Dynamic gNB Authorization of Sidelink in Downlink Slots
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Solution Overview
Problem
In New Radio (NR) Release-17/Release-18, sidelink (SL) transmissions are restricted to uplink (UL) slots, limiting resource availability and increasing latency for SL-based applications like vehicle-to-vehicle communication, which require low latency and high throughput.
Innovation Solution
Allowing SL transmissions in downlink (DL) slots while implementing mechanisms to manage interference with DL transmissions, including preemption techniques and enhanced collision handling procedures to ensure minimal disruption to DL communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SL transmissions are restricted to UL slots, then DL transmission integrity is protected, but SL resource availability and throughput are limited
Solution Approach 1:
The patent dynamically determines whether to allow SL transmissions in DL slots based on real-time conditions. The gNB evaluates factors such as SL traffic requirements, DL channel conditions, and interference levels to make adaptive decisions about permitting SL transmissions in otherwise DL-only slots, thereby optimizing both DL reliability and SL resource availability
Solution Approach 2:
The patent changes the parameter of slot type designation from static to dynamic. By introducing a mechanism where DL slots can be temporarily reconfigured to allow SL transmissions based on traffic demand and interference conditions, the system transforms rigid slot allocation into flexible resource management that balances DL integrity protection with SL resource availability
2Productivity
If SL transmissions are allowed in DL slots, then SL resource availability and throughput improve, but interference with DL transmissions increases
Solution Approach 1:
The gNB acts as an intermediary that coordinates between SL and DL transmissions. It receives SL transmission requests, evaluates potential interference with DL communications, and makes authorization decisions. The gNB also monitors channel conditions and can dynamically adjust or cancel SL transmissions to protect DL communications, thereby mediating the conflict between SL resource availability and DL interference protection
Solution Approach 2:
The patent implements preliminary interference assessment before allowing SL transmissions in DL slots. The gNB evaluates potential interference impacts, checks DL channel conditions, and pre-authorizes or rejects SL transmissions based on predicted interference levels. This preliminary anti-action prevents harmful interference before it occurs, enabling SL resource expansion while protecting DL communications
3Loss of time
If SL transmissions are allowed in DL slots, then latency is reduced, but measurement accuracy and channel estimation reliability deteriorate
Solution Approach 1:
The patent performs preliminary channel measurements and interference assessments before authorizing SL transmissions in DL slots. The gNB evaluates channel conditions, identifies suitable time-frequency resources for SL transmissions that minimize interference with channel measurements, and pre-configures transmission parameters. This preliminary action enables low-latency SL communications while preserving measurement accuracy by avoiding conflicts with critical channel estimation activities
Data Source
AI summary
A method and device are provided in which the device designates a downlink (DL) slot of an uplink (UL)-DL slot configuration period for sidelink (SL) transmission. The device receives, from a gNode B (gNB), an indication of a permission status of the SL transmission. The device updates the permission status of the SL transmission based on the indication.