Dynamic HARQ RTT Timer Adjustment for Multi-TB Scheduling
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Solution Overview
Problem
Current wireless communication systems face challenges when scheduling multiple Transmission Blocks (TBs) with a single Downlink Control Indication (DCI), leading to inadequate HARQ RTT timer values, which can result in premature timer expiration and unnecessary power consumption.
Innovation Solution
The method involves dynamically generating an acknowledgement timer value based on the quantity of transmission blocks scheduled in a DCI, using formulas such as 7+l*N or 7+l*N+s, where N is the Physical Uplink Control Channel repetition factor, l is the quantity of TBs, and s is a delay factor for machine type communication operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed HARQ RTT timer value is used for multiple TB scheduling, then the system complexity is reduced, but the timer may expire prematurely causing retransmission failures
Solution Approach 1:
The HARQ RTT timer value is made dynamic by adjusting it according to the number of TBs scheduled in the DCI. The timer value is calculated as a function of the TB quantity, allowing the timer to adapt to different scheduling scenarios and prevent premature expiration while maintaining manageable system complexity through a standardized adjustment formula.
Solution Approach 2:
The timer parameter is changed based on the number of TBs. When multiple TBs are scheduled, the HARQ RTT timer value is increased proportionally to ensure all acknowledgments can be transmitted within the timer period, resolving the contradiction between fixed complexity and variable reliability requirements.
2Reliability
If the HARQ RTT timer value is increased to accommodate multiple TBs, then the reliability of ACK transmission is improved, but the power consumption increases due to extended monitoring
Solution Approach 1:
The HARQ RTT timer value is dynamically adjusted based on the actual number of TBs scheduled. This prevents unnecessary extension of the timer and associated power consumption when fewer TBs are scheduled, while ensuring adequate timer duration when more TBs require acknowledgment, thus optimizing the balance between reliability and energy efficiency.
Data Source
AI summary
Methods of operating a wireless device in a communication network are provided. Such methods include receiving a scheduling message that includes a schedule identifying a plurality of transmission blocks, TBs and determining a quantity of the plurality of TBs that are identified in the scheduling message. Methods may include determining a quantity of Hybrid Automatic Repeat Request Acknowledgement, HARQ ACKs in an ACK bundle identified in the scheduling message and dynamically generating an acknowledgement timer value that corresponds to the quantity of the plurality of TBs and the quantity of HARQ ACKs in the ACK bundle.