BWP Subband Frequency Hopping for Reduced-Capability UEs
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Solution Overview
Problem
Devices with reduced capability, such as reduced capability or enhanced reduced capability user equipment (UE), configured with a reduced baseband bandwidth within a system bandwidth part (BWP, do not support frequency hopping across BWPs, which reduces frequency diversity, throughput, and reliability of communications.
Innovation Solution
A first network node configures a frequency hopping pattern for a second network node to switch between subbands within a system BWP, improving frequency diversity, throughput, and reliability by indicating an order of subband hopping, time duration, and periodicity through control messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If devices with reduced capability use reduced baseband bandwidth within a BWP, then device complexity is reduced, but frequency diversity is lost
Solution Approach 1:
The BWP is segmented into multiple subbands, and the reduced capability device hops between different subbands over time. This segmentation allows the device to maintain reduced bandwidth complexity while still accessing multiple frequency regions through time-based subband switching, thereby preserving frequency diversity.
Solution Approach 2:
The device dynamically switches between different subbands within the BWP according to a frequency hopping pattern. This dynamic subband switching enables the device to access different frequency regions at different times, maintaining frequency diversity despite having reduced baseband bandwidth capability.
2Device complexity
If frequency hopping across BWPs is not supported, then device complexity is reduced, but throughput is reduced
Solution Approach 1:
The BWP is divided into multiple subbands that the device can hop between. This segmentation provides multiple frequency paths for data transmission, increasing throughput opportunities without requiring the device to support full BWP bandwidth simultaneously, thus maintaining reduced complexity.
Solution Approach 2:
The device follows a periodic frequency hopping pattern across subbands within the BWP. This periodic subband switching creates multiple transmission opportunities across different frequency regions, enhancing throughput without requiring complex simultaneous multi-band support.
3Device complexity
If frequency hopping across BWPs is not supported, then device complexity is reduced, but communication reliability is reduced
Solution Approach 1:
The BWP is segmented into multiple subbands, providing diverse frequency paths for communication. By hopping between these segmented subbands, the device achieves frequency diversity that improves communication reliability without requiring support for the entire BWP bandwidth simultaneously.
Solution Approach 2:
The device dynamically switches between subbands within the BWP to adapt to varying channel conditions. This dynamic subband selection provides frequency diversity gain, improving communication reliability while maintaining reduced device complexity through limited instantaneous bandwidth support.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. Some wireless communications systems may support frequency hopping across subbands within a configured bandwidth part (BWP). A first network node may transmit a first control message to a second network node to indicate a set of one or more frequency hopping patterns for switching between two or more subbands within the BWP configured for the second network node. The first network node may, in some aspects, transmit a second control message that is indicative of a designated frequency hopping pattern from among the set of one or more frequency hopping patterns indicated via the first control message. The first and second network nodes may communication via a first subband and a second subband of the two or more subbands in accordance with the default or designated frequency hopping pattern.