HARQ-ACK Codebook Generation in 5G Wireless Systems
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Solution Overview
Problem
In 5G wireless communication systems, the delay between Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH, and the corresponding Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) transmission delay, poses challenges in efficiently managing HARQ-ACK feedback, leading to confusion between base stations and User Equipment (UE) and increased overhead.
Innovation Solution
A method for determining the HARQ-ACK occasion and number of HARQ-ACK bits for each slot, involving configuration of slot patterns, PDCCH monitoring occasions, and Code Block Group (CBG) based transmissions, to generate an HARQ-ACK codebook and reduce feedback overhead, thereby avoiding confusion and optimizing HARQ-ACK transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the delay between PDCCH and PDSCH is reduced to improve transmission efficiency, then productivity is improved, but the complexity of managing HARQ-ACK feedback increases and confusion between base station and UE occurs
Solution Approach 1:
The patent segments the HARQ-ACK feedback management by introducing separate timing indicators for different HARQ processes. Each HARQ process has its own timing relationship defined between PDCCH, PDSCH, and HARQ-ACK transmission, allowing independent control and avoiding confusion in fast transmission scenarios
Solution Approach 2:
The patent establishes preliminary timing relationships and configurations for HARQ-ACK feedback before actual data transmission occurs. By pre-defining the timing indicators and feedback opportunities, the system prepares the feedback management structure in advance, reducing complexity during high-speed transmission operations
2Reliability
If HARQ-ACK feedback is transmitted more frequently to improve reliability, then reliability is improved, but the feedback overhead increases
Solution Approach 1:
The patent implements dynamic HARQ-ACK feedback timing where the feedback opportunity is determined by timing indicators that can be adjusted based on transmission conditions. This allows the system to optimize feedback frequency dynamically - transmitting more frequently when needed for reliability while reducing overhead during stable conditions
Solution Approach 2:
The patent changes the timing parameters of HARQ-ACK feedback transmission by introducing configurable timing indicators (K1, K2 values) that define the relationship between PDCCH, PDSCH, and HARQ-ACK. By adjusting these parameters, the system can control feedback frequency to balance reliability requirements against overhead constraints
Data Source
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AI summary
The present disclosure relates to a communication method and system for converging a 5 th-Generation (5G) communication system for supporting higher data rates beyond a 4 th-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.