Multi-PDSCH Scheduling and Single-PUCCH HARQ-ACK Feedback
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Solution Overview
Problem
The communication systems using higher frequency bands face increased downlink and uplink signaling overhead and transmission delays due to separate DCI scheduling for multiple PDSCHs and HARQ-ACKs, which are not efficiently managed in existing technologies.
Innovation Solution
A method and apparatus for scheduling data channels and HARQ feedback that involve receiving DCI to determine PDSCH resources, transmitting HARQ-ACKs through a single PUCCH resource, and using a predefined HARQ-ACK codebook size based on the maximum schedulable PDSCHs, rather than the actual number, to reduce signaling overhead and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate DCI is used for scheduling each PDSCH, then scheduling flexibility is improved, but downlink signaling overhead increases
Solution Approach 1:
The patent combines multiple PDSCH scheduling operations into a single DCI message. Instead of transmitting separate DCI for each PDSCH, the system uses one DCI to schedule multiple PDSCHs by indicating multiple start and length indicator values (SLIVs), thereby reducing downlink signaling overhead while maintaining scheduling flexibility.
Solution Approach 2:
The DCI structure is enhanced to perform multiple scheduling functions simultaneously. A single DCI can schedule multiple PDSCHs with different time-domain resources by including multiple SLIV indications, making the DCI a multi-functional scheduling tool that reduces the total number of DCI messages needed.
2Reliability
If HARQ-ACKs for multiple PDSCHs are transmitted through different PUCCH resources, then feedback reliability is improved, but uplink signaling overhead and transmission delay increase
Solution Approach 1:
The patent merges multiple HARQ-ACK feedback transmissions into a single PUCCH resource. Instead of transmitting separate HARQ-ACKs for each PDSCH through different PUCCHs, the system combines all HARQ-ACK bits into one codebook and transmits them through a single PUCCH, reducing uplink signaling overhead and transmission delay.
Solution Approach 2:
The HARQ-ACK codebook is segmented into multiple bits, where each bit corresponds to a specific PDSCH. This segmentation allows the system to efficiently pack multiple acknowledgment bits into a single transmission, maintaining feedback reliability while reducing the number of separate PUCCH transmissions needed.
3Productivity
If HARQ-ACK codebook size is determined by actual number of PDSCHs, then feedback efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent changes the parameter used to determine HARQ-ACK codebook size from the actual number of PDSCHs to a predefined maximum number of schedulable PDSCHs. This parameter change allows the codebook size to be fixed or semi-fixed, reducing signaling overhead for codebook size indication while maintaining feedback efficiency through proper bit mapping.
Data Source
AI summary
An operation method of a terminal in a communication system may comprise: receiving DCI from a base station; identifying a plurality of start and length indicator values (SLIVs) indicated by a time domain resource assignment field included in the DCI; determining a plurality of PDSCH resources based on the plurality of SLIVs; receiving a plurality of PDSCHs from the base station through the plurality of PDSCH resources; and transmitting, to the base station, a plurality of HARQ-ACKs in response to the plurality of PDSCHs.