HARQ Pool Prioritization for Overlapping Unlicensed Grants
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Solution Overview
Problem
Existing wireless communication systems face challenges in prioritizing logical channel transmissions and retransmissions efficiently when operating in unlicensed spectrum, particularly in scenarios involving overlapping configured grant configurations and HARQ processes.
Innovation Solution
The method involves selecting different HARQ processes for overlapping configured grants and prioritizing retransmissions over initial transmissions, especially when HARQ processes are shared, and applying logical channel-based prioritization to ensure high-priority data is transmitted efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple configured grant configurations are used for different traffic types, then the system can serve multiple logical channels with different priorities, but the complexity of prioritizing overlapping HARQ processes increases
Solution Approach 1:
The patent segments the HARQ process selection by assigning dedicated HARQ process pools to different configured grant configurations. Each configured grant configuration has its own set of HARQ processes, preventing overlaps and simplifying the prioritization logic while maintaining the ability to serve multiple logical channels with different priorities
Solution Approach 2:
The patent introduces a MAC layer prioritization mechanism as an intermediary that resolves conflicts between overlapping configured grants. This mediator evaluates logical channel priorities and selects the appropriate HARQ process based on pre-configured rules, reducing the complexity of direct HARQ process management
2Reliability
If retransmissions are prioritized over initial transmissions, then URLLC reliability is improved, but the capacity for lower priority services decreases
Solution Approach 1:
The patent segments HARQ processes into different pools associated with different configured grant configurations, allowing independent prioritization control. This enables URLLC traffic to prioritize retransmissions within its dedicated pool while eMBB traffic can utilize initial transmissions in its pool without interfering with URLLC capacity
Solution Approach 2:
The patent applies different quality characteristics to different HARQ process pools. Each pool can be configured with specific prioritization rules tailored to its associated logical channel type, allowing URLLC to have high reliability for retransmissions while eMBB maintains efficient capacity utilization for initial transmissions
3Productivity
If the same HARQ process is used for multiple configured grants, then resource utilization is improved, but transmission conflicts and data loss increase
Solution Approach 1:
The patent assigns dedicated HARQ process pools to each configured grant configuration, preventing process reuse across different grants. This segmentation eliminates transmission conflicts and data loss while maintaining efficient resource utilization through proper HARQ process management and selection
Data Source
AI summary
A wireless device is configured with a first configured grant associated with a first hybrid automatic repeat request (HARQ) pool and a second configured grant associated with a second HARQ pool. The first HARQ pool at least partially overlaps with the second HARQ pool, and the second configured grant partially overlaps with the first configured grant. For the first configured grant, the wireless device selects a first HARQ process from the first HARQ pool. For the second configured grant, the wireless device selects a second HARQ process from the second HARQ pool. The first HARQ process selected for the first configured grant is different than the second HARQ process selected for the second configured grant. The wireless device performs uplink transmission or retransmission for the first configured grant or the second configured grant.