Active BWP Switching with Multi-Unit Channel Access
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Solution Overview
Problem
In wireless communication systems, there is an ambiguity between base stations and terminals regarding the active bandwidth part (BWP) when the terminal fails to receive BWP switching indications or experiences channel access procedure (CAP) failures during uplink transmission, leading to inefficiencies in signal transmission and reception.
Innovation Solution
The method involves switching an active BWP based on BWP switching indication information and performing uplink transmission in the switched active BWP, where the BWP includes multiple frequency units for channel access, with transmission occurring on resources determined by the success of the CAP in all or part of these units, and using a configured grant when the CAP is unsuccessful.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal performs channel access procedure (CAP) in multiple frequency units to enable flexible uplink transmission, then the adaptability and transmission flexibility are improved, but the complexity of channel access management and resource determination increases
Solution Approach 1:
The bandwidth part is divided into multiple frequency units (N frequency units), allowing the terminal to perform channel access procedures independently in each unit. This segmentation enables flexible selection of available frequency units for uplink transmission while simplifying the management of channel access by treating each unit as an independent resource pool.
Solution Approach 2:
The terminal performs channel access procedures in all N frequency units but only utilizes the subset where CAP succeeds. This partial action approach ensures maximum transmission flexibility by attempting access in all units while actually transmitting only in successful units, balancing comprehensiveness with practical resource utilization.
2Productivity
If the terminal switches active BWP based on BWP switching indication information to improve spectral efficiency, then the resource utilization is improved, but the risk of ambiguity between base station and terminal regarding active BWP increases
Solution Approach 1:
The terminal performs channel access procedures and determines transmission resources in advance within the switched active BWP before actual uplink transmission. This preliminary action ensures that both base station and terminal have consistent understanding of the active BWP state and available resources, eliminating ambiguity while maintaining spectral efficiency benefits.
Solution Approach 2:
The terminal determines uplink transmission resources based on the results of channel access procedures performed in the active BWP. This feedback mechanism ensures that resource allocation decisions are made based on actual channel access success, providing implicit confirmation of the active BWP state to both base station and terminal, thereby maintaining synchronization.
3Reliability
If the terminal performs uplink transmission based on CAP results in all or part of N frequency units to improve transmission reliability, then the transmission success rate is improved, but the complexity of resource determination increases
Solution Approach 1:
The uplink transmission resources are segmented according to the results of channel access procedures in each frequency unit. The terminal determines transmission resources by identifying which frequency units achieved CAP success, creating a simplified resource determination process based on clear segmentation of successful versus unsuccessful access units.
Solution Approach 2:
Different transmission resources are allocated based on local CAP results in different frequency units. Frequency units where CAP succeeded receive transmission resources, while those where CAP failed do not. This local quality approach simplifies resource determination by applying clear local rules rather than complex global optimization.
Data Source
AI summary
The present invention relates to a wireless communication system, more specifically to a method and an apparatus therefor, the method comprising switching an active bandwidth part (BWP) on the basis of BWP switching indication information, and transmitting an uplink on the basis of the results of a channel access procedure (CAP) in the switched active BWP, wherein the active BWP comprises N number of frequency units in which the CAP is carried out, N being an integer two or greater, and the uplink is transmitted in a resource determined on the basis of whether the CAP is successful in all or a part of the N number of unit frequencies.