Multicast Feedback Configuration for Reliable Wireless Transmission
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Solution Overview
Problem
The multicast transmission technology in wireless communication systems, particularly in LTE and NR, lacks support for hybrid automatic repeat request (HARQ) feedback, leading to low reliability and an inability to meet the reliability requirements of certain multicast services.
Innovation Solution
Implementing a feedback mechanism in terminal devices for multicast services by using configuration information to determine when and what type of feedback to send, including mechanisms for prioritizing feedback based on service requirements, signal quality, and network indications to manage resource conflicts and stop feedback when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multicast transmission technology is applied to new radio access technology, then communication capabilities are improved, but reliability cannot meet requirements due to lack of HARQ feedback support
Solution Approach 1:
The patent implements dynamic feedback mechanisms for multicast services by allowing terminal devices to send HARQ feedback information to network devices. The feedback mechanism is dynamically configured through RRC signaling that includes indication information specifying whether feedback should be sent for particular multicast services, enabling adaptability while improving reliability
Solution Approach 2:
The patent changes the parameter of feedback transmission by introducing indication information in RRC configuration that dynamically controls whether HARQ feedback is transmitted for specific multicast services. This parameter change allows the system to adapt between feedback and non-feedback modes based on service requirements
2Reliability
If feedback information is sent for all multicast services, then reliability is improved, but transmission resources are wasted
Solution Approach 1:
The patent applies local quality by configuring feedback requirements individually for different multicast services through separate indication information in RRC configuration. Each multicast service can have its own feedback policy (feedback enabled or disabled) based on its specific reliability requirements, avoiding uniform feedback transmission for all services
Solution Approach 2:
The patent implements partial action by enabling feedback transmission only for specific multicast services that require high reliability, while disabling it for services that do not require feedback. This selective approach avoids the excessive resource consumption of universal feedback transmission
3Measurement precision
If indication information is sent separately from multicast configuration information, then feedback control precision is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the indication information for feedback transmission with the multicast service configuration information in the same RRC signaling message. This combination maintains precise control over feedback requirements while reducing signaling overhead by eliminating separate indication messages
Data Source
AI summary
A network device sends multicast configuration information to a terminal device, where the multicast configuration information corresponds to a first multicast service, the multicast configuration information includes first indication information, and the first indication information indicates that the terminal device sends first feedback information for the first multicast service. The terminal device receives the first multicast service based on the first multicast configuration information, and then sends the first feedback information corresponding to the first multicast service to the network device based on the first indication information in the first multicast configuration information. The feedback mechanism applies to a multicast transmission technology and improves transmission reliability of a multicast service.