PUCCH Resource Allocation for HARQ-ACK Feedback in 5G Uplink
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Solution Overview
Problem
In 5G wireless communication systems, there is a challenge in efficiently transmitting uplink control information (UCI) due to inconsistencies in slot patterns and varying processing times across user equipment (UE), which affects the timing and resource allocation for HARQ-ACK feedback, leading to potential delays and inefficiencies.
Innovation Solution
A method for determining the Physical Uplink Control Channel (PUCCH) resource for transmitting HARQ-ACK information based on downlink and uplink bandwidth part (BWP) slot lengths, HARQ-ACK codebook information, and UE processing capabilities, allowing for flexible allocation and reduction of processing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed slot patterns are used for downlink and uplink transmissions, then system simplicity is maintained, but transmission efficiency deteriorates due to inability to adapt to varying UE processing capabilities
Solution Approach 1:
The patent applies dynamics by making the slot pattern flexible rather than fixed. The network can dynamically indicate whether a slot is a downlink slot, uplink slot, or flexible slot, allowing the system to adapt slot patterns based on UE processing capabilities and traffic conditions, thereby improving transmission efficiency without excessive complexity
Solution Approach 2:
The patent changes the parameter of slot pattern configuration from static to dynamic. By introducing different slot types (downlink, uplink, flexible) and allowing dynamic indication through downlink control information, the system can adjust slot patterns to match varying processing capabilities, resolving the contradiction between efficiency and complexity
2Loss of time
If early PUCCH transmission is scheduled to reduce feedback delay, then responsiveness is improved, but processing time requirements may not be met by the UE
Solution Approach 1:
The patent uses dynamic slot type indication to flexibly adjust the timing relationship between PDSCH and PUCCH. By indicating flexible slots where UEs do not perform uplink transmission, the system allows UEs sufficient processing time while still achieving timely feedback through optimized slot allocations
Solution Approach 2:
The patent applies preliminary action by pre-configuring slot patterns and pre-indicating flexible slots before actual data transmission. This allows UEs to know in advance when uplink transmission will be postponed, enabling proper processing time allocation while maintaining overall timing efficiency
3Productivity
If all UEs transmit UCI in every slot, then channel utilization is maximized, but power consumption and interference increase
Solution Approach 1:
The patent implements periodic action by creating regular patterns of flexible slots where uplink transmission is postponed. Instead of continuous UCI transmission in every slot, UEs follow a periodic pattern determined by the indicated flexible slots, reducing power consumption while maintaining channel utilization through optimized transmission timing
Solution Approach 2:
The patent applies local quality by allowing different transmission behaviors in different slots. Some slots are designated for uplink transmission while others are flexible slots where transmission is postponed, creating localized variations in transmission activity that reduce overall power consumption and interference while maintaining necessary channel utilization
4Reliability
If flexible slots are introduced to accommodate processing requirements, then processing compliance is improved, but slot pattern complexity and scheduling difficulty increase
Solution Approach 1:
The patent applies universality by making flexible slots multi-functional. These slots can serve as downlink slots when needed or be postponed to future uplink slots based on UE processing requirements. This universal flexibility is controlled through standardized downlink control information, managing complexity through a unified control mechanism rather than separate handling for each case
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 application provides a method for transmitting uplink control information (UCI), comprising: detecting a physical el downlink control channel (PDCCH) and receiving a physical downlink shared channel (PDSCH) scheduled by the PDCCH, by a user equipment (UE); determining, by the UE, hybrid automatic repeat request acknowledge (HARQ-ACK) information to be fed back and physical uplink control channel (PUCCH) resource for transmitting the UCI according to at least one of the following: slot lengths of downlink bandwidth part (BWP) and uplink BWP, HARQ-ACK codebook information and UE's processing capability requirements; transmitting, by the UE, the HARQ-ACK information on the PUCCH resource. The method of the present invention may support a method for determining the HARQ-ACK codebook while multiple PUCCH resources and multiple slot lengths.