Autonomous Uplink Waveform Modification for Shared Spectrum
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently coordinating autonomous uplink transmissions in shared or unlicensed radio frequency spectrum, leading to potential collisions and inefficiencies due to unscheduled wireless systems coexisting with scheduled systems, particularly in scenarios involving hidden nodes and unclear channel occupancy.
Innovation Solution
Implementing listen-before-talk (LBT) procedures and waveform modifications for user equipment (UE) to manage autonomous uplink transmissions, allowing UEs to contend for channel access and provide channel resource indications to base stations, along with dynamic activation/deactivation of AUL transmissions based on DCI signaling for efficient resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If autonomous uplink transmissions are implemented in shared radio frequency spectrum, then system throughput and efficiency are improved, but collisions and interference increase due to unscheduled transmissions coexisting with scheduled systems
Solution Approach 1:
The base station performs preliminary actions by determining available channel resources and signaling this information to the UE before autonomous uplink transmissions occur. This advance preparation allows the UE to select appropriate resources without causing collisions, resolving the contradiction between enabling autonomous transmissions (for throughput) and preventing collisions (for reliability).
Solution Approach 2:
The system implements feedback mechanisms where the base station signals available channel resources to the UE, and the UE provides channel resource indications back to the base station. This closed-loop feedback enables coordinated autonomous uplink transmissions that maintain high throughput while ensuring transmission reliability through proper resource selection.
2Ease of operation
If UEs autonomously contend for channel access in shared spectrum, then fair channel access is achieved, but base station awareness of transmission timings is lost
Solution Approach 1:
The UE provides feedback to the base station by indicating available channel resources and transmission timings. This feedback mechanism maintains base station awareness of when autonomous transmissions will occur, preserving scheduling information while still allowing UEs to autonomously contend for channel access in a fair manner.
Solution Approach 2:
The system uses an intermediary signaling mechanism where the UE communicates channel resource information to the base station. This intermediary information exchange acts as a bridge between autonomous UE transmissions and base station scheduling knowledge, allowing the base station to remain informed without directly controlling every transmission.
3Productivity
If listen-before-talk procedures are implemented for autonomous uplink transmissions, then channel access efficiency is improved, but device complexity increases
Solution Approach 1:
The base station performs preliminary determination of available channel resources and signals this information to the UE before autonomous transmissions. This preliminary action reduces the complexity of LBT procedures at the UE by providing advance channel information, while still maintaining efficient channel access through coordinated resource selection.
Data Source
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AI summary
Techniques for autonomous uplink (AUL) transmissions are provided that allow for efficient use of shared radio frequency spectrum band resources. A user equipment (UE) may determine a duration of an AUL transmission and modify an uplink waveform or provide an indication to a base station of one or more channel resources that may be available for base station transmissions, in order to more fully utilize shared radio frequency spectrum band resources within a maximum channel occupancy time (MCOT). A base station may activate or deactivate AUL transmissions through downlink control information (DCI) transmitted to the UE. A UE and base station may exchange various other control information to provide relatively efficient autonomous uplink transmissions and use of the shared radio frequency spectrum band resources.