Bandwidth Part Subband Hopping for Fading Robustness
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Solution Overview
Problem
Current mobile communication networks face challenges in efficiently managing and optimizing communication protocols across a diverse range of wireless devices and base stations supporting multiple technologies, leading to suboptimal performance and resource allocation.
Innovation Solution
The implementation of advanced New Radio (NR) user plane and control plane protocol stacks, along with bandwidth part configurations and carrier aggregation techniques, enables flexible and adaptive communication protocols that cater to varying device capabilities and network conditions, optimizing resource allocation and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bandwidth parts with subband hopping are implemented, then frequency diversity and robustness against frequency-selective fading are improved, but device complexity and processing overhead increase
Solution Approach 1:
The bandwidth part is segmented into multiple subbands, and the transmission frequency hops between these subbands across different slots. This segmentation allows the system to achieve frequency diversity by distributing transmissions across multiple frequency segments, thereby improving robustness against frequency-selective fading while managing complexity through structured subband organization
Solution Approach 2:
The frequency allocation is made dynamic through subband hopping, where the transmitted subband changes according to a hopping pattern across different slots. This dynamic frequency switching enables the system to adapt to varying channel conditions and achieve frequency diversity, balancing reliability improvement with controlled processing overhead through predictable hopping patterns
2Reliability
If non-contiguous resource blocks are allocated, then frequency diversity is improved, but scheduling complexity and resource management overhead increase
Solution Approach 1:
Different resource block allocation patterns are applied to different subbands within the bandwidth part. Each subband can have its own contiguous or non-contiguous resource block structure optimized for local channel conditions, achieving frequency diversity while managing scheduling complexity through localized rather than global resource management
Solution Approach 2:
The network pre-configures the UE with multiple resource block allocation patterns and a hopping pattern before actual data transmission. This preliminary configuration allows the UE to autonomously determine resource block allocations based on the pre-defined patterns, reducing real-time scheduling complexity while maintaining frequency diversity through non-contiguous resource block usage
Data Source
AI summary
A wireless device may receive one or more messages comprising configuration parameters of a bandwidth part (BWP) of a cell, indicating a subcarrier spacing of the BWP and a hopping pattern indicating frequency regions of the cell across time slots. In an embodiment, the frequency regions may be based on the subcarrier spacing of the BWP. The wireless device may further determine, during a time slot, frequency resources of the BWP based on a frequency region indicated in the hopping pattern. The wireless device may communicate with a base station, during the time slot, using resource blocks of the frequency resources.