Partial RB Bundling and RBG Mapping in SBFD Slots
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Solution Overview
Problem
In wireless communications systems, user equipment (UE) faces challenges in determining the validity of partial resource block groups (RBGs) or bundles due to mixed transmission directions and guard-bands, leading to uncertainties in resource allocation and communication efficiency.
Innovation Solution
The UE employs techniques to determine the validity of partial RBGs or bundles by considering the transmission direction and guard-bands, interpreting resource indicator values (RIVs) relative to usable PRBs within the active bandwidth part (BWP), and adjusting resource allocations accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-interleaved RIV mapping is used in sub-band full-duplex slots with mixed transmission directions, then resource allocation flexibility is improved, but uncertainty in determining valid resource blocks increases
Solution Approach 1:
The patent segments the bandwidth part into multiple sub-bands, where each sub-band can be independently configured for specific transmission directions. This allows the system to apply different mapping rules to different sub-bands, resolving the conflict between allocation flexibility and determination accuracy by handling mixed-direction scenarios at the sub-band level rather than across the entire bandwidth.
Solution Approach 2:
The patent applies different RIV mapping characteristics to different sub-bands based on their transmission direction requirements. Downlink sub-bands use one mapping characteristic while uplink sub-bands use another, ensuring that each local region (sub-band) has the appropriate mapping properties for its specific function, thereby maintaining both flexibility and reliability.
2Productivity
If partial RBGs are included in resource allocation to increase resource utilization, then spectrum efficiency is improved, but communication reliability deteriorates due to direction mismatches
Solution Approach 1:
The patent performs preliminary determination of transmission direction for each sub-band before resource allocation. By pre-configuring which sub-bands are designated for downlink or uplink transmission, the system can proactively exclude sub-bands with direction mismatches from the resource allocation, preventing reliability issues before they occur while still maximizing utilization of compatible resources.
Solution Approach 2:
The patent converts the potential harm of direction mismatches in partial RBGs into a benefit by using the sub-band structure to identify and isolate problematic regions. Sub-bands with direction mismatches are systematically excluded from allocation, transforming what would be harmful partial RBG usage into a reliable resource selection process that maximizes effective spectrum utilization.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some cases, a user equipment (UE) may receive, via a sub-band full-duplex (SBFD) slot, a control message scheduling a first message associated with a first transmission direction, where the control message includes a resource indicator value indicating a starting virtual resource block group (RBG) and a set of contiguous virtual RBGs. Thus, the UE may map the set of contiguous virtual RBGs to a set of physical RBGs based on a determination of whether at least a portion of a first physical RBG is used for communication of the first message. In such cases, the determination may be based on the first physical RBG including one or more first physical resource blocks (PRBs) associated with the first transmission direction.