User Equipment HARQ Grant Prioritization for De-Prioritized MAC PDUs
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies and unreliability due to the transmission of de-prioritized MAC PDUs stored in HARQ process buffers, particularly in scenarios involving conflicts between dynamic and configured grants and multiple configured grants.
Innovation Solution
A method for user equipment that prioritizes configured uplink grants based on logical channel priorities and autonomously manages HARQ processes to transmit de-prioritized MAC PDUs, including stopping configuredGrantTimers and delivering uplink grants to HARQ entities under specific conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If configured uplink grants are processed without priority-based differentiation, then resource utilization is maintained, but communication reliability deteriorates due to transmission of de-prioritized MAC PDUs
Solution Approach 1:
The patent segments configured uplink grants into prioritized and de-prioritized categories based on logical channel priority comparisons. This segmentation allows the system to selectively process grants, ensuring high-reliability transmission for prioritized grants while managing de-prioritized grants through HARQ retransmission mechanisms, thereby improving overall communication reliability without requiring complete reprocessing of all grants
Solution Approach 2:
The patent implements preliminary prioritization assessment of configured uplink grants before MAC PDU transmission. By evaluating logical channel priorities in advance and identifying de-prioritized grants beforehand, the system can prepare appropriate handling strategies (such as HARQ process selection and configuredGrantTimer management), preventing reliability issues before they occur
2Productivity
If all configured uplink grants are transmitted without prioritization, then resource utilization is maintained, but communication efficiency deteriorates due to unnecessary transmissions of low-priority data
Solution Approach 1:
The patent extracts de-prioritized MAC PDUs from the normal transmission flow by identifying configured uplink grants with lower logical channel priorities. These extracted de-prioritized grants are then handled through alternative mechanisms (HARQ process buffer management and configuredGrantTimer control), separating them from high-priority transmissions to improve overall communication efficiency and reduce unnecessary energy consumption
Solution Approach 2:
The patent changes the handling parameters for configured uplink grants based on their priority status. For de-prioritized grants, the system modifies the configuredGrantTimer behavior and HARQ process selection, allowing these grants to be deferred or retransmitted through different processes, thereby optimizing resource utilization and reducing energy waste from premature or low-value transmissions
3Speed
If de-prioritized MAC PDUs are immediately transmitted, then transmission speed is maintained, but system reliability deteriorates due to potential data loss in HARQ process buffers
Solution Approach 1:
The patent introduces HARQ process buffers as an intermediary layer between de-prioritized MAC PDU generation and transmission. Instead of immediately transmitting de-prioritized data, the system stores them in HARQ buffers with associated timers, allowing for potential retransmission opportunities and error correction, thereby maintaining reliability while managing transmission speed through controlled retrieval and retransmission
Data Source
AI summary
The present disclosure provides a method performed by user equipment, and user equipment. The method performed by user equipment includes: if a medium access control (MAC) entity is configured with a configured uplink grant and if the configured uplink grant is activated, then determining whether the MAC entity is configured to use the configured uplink grant to transmit a MAC PDU, namely a MAC protocol data unit, obtained for a de-prioritized configured uplink grant; and if the MAC entity is configured to use the configured uplink grant to transmit the MAC PDU, then delivering the configured uplink grant to a hybrid automatic repeat request (HARQ) entity. In this way, the problem involving transmission of a de-prioritized MAC PDU stored in a HARQ process buffer can be solved, thereby improving the communication efficiency and reliability of a wireless communication system.