PDSCH Multicast HARQ-ACK Modes Balance Reliability and Uplink Overhead
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Solution Overview
Problem
Existing LTE technologies do not support HARQ-ACK feedback for Physical Downlink Shared CHannel (PDSCH) multicast, failing to meet varying reliability and accuracy requirements of different broadcast/multicast services.
Innovation Solution
A method to determine and configure HARQ-ACK feedback modes for PDSCH based on service type, RNTI, or Downlink Control Information (DCI), enabling different services to be assigned appropriate HARQ-ACK feedback modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK feedback is implemented for PDSCH multicast, then reliability of broadcast/multicast services is improved, but uplink feedback overhead increases
Solution Approach 1:
The patent segments the feedback mechanism by introducing different HARQ-ACK feedback modes (first mode without feedback, second mode with feedback) that can be selectively applied to different PDSCH transmissions. The network device can independently configure feedback requirements for different multicast services, dividing the feedback burden and allowing selective feedback only when necessary for reliability.
Solution Approach 2:
The patent changes the feedback parameter by introducing a configurable HARQ-ACK feedback mode indicator that can switch between different feedback behaviors. This parameter change allows the system to adapt feedback requirements based on service type, traffic conditions, and reliability needs, thereby optimizing the balance between reliability improvement and overhead control.
2Device complexity
If a unified HARQ-ACK mechanism is applied to all multicast services, then implementation complexity is reduced, but adaptability to different service requirements deteriorates
Solution Approach 1:
The patent creates a universal HARQ-ACK feedback framework that can serve multiple functions through the configurable feedback mode indicator. The same basic feedback mechanism can operate in different modes (with or without HARQ-ACK feedback) depending on the service requirements, making the system universally applicable to various multicast services while maintaining adaptability through configuration flexibility.
Solution Approach 2:
The patent introduces dynamic configurability where the HARQ-ACK feedback mode can be changed based on different service types, traffic conditions, and network states. The network device can dynamically adjust feedback requirements for different multicast services, allowing the system to adapt to varying service demands without requiring fundamentally different mechanisms for each service type.
3Reliability
If HARQ-ACK feedback is enabled for all PDSCH transmissions, then service reliability is improved, but system efficiency deteriorates due to increased overhead
Solution Approach 1:
The patent segments the feedback requirement by service type and transmission characteristics, applying HARQ-ACK feedback only where necessary rather than universally. This segmentation allows the system to maintain high reliability for services that require it while avoiding unnecessary overhead for services that can tolerate lower reliability or have redundant transmission mechanisms.
Solution Approach 2:
The patent applies partial feedback action by enabling HARQ-ACK feedback only for specific PDSCH transmissions that require enhanced reliability, rather than for all transmissions. This partial application of feedback mechanism optimizes system efficiency by avoiding excessive feedback overhead while still providing reliability improvements where needed.
Data Source
AI summary
A HARQ-ACK feedback mode determining method, a HARQ-ACK feedback mode configuration method, and a device are disclosed. The method includes: determining, according to a service type corresponding to a PDSCH, a HARQ-ACK feedback mode corresponding to the PDSCH; determining, according to a radio network temporary identifier RNTI of a PDSCH, a HARQ-ACK feedback mode corresponding to the PDSCH; or determining, according to downlink control information DCI for scheduling a PDSCH, a HARQ-ACK feedback mode corresponding to the PDSCH.