HARQ Feedback Scheduling for Alternating TBs in Weak Coverage
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Solution Overview
Problem
In machine type communication (MTC), the high failure rate of Hybrid Automatic Repeat reQuest (HARQ) transmissions occurs due to abnormalities during alternate transmission scheduling of transmission blocks (TBs), particularly in devices with weak signal coverage and low processing capacity.
Innovation Solution
The method involves transmitting HARQs of different TBs based on different time domain resources, with cyclically alternating TB transmission units until a configured number of repetitions is met, reducing overlap and processing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If HARQs of multiple TBs are transmitted using conventional alternate transmission scheduling, then transmission coverage is extended, but transmission failure rate increases due to abnormalities in devices with weak signal coverage
Solution Approach 1:
The patent segments the transmission process by dividing HARQ transmissions into distinct time domain resources. Instead of overlapping alternate transmissions, each HARQ is assigned a specific time slot, separating the transmission events that previously occurred simultaneously or overlappingly. This segmentation eliminates the abnormalities caused by concurrent transmissions in weak signal conditions.
Solution Approach 2:
The patent transitions from a time-overlapping transmission model to a time-sequential model by introducing explicit time domain resource allocation. HARQs are transmitted in different time slots rather than overlapping in time, effectively moving the transmission strategy into the time dimension to resolve conflicts that arose in the frequency and code domains.
2Reliability
If multiple TBs are transmitted with repeated transmissions, then transmission reliability is improved, but processing complexity increases for devices with limited capacity
Solution Approach 1:
The patent segments the processing workload by assigning different time domain resources to different HARQ transmissions. Devices with limited processing capacity only need to handle one HARQ at a time in their allocated time slot, rather than simultaneously processing multiple overlapping HARQs. This segmentation reduces the peak processing complexity while maintaining repeated transmission reliability.
3Reliability
If HARQs are transmitted with frequent repetitions, then transmission success rate improves, but time domain overlap increases causing interference
Solution Approach 1:
The patent resolves time domain overlap by allocating distinct time slots to different HARQ transmissions. Instead of having repetitions overlap in time, each HARQ occupies a separate time resource. This dimensional separation in the time domain eliminates interference between repeated transmissions while preserving the reliability benefits of repetition.
Data Source
AI summary
A method and apparatus for transmitting HARQ feedback, and a storage medium are described. The method includes, for a plurality of different transmission blocks (TBs) that are alternately transmitted, using different time domain resources to transmit HARQ feedback of the different TBs, wherein alternately transmitting the plurality of different TBs comprises: cyclically transmitting TB alternate transmission units until the total number of repeated transmissions configured for each of the TBs is met, wherein the TB alternate transmission units comprise N repeated transmissions of the different TBs, and N is greater than zero and less than the configured total number of repeated transmissions.