Sidelink Resource Reassignment via Inter-Terminal Assistance
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Solution Overview
Problem
In the context of NR sidelink communication, reserved resources for transport block (TB) retransmissions are often left unused when the initial transmission or retransmission is successfully received, leading to resource wastage.
Innovation Solution
A resource selection method and device based on an inter-terminal assistance mechanism are introduced, where unused reserved resources are identified and utilized through inter-terminal assistance, improving resource utilization by allowing other terminals to access these unused resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resources are reserved for TB retransmission, then transmission reliability is improved, but resource utilization deteriorates when retransmission is not needed
Solution Approach 1:
The system enables unused reserved resources to automatically become available for other terminals through the inter-terminal assistance mechanism. When a terminal successfully receives a TB, it informs other terminals about the unused reserved resources, allowing those resources to be self-reallocated without central coordination, thus improving resource utilization while maintaining the original reservation mechanism for reliability
Solution Approach 2:
The inter-terminal assistance message acts as an intermediary mechanism that transfers information about unused reserved resources from the receiving terminal to potential transmitting terminals. This mediator enables resource reallocation without requiring central network control, resolving the contradiction between maintaining reservation-based reliability and improving resource utilization
2Reliability
If resources are reserved for up to two retransmissions within 32 slots, then transmission reliability is enhanced, but resource flexibility deteriorates
Solution Approach 1:
The system dynamically adjusts resource usage by allowing reserved resources to transition from a static reserved state to an available state when retransmission is not needed. The inter-terminal assistance mechanism enables real-time adaptation where resources can be reassigned based on actual transmission outcomes, providing both the reliability of initial reservation and the flexibility of dynamic reallocation
Solution Approach 2:
The system changes the status parameter of reserved resources from 'reserved' to 'available' when retransmission is not required. This parameter change is communicated through inter-terminal assistance messages, allowing the resource pool to adapt its composition based on actual transmission needs, thus enhancing both reliability and flexibility
Data Source
AI summary
The present disclosure relates to a resource selection method and device based on inter-terminal assistance mechanism. When the resource selection method is applied to a first terminal, the method includes: receiving a TB from a second terminal, in response to determining that the TB is successfully received and determining that there is an unused reserved resource indicated by SCI carried in the TB by the second terminal, determining an unused reserved resource set based on the unused reserved resource, and performing a resource selection based on inter-terminal assistance mechanism according to the unused reserved resource set.