Enhanced UE Assistance Information for Bandwidth Part Selection
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR networks, face challenges in efficiently facilitating bandwidth part (BWP) selection during handovers, which affects power conservation and coverage, especially for devices with reduced capabilities like RedCap UEs.
Innovation Solution
The implementation of enhanced UE assistance information (UAI) transmission, which includes preferred BWP indications, modulation and coding schemes, and RACH configurations, is used to optimize BWP selection and resource allocation during handovers, allowing for better power management and coverage enhancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If enhanced UAI transmission with preferred BWP indications is implemented during handover, then power savings and coverage are improved, but signaling overhead increases
Solution Approach 1:
The UE transmits the enhanced UAI message containing preferred BWP indications before the handover is completed, allowing the target gNB to pre-configure the appropriate BWP. This preliminary action enables faster handover execution and reduces the time the UE needs to operate at higher power levels, thereby improving power savings while the structured format of the enhancement minimizes additional signaling overhead.
2Adaptability or versatility
If multiple BWP configurations are supported for different data types, then adaptability and resource optimization are improved, but device complexity increases
Solution Approach 1:
The BWP configurations are segmented into different types based on data characteristics - wideband BWPs for uplink data transmission and narrowband BWPs for coverage enhancement. The enhanced UAI message structure separates preferred BWP indications by data type, allowing the UE to independently select and manage different BWPs for different traffic types without requiring complex unified configuration management, thus improving adaptability while controlling device complexity.
Data Source
AI summary
Wireless devices are configured to facilitate UE assisted bandwidth part (BWP) selection in wireless communication systems. According to one example, a scheduled entity can receive an RRC reconfiguration message indicating a handover from a source cell to a target cell, identify uplink data in the buffer, and send an enhanced UE assistance information (UAI) transmission to the target cell, the enhanced UAI indicating a preferred BWP of the target cell. In addition, a scheduling entity can receive an enhanced UAI transmission from a scheduled entity indicating a preferred BWP for the scheduled entity, and select the preferred BWP for communication with the scheduled entity from the enhanced UAI. Other aspects, examples, and features are also included.