Sidelink HARQ NACK Feedback for Base Station Resource Management
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Solution Overview
Problem
In LTE and NR sidelink communication systems, base stations face challenges in efficiently managing sidelink resources due to the lack of accurate information about UE's decision to drop sidelink transmission, leading to inefficient allocation of additional transmission resources.
Innovation Solution
A method where a UE receives information about sidelink bandwidth parts and uplink bandwidth parts from the base station, determines not to perform sidelink transmission, and transmits HARQ NACK using the uplink resource, allowing the base station to efficiently manage sidelink resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station does not receive accurate information about UE's decision to drop sidelink transmission, then the sidelink communication can proceed without additional signaling overhead, but the base station cannot efficiently allocate additional transmission resources
Solution Approach 1:
The patent implements a feedback mechanism where the UE transmits HARQ NACK information to the base station when it decides to drop sidelink transmission. This feedback loop allows the base station to accurately determine when additional resources need to be allocated, resolving the information loss problem while maintaining efficient resource management.
Solution Approach 2:
The patent uses HARQ NACK as an intermediary signal that carries information about the UE's transmission decision. This intermediary mechanism enables the base station to infer the UE's decision to drop transmission without requiring direct signaling, thus solving the information loss issue while minimizing overhead.
2Productivity
If the base station allocates additional transmission resources without accurate UE decision information, then resource allocation can proceed continuously, but resource collisions may occur and allocation efficiency decreases
Solution Approach 1:
The HARQ NACK feedback mechanism provides the base station with accurate information about UE transmission decisions, enabling reliable resource allocation. This feedback ensures the base station can continuously allocate resources without collisions while maintaining high allocation accuracy through real-time information about UE decisions.
3Productivity
If the UE transmits HARQ NACK to indicate dropping sidelink transmission, then the base station can accurately manage resources, but additional signaling overhead is introduced
Solution Approach 1:
The patent uses HARQ NACK as an intermediary signal that serves dual purposes: it provides feedback about transmission decisions and enables accurate resource management. This intermediary approach achieves reliable resource management while keeping signaling overhead minimal by reusing existing HARQ feedback mechanisms.
Data Source
AI summary
Provided are a method for performing wireless communication by a first apparatus, and an apparatus for supporting same. The method may comprise the steps of: receiving, from a first base station, information associated with a sidelink (SL) bandwidth part (BWP); receiving, from the first base station, information associated with an uplink (UL) BWP; receiving, from the first base station, information associated with a first SL resource and information associated with a first UL resource for reporting hybrid automatic repeat request (HARQ) feedback; determining not to perform SL transmission on the basis of the first SL resource on the SL BWP; and on the basis of determining, by the first apparatus, not to perform the SL transmission on the basis of the first SL resource, transmitting, to the first base station, HARQ NACK on the basis of the first UL resource on the UL BWP.