Sidelink HARQ and MCS Selection Using Partial Sensing
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G NR, face challenges in optimizing resource allocation for sidelink transmissions, especially in Mode 2 where UEs autonomously select resources, leading to inefficiencies and increased power consumption due to continuous channel sensing.
Innovation Solution
Implementing partial sensing techniques that allow UEs to identify available resources for sidelink transmissions by selecting HARQ retransmission parameters and MCS based on the number of candidate slots, available resources within those slots, and adjusted RSRP thresholds, reducing the need for continuous channel monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous channel sensing is performed for resource selection in Mode 2, then resource allocation reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies partial sensing by selecting a subset of candidate slots from the total sensing window instead of continuously monitoring all slots. The UE performs partial sensing on Y candidate slots where Y is less than the total number of slots in the sensing window, achieving a balance between resource allocation reliability and power consumption by performing only the necessary sensing actions rather than exhaustive continuous monitoring
Solution Approach 2:
The patent implements periodic partial sensing where the UE performs sensing operations at periodic intervals rather than continuously. By selecting specific candidate slots periodically within the sensing window and performing sensing only in those slots, the system reduces power consumption while maintaining adequate resource allocation reliability through regular periodic monitoring
2Use of energy by moving object
If partial sensing is implemented to reduce power consumption, then energy efficiency is improved, but resource selection accuracy may deteriorate
Solution Approach 1:
The patent changes the parameter of sensing window configuration by allowing flexible selection of the number of candidate slots Y and the sensing window size. By adjusting these parameters, the system can adapt the sensing precision to match the required energy efficiency targets, ensuring adequate resource selection accuracy while maintaining improved energy efficiency through optimized partial sensing configurations
Solution Approach 2:
The patent incorporates feedback mechanisms where the UE monitors the outcomes of partial sensing and adjusts future sensing strategies accordingly. By using feedback from previous sensing results and transmission outcomes, the system can refine its candidate slot selection and maintain resource selection accuracy despite performing only partial sensing operations
3Productivity
If HARQ retransmission parameters are selected based on partial sensing, then transmission efficiency is improved, but complexity of parameter selection increases
Solution Approach 1:
The patent applies parameter changes by dynamically selecting HARQ retransmission parameters based on the results of partial sensing. The system adjusts the number of HARQ retransmissions, MCS indices, and other transmission parameters according to the channel conditions observed in the selected candidate slots, improving transmission efficiency while managing complexity through parameter adaptation rather than complex algorithms
Solution Approach 2:
The patent performs preliminary sensing and parameter selection in advance before actual transmission. By selecting HARQ retransmission parameters based on preliminary partial sensing results from candidate slots, the system prepares transmission parameters beforehand, improving transmission efficiency through proactive parameter selection while reducing real-time complexity
Data Source
AI summary
This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for retransmission and selection of HARQ and MCS based on partial sensing. A UE may perform a partial sensing procedure to identify one or more available resources for a sidelink transmission of the UE and transmit the sidelink transmission on a resource selected from the one or more available resources. The sidelink transmission may include at least one of a HARQ retransmission parameter or an MCS selected for the sidelink transmission based on at least one of a number of candidate slots for the partial sensing procedure, a quantity of the one or more available resources within the number of candidate slots, or a number of times that a threshold for a minimum amount of the one or more available resources is increased.