Configured Grant Time Allocation in NR-U for Multiple Access Opportunities
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Solution Overview
Problem
The existing Release 15 time-domain allocation for configured grant transmissions in NR-U systems is inefficient due to the limited single channel access opportunity during each periodicity, which does not align well with the LBT procedures in unlicensed spectrum, leading to suboptimal channel utilization.
Innovation Solution
Enhancements to the time-domain resource allocation by using bitmaps and multiple channel access opportunities within a periodicity, allowing flexible configuration of time-domain resources through RRC signaling, including the use of bitmaps, slot offsets, and cyclic shifts to improve channel utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single channel access opportunity is used during each periodicity, then system complexity is reduced, but channel utilization efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic time-domain resource allocation by configuring multiple channel access opportunities within each periodicity through RRC signaling. The system can dynamically select and activate specific opportunities based on traffic conditions and LBT outcomes, transforming the static single-opportunity approach into a flexible multi-opportunity framework that adapts to varying channel conditions without overwhelming system complexity
Solution Approach 2:
The patent segments the channel access process by dividing each periodicity into multiple distinct channel access opportunities, each with its own time-domain resource allocation. This segmentation allows the UE to attempt channel access at multiple points within a periodicity, improving the probability of successful transmission while maintaining manageable complexity through structured configuration
2Productivity
If multiple channel access opportunities are configured within a periodicity, then channel utilization efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple channel access opportunities and their associated time-domain resource allocations through RRC signaling before actual transmission. The UE receives and stores these configurations in advance, so when channel access is needed, it can quickly select from pre-prepared options rather than computing allocations in real-time, thus improving channel utilization while limiting the increase in device complexity
Solution Approach 2:
The patent creates a universal configuration framework where a single RRC configuration can define multiple channel access opportunities that serve different traffic conditions and LBT scenarios. This multi-functional configuration structure allows the same mechanism to handle various channel conditions and traffic patterns without requiring separate complex configurations for each case
3Adaptability or versatility
If flexible time-domain resource allocation is implemented, then adaptability to traffic demands is improved, but signaling overhead increases
Solution Approach 1:
The patent implements parameter changes by introducing configurable time-domain allocation parameters that can be adjusted through RRC signaling to match different traffic patterns. The system can modify parameters such as periodicity, offset, and resource allocation patterns to adapt to varying traffic demands, achieving high adaptability while managing signaling overhead through efficient parameter encoding and reuse
Data Source
AI summary
The present application relates to wireless devices and components including apparatus, systems, and methods for time-domain resource allocation for configured grant transmissions in New Radio (NR) systems operating on unlicensed spectrum. In some embodiments, a user equipment may be configured with periodicity, bitmap information, duration information, or slot-offset information to facilitate the time-domain resource allocation.