Non-Contiguous Resource Blocks Signaling for Subband Full-Duplex
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Solution Overview
Problem
Existing wireless communications systems lack a signaling mechanism to inform user equipment (UE) about resource blocks for full-duplex communications, limiting the implementation of subband full-duplex (SBFD) modes that could enhance system capacity, data rates, and reduce latency.
Innovation Solution
Implement control signaling to configure non-contiguous resource blocks (RBs) for bandwidth parts (BWP), indicating RBs in each BWP through arrays, subband indications, beginning RB indices, and bitmaps, and allow switching between SBFD and half-duplex modes via time domain patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional contiguous resource block allocation is used, then system simplicity is maintained, but full-duplex communication capability and system capacity are limited
Solution Approach 1:
The patent divides the bandwidth part into multiple subbands and allocates different subbands for uplink and downlink communications simultaneously. This segmentation enables full-duplex operation by separating frequency resources into non-contiguous resource blocks, allowing simultaneous bidirectional communication without requiring a complete new signaling framework
Solution Approach 2:
The patent extends existing bandwidth part configuration mechanisms to support both half-duplex and full-duplex modes. The same BWP configuration framework can indicate either contiguous or non-contiguous resource blocks depending on the duplex mode, making the signaling mechanism universal and adaptable to different communication scenarios without requiring entirely separate signaling paths
2Productivity
If non-contiguous resource blocks are configured for SBFD mode, then system capacity and data rates are enhanced, but control signaling complexity increases
Solution Approach 1:
The patent introduces frequency domain granularity into the resource allocation by indicating specific subbands within a bandwidth part. Instead of allocating the entire BWP contiguously, the system now operates in the subband dimension, allowing selective activation of non-contiguous resource blocks for uplink and downlink, thereby enhancing capacity while managing signaling through structured subband indicators
Solution Approach 2:
Different subbands within the same bandwidth part are assigned different communication directions (uplink or downlink) based on local quality requirements. This allows the system to optimize resource allocation locally in the frequency domain, assigning resources with better uplink conditions to uplink subbands and vice versa, thereby improving overall system capacity through localized optimization
3Loss of time
If subband full-duplex mode is implemented, then latency is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent enables continuous simultaneous uplink and downlink transmissions within the same time slot by allocating non-contiguous resource blocks. This eliminates the need for time-division switching between directions, maintaining continuous useful action in both directions simultaneously and thereby reducing latency without requiring complex dynamic resource allocation during transmission
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Example wireless communications systems may implement control signaling configuring a user equipment (UE) to communicate in a subband full-duplex (SBFD) mode. An SBFD mode may include a non-contiguous bandwidth part (BWP), and control signaling may indicate the resource blocks (RB)s included in the non-contiguous BWP. In some cases, the non-contiguous BWP may be for communications between the UE and the network in one communications direction (e.g., uplink or downlink), and another BWP may be configured for communications between the UE and the network in the other communications direction. The non-contiguous BWP may include two subbands, and the other BWP may be non-overlapping with (e.g., positioned between) the two subbands in the frequency domain. The network may configure a BWP time domain switching pattern (e.g., switching between SBFD and half-duplex modes according to a BWP time domain switching pattern).