HARQ-ACK Codebook Generation for Wireless Feedback Overhead Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the 5G system, there is a need for an effective method to support HARQ-ACK transmission, particularly in reducing overhead and avoiding confusion between the base station and user equipment due to variations in PDCCH and PDSCH configurations and delays in HARQ-ACK feedback.
Innovation Solution
A method and equipment for transmitting HARQ-ACK information, which involves detecting PDCCH and PDSCH, determining the HARQ-ACK occasion and number of bits per slot, generating an HARQ-ACK codebook, and transmitting this information, while reducing feedback overhead and avoiding confusion by configuring slot patterns and monitoring occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK feedback is transmitted for every PDSCH reception, then reliability of data transmission is improved, but feedback overhead increases
Solution Approach 1:
The patent applies partial action by transmitting HARQ-ACK feedback only when necessary. The UE determines whether to feed back HARQ-ACK information based on whether it successfully decoded the PDSCH or needs retransmission, rather than always transmitting feedback. This reduces unnecessary feedback transmissions while maintaining reliable data transmission when needed.
Solution Approach 2:
The patent implements dynamic HARQ-ACK feedback transmission where the UE adaptively determines whether to transmit feedback based on current channel conditions and decoding results. The feedback transmission is dynamic rather than static, allowing the system to adjust feedback overhead based on actual transmission needs and channel quality.
2Adaptability or versatility
If slot patterns and monitoring occasions are configured flexibly, then adaptability to different scenarios is improved, but device complexity increases
Solution Approach 1:
The patent segments the slot structure into different types (first type slots with PDCCH monitoring, second type slots without monitoring) and configures different HARQ-ACK feedback behaviors for each slot type. This segmentation allows flexible adaptation to different scenarios while simplifying the decision-making process by providing clear rules for each slot category.
Solution Approach 2:
The patent changes key parameters such as slot type indicators, PDCCH monitoring configurations, and HARQ-ACK feedback timing to achieve flexibility. By dynamically adjusting these parameters based on traffic patterns and channel conditions, the system adapts to different scenarios without requiring complex reconfiguration of the entire system.
3Productivity
If HARQ-ACK feedback delay is reduced, then productivity of data transmission is improved, but reliability may worsen due to timing synchronization issues
Solution Approach 1:
The patent performs preliminary configuration of slot patterns and HARQ-ACK timing relationships before actual data transmission. The base station pre-configures the UE with slot type indicators and feedback timing information, allowing the UE to prepare for timely feedback transmission without last-minute delays. This preliminary setup ensures both fast feedback and proper timing synchronization.
Solution Approach 2:
The patent implements a feedback mechanism where the UE transmits HARQ-ACK information at predetermined timings based on configured slot patterns. The feedback timing is carefully coordinated between base station and UE to ensure synchronization while minimizing delay. The system uses feedback timing indicators to align the UE's feedback transmission with the base station's expected reception times.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present invention provides a method of a base station for supporting an inter-system handover from an evolved packet system (EPS) system to a 5th generation (5G) system. The present application provides a method for transmitting HARQ-ACK information, including steps of: detecting, by a UE, a PDCCH and receiving a PDSCH scheduled by the PDCCH; for one slot of one carrier, determining, according to a configured slot pattern and a configured PDCCH monitoring occasion, the HARQ-ACK occasion and the number of HARQ-ACK bits occupied by the one slot; and, generating, by the UE, an HARQ-ACK codebook according to the HARQ-ACK occasion and the number of HARQ-ACK bits occupied by the one slot, and transmitting HARQ-ACK information. By the method of the present invention, the number of HARQ-ACK bits to be fed back within each slot is reduced, and the feedback overhead is reduced; moreover, the number of bits of the generated HARQ-ACK codebook changes semi-statically, so that the confusion between a base station and a UE is avoided.