HARQ-ACK Feedback Overhead Reduction via Bit Block Segmentation
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Solution Overview
Problem
The existing 5G New Radio (NR) systems face challenges in managing high-data-rate and high-reliability traffic, leading to significant Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) feedback overhead, which increases complexity and costs, and is not optimally addressed in current transmission methods.
Innovation Solution
A method is introduced where a first node receives Q1 bit blocks and transmits a first message indicating the associated bit block set for each bit, allowing flexible determination of association relationships between HARQ-ACK information bits and Q1 bit blocks, reducing unnecessary retransmissions and feedback overhead by indicating correct decoding of bit blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional HARQ-ACK feedback methods are used for high-data-rate and high-reliability traffic, then data transmission reliability is improved, but feedback overhead increases significantly
Solution Approach 1:
The patent segments the Q1 bit blocks into multiple groups and uses a first message to indicate the associated bit block set for each bit in the first bit block. This segmentation allows the system to provide detailed acknowledgment feedback for high-reliability traffic while reducing overall overhead by grouping related bit blocks together rather than treating each bit block independently.
Solution Approach 2:
The patent introduces a new dimension of association relationship indication through the first message, which maps bits in the first bit block to sets of bit blocks among Q1 bit blocks. This dimensional change allows compact representation of feedback information by establishing many-to-many relationships between feedback bits and data bit blocks, thereby reducing feedback overhead while maintaining comprehensive acknowledgment coverage.
2Measurement precision
If comprehensive HARQ-ACK feedback is provided for all Q1 bit blocks, then decoding accuracy is improved, but retransmission overhead increases
Solution Approach 1:
The patent enables dynamic adaptation of feedback granularity through the association relationship indicated by the first message. The system can flexibly adjust which bit blocks are grouped together and how many feedback bits are allocated to each group, allowing optimal balance between decoding accuracy and retransmission overhead based on channel conditions and traffic requirements.
Solution Approach 2:
The patent changes the parameter of feedback representation by using association relationships between bits in the first bit block and sets of Q1 bit blocks. Instead of providing one-to-one feedback for each bit block, the system uses compact association indicators that reduce the number of feedback bits required while maintaining the ability to accurately identify which bit blocks were correctly decoded and which require retransmission.
3Productivity
If flexible association relationships are implemented between feedback bits and bit blocks, then resource utilization is improved, but system complexity increases
Solution Approach 1:
The first message serves multiple functions: it indicates the association relationship between feedback bits and bit blocks, enables flexible grouping of Q1 bit blocks, and supports various feedback scenarios (high-data-rate, high-reliability traffic and other traffic types). This multi-functionality allows the same mechanism to achieve resource optimization across different traffic types without requiring separate specialized protocols for each scenario.
Data Source
AI summary
The present application discloses a method and a device in a node for wireless communications. A first receiver receives Q1 bit blocks, Q1 being a positive integer greater than 1; a first transmitter, transmits a first message and a first bit block; herein, the first message is used for indicating an associated bit block set of each bit in the first bit block, and the associated bit block set of each bit in the first bit block comprises at least one bit block among the Q1 bit blocks, and each bit in the first bit block is used for indicating whether a corresponding associated bit block set is correctly decoded.