UL Bandwidth Part Activation for RAR-Scheduled PUSCH Mapping
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink bandwidth parts (BWPs) for efficient communication in fifth-generation cellular systems, particularly in scenarios like enhanced Mobile BroadBand (eMBB), Ultra-Reliable and Low Latency Communication (URLLC), and massive Machine Type Communication (mMTC).
Innovation Solution
A terminal and base station apparatus are designed to dynamically manage initial and additional UL BWPs through RRC messages, utilizing RAR UL grants for scheduling PUSCH, with truncation or bit insertion decisions based on initial UL BWP bandwidth, enhancing communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If additional UL BWP is configured to support wider bandwidth communication, then communication capacity is improved, but device complexity increases
Solution Approach 1:
The uplink bandwidth is divided into multiple bandwidth parts (BWPs), including an initial UL BWP and additional UL BWPs. The terminal can activate only the necessary BWP(s) based on communication requirements, thereby increasing communication capacity when needed while maintaining lower complexity when using only the initial BWP.
Solution Approach 2:
The system dynamically activates or deactivates additional UL BWPs based on communication needs. The terminal receives BWP configuration via RRC messages and can switch between BWPs using indicators in DCI or RAR messages, allowing adaptive adjustment of communication capacity without permanently increasing device complexity.
2Productivity
If BWP activation and deactivation mechanisms are implemented, then communication efficiency is improved, but control signaling overhead increases
Solution Approach 1:
The BWP indicator field in DCI or RAR messages serves multiple functions: it identifies the target BWP for communication and simultaneously triggers activation or deactivation of BWPs. This multi-functionality reduces the need for separate control messages, thereby improving communication efficiency while minimizing signaling overhead.
Solution Approach 2:
The terminal autonomously activates or deactivates BWPs based on received indicators without requiring explicit activation/deactivation commands from the base station. This self-service mechanism reduces control signaling overhead while maintaining efficient BWP management.
3Productivity
If frequency resource allocation is optimized for activated BWP, then resource utilization is improved, but processing complexity increases
Solution Approach 1:
Frequency resource allocation is optimized specifically for the activated BWP rather than the entire uplink bandwidth. The terminal applies resource allocation rules and truncation/bit insertion operations only within the scope of the active BWP, improving resource utilization while limiting processing complexity to the necessary local area.
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.