Narrowband Frequency Hopping for eRedCap Uplink and Downlink
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Solution Overview
Problem
eRedCap UEs experience reduced transmission and reception performance due to decreased bandwidth, leading to poor frequency diversity and traffic congestion issues, especially in scenarios requiring massive connections.
Innovation Solution
Implement frequency hopping based on a plurality of narrowbands within the frequency band, deploying resource blocks at specific locations such as between contiguous narrowbands, edges, and the center of the frequency band, with configuration information provided via RRC signaling, DCI, or MAC CE to optimize frequency hopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If bandwidth is reduced for eRedCap UE, then device complexity and power consumption are reduced, but frequency diversity performance deteriorates
Solution Approach 1:
The frequency band is divided into multiple narrowbands, and the UE performs frequency hopping across these narrowbands. This segmentation allows the UE to access multiple frequency resources despite having limited bandwidth capability, thereby improving frequency diversity performance without increasing UE complexity
Solution Approach 2:
The patent introduces frequency hopping in the frequency domain as an additional dimension for resource access. By hopping across different narrowbands in the frequency domain, the UE can achieve frequency diversity gains that would otherwise require larger bandwidth, effectively compensating for the reduced bandwidth limitation
2Use of energy by moving object
If bandwidth is reduced for eRedCap UE, then power consumption is reduced, but transmission performance deteriorates
Solution Approach 1:
The frequency band is segmented into multiple narrowbands, allowing the UE to hop across different frequency segments. This enables the UE to achieve better transmission performance through frequency diversity while maintaining low power consumption by operating within its reduced bandwidth capabilities
Solution Approach 2:
The patent changes the frequency parameter by hopping across different narrowbands. This dynamic frequency parameter change allows the UE to avoid poor channel conditions and achieve better transmission performance without increasing power consumption
3Adaptability or versatility
If massive connections are supported through narrow bandwidth, then device connectivity is improved, but traffic congestion occurs
Solution Approach 1:
The frequency band is divided into multiple narrowbands that can be allocated to different UEs. This segmentation allows massive connections to be supported while distributing traffic across multiple frequency resources, thereby avoiding traffic congestion in any single narrowband
Solution Approach 2:
The patent implements dynamic frequency hopping where UEs can switch between different narrowbands. This dynamic resource allocation allows the system to adapt to traffic conditions and distribute load effectively, supporting massive connections without causing traffic congestion
Data Source
AI summary
A method performed by a user equipment in a wireless communication system according to an embodiment of the present disclosure comprises receiving configuration information related to a frequency band from a base station, and, based on a frequency hopping related to the frequency band, transmitting an uplink signal to the base station or receiving a downlink signal from the base station. The frequency hopping is performed based on a plurality of narrowbands included in the frequency band. One or more resource blocks (RBs) that do not belong to the plurality of narrowbands within the frequency band are deployed based on at least one of i) between contiguous narrowbands, ii) both edges of the frequency band, and/or iii) a center of the frequency band.