Control and Data BWP Mapping for Low-Latency NR RedCap UEs
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Solution Overview
Problem
Existing wireless communication technologies, such as LTE and NR, face challenges in optimizing bandwidth part (BWP) mapping for control and data channels, particularly for devices with reduced capabilities like NR RedCap UEs, leading to potential latency and degraded performance due to limited bandwidth and processing capabilities.
Innovation Solution
Separate mapping of control and data BWPs, allowing for flexible subcarrier spacing configurations and extended tuning gaps, enabling efficient communication without overlapping or with partial overlap, and prioritizing active BWPs based on priority rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate mapping of control and data BWPs is implemented, then communication efficiency and reliability are improved, but device complexity increases
Solution Approach 1:
The patent divides the bandwidth part (BWP) mapping into separate control BWP and data BWP configurations. The control resource set (CORESET) is mapped to a control BWP with specific subcarrier spacing, while data channels are mapped to a data BWP with potentially different subcarrier spacing. This segmentation allows independent optimization of control and data transmission parameters, improving reliability by ensuring control signaling receives appropriate resources regardless of data channel requirements.
Solution Approach 2:
The patent introduces an additional dimension to BWP configuration by allowing different subcarrier spacing values for control and data BWPs simultaneously. Traditionally, a single BWP configuration applied to both control and data, but this invention adds the dimension of differentiated subcarrier spacing configuration, enabling control channels to use one subcarrier spacing while data channels use another, thereby resolving conflicts between control reliability and data efficiency requirements.
2Loss of time
If extended tuning gaps are allowed for BWP switching, then latency is reduced for capability-matched devices, but synchronization complexity increases
Solution Approach 1:
The patent implements dynamic BWP switching with extended tuning gaps that allow UEs to transition between BWPs with different subcarrier spacings. The tuning gap duration is dynamically adjusted based on the subcarrier spacing difference between source and target BWPs. This dynamic approach reduces switching latency by providing sufficient time for frequency tuning while maintaining flexibility to adapt to different switching scenarios, rather than using a fixed conservative gap value.
Solution Approach 2:
The patent performs preliminary configuration of multiple BWPs with different subcarrier spacing values before switching is needed. The UE is pre-configured with a set of available BWPs and their parameters, allowing rapid switching when needed. This preliminary preparation eliminates the need for complex real-time calculations during switching, reducing both latency and synchronization complexity by having switching parameters ready in advance.
3Productivity
If different subcarrier spacings are configured for control and data channels, then spectral efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent applies local quality by assigning different subcarrier spacing configurations to different functional areas (control vs. data) based on their specific requirements. Control channels may use a more robust subcarrier spacing for reliability, while data channels can use optimized subcarrier spacing for throughput. This localized optimization improves overall spectral efficiency by matching each channel type's characteristics to its functional requirements, rather than using a one-size-fits-all configuration.
Solution Approach 2:
The patent changes the subcarrier spacing parameter independently for control and data BWPs, allowing optimization of each channel type. The control BWP can be configured with a subcarrier spacing that provides better control signaling reliability, while the data BWP can use a subcarrier spacing optimized for data transmission efficiency. This parameter differentiation resolves the contradiction by allowing spectral efficiency improvement through tailored configurations while managing processing complexity through standardized independent configuration procedures.
4Productivity
If priority rules are implemented for overlapping BWPs, then resource allocation efficiency is improved, but control signaling overhead increases
Solution Approach 1:
The patent establishes priority rules for handling overlapping control and data BWPs in advance through higher-layer configuration. The network configures priority relationships between different BWPs before overlapping situations occur, so that when overlaps happen, the UE can automatically apply the predetermined priority rules without requiring additional real-time signaling. This preliminary configuration improves resource allocation efficiency by enabling automatic conflict resolution while minimizing signaling overhead by avoiding repeated priority negotiations.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may communicate on a physical control channel in a control bandwidth part (BWP) based at least in part on a mapping of the physical control channel to the control BWP, and communicate on a physical shared channel in a data BWP based at least in part on a mapping of the physical shared channel to the data BWP. Numerous other aspects are provided.