Dynamic Sub-band Occupancy Detection for 5G NR-U Transmission Bursts
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Solution Overview
Problem
Current 5G NR-U systems are not designed to handle rapidly varying bandwidth changes, necessitating new methods to support variable-bandwidth transmission bursts in unlicensed spectrum.
Innovation Solution
User equipment (UE) devices are configured with channel usage information, including N bitmaps and reference signal information, to determine occupied sub-bands and adjust communication resources dynamically, allowing for in-sync and out-of-sync evaluations based on sub-band occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system uses fixed bandwidth allocation in current 5G NR framework, then device complexity is reduced and ease of operation is improved, but adaptability to rapidly varying channel conditions deteriorates and bandwidth utilization efficiency decreases
Solution Approach 1:
The patent implements dynamic bandwidth allocation where the UE determines sub-band occupancy and adapts communication resources based on actual channel conditions. The system transitions from fixed bandwidth to variable bandwidth by allowing different subsets of sub-bands to be occupied during different DL transmission bursts, enabling the system to dynamically adjust to channel availability while maintaining manageable complexity through standardized procedures.
Solution Approach 2:
The patent changes the bandwidth parameter from fixed to variable by introducing sub-band occupancy determination. The UE monitors which sub-bands are occupied and adjusts communication resources accordingly, allowing the system to adapt bandwidth usage to actual channel conditions without requiring complete redesign of the communication framework.
2Productivity
If the system implements variable-bandwidth transmission bursts with per-sub-band CCA, then bandwidth utilization efficiency is improved and adaptability is enhanced, but device complexity increases and measurement precision requirements increase
Solution Approach 1:
The patent segments the bandwidth into multiple sub-bands and performs Clear Channel Assessment (CCA) independently for each sub-band. This allows the system to identify and utilize available sub-bands while excluding occupied ones, improving bandwidth utilization efficiency. The segmentation approach enables granular control over resource allocation without requiring complete reconfiguration of the entire bandwidth.
Solution Approach 2:
The patent implements feedback mechanisms where the UE determines sub-band occupancy based on CCA outcomes and adjusts communication resources accordingly. The system continuously monitors channel conditions and adapts resource allocation based on feedback from occupancy determination, enabling efficient bandwidth utilization through closed-loop control.
3Reliability
If the UE performs comprehensive sub-band occupancy determination and resource adjustment, then communication reliability is improved and bandwidth utilization is enhanced, but measurement precision requirements and processing complexity increase
Solution Approach 1:
The patent replaces complex mechanical resource allocation mechanisms with signal-based occupancy determination. The UE uses reference signals and control channel information to detect sub-band occupancy, substituting direct measurement with signal processing approaches that improve reliability while reducing the burden on measurement precision requirements.
Data Source
AI summary
Methods and apparatus for supporting transmission bursts in unlicensed spectrum are described. Different sets of sub-bands within a downlink bandwidth portion of unlicensed spectrum can be, and sometimes are, occupied during different DL transmission bursts depending on channel availability. A user device is configured with channel usage information, e.g. N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE, and/or reference signal information. The UE determines the occupied sub-bands in a DL transmission burst over the bandwidth portion, and determines control channel resource information based on the determined occupied sub-channels. The UE determines CSI-RS measurement locations based on determined sub-band occupancy. In some embodiments, the UE performs in-sync and out-of-sync evaluations based BLER threshold scaling factors, which are based on sub-band occupancy.