HARQ-ACK Codebook Configuration for UE PDSCH Capability
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Solution Overview
Problem
There is a need for effective methods to deliver diverse services in advanced mobile communication systems, particularly in 5G and beyond, considering the increasing complexity and requirements of connected devices and services such as eMBB, URLLC, and mMTC.
Innovation Solution
A method and device for a user equipment (UE) and base station to transmit and receive HARQ-ACK codebooks based on capability information, including slot offset values and maximum PDSCHs per slot, to optimize the transmission and reception of physical downlink shared channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station schedules multiple PDSCHs in one slot to increase data transmission efficiency, then the productivity is improved, but the device complexity increases because the UE must generate HARQ-ACK codebooks for multiple PDSCHs with different slot offsets
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the HARQ-ACK codebook generation parameters based on UE capability. The base station configures different slot offset values (K0, K1, K2) and maximum PDSCH numbers per slot according to the UE's reported capability, allowing the system to adapt the codebook structure to match what the UE can efficiently process, thereby resolving the contradiction between transmission efficiency and processing complexity
Solution Approach 2:
The patent implements dynamics by making the HARQ-ACK codebook configuration adaptive rather than fixed. The system dynamically adjusts the codebook parameters based on real-time UE capability reporting, allowing the base station to optimize the number of PDSCHs per slot and slot offsets according to each UE's processing capabilities, thus balancing productivity improvement with manageable device complexity
2Adaptability or versatility
If the UE processes a maximum number of PDSCHs per slot to support diverse services, then the adaptability is improved, but the loss of time increases due to the additional processing required for HARQ-ACK codebook generation
Solution Approach 1:
The patent applies preliminary action by having the UE report its capability information (maximum PDSCHs per slot, supported slot offsets) to the base station in advance. This allows the base station to pre-configure appropriate HARQ-ACK codebook parameters that match the UE's processing capabilities, so the UE doesn't need to perform complex real-time calculations during actual data transmission, thereby reducing processing time loss while maintaining adaptability
Solution Approach 2:
The patent implements dynamics by allowing the system to adapt the HARQ-ACK codebook configuration based on UE capability. The base station can dynamically adjust the number of PDSCHs per slot and slot offset values according to what the UE can handle, optimizing the balance between service diversity support and processing time requirements for different UE types and service scenarios
Data Source
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AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. More specifically, the present disclosure relates to a method performed by a user equipment (UE) in a wireless communication system, the method comprising the steps of: transmitting, to a base station, capability information on the maximum number of physical downlink shared channels (PDSCHs) that can be received in a single slot by the UE; receiving, from the base station, configuration information including first information including at least one slot offset value between each of reception slots of at least one PDSCH and a transmission slot of a hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook and second information on the maximum number of PDSCHs scheduled to a single slot; determining one or more reception slots of the PDSCHs on the basis of the first information; generating a HARQ-ACK codebook including pieces of HARQ-ACK information corresponding in number to the maximum number of PDSCHs that can be scheduled to each of the determined one or more reception slots of the PDSCHs on the basis of the second information, wherein the HARQ-ACK information is configured for each of the determined one or more reception slots of the PDSCHs; and transmitting the generated HARQ-ACK codebook to the base station.