Multicast PDSCH Coding With Selective HARQ-ACK Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting multicast data to multiple devices, managing transmission errors, and reducing Physical Uplink Control Channel (PUCCH) overhead for Hybrid Automatic Repeat reQuest (HARQ-ACK) feedback.
Innovation Solution
A method and device for multicast wireless transmission in a wireless communication system that includes receiving synchronization signals and control information from a base station, processing code block indicators and resource allocation, generating Hybrid Automatic Repeat reQuest (HARQ-ACK) feedback based on error detection, and transmitting this feedback to the base station, while optimizing resource usage and reducing PUCCH overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multicast transmission is implemented in wireless communication systems, then communication capacity is improved, but transmission error management complexity increases
Solution Approach 1:
The patent segments the code block acknowledgment process by introducing additional PCBs that are separately transmitted from basic PCBs. This segmentation allows the system to handle transmission errors more efficiently by enabling selective retransmission of only the additional PCBs when errors occur, rather than managing all code blocks as a single unit, thus reducing error management complexity while maintaining improved communication capacity.
Solution Approach 2:
The patent introduces an intermediary mechanism where additional PCBs serve as a mediator between the basic PCBs and the data transmission process. These additional PCBs carry redundancy information that facilitates error recovery without requiring complex error management protocols, thereby resolving the contradiction between improved communication capacity and reduced error management complexity.
2Reliability
If HARQ-ACK feedback is transmitted by multiple UEs to base station, then transmission reliability is improved, but PUCCH overhead increases
Solution Approach 1:
The patent extracts the acknowledgment feedback process into separate components by distinguishing between basic PCBs and additional PCBs. Multiple UEs transmit HARQ-ACK feedback only for the additional PCBs rather than all code blocks, which reduces the quantity of feedback information (PUCCH overhead) while maintaining transmission reliability through the selective acknowledgment mechanism.
Solution Approach 2:
The patent applies partial action by having multiple UEs transmit HARQ-ACK feedback selectively for only the additional PCBs rather than all code blocks. This partial feedback approach reduces PUCCH overhead significantly while still improving transmission reliability, as the additional PCBs contain the critical redundancy information needed for error recovery.
3Reliability
If additional parity code blocks are transmitted for error recovery, then transmission reliability is improved, but resource usage efficiency decreases
Solution Approach 1:
The patent changes the parameter structure of code block transmission by dividing code blocks into basic PCBs and additional PCBs with different functions. The additional PCBs contain parity information for error recovery, while basic PCBs carry primary data. This parameter change allows the system to improve transmission reliability through targeted error recovery mechanisms without proportionally increasing resource usage, as resources are allocated efficiently based on the specific needs of each PCB type.
Data Source
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AI summary
A method according to an embodiment of the present disclosure may comprise receiving one or more synchronization signals from a base station, receiving control information from the base station, receiving, from the base station, a radio resource control (RRC) message including first information for an additional parity code block (PCB) indicator and a number of first additional PCBs and second information for a number of first basic PCBs and a maximum value of a number of code blocks (CBs), receiving, from the base station, downlink control information (DCI) including third information for resource allocation information and fourth information for the additional PCB indicator, acquiring information for a first number which is a number of total CBs, information for a second number which is a number of second additional PCBs, information for a third number which is a number of second basic PCBs, and information for a fourth number which is a number of data code blocks (DCBs), based on at least one of the first information, the second information, the third information, or the fourth information, receiving, from the base station, a physical downlink shared channel (PDSCH) based on the second number of second additional PCBs, the third number of second basic PCBs, and the fourth number of DCBs, generating a Hybrid Automatic Repeat reQuest Acknowledgement (HARQ-ACK) feedback based on a number of DCBs in which an error occurs among the fourth number of DCBs included in the PDSCH, and transmitting the HARQ-ACK feedback to the base station.