Grant-Free Uplink Retransmission With Priority-Based Backoff
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing grant-free uplink transmissions, particularly in determining appropriate backoff values and redundancy versions for successful data transmission and retransmission.
Innovation Solution
A wireless transmit/receive unit (WTRU) employs grant-free transmissions with differentiated priorities for parts of a transport block, using separate backoff value ranges for initial and retransmission attempts, and multiplexing with varying redundancy versions to enhance transmission success.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single backoff value range is used for both initial transmission and retransmission, then the system operation is simple, but the transmission reliability is reduced
Solution Approach 1:
The patent segments the backoff value selection into two distinct ranges: a first backoff value range for initial transmissions and a second backoff value range for retransmissions. This segmentation allows the system to optimize backoff behavior for different transmission stages, improving overall transmission reliability while maintaining manageable complexity through clear differentiation between initial and retransmission protocols.
2Productivity
If all parts of transport block use the same redundancy version, then the system operation is simple, but the transmission efficiency is reduced
Solution Approach 1:
The patent applies local quality by assigning different redundancy versions to different parts of the transport block based on their priority levels. High-priority parts use one redundancy version while low-priority parts use another, allowing optimized error protection tailored to each part's importance. This improves transmission efficiency by allocating redundancy resources more effectively while managing complexity through systematic differentiation.
3Reliability
If grant-free resources are transmitted without prioritization, then the system operation is simple, but the data delivery reliability is reduced
Solution Approach 1:
The patent segments the transport block into multiple parts with different priority levels (high-priority and low-priority parts). This segmentation enables differentiated handling of data segments, ensuring that critical high-priority data receives appropriate resources and protection, thereby improving data delivery reliability while maintaining manageable complexity through clear priority-based categorization.
Data Source
AI summary
A wireless transmit receive unit (WTRU) may send a grant free transmission comprising a first and a second part, each of which may be associated with a priority. The first part's priority may be higher than the second part's priority. The WTRU may select a first back of value from a first range of back off values. The WTRU may determine whether the grant free transmission was successful. If the grant free transmission was not successful, the WTRU may send a retransmission of the grant free transmission, which may include the first part and may not include the second part. The retransmission may select a second back off value from a second range of back off values, which may be a larger than the first range of back off values. The second back off value may indicate the number of grant free resource to skip prior to sending the retransmission.