific instruction about which transport block to send, bridging the information gap without requiring complex UE-side decision logic.
2Speed
If the UE autonomously determines transport block selection, then transmission speed is improved, but transmission reliability deteriorates due to potential errors
Solution Approach 1:
The indication information acts as an intermediary that provides authoritative guidance to the UE, ensuring autonomous operation maintains speed while reliability is preserved through network validation. The UE quickly selects the indicated transport block without complex processing, while the network ensures the indication is correct.
Solution Approach 2:
The UE performs self-service by autonomously selecting and transmitting the indicated transport block based on the network's indication information. This maintains transmission speed through UE autonomy while the network's indication ensures reliability, creating a balanced self-service mechanism.
3Measurement precision
If the network provides detailed control information for each transport block, then transmission accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential indication information needed for transport block identification from the full set of possible control parameters. By taking out only the necessary identification element rather than transmitting complete transport block descriptors, the system achieves precise identification with minimal signaling overhead.
Solution Approach 2:
The indication information serves as a lightweight, disposable signaling element that provides precise transport block identification without the overhead of persistent or complex control structures. It's a simple, low-cost information carrier that fulfills its purpose and can be discarded after use.
Data Source
AI summary
Provided is a method for a first device to perform wireless communication. The method may include the steps of: receiving a configured grant from a base station; transmitting a first transport block through a first sidelink resource related to a first hybrid automatic repeat request (HARQ) process ID and allocated by the configured grant; failing to transmit the first transport block; and transmitting a second transport block through a second sidelink resource related to a second HARQ process ID and allocated by the configured grant, on the basis of the second HARQ process ID related to the second sidelink resource being the same as the first HARQ process ID.