PUCCH Configuration for HARQ-ACK Ambiguity in Multicast Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in accurately transmitting and receiving HARQ-ACK information, particularly in multicast scenarios, leading to ambiguity and inefficiencies in resource allocation and data transmission.
Innovation Solution
The method involves configuring physical uplink control channels (PUCCHs) to transmit HARQ-ACK information, allowing for ACK/NACK-based and NACK-only based reporting configurations for multicast physical downlink shared channels (PDSCHs), which enables precise timing and multiplexing of HARQ-ACKs, thereby ensuring accurate interpretation by the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK information is transmitted for multicast PDSCH in current wireless communication systems, then data transmission occurs, but ambiguity in HARQ-ACK interpretation arises leading to transmission errors
Solution Approach 1:
The patent segments HARQ-ACK information into distinct types (ACK-only, NACK-only, ACK/NACK) with different transmission behaviors. Each type is associated with specific PUCCH resource configurations, allowing the base station to clearly distinguish between different HARQ-ACK states and avoid interpretation ambiguity.
Solution Approach 2:
Different PUCCH resource configurations are applied locally based on the HARQ-ACK type. The terminal selects specific PUCCH resources from configured sets depending on whether it needs to transmit ACK-only, NACK-only, or ACK/NACK information, ensuring that each HARQ-ACK state uses appropriate transmission characteristics.
2Productivity
If multiple HARQ-ACK information are multiplexed on the same PUCCH, then resource efficiency improves, but interpretation ambiguity increases
Solution Approach 1:
Multiple HARQ-ACK information are merged into a single PUCCH transmission when they share the same HARQ-ACK type and are associated with the same PUCCH resource configuration. This combining approach maintains resource efficiency while preserving interpretability because the base station knows all multiplexed ACKs or NACKs belong to the same category.
Solution Approach 2:
Instead of trying to distinguish between different HARQ-ACK types within a single PUCCH resource, the patent inverts the approach by using different PUCCH resources for different HARQ-ACK types. This allows clear differentiation while still enabling efficient multiplexing within each resource type.
3Adaptability or versatility
If PUCCH configuration is not differentiated for multicast PDSCH, then system complexity is reduced, but service requirements cannot be met
Solution Approach 1:
The PUCCH configuration mechanism is designed to be universal, working for both unicast and multicast PDSCH scenarios. The same framework of PUCCH resource sets and HARQ-ACK type associations applies to different service types, providing adaptability without requiring entirely separate configuration systems.
Solution Approach 2:
The system dynamically selects appropriate PUCCH configurations based on the multicast service requirements and terminal capabilities. Configuration parameters such as the number of PUCCH resource sets and HARQ-ACK types can be adjusted according to network conditions and service demands, providing flexibility while managing complexity.
Data Source
AI summary
Disclosed are a method and a device for transmitting or receiving HARQ-ACK information in a wireless communication system. A method for transmitting HARQ-ACK information according to an embodiment of the present disclosure may comprise the steps of: receiving, from a base station, first physical uplink control channel (PUCCH) configuration information related to an ACK/negative ACK (NACK)-based HARQ-ACK report for a multi-cast physical downlink shared channel (PDSCH) or second PUCCH configuration information related to an NACK-only-based HARQ-ACK report for the multi-cast PDSCH for each one or more uplink bandwidth parts (BWPs) configured for a terminal; receiving, from the base station, downlink control information (DCI) for scheduling of a first multi-cast PDSCH; receiving the first multi-cast PDSCH from the base station on the basis of the DCI; and transmitting, to the base station, first HARQ-ACK information for the first multi-cast PDSCH on a first PUCCH.