Groupcast HARQ Scheduling for Shared Wireless Downlink Resources
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in frequency and time resource utilization when providing groupcast and multicast services, leading to suboptimal data transmission and reception.
Innovation Solution
A method and apparatus are developed to efficiently transmit and receive signals for groupcast and multicast by utilizing hybrid automatic repeat request (HARQ) feedback information, considering the relationship between multicast, unicast, and broadcast data, and processing data based on terminal capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate data transmission is used for each terminal in groupcast and multicast services, then each terminal can receive data individually, but frequency resources and time resources are wasted due to lack of optimization
Solution Approach 1:
The patent merges groupcast and multicast data transmissions by using a common search space and common control resource sets for both service types. This allows multiple terminals to receive data through shared resources rather than separate dedicated resources, thereby improving frequency resource utilization and reducing waste while maintaining individual terminal reception capability
2Productivity
If separate data transmission is used for each terminal in groupcast and multicast services, then each terminal can receive data individually, but time resources are wasted due to lack of optimization
Solution Approach 1:
The patent combines the scheduling of groupcast and multicast data in the same time resources by using common control resource sets and a unified search space. This merging approach allows simultaneous or coordinated transmission to multiple terminals without requiring separate time slots, thereby reducing time resource waste and improving overall transmission efficiency
3Productivity
If common search space is used for groupcast and multicast, then resource utilization improves, but processing complexity increases for terminals
Solution Approach 1:
The patent segments the common search space by introducing a specific search space set indicator field in the downlink control information. This segmentation allows terminals to identify and process only the relevant portion of the common search space corresponding to their service type (groupcast or multicast), reducing processing complexity while maintaining high resource utilization through the shared search space structure
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate than a 4G communication system such as LTE. According to various embodiments of the present disclosure, a method performed by a transmission apparatus in a wireless communication system may be provided. The method may comprise the steps of: transmitting, via a physical downlink control channel (PDCCH), first control information for scheduling a group common-physical downlink shared channel (GC-PDSCH) via which multicast data is transmitted, including information related to hybrid automatic repeat request (HARQ) feedback for the multicast data; and transmitting, via the PDCCH, second control information for scheduling a physical downlink shared channel (PDSCH) via which unicast data is transmitted, including information related to HARQ feedback for the unicast data.