UL BWP Switching for RAR Grant Frequency Allocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink bandwidth parts (BWPs) and frequency resource allocation in fifth-generation cellular systems, particularly in scenarios requiring high-speed, low-latency, and reliable communication.
Innovation Solution
A terminal apparatus and base station apparatus are designed to dynamically manage initial and additional UL BWPs through RRC messages, utilizing RAR UL grants for efficient PUSCH scheduling, with truncation or bit insertion decisions based on initial UL BWP bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an additional UL BWP is configured to support wider bandwidth transmission, then the transmission capacity and data rate are improved, but the complexity of BWP management and frequency resource allocation increases
Solution Approach 1:
The uplink bandwidth is divided into multiple BWPs (initial UL BWP and additional UL BWP), allowing the system to manage different bandwidth segments separately. This segmentation enables efficient resource allocation by activating only the necessary BWP(s) based on traffic requirements, thus improving transmission capacity without requiring the terminal to permanently manage the entire wide bandwidth.
Solution Approach 2:
The system dynamically switches between different BWP configurations based on current transmission needs. The terminal can activate or deactivate the additional UL BWP as required, allowing flexible adaptation to varying data rate requirements while maintaining manageable complexity by only processing active BWPs.
2Ease of operation
If the RAR UL grant uses a fixed-size first field for frequency resource allocation, then the processing simplicity is improved, but the allocation flexibility and precision are reduced
Solution Approach 1:
The system changes the interpretation of the first field in the RAR UL grant based on the activated BWP. When the initial UL BWP is active, the first field is truncated to indicate frequency resources within that BWP. When the additional UL BWP is active, a bit is inserted to expand the field's range to cover the additional BWP's frequency resources. This parameter change approach maintains processing simplicity while adapting to different BWP configurations.
3Adaptability or versatility
If the system supports both initial UL BWP and additional UL BWP configurations, then the adaptability to different transmission scenarios is improved, but the difficulty of detecting and measuring frequency resources increases
Solution Approach 1:
The system applies different processing rules to the first field in the RAR UL grant depending on which BWP is active. The truncation or bit insertion is determined locally based on the BWP configuration state, allowing the terminal to correctly interpret frequency resource allocations for the currently active BWP without confusion from other BWP configurations.
Data Source
AI summary
A terminal apparatus that communicates with a base station apparatus includes: a reception unit configured to receive a configuration of an initial uplink (UL) bandwidth part (BWP) and a configuration of an additional UL BWP via a radio resource control (RRC) message and receive a random access response (RAR) message including an RAR UL grant; and a transmission unit configured to transmit a physical uplink shared channel (PUSCH) in an active UL BWP, wherein one of the initial UL BWP and the additional UL BWP is activated as the active UL BWP, the PUSCH is scheduled by using the RAR UL grant, a first field included in the RAR UL grant is used to indicate frequency resource allocation of the PUSCH, and whether the first field is to be truncated or whether a bit is to be inserted into the first field is determined based on a bandwidth of the initial UL BWP.