HARQ Process Segmentation for Non-Terrestrial Network Reliability
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Solution Overview
Problem
In wireless communication systems, especially in non-terrestrial networks with large propagation delays, disabling HARQ feedback can avoid stalls but may not meet the reliability requirements for certain messages, such as MAC CE and RRC messages.
Innovation Solution
The proposed solution involves enabling messages that require high reliability to be transmitted using appropriate HARQ processes. This is achieved by selectively using different HARQ process types, where important messages are transmitted with HARQ feedback and/or retransmission enabled, thereby avoiding stalls and ensuring sufficient reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ feedback is disabled to avoid stalls in non-terrestrial networks, then system productivity is improved, but message reliability deteriorates
Solution Approach 1:
The patent segments HARQ processes into multiple types (first type with feedback enabled, second type with feedback disabled) based on message priority and reliability requirements. Critical messages like RRC and MAC CE use first-type processes with HARQ feedback enabled, while less critical data uses second-type processes with feedback disabled, thus resolving the contradiction between reliability and productivity
Solution Approach 2:
Different HARQ feedback configurations are applied to different message types based on their specific reliability requirements. High-priority control messages receive enhanced reliability treatment through feedback-enabled processes, while bulk data transmission uses feedback-disabled processes for maximum throughput, achieving local optimization of both reliability and productivity
2Reliability
If HARQ feedback is enabled for all messages, then message reliability is improved, but system productivity deteriorates due to stalls
Solution Approach 1:
The patent divides HARQ processes into multiple types where only critical messages trigger feedback mechanisms. By segmenting the message flow into priority-based categories, the system maintains high reliability for essential control messages while avoiding productivity degradation from feedback-induced stalls in data transmission
Solution Approach 2:
The system dynamically changes the HARQ feedback parameter based on message type and priority. For RRC and MAC CE messages, feedback is enabled to ensure reliability, while for other data messages, feedback is disabled to maintain throughput, thus adapting system behavior to specific operational requirements
Data Source
AI summary
In a communication between a user equipment (UE) and a network node, the UE may receive a grant of uplink (UL) shared channel (SCH) resources from the network node. Each of the UL SCH resources may be associated with one of a plurality of hybrid automatic repeat request (HARQ) processes. Each HARQ process may be at least one of a plurality of HARQ process types, and each HARQ process type may be based on HARQ feedback status and HARQ retransmission status. The UE may transmit a control message on one or more UL SCH resources in response to the one or more UL SCH resources being determined to be usable based on the HARQ process type of the HARQ processes associated with the one or more of the UL SCH resources.