Uplink Channel Scheduling for HARQ-ACK Collision Avoidance
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling overlapping transmissions of physical downlink shared channels (PDSCHs) and physical uplink shared channels (PUSCHs), particularly in scenarios where HARQ-ACK feedback delays are variable and result in collisions, leading to canceled transmissions.
Innovation Solution
A method and apparatus for managing uplink transmissions in wireless communication systems, including dynamic timing adjustments and resource allocation to prevent collisions between different types of uplink channels, such as PUCCH and PUSCH, by employing flexible HARQ-ACK feedback delays and time domain resource allocation tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic scheduling is used to increase flexibility and throughput, then system productivity is improved, but transmission reliability deteriorates due to collisions between uplink channels
Solution Approach 1:
The patent applies preliminary action by determining whether a PUCCH and PUSCH overlap in time domain before transmission occurs. The UE performs this check in advance and proactively selects which channel to transmit based on priority rules, preventing collision issues rather than resolving them after they occur. This advance planning ensures reliable transmission while maintaining dynamic scheduling flexibility.
Solution Approach 2:
The patent changes the parameter of transmission timing by dynamically selecting between different uplink channels (PUCCH or PUSCH) based on overlap conditions. When overlap is detected, the system changes which channel is activated for transmission, using priority-based selection. This parameter change resolves the contradiction by adapting the transmission strategy to avoid collisions while maintaining scheduling efficiency.
2Adaptability or versatility
If HARQ-ACK feedback delay is made variable to improve scheduling flexibility, then adaptability is improved, but transmission reliability deteriorates due to timing collisions
Solution Approach 1:
The patent applies dynamics by making the HARQ-ACK feedback timing flexible rather than fixed. The system dynamically adjusts the feedback delay based on scheduling conditions and channel overlap situations. When PUCCH and PUSCH overlap, the system dynamically selects the appropriate channel for feedback transmission, maintaining adaptability while ensuring reliable delivery through priority-based channel selection.
3Productivity
If uplink channel resources are allocated dynamically to increase productivity, then system throughput is improved, but device complexity increases due to collision management requirements
Solution Approach 1:
The patent changes the parameter of channel selection from a complex resource allocation problem to a simpler priority-based decision. Instead of managing complex resource collisions, the UE changes which channel parameter is active (PUCCH or PUSCH) based on predetermined priority rules. This simplifies the device complexity while maintaining high productivity through dynamic scheduling.
Data Source
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AI summary
The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transmission rate. An apparatus and a communication method thereof in a wireless communication system are provided. The method includes receiving a downlink signal based on one or more downlink channels, and transmitting an uplink signal based on one or more uplink channels. The disclosure can improve communication efficiency.