Groupcast HARQ Feedback Processing in Wireless UEs
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Solution Overview
Problem
In wireless communication systems, providing a groupcast service efficiently is challenging due to communication resource inefficiency when separate data transmission/reception is used for each user equipment (UE).
Innovation Solution
A method and device for efficiently transmitting and receiving data in a wireless communication system supporting groupcast, which includes transmitting hybrid automatic repeat request (HARQ) feedback information and processing data for user equipment (UE) when receiving groupcast and multicast data, while considering the relationship between data for groupcast/multicast and unicast/broadcast data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate data transmission/reception is used for each UE to provide groupcast service, then individual data delivery is achieved, but communication resource inefficiency occurs
Solution Approach 1:
The patent combines groupcast data transmission with unicast data transmission by allowing a UE to receive both types of data simultaneously through multiple receivers. The groupcast data is received through a first receiver while unicast data is received through a second receiver, enabling both individual and collective data delivery without sacrificing communication resource efficiency
Solution Approach 2:
The patent segments the data reception function into multiple receivers within a single UE. The first receiver is dedicated to groupcast data while the second receiver handles unicast data, allowing parallel processing and eliminating the need to choose between groupcast efficiency and individual delivery reliability
2Reliability
If HARQ feedback information is transmitted for groupcast data, then data reliability is improved, but communication overhead increases
Solution Approach 1:
The patent makes the second receiver (originally dedicated to unicast data) capable of receiving both unicast and groupcast data. This multi-functionality allows the UE to transmit HARQ feedback for groupcast data through the same uplink resources used for unicast feedback, thereby improving data reliability without increasing communication overhead
3Adaptability or versatility
If a UE receives both groupcast and unicast data simultaneously, then service versatility is improved, but processing complexity increases
Solution Approach 1:
The patent divides the data reception task into separate functional blocks: a first receiver for groupcast data and a second receiver for unicast data. This segmentation allows the UE to process multiple data types simultaneously without increasing processing complexity, as each receiver handles its designated data type independently
Data Source
AI summary
Disclosed is a method performed by a user equipment (UE) in a wireless communication system, including receiving, from a base station, downlink control information (DCI) on a physical downlink control channel (PDCCH), the DCI scheduling downlink data for the UE, receiving the downlink data on a physical downlink shared channel (PDSCH) based on the received DCI, and transmitting, to the base station, hybrid automatic repeat request acknowledgement (HARQ-ACK) information in response to the reception of the downlink data, wherein a specific PDSCH processing capability associated with the transmission of the HARQ-ACK information is not applied to the PDSCH scheduled for the UE in case that the downlink data is multicast data.