HARQ-ACK Codebook Filtering for Cell DTX and DRX Periods
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication systems face inefficiencies in HARQ-ACK feedback due to cell discontinuous transmission (DTX) periods, leading to excessive HARQ-ACK codebook sizes and energy consumption, particularly in 5G networks with advanced services and increased network density.
Innovation Solution
Configuring a hybrid automatic repeat request (HARQ) acknowledgement codebook by omitting resource allocations that overlap with DTX periods, specifically for Type 1 and Type 2 HARQ-ACK codebooks and semi-persistent scheduling (SPS) HARQ-ACK feedback, based on cell DTX configurations and network indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If HARQ-ACK codebook includes all resource allocations regardless of DTX periods, then feedback completeness is maintained, but codebook size and energy consumption increase excessively
Solution Approach 1:
The patent extracts and removes resource allocations that overlap with DTX periods from the HARQ-ACK codebook. By identifying and excluding these irrelevant entries, the codebook size is reduced without compromising the validity of remaining feedback information, directly resolving the contradiction between codebook size and energy consumption
Solution Approach 2:
The patent changes the parameter of codebook configuration by introducing DTX period information as a filtering criterion. This parameter change enables dynamic adjustment of codebook content based on transmission state, allowing the system to adapt codebook size to actual needs and reduce energy consumption during DTX periods
2Reliability
If HARQ-ACK feedback is transmitted continuously, then reliability is maintained, but energy consumption increases during DTX periods
Solution Approach 1:
The patent implements periodic action by aligning HARQ-ACK feedback transmission with active transmission periods. Feedback is transmitted only when the cell is in active state (non-DTX periods), creating a periodic transmission pattern that maintains reliability during active periods while saving energy during DTX periods
3Quantity of substance
If resource allocations overlapping with DTX periods are included in codebook, then feedback completeness is maintained, but network energy efficiency decreases
Solution Approach 1:
The patent extracts and removes resource allocations that overlap with DTX periods from the HARQ-ACK codebook. By identifying and excluding these irrelevant entries, the codebook size is reduced without compromising the validity of remaining feedback information, directly resolving the contradiction between codebook size and energy consumption
Solution Approach 2:
The patent converts the harmful effect of DTX periods (which cause transmission gaps) into a beneficial filtering mechanism. The DTX period information is used to identify and exclude irrelevant resource allocations, transforming the transmission gap problem into a codebook optimization opportunity that improves network energy efficiency
Data Source
AI summary
There is provided an apparatus. The apparatus comprises: means for obtaining information of one or more non-active periods of a cell that is in discontinuous transmission; means for receiving at least one resource allocation for the apparatus; means for determining one or more resources of the at least one resource allocation that overlap fully or in part with the one or more non-active periods of the cell; and means for configuring a hybrid automatic repeat request acknowledgement codebook based at least in part on the determining one or more resources of the at least one resource allocation that overlap fully or in part with the one or more non-active periods of the cell.