SBFD Frequency Resource Allocation for BWP-Subband Overlap
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Solution Overview
Problem
Conventional frequency resource allocation techniques in full-duplex networks face difficulties in identifying frequency domain resources during subband full-duplex (SBFD) slots due to overlaps between user equipment (UE) bandwidth parts (BWP) and subbands, leading to communication failures and increased interference.
Innovation Solution
The described techniques provide methods for a UE to identify starting resource blocks (RBs) within subbands of SBFD slots based on overlaps between BWPs and subbands, using separate or shared FDRA indications, and adjust RB sets to handle overlaps or disjointed subbands, enabling effective communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional frequency resource allocation techniques are used in full-duplex networks, then resource allocation can be performed using standard methods, but the UE cannot accurately identify frequency domain resources during SBFD slots due to overlaps between BWP and subbands, leading to communication failures and increased interference
Solution Approach 1:
The patent divides the frequency domain resource allocation into separate subband-level allocations. Instead of treating the entire bandwidth uniformly, the system segments resources into multiple subbands (e.g., first subband for uplink, second subband for downlink) and provides independent FDRA indications for each subband. This segmentation enables the UE to accurately identify which resource blocks are allocated in each subband, resolving the ambiguity caused by BWP-subband overlaps in full-duplex operation.
Solution Approach 2:
The patent applies local quality by providing differentiated frequency resource allocation indications for different subbands. Each subband receives tailored FDRA information appropriate to its specific characteristics and duplexing requirements. This allows the UE to apply different resource identification strategies for uplink versus downlink subbands, improving accuracy in identifying allocated resources while accounting for the local interference environment in each subband.
2Adaptability or versatility
If the BWP bandwidth differs from the subband bandwidth in SBFD slots, then the UE can be configured with flexible bandwidth parts, but the UE cannot determine the starting RB within the subband, leading to incorrect resource identification
Solution Approach 1:
The patent introduces an additional dimension of subband-level FDRA indication to complement the existing BWP-level allocation. By providing FDRA information at the subband level (a finer frequency granularity dimension), the system enables the UE to precisely determine starting resource blocks within each subband even when BWP bandwidth differs from subband bandwidth. This dimensional refinement resolves the precision problem without constraining BWP flexibility.
3Measurement precision
If separate FDRA indications are provided for each subband, then the UE can accurately identify frequency resources in each subband, but the signaling overhead increases
Solution Approach 1:
The patent applies partial action by providing separate FDRA indications only when necessary - specifically when subband-level resource allocation differs from BWP-level allocation. In cases where the allocation is uniform across subbands, the system can rely on the broader BWP-level FDRA indication, reducing signaling overhead. This selective application of detailed subband-level signaling maintains identification accuracy where needed while minimizing unnecessary overhead.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive an indication of a frequency domain resource allocation (FDRA) for communications associated with a subband full-duplex (SBFD) slot. The UE may identify, based at least in part on an overlap between a bandwidth part associated with the communications and a first subband of the SBFD slot, a starting resource block within the first subband of the SBFD slot of at least one resource block set associated with the FDRA, wherein the first subband of the SBFD slot has a different bandwidth than the bandwidth part. The UE may perform the communications during the SBFD slot in the first subband using the at least one resource block set.