NR-U Slot Format Indicator Segmentation for Lower Access Latency
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies and increased latency due to the need for medium-sensing procedures when multiple network operating entities contend for access to shared unlicensed spectrum, leading to potential interference and communication bottlenecks.
Innovation Solution
Implement a method for coordinated resource partitioning using a slot format indicator (SFI) that separates channel occupancy time (COT) range indication from SFI, employing a three-segment structure to enhance communication efficiency and reduce interference by prioritizing network operators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If medium-sensing procedures are implemented when multiple network operating entities contend for access to shared unlicensed spectrum, then interference between entities is reduced, but communication latency increases and system efficiency decreases
Solution Approach 1:
The COT is divided into multiple segments with different priority levels (first priority, second priority, third priority segments). This segmentation allows different network operating entities to access resources in an organized manner, reducing contention and medium-sensing procedures while maintaining interference control through structured priority-based access.
Solution Approach 2:
The patent establishes COT structure and priority allocations in advance through signaling between network operating entities. By pre-defining which entities have access to which priority segments during which time periods, the system eliminates the need for real-time medium-sensing procedures, thereby reducing latency while maintaining interference control.
2Productivity
If coordinated resource partitioning with priority segments is implemented, then system efficiency and resource utilization improve, but signaling overhead increases
Solution Approach 1:
The COT structure and priority allocation framework serves multiple functions simultaneously: it defines resource partitioning, establishes access priorities, coordinates between different network operating entities, and enables efficient spectrum utilization. This multi-functionality reduces the need for separate signaling mechanisms, thereby improving system efficiency while limiting the increase in signaling overhead.
3Reliability
If COT structure is established in advance through signaling, then medium access coordination improves and interference is reduced, but flexibility in dynamic spectrum conditions decreases
Solution Approach 1:
The patent implements a dynamic COT structure where the network operating entity with the lowest priority can request extensions to its COT when spectrum conditions permit. This dynamic adjustment mechanism allows the system to maintain pre-established coordination for reliability while adapting to changing spectrum conditions, thereby balancing both requirements.
Data Source
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AI summary
Enhancements to slot format indicator (SFI) for new radio (NR) unlicensed (NR-U) operations is disclosed. The SFI may be transmitted separately from a channel occupancy time (COT) range indication. The COT range indication identifies parameters of a three-segment structure of a current COT within the current TxOP. Upon receiving the SFI and COT range indication, a UE may engage in communications with the serving UE in accordance with the COT range indication and the SFI.