BWP Switching for 2-Step RACH PUSCH Overhead Reduction
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Solution Overview
Problem
The 2-step random access procedure in next-generation wireless communication systems requires enhancement to improve efficiency, particularly in reducing physical uplink shared channel (PUSCH) resource overhead and optimizing bandwidth part (BWP) switching.
Innovation Solution
The proposed solution involves configuring PUSCH resources with and without cyclic prefix (CP) and guard time (GT) for 2-step random access configurations, allowing for UL timing or DL timing-based PUSCH transmission based on specific conditions, and dynamically switching between UL BWP configurations to support 2-step or 4-step RACH procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUSCH resources are configured with cyclic prefix and guard time for 2-step RACH, then the random access procedure can be supported, but PUSCH resource overhead increases
Solution Approach 1:
The patent implements dynamic BWP switching based on RACH configuration. When 2-step RACH is configured, the terminal switches to a first BWP that has PUSCH resources configured with cyclic prefix and guard time. When 2-step RACH is not configured, the terminal uses a second BWP with different PUSCH resource configurations. This dynamic adaptation allows the system to only allocate additional PUSCH resources when actually needed for 2-step RACH operations, thereby resolving the contradiction between supporting 2-step RACH and minimizing resource overhead.
2Productivity
If BWP switching is implemented to support 2-step RACH, then resource allocation efficiency improves, but system complexity increases
Solution Approach 1:
The patent pre-configures multiple BWPs with different PUSCH resource characteristics before the terminal needs to perform random access. The first BWP is pre-configured with PUSCH resources including cyclic prefix and guard time for 2-step RACH, while the second BWP is configured for other purposes. When 2-step RACH needs to be performed, the terminal simply switches to the pre-configured first BWP, avoiding the need for complex real-time resource allocation decisions and reducing system complexity while maintaining high resource allocation efficiency.
3Reliability
If PUSCH resources are allocated for 2-step RACH in active UL BWP, then random access capability is ensured, but resource flexibility is reduced
Solution Approach 1:
The patent segments the uplink bandwidth into multiple BWPs with different functionalities. The first BWP is dedicated to 2-step RACH operations with specifically configured PUSCH resources, while the second BWP remains flexible for other uplink transmissions. This segmentation allows the system to ensure reliable random access capability in the first BWP while maintaining resource flexibility in the second BWP, effectively resolving the contradiction between reliability and adaptability.
Data Source
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AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides method and apparatus for BWP switching and PUSCH resource overhead reducing for 2 step RACH.