5G Msg3 Uplink Allocation with Consistent UL BWP Rules
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Solution Overview
Problem
In the 5G mobile communication system, the base station and terminal may understand the UL BWP differently during the Contention-Based Random Access (CBRA) process, leading to errors in the transmission and reception of msg3 due to the lack of a definite scheme for resource allocation.
Innovation Solution
A predefined rule is used by the base station and terminal to determine resource allocation information for msg3, ensuring consistent understanding and preventing errors by aligning the resource allocation scheme in the CBRA process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base station configures different UL BWPs for different terminals in 5G system, then the adaptability and resource utilization are improved, but the terminal and base station may understand the UL BWP differently leading to errors in msg3 transmission
Solution Approach 1:
The base station performs preliminary action by configuring the terminal with the BWP identifier and frequency domain resource allocation information before the random access procedure. This ensures that both the base station and terminal have consistent understanding of the UL BWP to be used for msg3 transmission, preventing misalignment errors while maintaining the flexibility of different BWP configurations for different terminals.
Solution Approach 2:
The BWP identifier acts as an intermediary that bridges the base station's BWP configuration and the terminal's resource understanding. By explicitly indicating the BWP identifier in the RAR message, the patent ensures consistent interpretation of the UL BWP for msg3 transmission between base station and terminal, resolving the reliability issue while preserving adaptability.
2Device complexity
If a fixed size resource block allocation indication field is used in UL grant, then the message structure is simplified, but the base station cannot differentiate BWP configurations for different terminals when same preamble is transmitted
Solution Approach 1:
The resource allocation information is segmented into two parts: a fixed size resource block allocation indication field for basic resource specification, and a BWP identifier field for differentiating BWP configurations. This segmentation allows the UL grant to maintain structural simplicity while incorporating additional information needed to distinguish different BWP configurations for terminals transmitting the same preamble.
Solution Approach 2:
The UL grant structure is enhanced to serve multiple functions: the fixed size resource block allocation indication field handles basic resource allocation, while the added BWP identifier field enables BWP configuration differentiation. This multi-functionality allows the same UL grant structure to work across different BWP configurations without increasing overall complexity significantly.
3Measurement precision
If the terminal determines resource allocation based on active UL BWP, then the resource allocation accuracy is improved, but the terminal and base station may have different understanding without a definite scheme
Solution Approach 1:
The base station provides feedback to the terminal by including the BWP identifier and frequency domain resource allocation information in the RAR message. This feedback mechanism ensures that the terminal's resource allocation determination based on active UL BWP aligns with the base station's understanding, maintaining both accuracy and consistency in resource allocation.
Solution Approach 2:
The patent changes the parameter transmission mode by explicitly indicating the BWP identifier and frequency domain resource allocation information from the base station to the terminal through the RAR message. This parameter change ensures that the terminal uses the correct BWP configuration for resource allocation, achieving both high accuracy and consistency between base station and terminal understanding.
Data Source
AI summary
An uplink resource allocation method, an uplink resource allocation device, a base station and a terminal are provided. The uplink resource allocation method includes determining resource allocation information of an msg3 in a CBRA process. The resource allocation information is determined by the base station in accordance with a predefined rule; or the resource allocation information is configured by the base station, and notified by the base station to the terminal. When the resource allocation information is determined in accordance with the predefined rule, a same predefined rule is used by the base station and the terminal.